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PSYCH 143: Cardiovascular Disorders · Clinical Deep Dives

• 0:00
  SPEAKER_00: I mean, usually when we talk about a medical diagnosis,
• 0:02
  SPEAKER_00: there is this expectation of, you know, mechanical precision.
• 0:06
  SPEAKER_00: Like, you break your arm,
• 0:08
  SPEAKER_00: the x-ray shows that jagged white line of the radius bone,
• 0:11
  SPEAKER_00: and the clinician just points to the screen.
• 0:13
  SPEAKER_00: It is visible, it is categorized, and frankly, it is comforting.
• 0:17
  SPEAKER_01: Yeah, gives you something tangible to work with.
• 0:19
  SPEAKER_00: Exactly.
• 0:20
  SPEAKER_00: But step into the realm of psychiatry,
• 0:22
  SPEAKER_00: so neurodevelopment,
• 0:24
  SPEAKER_00: affective disorders, trauma, and that x-ray machine just shatters.
• 0:29
  SPEAKER_00: We find ourselves in a diagnostic landscape that is entirely invisible to
• 0:33
  SPEAKER_00: a standard imaging suite.
• 0:35
  SPEAKER_00: We are looking at the study of how brain,
• 0:38
  SPEAKER_00: mind and experience interact and really how
• 0:41
  SPEAKER_00: that incredibly delicate process can go wrong.
• 0:43
  SPEAKER_01: Which is a brilliant way to frame it because today we're taking
• 0:45
  SPEAKER_01: that exact psychiatric philosophy and applying it to the most critical piece
• 0:48
  SPEAKER_01: of machinery in the human body.
• 0:50
  SPEAKER_00: Right.
• 0:51
  SPEAKER_00: We are unpacking chapter 27.2 of Kaplan and Sadok Comprehensive Textbook of Psychiatry.
• 0:56
  SPEAKER_00: So this deep dive is all about looking at cardiovascular disorders entirely through
• 1:01
  SPEAKER_00: the lens of psychiatry.
• 1:02
  SPEAKER_01: And when we apply that lens, the dichotomy between the mind and the body completely dissolves.
• 1:08
  SPEAKER_01: I mean, the cardiovascular system is the perfect canvas for this
• 1:11
  SPEAKER_01: because it is entirely reactive.
• 1:13
  SPEAKER_01: It is constantly adjusting to the psychological state of the organism.
• 1:17
  SPEAKER_00: I want to build a visual for you, the listener, to carry through this entire discussion.
• 1:22
  SPEAKER_00: Think of the heart as the engine room of the body.
• 1:25
  SPEAKER_00: So you have this enormous rhythmic mechanical pump.
• 1:28
  SPEAKER_00: You have the plunning, which are the coronary arteries supplying the fuel.
• 1:32
  SPEAKER_00: You have the valves keeping the flow unidirectional.
• 1:34
  SPEAKER_00: And you have the electrical grid dictating the rhythm.
• 1:37
  SPEAKER_01: But this engine room is not isolated in the hull of a ship.
• 1:40
  SPEAKER_01: It is wired directly into the control room of
• 1:43
  SPEAKER_01: the brain via these really thick neural cables carrying autonomic signals.
• 1:47
  SPEAKER_00: Yeah, and it is flooded with chemical messengers,
• 1:50
  SPEAKER_00: stress hormones,
• 1:51
  SPEAKER_00: psychotropic medications, and it is entirely captive to our behavioral outputs.
• 1:56
  SPEAKER_01: Spot on.
• 1:57
  SPEAKER_01: Historically, literature and poetry treat the heart as a metaphor for emotion.
• 2:02
  SPEAKER_01: But clinically and biologically, it is a target organ.
• 2:06
  SPEAKER_01: The relationship we are dissecting today is strikingly bidirectional.
• 2:10
  SPEAKER_01: Cardiovascular disease produces profound psychiatric symptoms.
• 2:14
  SPEAKER_01: So anxiety, severe depression, cognitive disturbance, trauma.
• 2:18
  SPEAKER_00: And conversely,
• 2:19
  SPEAKER_00: psychiatric illness fundamentally alters the physical structure,
• 2:22
  SPEAKER_00: the plumbing,
• 2:23
  SPEAKER_00: and the electrical rhythm of that engine,
• 2:25
  SPEAKER_00: which means whether you are a psychiatry trainee,
• 2:28
  SPEAKER_00: a seasoned clinician,
• 2:29
  SPEAKER_00: or a medical student,
• 2:30
  SPEAKER_00: you just cannot practice psychiatry without managing the heart.
• 2:33
  SPEAKER_01: Right.
• 2:33
  SPEAKER_01: And cardiologists cannot treat the heart without managing the mind.
• 2:37
  SPEAKER_01: Coronary artery disease is a leading cause of worldwide disability.
• 2:40
  SPEAKER_01: So the comorbidity here poses a massive treatment challenge.
• 2:43
  SPEAKER_00: Because intervening psychiatrically in these patients actually alters
• 2:46
  SPEAKER_00: the physical trajectory of the cardiac disease.
• 2:49
  SPEAKER_00: So let's start with the plumbing.
• 2:50
  SPEAKER_00: We need to map the landscape of coronary artery disease, or CAD.
• 2:54
  SPEAKER_00: Physiologically, this is a progressive process driven by atherosclerosis.
• 2:58
  SPEAKER_01: Exactly, plaque formation in the coronary arteries.
• 3:01
  SPEAKER_01: And these are the specific vessels supplying oxygen to the myocardial cells.
• 3:05
  SPEAKER_01: The acute life-threatening events,
• 3:08
  SPEAKER_01: you know,
• 3:08
  SPEAKER_01: the acute coronary syndromes like unstable angina or a myocardial infarction,
• 3:14
  SPEAKER_01: they happen when a thrombus forms on the surface of a disrupted plaque.
• 3:18
  SPEAKER_00: So the pipe is occluded,
• 3:19
  SPEAKER_00: the myocardial cells are starved of oxygen,
• 3:21
  SPEAKER_00: and that ischemia leads to rapid cell death.
• 3:25
  SPEAKER_00: We all know the classic physical risk factors, hypertension, hyperlipidemia, diabetes, smoking.
• 3:31
  SPEAKER_01: Yeah, and we know premenopausal women have a reduced risk due to estrogen,
• 3:35
  SPEAKER_01: which we will definitely dig into later.
• 3:36
  SPEAKER_01: But after menopause, their incidence matches men.
• 3:39
  SPEAKER_00: But behavioral and psychological factors are increasingly recognized as driving
• 3:43
  SPEAKER_00: the actual incident risk, so the development of the disease in the first place.
• 3:46
  SPEAKER_00: The textbook specifically isolates depression here.
• 3:49
  SPEAKER_00: It doesn't just worsen existing CAD, it actually initiates it.
• 3:52
  SPEAKER_01: The prospective epidemiologic data is overwhelming on this.
• 3:56
  SPEAKER_01: Depression strongly predicts an increased relative risk of a first,
• 4:00
  SPEAKER_01: MI, and cardiac-related mortality.
• 4:03
  SPEAKER_01: And the immediate assumption many clinicians make is that this is purely
• 4:06
  SPEAKER_01: a behavioral consequence.
• 4:08
  SPEAKER_00: Right, because depressed patients exhibit higher rates of social isolation,
• 4:12
  SPEAKER_00: profound physical inactivity, poor adherence to statins or antihypertensives.
• 4:17
  SPEAKER_01: Yeah, and a significantly higher lifetime risk of smoking with much lower successful quit rates.
• 4:22
  SPEAKER_00: But I really have to challenge that assumption,
• 4:24
  SPEAKER_00: because if it's just behavior,
• 4:26
  SPEAKER_00: then the depression itself isn't damaging the heart the cigarettes are.
• 4:29
  SPEAKER_00: If we take a population and adjust the statistics to completely control for smoking,
• 4:33
  SPEAKER_00: so we remove it from the equation entirely,
• 4:36
  SPEAKER_00: does the depression itself still break the heart on a cellular level?
• 4:39
  SPEAKER_01: It absolutely does.
• 4:40
  SPEAKER_01: I mean, even after controlling for smoking,
• 4:42
  SPEAKER_01: which is a potent vascular toxin,
• 4:45
  SPEAKER_01: depression independently almost doubles the risk of developing CAD.
• 4:49
  SPEAKER_01: We are looking at a direct biological pathway here.
• 4:52
  SPEAKER_00: Which is primarily mediated through abnormal neuroendocrine function,
• 4:55
  SPEAKER_00: autonomic dysregulation, and severe platelet dysfunction, right?
• 4:58
  SPEAKER_01: Exactly.
• 5:00
  SPEAKER_01: Let's just look at the hypothalamic-pituitary-adrenal axis, the HTA axis.
• 5:06
  SPEAKER_01: In a healthy system, cortisol follows a diurnal variation.
• 5:10
  SPEAKER_01: It peaks in the morning to wake you up and steadily declines so you can sleep.
• 5:13
  SPEAKER_00: But in severe depression, that axis loses its feedback loop.
• 5:17
  SPEAKER_00: The system is just bathed in a constant high tide level of cortisol.
• 5:21
  SPEAKER_00: The diurnal variation is completely flattened.
• 5:24
  SPEAKER_01: And that chronic cortisol elevation is highly toxic to the coronary artery endothelium.
• 5:29
  SPEAKER_00: Which is wild because we usually think of the endothelium as just
• 5:32
  SPEAKER_00: a passive Teflon coating on the inside of the blood vessel.
• 5:34
  SPEAKER_01: But it isn't.
• 5:35
  SPEAKER_01: It is a highly active endocrine organ.
• 5:38
  SPEAKER_01: It secretes nitric oxide to keep the vessels dilated and smooth.
• 5:41
  SPEAKER_01: Cortisol impairs that nitric oxide synthase.
• 5:45
  SPEAKER_01: It heavily promotes oxidative stress.
• 5:47
  SPEAKER_00: So the cortisol is actively changing the biochemistry of the vessel wall.
• 5:50
  SPEAKER_00: It allows LDL cholesterol to oxidize,
• 5:53
  SPEAKER_00: which then triggers the macrophages to come in,
• 5:55
  SPEAKER_00: engorge themselves,
• 5:56
  SPEAKER_00: and turn into the foam cells that literally build the atherosclerotic plaque.
• 5:59
  SPEAKER_01: Right.
• 5:59
  SPEAKER_01: So the depression is literally laying down the plaque.
• 6:02
  SPEAKER_01: But it goes deeper than that.
• 6:04
  SPEAKER_01: We also have to look at the hematology.
• 6:06
  SPEAKER_00: Because platelets are responsible for clotting.
• 6:08
  SPEAKER_00: And disordered platelet aggregation is the trigger for the thrombus that causes the actual MI.
• 6:14
  SPEAKER_01: Spot on.
• 6:15
  SPEAKER_01: Depressed patients exhibit significantly greater baseline prothrombotic activity.
• 6:20
  SPEAKER_01: Their platelets are fundamentally hyperreactive.
• 6:23
  SPEAKER_00: Wait, how does a mood disorder make blood cells stickier?
• 6:26
  SPEAKER_00: I mean, platelets don't have brains, they don't know the patient is sad.
• 6:29
  SPEAKER_01: They don't have brains, no,
• 6:30
  SPEAKER_01: but they do have serotonin reuptake transporters,
• 6:33
  SPEAKER_01: or SERT, on their cell membranes, exactly like neurons do.
• 6:37
  SPEAKER_01: Platelets actually store serotonin.
• 6:39
  SPEAKER_00: Oh, wow.
• 6:40
  SPEAKER_01: Yeah, and when they're activated,
• 6:42
  SPEAKER_01: they release that serotonin,
• 6:43
  SPEAKER_01: which acts as a powerful amplifier for further platelet aggregation
• 6:46
  SPEAKER_01: and vasoconstriction.
• 6:48
  SPEAKER_00: So in depression,
• 6:49
  SPEAKER_00: the altered serotonergic signaling in the brain is mirrored
• 6:52
  SPEAKER_00: by altered serotonergic dynamics in the platelets.
• 6:55
  SPEAKER_01: Exactly.
• 6:56
  SPEAKER_01: They become hyper-responsive to orthostatic challenges like simply standing up.
• 6:59
  SPEAKER_00: That is a brilliant piece of biological synthesis.
• 7:02
  SPEAKER_00: The altered serotonin in the synaptic cleft that drives the low mood is
• 7:06
  SPEAKER_00: the exact same altered serotonin dynamic,
• 7:09
  SPEAKER_00: making the blood ready to clot over a plaque.
• 7:11
  SPEAKER_01: And the clinical proof of this is that
• 7:13
  SPEAKER_01: when we prescribe serotonergic antidepressants,
• 7:17
  SPEAKER_01: so SSRIs with a high affinity for that transporter,
• 7:20
  SPEAKER_01: we actually reduce platelet activation.
• 7:23
  SPEAKER_01: We deplete the platelets of serotonin.
• 7:25
  SPEAKER_00: Which is why SSRIs carry a mild bleeding risk.
• 7:28
  SPEAKER_00: But it is also why several studies indicate they actively reduce the likelihood of a first MI.
• 7:34
  SPEAKER_00: We are fundamentally altering the hematology by treating the psychiatric illness.
• 7:38
  SPEAKER_01: The prognostic impact of this bidirectional highway is terrifying, honestly.
• 7:43
  SPEAKER_01: The textbook notes a widely replicated dose-response relationship.
• 7:46
  SPEAKER_00: Right.
• 7:47
  SPEAKER_00: If a patient suffers an acute MI
• 7:49
  SPEAKER_00: and they subsequently develop severe depressive symptoms,
• 7:51
  SPEAKER_00: that depression directly predicts their five-year mortality,
• 7:54
  SPEAKER_00: independent of their physiological cardiac limits.
• 7:57
  SPEAKER_01: That is the compounding tragedy of this comorbidity.
• 8:00
  SPEAKER_01: Severe depression predicts a reduced perceived quality of life
• 8:03
  SPEAKER_01: and diminished physical functioning even more strongly than
• 8:06
  SPEAKER_01: a reduced ejection fraction.
• 8:08
  SPEAKER_00: Let me make sure you, the listener, grasp the gravity of that.
• 8:11
  SPEAKER_00: The actual mechanical measurement of how much blood the left ventricle can pump out
• 8:15
  SPEAKER_00: with each contraction,
• 8:17
  SPEAKER_00: the ejection fraction,
• 8:18
  SPEAKER_00: matters less to the patient's physical functioning than the severity
• 8:22
  SPEAKER_00: of their mood disorder.
• 8:23
  SPEAKER_01: The clinical data confirms it.
• 8:25
  SPEAKER_01: Depression is associated with increased death at 5 and 10 years following
• 8:29
  SPEAKER_01: a coronary artery bypass graft.
• 8:32
  SPEAKER_01: A poor response to an antidepressant post-MI is a massive red flag
• 8:36
  SPEAKER_01: for subsequent cardiac events.
• 8:38
  SPEAKER_00: So if chronic depression is laying down the plaque and making the blood sticky,
• 8:42
  SPEAKER_00: what happens when we introduce acute emotion?
• 8:44
  SPEAKER_00: Let's move away from chronic low mood and look at
• 8:47
  SPEAKER_00: the sympathetic nervous system reacting to acute stress, anxiety, or trauma.
• 8:52
  SPEAKER_01: Well, anxiety disorders are incredibly prevalent in the CAD population.
• 8:56
  SPEAKER_01: The 12-month prevalence of any anxiety disorder in CAD patients sits at over 10%
• 9:00
  SPEAKER_01: in men and approaches 25% in women.
• 9:03
  SPEAKER_00: And panic disorder specifically is strongly associated with CAD progression.
• 9:07
  SPEAKER_01: Yeah.
• 9:08
  SPEAKER_01: And while anxiety and depression often co-occur,
• 9:10
  SPEAKER_01: making them difficult to fully isolate,
• 9:12
  SPEAKER_01: the physiological response to acute mental stress is highly distinct.
• 9:17
  SPEAKER_00: When someone gets intensely angry or terrified,
• 9:20
  SPEAKER_00: the healthy biological response is for the coronary arteries to vasodilate.
• 9:24
  SPEAKER_00: The engine needs more oxygen to fight or flee, so the pipes widen.
• 9:28
  SPEAKER_01: But an atherosclerotic artery is structurally compromised.
• 9:31
  SPEAKER_01: It is stiffened by that plaque we just discussed.
• 9:34
  SPEAKER_01: When a CAD patient experiences acute mental stress,
• 9:37
  SPEAKER_01: the laboratory
• 9:38
  SPEAKER_01: and ambulatory monitoring shows something called paradoxical vasoconstriction.
• 9:42
  SPEAKER_00: So instead of the pipe widening, the stress actually clamps it down.
• 9:46
  SPEAKER_00: It's like stepping on a garden hose that's already clogged with mud.
• 9:49
  SPEAKER_01: That is a perfect analogy.
• 9:51
  SPEAKER_01: The sudden surge of catecholamines hits the compromised endothelium.
• 9:54
  SPEAKER_01: And because that endothelium can't produce enough nitric oxide to dilate,
• 9:58
  SPEAKER_01: the smooth muscle underneath simply spasms.
• 10:01
  SPEAKER_00: The emotion provokes a coronary spasm that reduces blood flow through
• 10:04
  SPEAKER_00: the already narrowed segment.
• 10:06
  SPEAKER_00: This causes abnormal left ventricular wall motion and clear ECG evidence
• 10:11
  SPEAKER_00: of mitocardial ischemia.
• 10:12
  SPEAKER_01: And this mental stress-induced ischemia occurs even in patients who can pass
• 10:17
  SPEAKER_01: a physical treadmill stress test without showing ischemia.
• 10:21
  SPEAKER_00: Wait, really?
• 10:21
  SPEAKER_00: You could literally pass a cardiology stress test in the morning,
• 10:24
  SPEAKER_00: get into a screaming match in traffic on the way home,
• 10:27
  SPEAKER_00: and that acute anger cuts off the blood supply to your myocardium.
• 10:31
  SPEAKER_01: Exactly that.
• 10:32
  SPEAKER_01: The InterHeart study,
• 10:33
  SPEAKER_01: which is the largest case control study of MI predictors,
• 10:37
  SPEAKER_01: found that psychosocial factors,
• 10:39
  SPEAKER_01: so a combination of stress and depression,
• 10:41
  SPEAKER_01: ranked as the third highest predictor of a heart attack globally.
• 10:45
  SPEAKER_00: It raises the risk to levels comparable to smoking or diabetes,
• 10:49
  SPEAKER_00: unemployment, involuntary job loss, daily interpersonal stress.
• 10:54
  SPEAKER_00: These are associated with a nearly twofold increase in rates of stroke, MI, and heart failure.
• 10:59
  SPEAKER_01: Which naturally brings up the concept of personality profiling.
• 11:02
  SPEAKER_01: In the 70s and 80s, psychosomatic cardiology was quite obsessed with the type A personality.
• 11:07
  SPEAKER_00: Right, the hyper-competitive,
• 11:08
  SPEAKER_00: hostile executive who was always looking at his watch and yelling
• 11:11
  SPEAKER_00: at his subordinates.
• 11:12
  SPEAKER_00: We were told that guy was absolutely destined for a heart attack.
• 11:16
  SPEAKER_01: Well, hostility does provoke surges in catecholamines and transient lipid elevations.
• 11:21
  SPEAKER_01: But the rigorous long-term data linking the classic type A personality directly
• 11:26
  SPEAKER_01: to CAD progression eventually produced mixed results.
• 11:30
  SPEAKER_01: The literature required a much more nuanced psychological profile.
• 11:33
  SPEAKER_00: And the textbook points to the shift toward the type D personality.
• 11:37
  SPEAKER_01: Yes, type D or the distressed personality.
• 11:39
  SPEAKER_01: It is defined by the intersection of two distinct traits.
• 11:42
  SPEAKER_01: First is negative affectivity,
• 11:44
  SPEAKER_01: which is the tendency to frequently experience negative emotions like sadness,
• 11:48
  SPEAKER_01: worry, and irritability.
• 11:50
  SPEAKER_00: And the second trait?
• 11:51
  SPEAKER_01: The second is social inhibition,
• 11:52
  SPEAKER_01: which is the conscious suppression of expressing those negative emotions
• 11:56
  SPEAKER_01: to avoid disapproval or rejection from others.
• 11:59
  SPEAKER_00: So it isn't the executive screaming at the waiter.
• 12:01
  SPEAKER_00: It is the person who is profoundly distressed but swallows all of it to maintain
• 12:06
  SPEAKER_00: a socially acceptable facade.
• 12:08
  SPEAKER_00: The internal physiological cost of that suppression is massive.
• 12:11
  SPEAKER_01: The contemporary literature steadily replicates that
• 12:14
  SPEAKER_01: the type D personality is associated with a substantially increased risk
• 12:18
  SPEAKER_01: of adverse cardiac events in patients who already have CAD.
• 12:21
  SPEAKER_00: Because the chronic internalization of stress maintains that high sympathetic tone
• 12:26
  SPEAKER_00: and HPA axis dysregulation without any behavioral release.
• 12:30
  SPEAKER_01: Precisely.
• 12:31
  SPEAKER_01: We also need to factor trauma into this acute stress model,
• 12:34
  SPEAKER_01: specifically post-traumatic stress disorder.
• 12:36
  SPEAKER_00: Right.
• 12:37
  SPEAKER_00: The data on military combat veterans with PTSD demonstrates
• 12:40
  SPEAKER_00: a severe independent increased risk of developing CAD,
• 12:44
  SPEAKER_00: heart failure, and cerebrovascular disease.
• 12:47
  SPEAKER_01: But the relationship in civilian cardiology is a brutal feedback loop because
• 12:51
  SPEAKER_01: the cardiac disease itself can act as the trauma.
• 12:54
  SPEAKER_00: I mean, a myocardial infarction is a literal brush with death.
• 12:57
  SPEAKER_00: But unlike a car crash or an assault, the threat comes from inside your own body.
• 13:01
  SPEAKER_00: You just can't escape it.
• 13:03
  SPEAKER_01: Which fundamentally alters the psychological processing of the event.
• 13:06
  SPEAKER_01: Cardiac disease and medical interventions like waking up intubated in an ICU
• 13:10
  SPEAKER_01: or experiencing a painful defibrillator shock-induced PTSD at
• 13:14
  SPEAKER_01: an average prevalence rate of 12%.
• 13:16
  SPEAKER_00: And those trauma symptoms,
• 13:17
  SPEAKER_00: the hyperarousal,
• 13:18
  SPEAKER_00: the intrusive memories,
• 13:19
  SPEAKER_00: they drive further autonomic dysfunction,
• 13:22
  SPEAKER_00: creating a self-perpetuating cycle of cardiovascular damage.
• 13:25
  SPEAKER_01: It is incredibly tough to break that cycle.
• 13:27
  SPEAKER_00: So if mild internalized stress and the trauma of
• 13:31
  SPEAKER_00: a cardiac event can do this much damage to the engine room,
• 13:34
  SPEAKER_00: what happens when the control room is suffering from severe chronic pathology?
• 13:39
  SPEAKER_00: We need to transition to severe mental illness or SMI.
• 13:42
  SPEAKER_01: Yeah.
• 13:43
  SPEAKER_01: We're talking about schizophrenia, schizoaffective disorder, and bipolar disorder.
• 13:48
  SPEAKER_01: And the mortality statistics for SMI represent one of
• 13:51
  SPEAKER_01: the most glaring health inequalities in modern medicine.
• 13:54
  SPEAKER_00: Individuals with severe mental illness have a life expectancy that is,
• 13:57
  SPEAKER_00: on average, 10 to 17.5 years shorter than the general population.
• 14:02
  SPEAKER_01: A decade or more of life.
• 14:03
  SPEAKER_01: Gone.
• 14:04
  SPEAKER_01: And the instinct is to attribute that gap to suicide or accidental death,
• 14:08
  SPEAKER_01: given the severity of the psychiatric symptoms.
• 14:10
  SPEAKER_00: Unnatural causes are elevated, sure, but they do not drive the mortality gap.
• 14:15
  SPEAKER_00: Coronary artery disease is the leading cause of death in those with SMI,
• 14:18
  SPEAKER_00: accounting for up to 25% of all mortality.
• 14:21
  SPEAKER_00: The CAD simply occurs much earlier and progresses much faster.
• 14:25
  SPEAKER_01: The etiology here is an overlapping web of parallel dysfunction.
• 14:29
  SPEAKER_01: The disease itself,
• 14:30
  SPEAKER_01: the behaviors it creates,
• 14:31
  SPEAKER_01: and the treatments we prescribe all converge on the cardiovascular system.
• 14:35
  SPEAKER_00: Let's start with the treatments.
• 14:36
  SPEAKER_00: The atypical antipsychotics are revolutionary for psychosis, but they are metabolically brutal.
• 14:42
  SPEAKER_01: They are.
• 14:43
  SPEAKER_01: They profoundly disrupt glucose and lipid metabolism.
• 14:47
  SPEAKER_01: They induce rapid weight gain,
• 14:48
  SPEAKER_01: leading directly to metabolic syndrome,
• 14:51
  SPEAKER_01: the clustering of hypertension,
• 14:52
  SPEAKER_01: hyperlipidemia, increased abdominal adiposity, and insulin resistance.
• 14:57
  SPEAKER_00: And the mechanism involves antagonism at histamine H1
• 15:00
  SPEAKER_00: and serotonin 5-HT2C receptors, which just destroy satiety signaling, right?
• 15:05
  SPEAKER_01: That's a huge part of it.
• 15:07
  SPEAKER_01: But there are also direct peripheral effects on insulin sensitivity in
• 15:10
  SPEAKER_01: the skeletal muscle and adipocytes.
• 15:12
  SPEAKER_00: So the clinical reasoning for psychiatrists is dictated by the hierarchy of risk
• 15:16
  SPEAKER_00: among these agents.
• 15:17
  SPEAKER_00: Clozapine and olanzapine carry the absolute highest cardiometabolic risk.
• 15:21
  SPEAKER_01: And on the far end of the spectrum,
• 15:23
  SPEAKER_01: aripiprazole, suprasadone, and loracidone carry the lowest risk.
• 15:27
  SPEAKER_01: Mood stabilizers like lithium and valproic acid also contribute heavily to weight gain.
• 15:31
  SPEAKER_00: We are administering interventions that inherently stress the endothelium and
• 15:34
  SPEAKER_00: the HPA axis, but the behavioral factors compound this exponentially.
• 15:38
  SPEAKER_01: Right, because negative symptoms in schizophrenia,
• 15:41
  SPEAKER_01: the profound abolition and apathy, lead to severe physical inactivity.
• 15:45
  SPEAKER_01: The engine is never exercised.
• 15:47
  SPEAKER_00: And during manic episodes in bipolar disorder,
• 15:50
  SPEAKER_00: impulsivity drives substance use, creating acute toxic insults to the myocardium.
• 15:55
  SPEAKER_01: But towering above all the behavioral factors is tobacco.
• 15:59
  SPEAKER_01: Smoking is overwhelmingly prevalent in the SMI population.
• 16:02
  SPEAKER_00: The systemic inflammation and vascular damage are severe,
• 16:05
  SPEAKER_00: obviously,
• 16:06
  SPEAKER_00: but the pharmacological interaction with the antipsychotics is
• 16:09
  SPEAKER_00: where clinicians frequently get trapped.
• 16:10
  SPEAKER_01: Yes.
• 16:11
  SPEAKER_01: The interaction occurs in the liver, specifically at the cytochrome P450-1A2 enzyme.
• 16:17
  SPEAKER_01: Tobacco smoke contains polycyclic aromatic hydrocarbons.
• 16:21
  SPEAKER_01: These hydrocarbons are potent inducers of CYP1A2.
• 16:25
  SPEAKER_00: They signal the liver to ramp up production of this enzyme,
• 16:28
  SPEAKER_00: and CYP1A2 is the exact enzyme responsible for metabolizing clozapine
• 16:33
  SPEAKER_00: and olanzapine.
• 16:33
  SPEAKER_01: Which means a patient smoking two packs a day is metabolizing their antipsychotic at
• 16:38
  SPEAKER_01: an incredibly accelerated rate.
• 16:39
  SPEAKER_01: Their blood levels of the drug are artificially lowered by the smoke.
• 16:42
  SPEAKER_00: So if that patient is admitted to a smoke-free psychiatric unit,
• 16:46
  SPEAKER_00: Or simply decides to quit smoking abruptly,
• 16:49
  SPEAKER_00: the polycyclic aromatic hydrocarbons disappear.
• 16:52
  SPEAKER_00: The CYP1A2 enzyme activity plummets back to baseline.
• 16:56
  SPEAKER_01: But the dose of clozapine hasn't changed.
• 16:58
  SPEAKER_01: So the drug accumulates massively in the bloodstream,
• 17:01
  SPEAKER_01: and the patient crosses the threshold into severe toxicity.
• 17:05
  SPEAKER_01: Seizures, profound sedation, hypotension.
• 17:08
  SPEAKER_00: That is terrifying.
• 17:10
  SPEAKER_00: So smoking cessation in SMI cannot be handled casually.
• 17:14
  SPEAKER_00: It isn't just about offering a nicotine patch.
• 17:16
  SPEAKER_01: Which notably provides nicotine but not the hydrocarbons so the patch doesn't induce
• 17:20
  SPEAKER_01: the enzyme at all.
• 17:21
  SPEAKER_00: Quitting smoking requires vigilant proactive dose reductions of the antipsychotic
• 17:26
  SPEAKER_00: and continuous serum level monitoring.
• 17:28
  SPEAKER_00: Yet if they can quit by age 50 it cuts the mortality risk in half.
• 17:32
  SPEAKER_01: But there is a final, highly disturbing piece to the SMI mortality gap outlined in the text.
• 17:37
  SPEAKER_01: Systemic institutional neglect.
• 17:39
  SPEAKER_00: Right.
• 17:39
  SPEAKER_00: Patients with severe mental illness who experience
• 17:41
  SPEAKER_00: an acute MI are significantly less likely than the general population
• 17:45
  SPEAKER_00: to receive guideline-directed medical therapy.
• 17:48
  SPEAKER_01: They're less likely to be prescribed beta blockers or statins post-MI
• 17:52
  SPEAKER_01: and significantly less likely to receive revascularization procedures like stents
• 17:57
  SPEAKER_01: or bypass surgery.
• 17:58
  SPEAKER_00: The result is an 85% higher risk of death related to CAD complications compared
• 18:03
  SPEAKER_00: to matched general populations.
• 18:07
  SPEAKER_00: The CADE study,
• 18:08
  SPEAKER_00: the Clinical Antipsychotic Trials of Intervention Effectiveness,
• 18:11
  SPEAKER_00: exposed the sheer scale of this untreated medical illness.
• 18:15
  SPEAKER_01: The numbers are shocking.
• 18:17
  SPEAKER_01: They found that 88% of schizophrenia patients
• 18:20
  SPEAKER_01: with hyperlipidemia were receiving absolutely no treatment for it.
• 18:24
  SPEAKER_00: 62% of those with hypertension were untreated.
• 18:27
  SPEAKER_00: Thirty percent of those with frank diabetes had no medication.
• 18:30
  SPEAKER_01: The psychiatric community can no longer operate under the assumption that
• 18:33
  SPEAKER_01: a primary care physician is handling the cardiometabolic monitoring.
• 18:37
  SPEAKER_00: Because patients with SMI often lack access to primary care
• 18:41
  SPEAKER_00: or their psychiatric symptoms prevent engagement.
• 18:43
  SPEAKER_01: Exactly.
• 18:44
  SPEAKER_01: The baseline assessments,
• 18:46
  SPEAKER_01: fasting glucose, lipid panels, resting blood pressure, and a baseline ECG.
• 18:52
  SPEAKER_01: These are not administrative checkboxes.
• 18:54
  SPEAKER_01: They are foundational, life-saving psychiatric duties.
• 18:57
  SPEAKER_01: You cannot initiate a drug like olanzapine without taking ownership of
• 19:01
  SPEAKER_01: the metabolic consequences.
• 19:03
  SPEAKER_00: We've established how the mind destroys the plumbing.
• 19:06
  SPEAKER_00: Let us pivot to the pump itself.
• 19:08
  SPEAKER_00: What happens when the plumbing is clear,
• 19:10
  SPEAKER_00: or despite best efforts, the myocardial tissue simply tires out?
• 19:14
  SPEAKER_00: We are looking at heart failure.
• 19:16
  SPEAKER_01: Heart failure is the final common pathway for virtually all forms of heart disease.
• 19:21
  SPEAKER_01: It's a progressive structural or functional impairment where
• 19:23
  SPEAKER_01: the ventricle cannot fill with or eject blood efficiently enough to meet
• 19:27
  SPEAKER_01: the metabolic demands of the body.
• 19:29
  SPEAKER_00: Over 6.2 million adults in the U.S. suffer from it.
• 19:32
  SPEAKER_00: Because the pump is failing, blood backs up.
• 19:34
  SPEAKER_00: If the left ventricle fails, fluid backs up into the lungs, causing dysmolia.
• 19:38
  SPEAKER_01: And if the right ventricle fails,
• 19:40
  SPEAKER_01: fluid backs up into the venous system,
• 19:42
  SPEAKER_01: causing hepatic congestion and massive peripheral edema in the legs.
• 19:46
  SPEAKER_00: These patients are trapped in this precarious balance of fluid management,
• 19:50
  SPEAKER_00: constantly oscillating between being too wet,
• 19:53
  SPEAKER_00: drowning in their own fluid,
• 19:54
  SPEAKER_00: or too dry due to aggressive diuretic therapy, which crashes their kidney function.
• 20:00
  SPEAKER_01: The prognosis is grim, honestly, with approximately a 50% mortality rate at 5 years.
• 20:05
  SPEAKER_00: How does the psychiatric profile interact with a failing pump?
• 20:09
  SPEAKER_01: Well, depression operates as both a precursor and an accelerator.
• 20:13
  SPEAKER_01: Longitudinal studies following patients with isolated hypertension show that those
• 20:17
  SPEAKER_01: with high depressive symptoms carry an almost threefold increased risk
• 20:21
  SPEAKER_01: of progressing to frank heart failure compared to those with low symptoms.
• 20:24
  SPEAKER_00: And once heart failure is established,
• 20:26
  SPEAKER_00: comorbid depression sharply increases hospital readmissions and mortality.
• 20:31
  SPEAKER_00: The diagnostic challenge here is immense, though,
• 20:33
  SPEAKER_00: because the somatic symptoms of heart failure perfectly mimic the somatic symptoms
• 20:37
  SPEAKER_00: of severe depression.
• 20:38
  SPEAKER_01: They overlap almost entirely.
• 20:41
  SPEAKER_01: The hallmark of heart failure is profound fatigue and exercise intolerance,
• 20:45
  SPEAKER_01: dysnoia, and orthopnea.
• 20:48
  SPEAKER_01: So the inability to breathe when lying flat destroy
• 20:51
  SPEAKER_01: the patient's sleep architecture,
• 20:52
  SPEAKER_01: resulting in severe insomnia and daytime exhaustion.
• 20:56
  SPEAKER_00: Right.
• 20:56
  SPEAKER_00: So a patient presenting with anhedonia,
• 20:58
  SPEAKER_00: zero energy,
• 20:59
  SPEAKER_00: psychomotor retardation,
• 21:00
  SPEAKER_00: and insomnia could be experiencing a major depressive episode,
• 21:04
  SPEAKER_00: or they could simply have an ejection fraction of 20%.
• 21:08
  SPEAKER_00: How does a psychiatrist untangle that clinically?
• 21:11
  SPEAKER_01: It is difficult.
• 21:11
  SPEAKER_01: You can't just prescribe an antidepressant to someone whose lungs are filling
• 21:14
  SPEAKER_01: with fluid and expect their energy to improve.
• 21:16
  SPEAKER_01: You have to strip away the somatic symptoms and hunt for the cognitive
• 21:19
  SPEAKER_01: and affective core of depression.
• 21:21
  SPEAKER_00: Hopelessness,
• 21:22
  SPEAKER_00: pervasive worthlessness,
• 21:23
  SPEAKER_00: inappropriate guilt,
• 21:24
  SPEAKER_00: and active suicidal ideation are not physiological byproducts of heart failure.
• 21:29
  SPEAKER_01: Spot on.
• 21:30
  SPEAKER_01: If those cognitive markers are present,
• 21:31
  SPEAKER_01: you are dealing with a comorbid affective illness that requires intervention.
• 21:35
  SPEAKER_00: But the pharmacology changes here.
• 21:37
  SPEAKER_00: With CAD,
• 21:38
  SPEAKER_00: we established that SSRIs like sertraline improve outcomes
• 21:41
  SPEAKER_00: and reduce platelet aggregation.
• 21:43
  SPEAKER_00: Does that hold true for a failing pump?
• 21:45
  SPEAKER_01: Surprisingly, no.
• 21:46
  SPEAKER_01: The data diverges.
• 21:48
  SPEAKER_01: While cognitive behavioral therapy has demonstrated excellent results
• 21:52
  SPEAKER_01: in improving quality of life and reducing depressive burden
• 21:54
  SPEAKER_01: in heart failure patients,
• 21:56
  SPEAKER_01: large-scale trials of antidepressants have not clearly demonstrated
• 22:00
  SPEAKER_01: an improved cardiac prognosis or a mortality benefit in this specific population.
• 22:05
  SPEAKER_00: Interesting.
• 22:06
  SPEAKER_00: So the structural damage to the myocardium might be too advanced for
• 22:09
  SPEAKER_00: the neuroendocrine benefits of an SSRI to reverse the trajectory.
• 22:13
  SPEAKER_01: That is a leading theory, yeah.
• 22:14
  SPEAKER_00: When heart failure becomes entirely refractory to medications and pacemakers,
• 22:19
  SPEAKER_00: the patient is staring down surgical options,
• 22:21
  SPEAKER_00: heart transplants and left ventricular assist devices or LVADs.
• 22:25
  SPEAKER_01: Transplantation is a scarce miracle.
• 22:27
  SPEAKER_01: Only 2,000 to 2,500 patients receive a human heart annually in the U.S.
• 22:32
  SPEAKER_01: It offers a 75% five-year survival rate for patients facing imminent death.
• 22:37
  SPEAKER_00: And because the organs are so rare, the preoperative psychiatric evaluation is intense.
• 22:42
  SPEAKER_00: We are not just screening for illness.
• 22:44
  SPEAKER_00: We are predicting postoperative behavioral compliance.
• 22:47
  SPEAKER_01: Because a patient who cannot adhere to a complex,
• 22:50
  SPEAKER_01: unforgiving medication regimen will rapidly reject the organ.
• 22:54
  SPEAKER_00: And the medications required post-transplant create a pharmacological minefield for
• 22:58
  SPEAKER_00: the psychiatrist.
• 22:59
  SPEAKER_01: Absolutely.
• 22:59
  SPEAKER_01: To prevent the immune system from destroying the new heart,
• 23:02
  SPEAKER_01: the patient must take potent immunosuppressants for the rest of their life.
• 23:06
  SPEAKER_01: Chronic corticosteroids induce mania, psychosis, and severe emotional ability.
• 23:11
  SPEAKER_00: And the calcineurin inhibitors like cyclosporine
• 23:13
  SPEAKER_00: and tacrolimus cause profound anxiety,
• 23:16
  SPEAKER_00: depression,
• 23:17
  SPEAKER_00: insomnia, and neurotoxicity manifesting as tremors or cognitive dysfunction.
• 23:22
  SPEAKER_01: So the anti-rejection drugs make the patient deeply anxious and depressed.
• 23:26
  SPEAKER_01: You are consulted to treat the depression.
• 23:28
  SPEAKER_01: But you can't just throw any SSRI at them because of the liver enzymes.
• 23:31
  SPEAKER_00: The entire system hinges on the cytochrome P450 3A4 isoenzyme.
• 23:37
  SPEAKER_00: CYP3A4 metabolizes the calcineurin inhibitors.
• 23:40
  SPEAKER_01: And these drugs have an incredibly narrow therapeutic index.
• 23:43
  SPEAKER_01: If you prescribe a psychiatric medication that inhibits CYP3A4,
• 23:47
  SPEAKER_01: the tacrolimus isn't metabolized.
• 23:49
  SPEAKER_01: The levels spike and the patient suffers massive nephrotoxicity.
• 23:52
  SPEAKER_01: You literally destroy their kidneys.
• 23:54
  SPEAKER_00: But if you prescribe an inducer of CYP3A4,
• 23:58
  SPEAKER_00: the tacrolimus is chewed up too fast,
• 24:00
  SPEAKER_00: the levels drop, and the immune system attacks and rejects the new heart.
• 24:03
  SPEAKER_01: Exactly.
• 24:04
  SPEAKER_01: It's a terrifying balancing act.
• 24:05
  SPEAKER_00: So what are the actual prescribing rules for a transplant patient?
• 24:08
  SPEAKER_01: Well, SSRIs remain the safest option, but they are not uniform.
• 24:12
  SPEAKER_01: In vitro studies and clinical experience suggest sertraline is the least likely
• 24:16
  SPEAKER_01: to disrupt the CYP3A4 system, followed by fluoxetine and citalopram.
• 24:21
  SPEAKER_00: But even with these,
• 24:22
  SPEAKER_00: the calcineurin levels must be monitored obsessively until
• 24:25
  SPEAKER_00: the antidepressant reaches a steady state and the absolute contraindications.
• 24:30
  SPEAKER_01: Nifazodone is strictly forbidden.
• 24:32
  SPEAKER_01: It is a potent inhibitor of CYP3A4 and will reliably trigger toxicity.
• 24:37
  SPEAKER_01: The herbal supplement St. John's Wort is an aggressive inducer of CYP3A4.
• 24:41
  SPEAKER_01: It will drop immunosuppressant levels and trigger acute organ rejection.
• 24:45
  SPEAKER_00: Tricyclic antidepressants were also generally avoided due
• 24:48
  SPEAKER_00: to their anticholinergic effects and quinidine-like slowing of cardiac conduction,
• 24:52
  SPEAKER_00: which a denervated transplanted heart tolerates very poorly.
• 24:56
  SPEAKER_01: If a patient doesn't qualify for a transplant or they are deteriorating while on
• 25:00
  SPEAKER_01: the waitlist, cardiology might implant a left ventricular assist device, an LVAD.
• 25:06
  SPEAKER_00: It is a continuous flow mechanical pump implanted directly into the apex of
• 25:11
  SPEAKER_00: the left ventricle, routing blood past the failing valve into the aorta.
• 25:16
  SPEAKER_00: The patient relies on an external battery pack connected via a driveline that exits
• 25:21
  SPEAKER_00: through the abdomen.
• 25:22
  SPEAKER_01: There are over 10,000 people living with these devices.
• 25:25
  SPEAKER_00: Conceptually,
• 25:26
  SPEAKER_00: living with an audible,
• 25:28
  SPEAKER_00: whirring mechanical pump in your chest,
• 25:30
  SPEAKER_00: knowing that if the battery dies or the wire catches on a doorknob,
• 25:33
  SPEAKER_00: you die instantly?
• 25:34
  SPEAKER_00: That sounds like a recipe for crippling anxiety.
• 25:37
  SPEAKER_01: The intuition suggests massive psychiatric comorbidity, but the data reveals a paradox.
• 25:42
  SPEAKER_01: A massive study of over 15,000 LVAD recipients found
• 25:46
  SPEAKER_01: that psychiatric comorbidities were substantially lower in this population than in
• 25:51
  SPEAKER_01: the general public.
• 25:51
  SPEAKER_00: Wait, lower?
• 25:52
  SPEAKER_01: Yeah, much lower.
• 25:54
  SPEAKER_01: Furthermore,
• 25:54
  SPEAKER_01: a history of drug or alcohol abuse did not correlate with an increased risk
• 25:58
  SPEAKER_01: of mortality in the LVAD group.
• 26:00
  SPEAKER_00: That suggests the strict psychosocial barriers we use
• 26:03
  SPEAKER_00: for allocating scarce human organs might be unnecessarily restrictive when it comes
• 26:08
  SPEAKER_00: to mechanical devices.
• 26:10
  SPEAKER_00: But the LVAD introduces a very dark, unique clinical dilemma.
• 26:15
  SPEAKER_01: It does.
• 26:15
  SPEAKER_01: Implantation of an LVAD introduces a highly accessible instantaneous means of suicide.
• 26:22
  SPEAKER_01: The patient literally holds their own life support in their hands.
• 26:26
  SPEAKER_01: They can actively disconnect the driveline or passively allow the batteries to drain.
• 26:30
  SPEAKER_00: A study evaluating an LVAD registry in France found a 2% rate of attempted
• 26:34
  SPEAKER_00: or completed suicide within 19 months of implantation.
• 26:38
  SPEAKER_01: The ethical tightrope here is dizzying.
• 26:41
  SPEAKER_01: If an LVAD patient comes to the emergency room and states they intend
• 26:44
  SPEAKER_01: to unplug their device, how does the psychiatrist manage that?
• 26:48
  SPEAKER_01: You can't safely physically restrain someone with an abominable driveline.
• 26:51
  SPEAKER_00: It is one of the most demanding consultations in psychosomatic medicine.
• 26:55
  SPEAKER_00: Acute inpatient psychiatric units are rarely equipped to medically manage an LVAD,
• 26:59
  SPEAKER_00: so the patient usually stays on a medical floor with a sitter.
• 27:02
  SPEAKER_00: The clinical imperative is differentiating two wildly different states of mind.
• 27:06
  SPEAKER_01: Right.
• 27:07
  SPEAKER_01: Is this an impulsive act driven by a treatable severe depressive episode?
• 27:11
  SPEAKER_01: Or is this a rational, considered decision to withdraw life-sustaining medical treatment?
• 27:17
  SPEAKER_00: Because end stage heart failure,
• 27:19
  SPEAKER_00: even with an LVAD,
• 27:20
  SPEAKER_00: can involve unbearable physical suffering, frequent strokes and systemic infections.
• 27:26
  SPEAKER_00: A patient possessing full medical decision making capacity has the legal
• 27:31
  SPEAKER_00: and ethical right to withdraw life prolonging therapy.
• 27:34
  SPEAKER_01: The psychiatrist's role is to rigorously evaluate for capacity,
• 27:38
  SPEAKER_01: rule out cognitive distortion driven by treatable effective illness,
• 27:42
  SPEAKER_01: and facilitate a consensus among the medical team,
• 27:44
  SPEAKER_01: the palliative care team, the patient, and the family.
• 27:47
  SPEAKER_00: We've looked at chronic failure.
• 27:49
  SPEAKER_00: Let S shift to acute structural changes.
• 27:52
  SPEAKER_00: Cardiomyopathies and valvular disease.
• 27:55
  SPEAKER_00: The textbook highlights a condition that perfectly encapsulates the mind-body interface.
• 27:59
  SPEAKER_00: Takotsubo syndrome, widely known as broken heart syndrome.
• 28:02
  SPEAKER_01: It is an acute, generally reversible cardiac syndrome that mimics a massive heart attack.
• 28:07
  SPEAKER_01: It accounts for about 2% of patients presenting to the hospital
• 28:09
  SPEAKER_01: with suspected acute coronary syndrome.
• 28:11
  SPEAKER_00: But when they do an angiogram, the coronary arteries are completely clear.
• 28:16
  SPEAKER_00: Instead,
• 28:16
  SPEAKER_00: the echocardiogram shows the apex of the left ventricle ballooning outward,
• 28:21
  SPEAKER_00: rendering it unable to contract.
• 28:23
  SPEAKER_01: It takes the exact shape of a takotubo,
• 28:26
  SPEAKER_01: a traditional Japanese ceramic pot used to trap octopuses.
• 28:30
  SPEAKER_01: Wide at the bottom, narrow at the neck.
• 28:32
  SPEAKER_00: And the trigger is rarely physical exertion.
• 28:35
  SPEAKER_00: It is almost always preceded by severe emotional or physical stress,
• 28:39
  SPEAKER_00: the sudden death of a spouse,
• 28:41
  SPEAKER_00: a catastrophic financial loss,
• 28:43
  SPEAKER_00: an intense argument, or a severe non-cardiac medical illness.
• 28:47
  SPEAKER_01: The emotion physically reshapes the ventricle.
• 28:50
  SPEAKER_00: How does that even happen?
• 28:51
  SPEAKER_01: The mechanism is a massive sudden surge of catecholamines epinephrine and norepinephrine.
• 28:57
  SPEAKER_01: The apex of the left ventricle has the highest density of beta adrenergic receptors
• 29:00
  SPEAKER_01: in the heart.
• 29:01
  SPEAKER_00: So when that tsunami of adrenaline hits, those receptors are overwhelmed.
• 29:05
  SPEAKER_01: Exactly.
• 29:05
  SPEAKER_01: The catecholamines become directly toxic to the myocytes,
• 29:08
  SPEAKER_01: stunning the tissue and paralyzing the apical muscle,
• 29:11
  SPEAKER_01: causing it to balloon outward while the base of the heart continues
• 29:13
  SPEAKER_01: to squeeze normally.
• 29:15
  SPEAKER_00: The demographics here are striking.
• 29:17
  SPEAKER_00: It is overwhelmingly a disease of postmenopausal women.
• 29:21
  SPEAKER_00: Why is the male heart,
• 29:22
  SPEAKER_00: or the younger female heart, relatively immune to this specific structural stunning?
• 29:27
  SPEAKER_01: It comes down to the neuroprotective and cardioprotective effects of estrogen.
• 29:31
  SPEAKER_01: Estrogen acts as a systemic symbolytic.
• 29:34
  SPEAKER_01: It dampens the reactivity of the sympathetic nervous system.
• 29:36
  SPEAKER_00: It stabilizes the HPA axis response to stress.
• 29:40
  SPEAKER_00: And crucially,
• 29:40
  SPEAKER_00: it modulates the expression and sensitivity of those beta adrenoreceptors in
• 29:44
  SPEAKER_00: the myocardium.
• 29:45
  SPEAKER_01: When estrogen levels plummet after menopause, the myocardium loses that biochemical shield.
• 29:51
  SPEAKER_01: It becomes hypersensitive to sudden catecholamine surges.
• 29:54
  SPEAKER_00: This demands specific clinical reasoning from the psychiatrist.
• 29:58
  SPEAKER_00: If a postmenopausal woman suffers Takotsubo syndrome after a profound bereavement
• 30:03
  SPEAKER_00: and she subsequently develops clinical depression or PTSD requiring medication,
• 30:07
  SPEAKER_00: what is the prescribing role?
• 30:09
  SPEAKER_01: You must think mechanistically.
• 30:11
  SPEAKER_01: The pathology is driven by an excess of catecholamines.
• 30:14
  SPEAKER_01: Therefore, you must avoid any psychotropic medication that increases noradinergic tone.
• 30:18
  SPEAKER_00: So serotonin norepinephrine reuptake inhibitors or SNRIs like venlafaxine,
• 30:23
  SPEAKER_00: bupropion, tricyclic antidepressants, and MAOIs are all contraindicated.
• 30:28
  SPEAKER_01: You cannot introduce more norepinephrine into a system that just suffered
• 30:31
  SPEAKER_01: a norepinephrine-induced structural injury.
• 30:35
  SPEAKER_01: You stick to pure SSRIs.
• 30:37
  SPEAKER_00: Let's look at a cardiomyopathy directly caused by psychiatric medication.
• 30:42
  SPEAKER_00: Clozapine-associated cardiotoxicity.
• 30:44
  SPEAKER_00: We mentioned clozapine earlier regarding metabolic syndrome,
• 30:47
  SPEAKER_00: but there is an acute structural risk.
• 30:49
  SPEAKER_01: Clozapine is a highly effective,
• 30:51
  SPEAKER_01: often life-saving antipsychotic reserve for treatment-resistant schizophrenia.
• 30:56
  SPEAKER_01: But it carries rare, life-threatening cardiac risks.
• 30:59
  SPEAKER_00: The most immediate is clozapine-associated myocarditis, or CAM.
• 31:03
  SPEAKER_00: This is an acute inflammation of the heart muscle that typically presents within
• 31:06
  SPEAKER_00: the first four weeks of treatment.
• 31:08
  SPEAKER_01: The mechanism here isn't adrenaline.
• 31:10
  SPEAKER_01: It's an immune reaction.
• 31:11
  SPEAKER_01: It is theorized to be a type 1 IgE-mediated acute hypersensitivity reaction.
• 31:17
  SPEAKER_01: The immune system mounts an allergic attack on the myocardial tissue.
• 31:20
  SPEAKER_00: The patient presents with dysmoia,
• 31:22
  SPEAKER_00: tachycardia out of proportion to fever, and flu-like symptoms.
• 31:25
  SPEAKER_00: It can rapidly progress to fatal heart failure.
• 31:28
  SPEAKER_01: Clozapine can also cause a more insidious chronic cardiomyopathy,
• 31:32
  SPEAKER_01: a global dilation and weakening of the ventricle that presents months or years
• 31:37
  SPEAKER_01: into therapy.
• 31:38
  SPEAKER_00: The textbook outlines rigorous monitoring protocols,
• 31:41
  SPEAKER_00: baseline ECG,
• 31:43
  SPEAKER_00: troponins, C-reactive protein, and weekly clinical assessments for the first month.
• 31:48
  SPEAKER_00: But it includes a crucial ethical caveat about resource limitations.
• 31:51
  SPEAKER_01: Yes, it states that the absence
• 31:53
  SPEAKER_01: of extensive cardiac monitoring resources should not absolutely preclude treatment
• 31:58
  SPEAKER_01: with clozapine when the cardiac risk is heavily outweighed by the risk
• 32:01
  SPEAKER_01: of severe psychiatric morbidity.
• 32:03
  SPEAKER_00: So if a patient is severely suicidal or violently psychotic and refractory
• 32:07
  SPEAKER_00: to all other agents,
• 32:08
  SPEAKER_00: the inability to get a weekly troponin draw shouldn't mean they're denied
• 32:12
  SPEAKER_00: the only drug that might save their life.
• 32:14
  SPEAKER_01: The physician must weigh the risks.
• 32:16
  SPEAKER_01: However,
• 32:17
  SPEAKER_01: if a patient does develop CLOMs,
• 32:19
  SPEAKER_01: re-challenging them with Clozapine in
• 32:20
  SPEAKER_01: the future is almost universally contraindicated.
• 32:24
  SPEAKER_00: Let us move from the muscle to the doors of the engine room, the valves.
• 32:29
  SPEAKER_00: Valvular heart disease is massively prevalent in an aging population,
• 32:32
  SPEAKER_00: specifically aortic stenosis.
• 32:35
  SPEAKER_00: The valve calcifies,
• 32:37
  SPEAKER_00: narrows,
• 32:37
  SPEAKER_00: and the surgical fix is replacing it either via open heart surgery,
• 32:41
  SPEAKER_00: SAVR, or a transcatheter procedure, TVI.
• 32:45
  SPEAKER_01: Cardiologists have historically relied on anatomical
• 32:48
  SPEAKER_01: and physiological scoring systems, like Euroscore 2, to predict surgical mortality.
• 32:53
  SPEAKER_01: These models look at renal function, pulmonary disease, and ventricular function.
• 32:57
  SPEAKER_00: But they historically ignored the brain,
• 33:00
  SPEAKER_00: which the psychiatric literature argues is a fatal oversight.
• 33:03
  SPEAKER_01: Literally fatal.
• 33:04
  SPEAKER_01: Depression,
• 33:04
  SPEAKER_01: anxiety,
• 33:05
  SPEAKER_01: and cognitive impairment are massive,
• 33:07
  SPEAKER_01: independent risk factors for adverse outcomes following cardiac surgery.
• 33:11
  SPEAKER_01: A screening tool called Smarty was developed to bridge this gap.
• 33:14
  SPEAKER_00: And it incorporates the mini-cog for cognition,
• 33:16
  SPEAKER_00: the PHQ-2 for depression, and frailty assessments.
• 33:19
  SPEAKER_00: What did the data from these holistic screens reveal?
• 33:22
  SPEAKER_01: The Smarty tool showed
• 33:23
  SPEAKER_01: that baseline cognitive deficits independently predict postoperative delirium
• 33:27
  SPEAKER_01: and 30-day mortality.
• 33:29
  SPEAKER_00: The Frailty AVR study demonstrated
• 33:31
  SPEAKER_00: that unrecognized persistent depression severely increases the risk
• 33:35
  SPEAKER_00: of mortality post-valve replacement.
• 33:37
  SPEAKER_01: The physiological stress of the cardiopulmonary bypass circuit combined with
• 33:41
  SPEAKER_01: a depressed or cognitively vulnerable nervous system creates a high risk
• 33:45
  SPEAKER_01: for catastrophic post-operative decline.
• 33:47
  SPEAKER_00: We also have to address valves destroyed by infection,
• 33:50
  SPEAKER_00: which brings us to a highly stigmatized intersection of cardiology,
• 33:53
  SPEAKER_00: surgery, and addiction psychiatry.
• 33:56
  SPEAKER_00: Injection Drug Use Infective Endocarditis, or IDUIE.
• 34:00
  SPEAKER_01: The incidence of IDUIE has exploded, driven primarily by the opioid epidemic.
• 34:05
  SPEAKER_01: Intravenous drug use introduces bacteria directly into the venous bloodstream.
• 34:10
  SPEAKER_00: The bacteria colonize the right-sided valves,
• 34:13
  SPEAKER_00: usually the tricuspid valve-forming vegetations that destroy the tissue.
• 34:17
  SPEAKER_00: Up to 40% of these patients require urgent surgical valve replacement
• 34:20
  SPEAKER_00: during their first episode.
• 34:21
  SPEAKER_01: But the underlying disease,
• 34:23
  SPEAKER_01: the severe opioid use disorder, often goes unaddressed by the surgical teams.
• 34:27
  SPEAKER_00: Which guarantees failure.
• 34:29
  SPEAKER_00: Because the addiction remains untreated,
• 34:32
  SPEAKER_00: more than half of these patients will require a second,
• 34:35
  SPEAKER_00: incredibly dangerous repeat operation because they relapse,
• 34:38
  SPEAKER_00: inject again, and infect the new proxetic valve.
• 34:42
  SPEAKER_01: To combat this,
• 34:43
  SPEAKER_01: some cardiothoracic surgical centers instituted policies requiring patients
• 34:47
  SPEAKER_01: to sign abstinence contracts before they would agree to operate.
• 34:51
  SPEAKER_01: We will not give you a new valve unless you promise, in writing, never to use heroin again.
• 34:56
  SPEAKER_00: The textbook is unequivocal on this.
• 34:58
  SPEAKER_00: Abstinence contracts are clinically ineffective and ethically unjustifiable.
• 35:03
  SPEAKER_00: Asking a patient in the throes of acute life-threatening infective endocarditis
• 35:07
  SPEAKER_00: who is simultaneously experiencing acute opioid withdrawal in the ICU
• 35:12
  SPEAKER_00: to meaningfully commit to lifelong abstinence as a condition
• 35:14
  SPEAKER_00: for life-saving surgery is a fundamental misunderstanding of the neurobiology
• 35:18
  SPEAKER_00: of addiction.
• 35:19
  SPEAKER_01: Exactly.
• 35:19
  SPEAKER_01: So what is the mandated evidence-based approach?
• 35:22
  SPEAKER_00: Optimal management requires the immediate integration of addiction psychiatry into
• 35:26
  SPEAKER_00: the surgical care plan.
• 35:28
  SPEAKER_00: Current guidelines mandate the initiation of medication-assisted treatment,
• 35:31
  SPEAKER_00: specifically buprenorphine or methadone, while the patient is still in the hospital.
• 35:35
  SPEAKER_01: Treating the opioid receptors with agonist therapy stabilizes the brain,
• 35:40
  SPEAKER_01: manages the withdrawal,
• 35:41
  SPEAKER_01: and has been definitively proven to reduce mortality,
• 35:44
  SPEAKER_01: shorten the length of stay,
• 35:45
  SPEAKER_01: and dramatically reduce the rate of future illicit drug use.
• 35:48
  SPEAKER_00: The addiction must be treated as aggressively as the bacterial infection.
• 35:53
  SPEAKER_00: Speaking of infections,
• 35:54
  SPEAKER_00: there is a fascinating pediatric condition in the textbook where
• 35:57
  SPEAKER_00: a bacterial infection of the heart directly induces severe psychiatric symptoms.
• 36:02
  SPEAKER_01: Rheumatic heart disease and its link to childhood OCD.
• 36:05
  SPEAKER_00: Acute rheumatic fever is a systemic inflammatory condition triggered by
• 36:09
  SPEAKER_00: an untreated group,
• 36:11
  SPEAKER_00: a beta hemolytic streptococcal infection, a simple case of strep throat.
• 36:15
  SPEAKER_01: It causes severe permanent damage to the heart valves,
• 36:18
  SPEAKER_01: known as rheumatic heart disease, which remains a massive global health burden.
• 36:22
  SPEAKER_00: But the psychiatric manifestation is PANDAS,
• 36:25
  SPEAKER_00: pediatric autoimmune neuropsychiatric disorders associated
• 36:29
  SPEAKER_00: with streptococcal infections.
• 36:30
  SPEAKER_00: A child gets strep throat,
• 36:31
  SPEAKER_00: and weeks later,
• 36:32
  SPEAKER_00: they suddenly develop crippling obsessive-compulsive disorder or severe motor tics.
• 36:37
  SPEAKER_00: How does a throat infection rewire the basal ganglia?
• 36:40
  SPEAKER_01: Through a mechanism called molecular mimicry.
• 36:43
  SPEAKER_01: The immune system generates antineuronal antibodies designed to target
• 36:47
  SPEAKER_01: the streptococcal bacteria.
• 36:48
  SPEAKER_00: However,
• 36:48
  SPEAKER_00: the proteins on the bacteria closely resemble the proteins on the heart valves and
• 36:53
  SPEAKER_00: the proteins in the basal ganglia of the brain.
• 36:55
  SPEAKER_01: The antibodies get confused.
• 36:57
  SPEAKER_01: They cross-react,
• 36:58
  SPEAKER_01: attacking both the cardiac tissue and the neural circuitry,
• 37:01
  SPEAKER_01: simultaneously destroying the valve and triggering the acute onset
• 37:05
  SPEAKER_01: of psychiatric symptoms.
• 37:06
  SPEAKER_00: The interconnectivity is staggering.
• 37:09
  SPEAKER_00: We have covered the plumbing, the pump, and the valves.
• 37:12
  SPEAKER_00: Now we must turn to the electrical grid,
• 37:14
  SPEAKER_00: the rhythms of the heart,
• 37:15
  SPEAKER_00: and how our psychiatric medications threaten to short-circuit the entire system.
• 37:19
  SPEAKER_01: The heart's mechanical pumping is dictated by the flow of ions across
• 37:23
  SPEAKER_01: the myocardial cell membranes.
• 37:25
  SPEAKER_01: This electrical cycle has two main phases.
• 37:27
  SPEAKER_01: Depolarization,
• 37:29
  SPEAKER_01: where sodium and calcium rush in to trigger the contraction,
• 37:32
  SPEAKER_01: and repolarization, where potassium rushes out to reset the cell for the next beat.
• 37:36
  SPEAKER_00: On an ECG, the depolarization of the ventricles is the QRS complex.
• 37:40
  SPEAKER_00: The repolarization, the reset phase, is represented by the ST segment and the T wave.
• 37:45
  SPEAKER_01: And the total time from the start of the contraction to the end of the reset is the QT interval.
• 37:51
  SPEAKER_01: Because repolarization is an active process requiring metabolic energy,
• 37:55
  SPEAKER_01: it is highly vulnerable to disruption by ischemia,
• 37:58
  SPEAKER_01: electrolyte imbalances, and psychotropic medications.
• 38:00
  SPEAKER_00: And when we measure it, we calculate the QT interval corrected for the patient's heart rate.
• 38:06
  SPEAKER_00: Because the interval naturally shortens when the heart beats faster.
• 38:09
  SPEAKER_00: Why does a prolonged QTC terrify psychiatrists and cardiologists alike?
• 38:13
  SPEAKER_01: Because a prolonged repolarization phase creates a window of vulnerability.
• 38:18
  SPEAKER_01: If the reset takes too long,
• 38:20
  SPEAKER_01: an early after depolarization can trigger
• 38:22
  SPEAKER_01: a lethal chaotic arrhythmia called torsades to point.
• 38:26
  SPEAKER_00: The ventricles stop pumping effectively and just quiver.
• 38:29
  SPEAKER_00: Without immediate defibrillation,
• 38:30
  SPEAKER_00: torsades frequently degenerates into ventricular fibrillation
• 38:33
  SPEAKER_00: and sudden cardiac death.
• 38:35
  SPEAKER_01: So how do our medications physically prolong that interval?
• 38:38
  SPEAKER_01: What are they doing at the cellular level?
• 38:39
  SPEAKER_00: They block the potassium afflux.
• 38:42
  SPEAKER_00: Specifically,
• 38:42
  SPEAKER_00: they bind to and block the rapidly activating delayed rectifier potassium current,
• 38:47
  SPEAKER_00: which flows through a channel encoded by the HERG gene.
• 38:51
  SPEAKER_01: The human ether-a-go-go related gene?
• 38:53
  SPEAKER_00: Yes.
• 38:54
  SPEAKER_00: The HERG potassium channel has a uniquely large inner cavity.
• 38:58
  SPEAKER_00: Many psychotropic medications,
• 39:00
  SPEAKER_00: particularly antipsychotics,
• 39:02
  SPEAKER_00: are lipophilic and have a molecular structure that fits perfectly into this cavity,
• 39:06
  SPEAKER_00: plugging the channel from the inside.
• 39:08
  SPEAKER_01: When the potassium cannot exit the cell, the repolarization phase stretches out.
• 39:13
  SPEAKER_01: The QTC prolongs.
• 39:15
  SPEAKER_01: Let's stratify the risk because we prescribe these HERG-blocking drugs constantly.
• 39:21
  SPEAKER_00: Among the first-generation typical antipsychotics,
• 39:23
  SPEAKER_00: low-potency agents like theordazine and chlorpromazine carry the greatest risk
• 39:28
  SPEAKER_00: of QTC prolongation.
• 39:29
  SPEAKER_01: But I want to pause on haloperidol, intravenous haldol.
• 39:33
  SPEAKER_01: It is the gold standard for treating acute agitation and delirium in medical hospitals.
• 39:37
  SPEAKER_01: But residents are taught to fear it because it supposedly causes massive QTC prolongation.
• 39:42
  SPEAKER_00: This is a critical paradigm shift in the current literature.
• 39:45
  SPEAKER_00: Historically,
• 39:46
  SPEAKER_00: 4V haloperidol was heavily demonized regarding Torsod's wrist,
• 39:50
  SPEAKER_00: leading to black box warnings.
• 39:51
  SPEAKER_00: However,
• 39:52
  SPEAKER_00: the textbook points out
• 39:53
  SPEAKER_00: that recent rigorous evidence shows this risk has been vastly overstated.
• 39:57
  SPEAKER_01: A review of 10 prospective studies involving over 1,500 patients found that doses
• 40:01
  SPEAKER_01: of IV haloperidol,
• 40:03
  SPEAKER_01: up to 20 milligrams,
• 40:05
  SPEAKER_01: showed no evidence of clinically significant QTC prolongation
• 40:09
  SPEAKER_01: and carry no greater risk than other antipsychotic medications.
• 40:12
  SPEAKER_00: That is a massive clinical relief for managing postoperative delirium.
• 40:17
  SPEAKER_00: What about the second generation atypical antipsychotics?
• 40:20
  SPEAKER_01: We can stratify them into three tiers.
• 40:22
  SPEAKER_01: Zapracidone and aloperidone carry the highest risk of QTC prolongation in the class.
• 40:27
  SPEAKER_00: In the middle tier,
• 40:28
  SPEAKER_00: agents like olanzapine,
• 40:29
  SPEAKER_00: risperidone,
• 40:30
  SPEAKER_00: and quetupine prolong the QTC modestly but rarely push it into the danger zone
• 40:34
  SPEAKER_00: at therapeutic doses.
• 40:36
  SPEAKER_01: At the safest end,
• 40:36
  SPEAKER_01: aripiprazole and loracidone have not been associated with QTC prolongation at all.
• 40:41
  SPEAKER_01: Aripiprazole may actually shorten the interval slightly.
• 40:44
  SPEAKER_00: So if you're consulting on a cardiac floor,
• 40:46
  SPEAKER_00: eripiprazole and loracidone are the safest bets for the electrical grid.
• 40:49
  SPEAKER_00: What about antidepressants?
• 40:51
  SPEAKER_00: The FDA caused a massive panic over citalopram a decade ago.
• 40:54
  SPEAKER_01: In 2011,
• 40:55
  SPEAKER_01: the FDA issued a warning that citalopram should not be prescribed
• 40:58
  SPEAKER_01: at doses exceeding 40 milligrams per day due to dose-dependent QTC prolongation.
• 41:03
  SPEAKER_00: Studies indicated that pushing the dose to 60 milligrams increased the QTC by
• 41:07
  SPEAKER_00: about 10 to 20 milliseconds.
• 41:09
  SPEAKER_00: Acetylopram also separates out slightly, but with far less prolongation and no formal warning.
• 41:15
  SPEAKER_01: But the textbook analyses the downstream clinical fallout of that FDA warning,
• 41:20
  SPEAKER_01: and it is a case study in unintended consequences.
• 41:23
  SPEAKER_01: Clinicians panicked.
• 41:24
  SPEAKER_01: They reflexively reduced the doses of acetylopram in tens of thousands of stable patients.
• 41:29
  SPEAKER_00: The result was a massive documented surge in psychiatric relapse,
• 41:33
  SPEAKER_00: depressive morbidity, and hospitalizations.
• 41:36
  SPEAKER_00: And crucially, there was absolutely no demonstrable reduction in cardiac mortality.
• 41:41
  SPEAKER_00: The actual incidence of torsades de pointe caused solely It
• 41:46
  SPEAKER_01: requires clinical nuance.
• 41:47
  SPEAKER_01: You shouldn't destabilize a patient's remitted major depression over
• 41:50
  SPEAKER_01: a 15 millisecond theoretical shift
• 41:52
  SPEAKER_01: unless they have stacking risk factors like underlying bradycardia,
• 41:56
  SPEAKER_01: female sex, advanced age, or they are on a diuretic that lowers their potassium.
• 42:00
  SPEAKER_00: Exactly.
• 42:01
  SPEAKER_00: The risk is almost always multifactorial.
• 42:04
  SPEAKER_00: Which brings us to a terrifying clinical scenario outlined in the text,
• 42:07
  SPEAKER_00: the physical restraint of an agitated psychiatric patient.
• 42:10
  SPEAKER_01: Walk us through the physiological cascade of a restraint because it is
• 42:14
  SPEAKER_01: a perfect storm for sudden cardiac death.
• 42:16
  SPEAKER_00: When a highly agitated patient is physically restrained,
• 42:19
  SPEAKER_00: their sympathetic nervous system goes into overdrive.
• 42:22
  SPEAKER_00: Massive amounts of catecholamines are dumped into the bloodstream.
• 42:25
  SPEAKER_00: This immediately increases the heart rate and myocardial oxygen demand.
• 42:29
  SPEAKER_01: But simultaneously,
• 42:31
  SPEAKER_01: those catecholamines stimulate beta-2 receptors on the skeletal muscle cells,
• 42:35
  SPEAKER_01: which actively pump potassium out of the blood and into the muscle tissue.
• 42:39
  SPEAKER_00: So the stress of the restraint itself causes acute hypokalemia low potassium in the blood.
• 42:44
  SPEAKER_01: And low serum potassium drastically reduces the function of the HERG channels,
• 42:49
  SPEAKER_01: further prolonging repolarization.
• 42:51
  SPEAKER_00: Now imagine that agitated patient is administered a QTC prolonging antipsychotic
• 42:56
  SPEAKER_00: to calm them down.
• 42:57
  SPEAKER_00: You have a drug blocking the HERG channel from the inside,
• 43:00
  SPEAKER_00: a stress-induced drop in potassium starving the channel from the outside,
• 43:04
  SPEAKER_00: and a racing heart demanding rapid repolarization.
• 43:07
  SPEAKER_01: It is the exact recipe for torsades de points.
• 43:10
  SPEAKER_01: That mechanistic breakdown should change how every clinician approaches acute agitation.
• 43:16
  SPEAKER_01: We also need to touch on opiate replacement therapies.
• 43:19
  SPEAKER_00: We discussed how vital they are for endocarditis patients, but they carry electrical risks.
• 43:24
  SPEAKER_00: Methadone is a potent inhibitor of the HERG potassium channel and has a strong,
• 43:29
  SPEAKER_00: well-documented association with QTC prolongation and torsades.
• 43:33
  SPEAKER_01: Guidelines suggest obtaining a baseline ECG before initiation,
• 43:37
  SPEAKER_01: and if the QTC exceeds 500 milliseconds, methadone is generally contraindicated.
• 43:42
  SPEAKER_00: And the alternative, buprenorphine.
• 43:43
  SPEAKER_00: It has a hundredfold lower affinity for the HERG channel compared to methadone.
• 43:48
  SPEAKER_00: It is a significantly safer alternative with no known association
• 43:51
  SPEAKER_00: with clinically relevant QTC prolongation.
• 43:54
  SPEAKER_01: Let's briefly mention the upper chambers of the heart.
• 43:57
  SPEAKER_01: Atrial fibrillation, or AFib.
• 43:58
  SPEAKER_01: This is an irregular rhythm caused by chaotic depolarization in the atria.
• 44:03
  SPEAKER_00: It is incredibly common, and the autonomic nervous system heavily influences it.
• 44:07
  SPEAKER_00: A fascinating perspective study utilized electronic diaries
• 44:10
  SPEAKER_00: to track patients' emotional states prior to AFib episodes.
• 44:13
  SPEAKER_01: They found that negative affectivity feeling sad,
• 44:16
  SPEAKER_01: stressed,
• 44:17
  SPEAKER_01: or angry increased the likelihood of an acute AFib episode two to five-fold within
• 44:22
  SPEAKER_01: the following hour.
• 44:24
  SPEAKER_01: Conversely, states of happiness actually decrease the likelihood of an episode.
• 44:28
  SPEAKER_00: The electrical stability of the atria is profoundly sensitive to momentary emotional shifts.
• 44:33
  SPEAKER_00: As we move into our final conceptual section,
• 44:36
  SPEAKER_00: we need to discuss integration and clinical reasoning.
• 44:39
  SPEAKER_01: We've explored how the mind alters the heart.
• 44:41
  SPEAKER_01: But how do psychiatrists untangle cases where the heart and
• 44:44
  SPEAKER_01: the mind are literally masquerading as each other?
• 44:47
  SPEAKER_00: We have to look in both directions,
• 44:49
  SPEAKER_00: cardiac pathology mimicking psychiatric illness
• 44:51
  SPEAKER_00: and psychiatric illness mimicking cardiac pathology.
• 44:55
  SPEAKER_00: The most perilous scenario for the psychiatrist is diagnostic overshadowing.
• 44:59
  SPEAKER_01: This occurs when a clinician encounters a patient with a known psychiatric history
• 45:04
  SPEAKER_01: and reflexively attributes all new acute symptoms to their mental illness,
• 45:08
  SPEAKER_01: failing to investigate a life-threatening medical cause.
• 45:11
  SPEAKER_00: Give us the classic example from the cardiovascular system.
• 45:14
  SPEAKER_01: Pulmonary thromboembolism or PTE.
• 45:17
  SPEAKER_01: A blood clot breaks off from the deep veins,
• 45:19
  SPEAKER_01: travels through the right side of the heart and lodges in the pulmonary artery.
• 45:23
  SPEAKER_00: The patient presents with sudden dyspnoia,
• 45:25
  SPEAKER_00: chest pain,
• 45:26
  SPEAKER_00: palpitations, diaphoresis and a profound, overwhelming sense of impending doom.
• 45:32
  SPEAKER_00: That is the exact diagnostic criteria for a severe panic attack.
• 45:36
  SPEAKER_01: It is identical.
• 45:37
  SPEAKER_01: If that patient has a documented history of anxiety,
• 45:39
  SPEAKER_01: the triage team might administer a benzodiazepine,
• 45:43
  SPEAKER_01: observe them calming down slightly, and discharge them.
• 45:45
  SPEAKER_00: But PTE is rapidly fatal.
• 45:48
  SPEAKER_00: The clinician must actively hunt for the masquerader.
• 45:51
  SPEAKER_00: Are there risk factors for a clot?
• 45:53
  SPEAKER_00: Recent long-haul travel, surgery, immobilization, or oral contraceptive use?
• 45:58
  SPEAKER_00: You must rule out the physical before accepting the psychiatric.
• 46:01
  SPEAKER_01: The electrical masqueraders are tricky too.
• 46:03
  SPEAKER_01: Arrhythmias like torsades or Brugada syndrome can cause sudden drops
• 46:07
  SPEAKER_01: in cerebral blood flow syncope.
• 46:08
  SPEAKER_00: The resulting brain hypoxia can trigger myoclonic jerks that look exactly like
• 46:13
  SPEAKER_00: a grand mal seizure or present as sudden unexplained falls that are misdiagnosed
• 46:17
  SPEAKER_00: as conversion disorder or non-epileptic seizures.
• 46:20
  SPEAKER_01: What about the reverse?
• 46:21
  SPEAKER_01: The mind mimicking the heart?
• 46:23
  SPEAKER_01: Non-cardiac chest pain represents a massive burden on A&E departments.
• 46:28
  SPEAKER_01: Somatic symptom disorder, PTSD,
• 46:30
  SPEAKER_01: and panic disorder account for roughly 30% of all patients presenting
• 46:34
  SPEAKER_01: with palpitations.
• 46:36
  SPEAKER_00: The textbook cites a staggering statistic.
• 46:38
  SPEAKER_00: In a study of almost 2,000 consecutive patients presenting to an emergency room
• 46:43
  SPEAKER_00: with chest pain, panic disorder was diagnosed in 38% of them.
• 46:47
  SPEAKER_01: Nearly 4 out of 10 patients whose chest pain is ultimately non-cardiac are twice
• 46:52
  SPEAKER_01: as likely to receive a diagnosis of panic disorder.
• 46:55
  SPEAKER_00: Demographically,
• 46:56
  SPEAKER_00: they skew younger and female,
• 46:58
  SPEAKER_00: and they often describe the pain with atypical features, sharp,
• 47:01
  SPEAKER_00: fleeting,
• 47:02
  SPEAKER_00: or highly localized,
• 47:03
  SPEAKER_00: rather than the classic crushing radiating pressure of ischemia.
• 47:07
  SPEAKER_01: So if a clinician has successfully navigated the masqueraders,
• 47:10
  SPEAKER_01: confirmed the presence of actual cardiac disease,
• 47:13
  SPEAKER_01: and diagnosed a comorbid psychiatric illness, let's summarize the prescribing rules.
• 47:18
  SPEAKER_01: How does a psychiatrist safely operate the control room when the engine is compromised?
• 47:22
  SPEAKER_00: For major depressive disorder, sertraline is the uncontested first-line agent.
• 47:27
  SPEAKER_00: This is grounded in the SEDHART trial,
• 47:29
  SPEAKER_00: the Sertraline Antidepressant Heart Attack Randomized Trial.
• 47:33
  SPEAKER_01: It proved that sertraline is not only effective
• 47:35
  SPEAKER_01: in treating depression post-acute coronary syndrome, but it is remarkably safe.
• 47:40
  SPEAKER_01: It exerts no negative inotropic effects on the pumping action of the heart,
• 47:44
  SPEAKER_01: does not alter hemodynamics, and does not prolong the QTC.
• 47:48
  SPEAKER_00: We did mention the bleeding risk earlier due to platelet serotonin apletion.
• 47:52
  SPEAKER_01: Yes, inhibiting platelet aggregation does mildly increase the risk
• 47:55
  SPEAKER_01: of gastrointestinal bleeding,
• 47:57
  SPEAKER_01: particularly if the patient is on dual antiplatelet therapy
• 48:00
  SPEAKER_01: or anticoagulants like warfarin.
• 48:02
  SPEAKER_00: However,
• 48:03
  SPEAKER_00: the cardiovascular benefits of treating the depression,
• 48:06
  SPEAKER_00: lowering the cortisol,
• 48:07
  SPEAKER_00: and improving adherence overwhelmingly outweigh the bleeding risk.
• 48:11
  SPEAKER_00: Using proton pump inhibitors can effectively mitigate the GI risk.
• 48:15
  SPEAKER_01: And what about the older antidepressants, tricyclics?
• 48:17
  SPEAKER_00: Tricyclic antidepressants like amitriptyline or clomopramine are strictly avoided
• 48:22
  SPEAKER_00: in patients with ischemic heart disease or conduction delays.
• 48:25
  SPEAKER_01: They possess type 1a antiarrhythmic properties.
• 48:28
  SPEAKER_01: They block sodium channels, which widens the QRS complex.
• 48:31
  SPEAKER_01: They cause orthostatic hypotension via alpha adrenergic blockade.
• 48:35
  SPEAKER_01: And they significantly increase the risk of mortality post-MI.
• 48:39
  SPEAKER_00: We established that IV heliparinol is safe for treating delirium post-cardiac surgery.
• 48:44
  SPEAKER_00: What about ADHD medications?
• 48:47
  SPEAKER_00: I feel like adult patients and parents are constantly terrified that prescribing
• 48:50
  SPEAKER_00: a stimulant like methylphenidate or amphetamine is going to trigger
• 48:53
  SPEAKER_00: a sudden heart attack.
• 48:55
  SPEAKER_01: Stimulants are sympathomimetics.
• 48:56
  SPEAKER_01: They absolutely increase heart rate and systolic blood pressure via central
• 49:00
  SPEAKER_01: and peripheral nervous system activation.
• 49:03
  SPEAKER_00: However,
• 49:03
  SPEAKER_00: massive population-based studies have consistently shown that in healthy young
• 49:07
  SPEAKER_00: and middle-aged adults,
• 49:08
  SPEAKER_00: the use of ADHD medications is not associated with an increased risk
• 49:12
  SPEAKER_00: of serious cardiovascular events like MI or sudden cardiac death.
• 49:16
  SPEAKER_01: So they don't need a baseline ECG before starting Adderall.
• 49:19
  SPEAKER_00: Contrary to popular anxiety,
• 49:22
  SPEAKER_00: Routine pretreatment screening with an ECG is not currently recommended by pediatric
• 49:26
  SPEAKER_00: or psychiatric academies for healthy individuals without a personal
• 49:30
  SPEAKER_00: or family history of structural heart disease or syncope.
• 49:34
  SPEAKER_00: Checking resting blood pressure and heart rate is sufficient.
• 49:37
  SPEAKER_01: We have covered an immense amount of physiology and clinical data.
• 49:40
  SPEAKER_01: Let us synthesize this journey.
• 49:42
  SPEAKER_00: We started by looking at the heart as a mechanical pump,
• 49:44
  SPEAKER_00: the engine room,
• 49:45
  SPEAKER_00: but we've seen how it is profoundly bi-directionally wired to the brain.
• 49:51
  SPEAKER_00: Chronic depression unleashes cortisol that corrodes the endothelial lining
• 49:54
  SPEAKER_00: and makes platelets hyperreactive, doubling the risk of CAD.
• 49:58
  SPEAKER_01: Acute stress clamps down atherosclerotic arteries.
• 50:01
  SPEAKER_01: Severe mental illness creates a lethal web of metabolic medication side effects
• 50:06
  SPEAKER_01: and systemic neglect.
• 50:07
  SPEAKER_01: An intense grief can unleash a catecholamine storm that physically balloons the left ventricle.
• 50:13
  SPEAKER_00: The overarching lesson is that the distinction between physical illness
• 50:16
  SPEAKER_00: and mental illness in this space is entirely artificial.
• 50:19
  SPEAKER_00: They are the same system, failing in different ways.
• 50:21
  SPEAKER_01: Which brings me to a final provocative thought to leave you with before we hit
• 50:25
  SPEAKER_01: the learning reinforcement questions.
• 50:28
  SPEAKER_01: If social isolation and untreated childhood throat infection and
• 50:32
  SPEAKER_01: the daily suppression of negative emotion can physically reshape the myocardium
• 50:37
  SPEAKER_01: or short circuit its electrical grid, well,
• 50:39
  SPEAKER_01: should we stop viewing preventative cardiology and preventative psychiatry
• 50:43
  SPEAKER_01: as two different fields?
• 50:45
  SPEAKER_00: If the engine room and the control room are sharing the same toxic cortisol and
• 50:49
  SPEAKER_00: the same compromised blood, maybe protecting the mind isn't just an adjunct therapy.
• 50:53
  SPEAKER_00: Maybe protecting the mind is the ultimate form of protecting the heart.
• 50:57
  SPEAKER_01: The clinical data certainly demands that paradigm shift.
• 51:00
  SPEAKER_00: All right, let's lock in this knowledge.
• 51:02
  SPEAKER_00: We're going to run through eight single best answer questions based directly on
• 51:06
  SPEAKER_00: the textbook chapter.
• 51:07
  SPEAKER_00: I will read the question and the options,
• 51:09
  SPEAKER_00: pause for a moment so you can test your own reasoning,
• 51:11
  SPEAKER_00: and then our expert will break down the answer and the mechanism.
• 51:14
  SPEAKER_00: Let's jump in.
• 51:15
  SPEAKER_00: Question one.
• 51:16
  SPEAKER_00: Which of the following psychological profiles has
• 51:18
  SPEAKER_00: the most robust contemporary evidence linking it to an increased risk
• 51:21
  SPEAKER_00: of cardiac events in patients with coronary artery disease?
• 51:25
  SPEAKER_00: A.
• 51:26
  SPEAKER_00: Type A, personality, anger and impatience.
• 51:28
  SPEAKER_00: B, type D, personality, negative affectivity and social inhibition.
• 51:33
  SPEAKER_00: C, histrionic traits.
• 51:35
  SPEAKER_00: D, obsessive compulsive traits.
• 51:38
  SPEAKER_01: The correct answer is B, Type D Personality.
• 51:41
  SPEAKER_01: While the older Type A profile of hostility dominated the literature in the 70s,
• 51:45
  SPEAKER_01: the contemporary data steadily replicates that the combination
• 51:48
  SPEAKER_01: of chronic negative affectivity,
• 51:49
  SPEAKER_01: sadness,
• 51:50
  SPEAKER_01: and worry,
• 51:50
  SPEAKER_01: combined with the social inhibition of suppressing those emotions,
• 51:53
  SPEAKER_01: significantly increases the risk of adverse cardiac events.
• 51:56
  SPEAKER_00: Question 2.
• 51:57
  SPEAKER_00: Which antidepressant has been most extensively studied and is considered
• 52:01
  SPEAKER_00: the first-line pharmacologic treatment for major depression in patients following
• 52:05
  SPEAKER_00: an acute coronary syndrome based on the SAIDHART trial?
• 52:08
  SPEAKER_00: A. Sitalopram.
• 52:09
  SPEAKER_00: B. Venlafaxine.
• 52:11
  SPEAKER_00: C. Sertraline.
• 52:12
  SPEAKER_00: D. Mirtazapine.
• 52:14
  SPEAKER_01: The correct answer is C. Sertraline.
• 52:16
  SPEAKER_01: The SEDHART trial definitively demonstrated its safety profile.
• 52:19
  SPEAKER_01: It showed no negative inotropic impact on the heart's plumbing ability,
• 52:23
  SPEAKER_01: no hemodynamic instability,
• 52:25
  SPEAKER_01: and successfully improved depressive symptoms and quality of life
• 52:28
  SPEAKER_01: in post-MI patients.
• 52:29
  SPEAKER_00: Question 3.
• 52:30
  SPEAKER_00: A 60-year-old post-menopausal woman presents with acute chest pain,
• 52:33
  SPEAKER_00: ECG changes,
• 52:34
  SPEAKER_00: and transient left ventricular wall motion abnormalities following the sudden death
• 52:38
  SPEAKER_00: of her spouse.
• 52:40
  SPEAKER_00: Angiography reveals entirely normal coronary arteries.
• 52:43
  SPEAKER_00: Which medication class should generally be avoided in her psychiatric management?
• 52:46
  SPEAKER_00: A. SSRIs.
• 52:48
  SPEAKER_00: B. Benzodiazepines.
• 52:49
  SPEAKER_00: C. SNRIs.
• 52:51
  SPEAKER_00: D. Atypical antipsychotics.
• 52:53
  SPEAKER_01: The correct answer is C. SNRIs.
• 52:56
  SPEAKER_01: The clinical picture apical ballooning of the ventricle
• 52:59
  SPEAKER_01: after severe emotional stress in
• 53:00
  SPEAKER_01: a postmenopausal woman is classic Takotsuba syndrome.
• 53:04
  SPEAKER_01: The pathophysiology is driven by a catecholamine storm that stuns the myocardium due
• 53:10
  SPEAKER_01: to a loss of estrogen's protective symbolytic effects.
• 53:13
  SPEAKER_01: SNRIs increase norepinephrine,
• 53:16
  SPEAKER_01: which would exacerbate the catecholamine toxicity and should therefore be avoided.
• 53:20
  SPEAKER_01: Question 4.
• 53:20
  SPEAKER_00: When evaluating QTC prolongation risk among second-generation antipsychotics,
• 53:25
  SPEAKER_00: which two medications are considered to carry the lowest risk?
• 53:28
  SPEAKER_00: A, zepracidone and eloperidone.
• 53:30
  SPEAKER_00: B, clozapine and melanzapine.
• 53:32
  SPEAKER_00: C, quitepine and risperidone.
• 53:36
  SPEAKER_01: The correct answer is D.
• 53:38
  SPEAKER_01: Aripiprazole and loracidone are unique among the atypicals in
• 53:40
  SPEAKER_01: that they have not been associated with QTC prolongation via HERG channel blockade.
• 53:45
  SPEAKER_01: Aripiprazole may even shorten the interval slightly.
• 53:48
  SPEAKER_01: By contrast, zypracetone and aliperidone carry the highest risk in this class.
• 53:51
  SPEAKER_00: Question 5.
• 53:53
  SPEAKER_00: A patient with severe schizophrenia and highly sedentary behavior is prescribed clozapine.
• 53:58
  SPEAKER_00: Four weeks into treatment,
• 53:59
  SPEAKER_00: they develop dyspnoia,
• 54:00
  SPEAKER_00: tachycardia out of proportion to a mild fever, and flu-like symptoms.
• 54:04
  SPEAKER_00: Which of the following is the most likely cardiac complication?
• 54:07
  SPEAKER_00: A. Takotsubo cardiomyopathy.
• 54:10
  SPEAKER_00: B. Clozapine-associated myocarditis, or AMC.
• 54:13
  SPEAKER_00: Rheumatic heart disease.
• 54:14
  SPEAKER_00: D. Pulmonary thromboembolism.
• 54:16
  SPEAKER_01: The correct answer is B, clozapine-associated myocarditis.
• 54:20
  SPEAKER_01: This is a type 1 IgE-mediated acute hypersensitivity reaction,
• 54:23
  SPEAKER_01: an allergic inflammation of the myocardium that typically presents early
• 54:26
  SPEAKER_01: in treatment, often within the first month.
• 54:29
  SPEAKER_01: It manifests with rapid cardiac distress and flu-like symptoms.
• 54:32
  SPEAKER_00: Question 6.
• 54:33
  SPEAKER_00: A 35 year old patient with a severe history
• 54:36
  SPEAKER_00: of injection drug use develops infective endocarditis requiring surgical valve
• 54:40
  SPEAKER_00: replacement.
• 54:41
  SPEAKER_00: According to current guidelines, what is
• 54:43
  SPEAKER_00: the most appropriate approach regarding their underlying substance use disorder?
• 54:48
  SPEAKER_00: A, require a signed abstinence contract prior to surgery.
• 54:52
  SPEAKER_00: B, delay surgery until the patient completes a 30 day detox.
• 54:56
  SPEAKER_00: C, initiate medication assisted treatment like buprenorphine or methadone in hospital.
• 55:02
  SPEAKER_00: D. Withhold opioid agonists to prevent masking of cardiac pain.
• 55:05
  SPEAKER_01: The correct answer is C.
• 55:07
  SPEAKER_01: Guidelines mandate the immediate involvement of addiction specialists and
• 55:10
  SPEAKER_01: the initiation of medication-assisted treatment while the patient is admitted.
• 55:14
  SPEAKER_01: The textbook specifically notes that abstinence contracts are clinically ineffective
• 55:18
  SPEAKER_01: and ethically inappropriate during the critical period of acute infection
• 55:21
  SPEAKER_01: and withdrawal.
• 55:22
  SPEAKER_00: Question 7.
• 55:23
  SPEAKER_00: A psychiatric patient presents to the emergency department with acute onset
• 55:27
  SPEAKER_00: of severe anxiety,
• 55:28
  SPEAKER_00: Dyspnoia, palpitations, and a sense of impending doom following a long-haul flight.
• 55:34
  SPEAKER_00: They have no prior psychiatric history.
• 55:36
  SPEAKER_00: To avoid the trap of diagnostic overshadowing,
• 55:38
  SPEAKER_00: which life-threatening medical masquerader must be ruled out immediately, A.
• 55:42
  SPEAKER_00: Brigada syndrome, B.
• 55:44
  SPEAKER_00: pulmonary thromboembolism,
• 55:46
  SPEAKER_00: C. menstrual valve prolapse, D. hypertrophic cardiomyopathy.
• 55:51
  SPEAKER_01: The correct answer is B, pulmonary thromboembolism.
• 55:54
  SPEAKER_01: A blood clot in the pulmonary vasculature frequently masquerades as a severe panic attack.
• 55:58
  SPEAKER_01: Given the risk factor of immobility from a long-haul flight,
• 56:01
  SPEAKER_01: PTE must be ruled out to avoid diagnostic overshadowing where
• 56:05
  SPEAKER_01: a fatal medical crisis is falsely attributed to a new onset psychiatric condition.
• 56:09
  SPEAKER_00: Question 8.
• 56:10
  SPEAKER_00: When managing a patient who has recently received a heart transplant,
• 56:13
  SPEAKER_00: which of the following psychotropic medications should be strictly avoided due
• 56:16
  SPEAKER_00: to its high risk of altering immunosuppressant levels via the CYP3A4 enzyme system?
• 56:21
  SPEAKER_00: A, sertraline.
• 56:22
  SPEAKER_00: B, nefazodone.
• 56:23
  SPEAKER_00: C, acetylopram.
• 56:24
  SPEAKER_00: D, venlafaxine.
• 56:26
  SPEAKER_01: The correct answer is B, nefazodone.
• 56:29
  SPEAKER_01: It is a potent inhibitor of the CYP3A4 isoenzyme system,
• 56:34
  SPEAKER_01: which is exclusively responsible
• 56:35
  SPEAKER_01: for metabolizing vital calcineurin inhibitors like tacrolimus.
• 56:39
  SPEAKER_01: Inhibiting this pathway will cause immunosuppressant levels to spike,
• 56:43
  SPEAKER_01: risking severe nephrotoxicity.
• 56:45
  SPEAKER_01: St. John's wort is also strictly contraindicated as it induces the enzyme,
• 56:49
  SPEAKER_01: risking organ rejection.
• 56:51
  SPEAKER_00: And that wraps up our investigation.
• 56:53
  SPEAKER_00: Thank you for taking this deep dive with us into the engine room of the heart.
• 56:56
  SPEAKER_00: We highly encourage you to read chapter 27.2 alongside this discussion
• 57:00
  SPEAKER_00: to solidify these mental models.
• 57:02
  SPEAKER_00: Keep questioning the divide between the physical and the mental,
• 57:05
  SPEAKER_00: trust your clinical reasoning, and we'll catch you on the next deep dive.