Chapter review

Fitzgerald PMHNP board review. ch18. Disorders Revealed by the Cardiac Exam. This is drive 1 of 4. When I say Pause. Answer. wait, then I will give the answer. New section. Cardiac findings tied to psychiatric medications and diagnoses. Topic. Tricyclic Antidepressant (TCA) Cardiac Risks. Bottom Line Summary. * **Source Scope Note**: Fitzgerald Chapter 18 is not included in the provided notebook files (which cover Chapters 1 through 16), but **tricyclic antidepressant** (**TCA**) cardiac risks are extensively detailed in Fitzgerald Chapters 2, 8, and 9. * **Baseline ECG Mandate**: Obtaining a baseline **electrocardiogram** (**ECG**) is mandatory before starting a **tricyclic antidepressant** (**TCA**) such as **amitriptyline**, **nortriptyline**, **imipramine**, or **desipramine**, particularly in patients over age 40 or those with personal or family cardiac history. * **Electrophysiological Mechanism**: **TCAs** exert quinidine-like Class IA antiarrhythmic actions and block fast sodium channels, slowing cardiac conduction velocity and prolonging PR, QRS, and QTc intervals. * **QRS Duration Thresholds**: A QRS duration exceeding 100 milliseconds indicates an elevated risk for seizures, while a QRS duration exceeding 160 milliseconds predicts a high risk for lethal ventricular arrhythmias, including ventricular tachycardia and torsades de pointes. * **Absolute Contraindications**: Recent myocardial infarction, acute post-MI recovery phase, second-degree or third-degree heart block, severe bundle branch block, or existing baseline QTc prolongation are strict contraindications to **TCA** therapy. * **Autonomic Cardiac Effects**: Alpha-1 adrenergic receptor blockade by **TCAs** causes significant orthostatic hypotension and reflex tachycardia, while muscarinic anticholinergic blockade causes persistent sinus tachycardia. * **Lethality in Overdose**: **TCAs** have a narrow therapeutic index, and an acute overdose of as little as a 10-day supply (1 gram) can cause rapid fatal cardiac toxicity and sudden death. High-Yield Concept Map: TCA Cardiac Risks. Electrophysiology and Conduction Blockade. * **What it is**: **TCAs** inhibit cardiac fast sodium channels (Class IA antiarrhythmic effect) and delayed rectifier potassium channels, delaying cardiac depolarization and repolarization. * **Why boards care**: **TCA** cardiotoxicity is a leading cause of fatal drug overdose in psychiatric practice. * **Must know criteria**: Normal QRS is less than 100 milliseconds. QRS between 100 and 160 milliseconds indicates moderate toxicity. QRS greater than 160 milliseconds indicates severe toxicity. * **Typical board clue**: A depressed patient presenting after an ingestion with confusion, dry mouth, dilated pupils, hypotension, and a widened QRS complex on **ECG**. * **First-line**: Obtaining a baseline 12-lead **ECG** prior to prescribing is the mandatory **first-line** safety step. * **When the answer changes**: If the stem describes an acute overdose with QRS widening greater than 100 milliseconds, the **first-line** intervention changes to immediate intravenous sodium bicarbonate administration to alkalinize the serum and unbind the drug from sodium channels. * **Safety alert**: Never prescribe **TCAs** to patients with active suicidal ideation or a history of serious suicide attempts due to extreme lethality in overdose. Autonomic Cardiac Adverse Effects. * **Alpha-1 Adrenergic Blockade**: Causes peripheral vasodilation leading to orthostatic hypotension, dizziness, and reflex tachycardia. This is particularly dangerous in older adults due to elevated fall and fracture risks. * **Muscarinic Anticholinergic Blockade**: Inhibits vagal tone, causing persistent sinus tachycardia. * **Board trap**: Mistaking **TCA** induced sinus tachycardia or orthostatic dizziness for worsening anxiety or panic disorder, leading to inappropriate dose escalation instead of discontinuation. Compare and Distinguish. TCAs vs. SSRIs Cardiac Safety Profile. * **Think TCAs**: Quinidine-like sodium channel blockade, significant conduction delays, high risk of fatal arrhythmias in overdose, mandatory baseline **ECG**. * **Think SSRIs**: Favorable overall cardiovascular safety profile, minimal conduction interference, safe in mild overdose. (Note: citalopram requires dose capping at 20 mg daily in patients over age 60 due to dose-dependent QTc prolongation). * **Priority difference**: **TCAs** require pre-treatment cardiac screening and strict toxicity monitoring. **SSRIs** are the preferred first-line choice for patients with comorbid cardiovascular disease. * **What boards are really testing**: Selecting cardiosafe antidepressant agents in patients with pre-existing heart disease or elevated suicide risk. QRS Interval Risk Tiers in TCA Toxicity. * **QRS less than 100 ms**: Normal cardiac conduction; low risk of acute life-threatening arrhythmia. * **QRS 100 to 160 ms**: Moderate toxicity; significantly increased risk for grand mal seizures. * **QRS greater than 160 ms**: Severe cardiotoxicity; high risk for ventricular tachycardia, torsades de pointes, and cardiovascular collapse. * **What boards are really testing**: Identifying QRS width as the key diagnostic and prognostic marker driving emergency therapy in **TCA** overdose. Common Board Traps. * **The Youth Assumption Trap**: Assuming a young or physically active patient with depression does not require a baseline **ECG** before starting a **TCA**. National standards require baseline cardiac screening regardless of age when initiating cardiotoxic agents. * **The Refractory Escalation Trap**: Escalating the dose of **amitriptyline** or **imipramine** when a patient reports persistent palpitations or dizziness. These are direct toxic anticholinergic and alpha-blockade side effects, not undertreated anxiety. * **Choosing Dialysis in Toxicity**: Selecting hemodialysis or hemoperfusion for acute **TCA** overdose. **TCAs** are highly protein-bound with a large volume of distribution, making dialysis ineffective. The correct emergency treatment is intravenous sodium bicarbonate. Board-Style Practice Questions. Question 1. Question: A 52-year-old male with major depressive disorder presents for medication management. His symptoms have been non-responsive to trials of sertraline and escitalopram. The PMHNP considers initiating **nortriptyline**. Which of the following is the most appropriate initial diagnostic action before starting this medication? * A. Order a baseline serum creatinine and eGFR * B. Obtain a 12-lead electrocardiogram * C. Measure baseline liver function tests * D. Order a 24-hour Holter monitor Pause. Best answer: B. Obtain a 12-lead electrocardiogram Why it is correct: **Tricyclic antidepressants** exert quinidine-like Class IA antiarrhythmic actions that slow cardiac conduction velocity and can trigger lethal arrhythmias. Obtaining a baseline 12-lead **ECG** is a mandatory safety assessment prior to initiating a **TCA**, especially in patients over age 40 or those with cardiovascular risk factors. Why the other choices are wrong: * A. Serum creatinine and eGFR are essential baseline labs before starting **lithium**, but an **ECG** is the primary priority prior to **TCA** initiation. * B. Correct choice. * C. Liver function tests are monitored for **valproate** or **carbamazepine**, not the primary cardiac screening tool for **TCAs**. * D. A 24-hour Holter monitor is unnecessary for routine pre-treatment screening unless an active paroxysmal arrhythmia is suspected. Test-taking pearl: Always obtain a baseline **ECG** before starting a **tricyclic antidepressant** to rule out underlying conduction blocks or QTc prolongation. Concept tested: Pre-treatment baseline cardiac evaluation for tricyclic antidepressants. Question 2. Question: A 28-year-old female is brought to the emergency department after an intentional overdose of **amitriptyline**. On presentation, she is lethargic with a blood pressure of 88/54 mmHg, heart rate of 124 beats per minute, and dry mucous membranes. The bedside **ECG** reveals a QRS duration of 145 milliseconds. Which of the following is the primary mechanism responsible for this cardiac finding? * A. Beta-adrenergic receptor stimulation * B. Fast sodium channel blockade * C. Voltage-gated calcium channel activation * D. Muscarinic M1 receptor stimulation Pause. Best answer: B. Fast sodium channel blockade Why it is correct: **TCA** cardiotoxicity is primarily driven by the blockade of fast sodium channels in the cardiac conduction system. This slows phase 0 depolarization, causing QRS widening, conduction delay, and potential ventricular arrhythmias. Why the other choices are wrong: * A. **TCAs** do not stimulate beta-adrenergic receptors; they block alpha-1 adrenergic receptors, causing vasodilation and hypotension. * B. Correct choice. * C. **TCAs** do not activate voltage-gated calcium channels; their primary cardiac toxicities stem from sodium and potassium channel inhibition. * D. Muscarinic M1 receptor blockade causes anticholinergic signs like sinus tachycardia and dry mouth, but does not cause QRS widening. Test-taking pearl: QRS widening in **TCA** overdose is caused by sodium channel blockade, and a QRS duration greater than 100 milliseconds is a key trigger for intravenous sodium bicarbonate administration. Concept tested: Pathophysiology of TCA cardiotoxicity and QRS prolongation. Active Recall Checkpoints. 1. What baseline diagnostic test must be performed before starting any patient on a **tricyclic antidepressant**? 2. What QRS duration threshold on an **ECG** indicates a high risk for seizures in **TCA** overdose? 3. What QRS duration threshold indicates a high risk for life-threatening ventricular arrhythmias in **TCA** overdose? 4. What receptor blockade is responsible for **TCA** induced orthostatic hypotension? 5. What is the emergency pharmacological treatment of choice for **TCA** induced cardiotoxicity and QRS prolongation? Next Study Step. Review **Fitzgerald Chapter 2: Select Specialty Topics in Psychiatric-Mental Health Practice** and **Fitzgerald Chapter 14: Older Adults** for comprehensive medical rule-outs, drug-induced metabolic monitoring, and geriatric prescribing safety. Next. Topic. Lithium Cardiac Impacts. Note: Fitzgerald Chapter 18 (Disorders Revealed by the Cardiac Exam) is not contained in the uploaded workbook scans and transcripts in this notebook. However, complete high-yield clinical content regarding **lithium** cardiac findings is provided across the available Fitzgerald review sources in this notebook. Bottom Line Summary. * Obtain baseline **ECG**, serum creatinine, **eGFR**, **BUN**, **TSH**, and serum **hCG** prior to initiating **lithium** therapy. * **Lithium** induces benign, reversible T-wave flattening or T-wave inversion on **ECG** in up to 30 percent of patients at therapeutic doses. * **Lithium** depresses sinus node automaticity, creating risks for sinus bradycardia, sinoatrial block, or AV block in susceptible individuals. * First-trimester pregnancy exposure to **lithium** increases the risk of **Ebstein anomaly**, a severe congenital tricuspid valve malformation. * Therapeutic serum levels range from 0.6 to 1.2 mEq/L for maintenance, while levels at or above 1.5 mEq/L cause toxic cardiac and neurological manifestations. * Adjusting **lithium** dosing in an established diagnosis of **bipolar disorder** is classified as tertiary prevention. Must Know Board Concepts and Clinical Signposts. Safety Alert. * First-trimester pregnancy exposure to **lithium** carries a high-yield board risk for **Ebstein anomaly**, characterized by downward displacement of the tricuspid valve into the right ventricle and right atrial enlargement. * Severe toxicity with a serum level at or above 1.5 to 2.0 mEq/L can trigger sinus node arrest, severe bradycardia, ventricular arrhythmias, and profound neurological collapse. Board Trap. * Mistaking benign T-wave flattening or inversion on **ECG** for acute myocardial ischemia, leading to unnecessary emergency referrals or premature discontinuation of **lithium**. * Failing to order a baseline **ECG** before prescribing **lithium**, which misses pre-existing sick sinus syndrome or conduction blocks. First-Line. * **Lithium** remains a first-line mood stabilizer for acute mania and maintenance in **bipolar I disorder**, provided baseline cardiac, renal, thyroid, and pregnancy screening is completed first. Cardiac Findings and Laboratory Workup Synthesis. * Baseline cardiac and metabolic evaluation: Before starting **lithium**, order an **ECG** to evaluate baseline rhythm and conduction, along with renal function tests (**eGFR** and creatinine), thyroid panel (**TSH**), serum electrolytes, and pregnancy test (**hCG**). * Conduction effects: **Lithium** replaces intracellular potassium in cardiac myocytes, altering repolarization. This produces benign T-wave flattening or inversion on **ECG**, while depressing sinus node pacemaking function. * High-risk populations: Older adults and patients with underlying sick sinus syndrome or AV node disease face heightened risk for severe sinus bradycardia and sinoatrial block when taking **lithium**. Sample Board Practice Questions. Question 1. A 28-year-old female with **bipolar I disorder** is being evaluated for initiation of **lithium** therapy. She is currently sexually active and uses barrier contraception inconsistently. Which baseline diagnostic tests must be completed prior to initiating **lithium**? * A. **ECG**, serum creatinine, **TSH**, and serum **hCG** * B. Liver function tests, **CBC**, and serum lipid panel * C. Lipid panel, **HbA1c**, and fasting blood glucose * D. Brain **MRI**, **EEG**, and serum prolactin level Pause. Answer: A. Why it is correct: Baseline evaluation prior to starting **lithium** requires an **ECG** to check cardiac conduction, serum creatinine and **eGFR** to evaluate renal clearance, **TSH** to establish baseline thyroid function, and a serum **hCG** to rule out pregnancy due to the risk of **Ebstein anomaly**. Why the other choices are wrong: * A is correct. * B is incorrect because liver function tests and **CBC** are baseline requirements for **valproate** or **carbamazepine**, not primary baseline requirements for **lithium**. * C is incorrect because lipid panels and **HbA1c** are baseline requirements for second-generation antipsychotics due to metabolic syndrome risk. * D is incorrect because routine neuroimaging and **EEG** are not required prior to **lithium** initiation unless focal neurological deficits or seizures are present. Question 2. A 52-year-old male taking **lithium** 900 mg daily for **bipolar I disorder** presents for a routine follow-up. A routine **ECG** shows benign T-wave inversion without ST-segment changes. The patient is asymptomatic with a normal heart rate and a therapeutic serum **lithium** level of 0.8 mEq/L. What is the most appropriate PMHNP action? * A. Immediately discontinue **lithium** and transfer the patient to the emergency department * B. Reassure the patient that T-wave inversion is a common benign **ECG** change associated with **lithium** and continue current therapy * C. Order an emergency cardiac catheterization * D. Increase the **lithium** dosage to 1200 mg daily Pause. Answer: B. Why it is correct: **Lithium** commonly produces benign and reversible T-wave flattening or inversion on **ECG** at therapeutic doses, which does not require drug discontinuation in an asymptomatic patient with normal serum levels. Why the other choices are wrong: * A is incorrect because immediate discontinuation and emergency transfer are unnecessary for benign T-wave changes without ischemic symptoms or toxicity. * B is correct. * C is incorrect because invasive cardiac catheterization is not indicated for isolated benign T-wave inversion related to **lithium** therapy. * D is incorrect because increasing the dose is inappropriate and could induce sinus node dysfunction or toxicity. Question 3. Adjusting the **lithium** dosage for a 35-year-old man with **bipolar disorder** who was recently hospitalized for a manic episode represents which level of health prevention? * A. Primary prevention * B. Secondary prevention * C. Tertiary prevention * D. Anticipatory guidance Pause. Answer: C. Why it is correct: Adjusting medication dosage in a patient with an established diagnosis of **bipolar disorder** to maintain therapeutic stability and prevent disease complications represents tertiary prevention. Why the other choices are wrong: * A is incorrect because primary prevention aims to prevent the initial onset of disease in healthy individuals. * B is incorrect because secondary prevention focuses on early screening and disease detection in asymptomatic individuals. * C is correct. * D is incorrect because anticipatory guidance is a health promotion strategy, not a level of disease outcome management. Next Study Step. * Review **Fitzgerald Chapter 2** (Select Specialty Topics) for comprehensive coverage of laboratory baselines, **CYP450** drug interactions, and metabolic monitoring parameters. Next. Topic. Anorexia Nervosa Cardiovascular Signs. Anorexia Nervosa Cardiovascular Signs. Bottom Line Summary. * **Anorexia Nervosa** causes severe, life-threatening cardiovascular complications due to starvation-induced myocardial atrophy, autonomic dysregulation, and electrolyte depletion. * Cardinal cardiovascular signs include **sinus bradycardia** with a resting heart rate below 50 beats per minute, **hypotension** with blood pressure below 90/60 mmHg, and **QTc prolongation** on ECG. * Functional **mitral valve prolapse** occurs in up to 30 percent to 60 percent of severe cases due to a disproportion between a shrunken left ventricle and normal valve leaflet size. * Electrolyte derangements, specifically **hypokalemia** and **hypomagnesemia** from starvation or purging, drive **QTc prolongation** and fatal ventricular arrhythmias like Torsades de Pointes. * Immediate medical hospitalization is indicated when resting heart rate drops below 40 beats per minute, blood pressure drops below 90/60 mmHg, temperature falls below 36 degrees Celsius (96.8 degrees Fahrenheit), or QTc interval exceeds 450 milliseconds. * **Bupropion** is strictly contraindicated in eating disorders due to an elevated risk of drug-induced seizures. * Most cardiac manifestations, including **sinus bradycardia**, **hypotension**, and functional **mitral valve prolapse**, resolve with gradual nutritional restoration and weight recovery. High-Yield Clinical Teaching. **Pathophysiology of Myocardial Atrophy** Severe malnutrition forces the body to catabolize cardiac protein, leading to decreased left ventricular wall thickness and reduced heart chamber volume. This structural wasting directly reduces stroke volume and overall cardiac output. **Autonomic Dysregulation and Vital Sign Depression** Increased vagal tone acts as a compensatory energy-conserving adaptation, manifesting as resting **sinus bradycardia** and **hypotension**. Orthostatic changes signal significant intravascular volume depletion. **Electrophysiological Instability** Electrolyte shifts, especially **hypokalemia** and **hypomagnesemia**, impair ventricular repolarization. This prolongs the **QTc interval** on electrocardiography, creating a substrate for lethal arrhythmias. **Functional Valvular Changes** As left ventricular myocardial volume shrinks, the mitral valve leaflets become disproportionately large for the diminished chamber, causing a mid-systolic click and late systolic murmur characteristic of **mitral valve prolapse**. Signposts and Board Pearls. **Safety alert** A resting heart rate under 40 beats per minute, systolic blood pressure under 90 mmHg, body temperature under 36 degrees Celsius (96.8 degrees Fahrenheit), QTc interval over 450 milliseconds, or body weight under 75 percent of ideal body weight demands immediate emergency medical hospitalization. **Board trap** Do not prescribe psychotropic medications or stimulants to treat lethargy or low mood in a patient with active **anorexia nervosa** prior to obtaining a baseline ECG and stabilizing vital signs. Remember that **bupropion** is strictly contraindicated due to seizure risk. **First-line** The **first-line** management strategy for cardiovascular signs in **anorexia nervosa** is cautious, multidisciplinary nutritional restoration and medical stabilization. Daily electrolyte monitoring is essential during refeeding to prevent refeeding syndrome and acute heart failure. Spoken Review of Cardiac Findings and Monitoring. When evaluating cardiovascular signs in eating disorders, group and compare findings across physical exam and lab markers. Physical exam findings group into vital sign depression and structural murmur signs. Vital sign depression features resting **sinus bradycardia** below 50 beats per minute, **hypotension** under 90/60 mmHg, hypothermia under 36 degrees Celsius, and orthostatic blood pressure drops exceeding 20 mmHg. Structural murmur signs present as a late systolic click or mid-to-late systolic murmur caused by **mitral valve prolapse** secondary to myocardial tissue wasting. Diagnostic testing groups into electrocardiogram tracings and serum electrolyte panels. Electrocardiogram tracings demonstrate **QTc prolongation** exceeding 450 milliseconds in females or 440 milliseconds in males, low voltage QRS complexes, and T-wave inversions. Serum electrolyte panels reveal **hypokalemia**, **hypomagnesemia**, and **hypophosphatemia**, which directly provoke ventricular arrhythmias. Comparing outpatient versus emergency thresholds clarifies the level of care decision: * Outpatient management is appropriate when resting heart rate remains above 50 beats per minute, systolic blood pressure stays above 90/60 mmHg, and body weight is above 85 percent of ideal body weight. * Immediate inpatient medical hospitalization is required when resting heart rate drops below 40 beats per minute, systolic blood pressure drops below 90 mmHg, QTc interval exceeds 450 milliseconds, or body weight falls below 75 percent of ideal body weight (or BMI is below 15). Sample Board Practice Questions. Question 1. A 17-year-old female is brought to the clinic by her parents due to severe weight loss, restrictive eating, and amenorrhea for the past 5 months. Physical examination reveals a body mass index of 14.2, dry skin, lanugo, and a resting heart rate of 38 beats per minute. Blood pressure is 82/54 mmHg. An electrocardiogram shows sinus bradycardia with a QTc interval of 468 milliseconds. What is the most appropriate next management step? A. Initiate fluoxetine at 20 mg daily and schedule an outpatient follow-up in one week. B. Refer the patient immediately to the emergency department for medical inpatient admission. C. Prescribe bupropion to improve energy levels and appetite. D. Recommend family-based psychotherapy and recheck vital signs in 1 month. Pause. Answer: B. Why it is correct: Immediate medical inpatient hospitalization is required when a patient with **anorexia nervosa** exhibits life-threatening physiological instability, defined as a resting heart rate below 40 beats per minute, systolic blood pressure below 90 mmHg, or a prolonged QTc interval. Why the other choices are wrong: * A: Outpatient pharmacotherapy with **fluoxetine** is unsafe and ineffective when severe physical and cardiac instability requires emergency medical stabilization. * C: **Bupropion** is strictly contraindicated in patients with **anorexia nervosa** or bulimia nervosa due to an increased risk of severe seizures. * D: Delaying care for outpatient family therapy when vital signs demonstrate severe bradycardia and QTc prolongation places the patient at imminent risk of sudden cardiac death. Question 2. A 22-year-old female student with a 3-year history of **anorexia nervosa** restricting type presents for a routine psychiatric evaluation. Cardiac auscultation reveals a mid-systolic click followed by a late systolic murmur at the apex. Echocardiography confirms mild **mitral valve prolapse**. Which statement best describes the primary etiology and management of this physical finding? A. The murmur indicates permanent rheumatic valvular damage requiring immediate prophylactic antibiotic coverage. B. The valve prolapse results from starvation-induced myocardial atrophy and typically resolves after nutritional restoration and weight gain. C. The patient requires immediate surgical valve replacement before beginning psychiatric treatment. D. The finding is caused by stimulant toxicity and requires starting beta-blocker therapy. Pause. Answer: B. Why it is correct: In severe **anorexia nervosa**, cardiac muscle wasting shrinks the left ventricular cavity, causing the normal-sized mitral valve leaflets to buckle into the left atrium during systole. This functional **mitral valve prolapse** typically regresses as cardiac muscle mass is restored through adequate nutrition. Why the other choices are wrong: * A: Mitral valve prolapse in **anorexia nervosa** stems from starvation-induced cardiac tissue wasting rather than infectious or rheumatic heart disease. * C: Structural valve surgery is not indicated because the condition is functional and reversible with weight restoration. * D: The finding is related to malnutrition and left ventricular chamber shrinkage, not stimulant toxicity or primary catecholamine excess. Next. Topic. Bulimia Nervosa Cardiac Complications. Source Scope and Verification. Fitzgerald Chapter 18 (Disorders Revealed by the Cardiac Exam) and specific text titled Bulimia Nervosa Cardiac Complications are not present in the provided notebook sources [1-3]. The provided Fitzgerald review materials cover Chapters 1 through 16 along with board prep prequels [1-3]. The following study guide synthesizes all available source-grounded cardiac findings, psychotropic monitoring rules, levels of prevention, and medical rule-outs from the provided Fitzgerald course materials [4-7]. Bottom Line Summary. * **Safety alert**: ANCC and AANPCB board exams evaluate cardiovascular and body system considerations across all domains, representing up to 22% of scientific foundation items [4, 6, 8]. * **First-line**: Baseline ECG, eGFR, serum creatinine, and TSH are required prior to initiating lithium therapy [9, 10]. * **Safety alert**: Citalopram is capped at a maximum daily dose of 20 mg in adults aged 60 and older due to dose-dependent QTc prolongation risk. * **Safety alert**: Clozapine carries FDA black box warnings for myocarditis and cardiomyopathy, requiring immediate drug cessation if dyspnea, fever, chest pain, or palpitations develop. * **Board trap**: Tricyclic antidepressants require baseline ECG and ongoing monitoring because overdose carries a high risk of fatal ventricular arrhythmias and heart block. * **Board trap**: Do not diagnose a primary anxiety or panic disorder without first ruling out medical cardiovascular mimics such as myocardial infarction, pulmonary embolism, or pheochromocytoma [9, 10]. * **First-line**: Intervene at the lowest level of prevention possible; screening for asymptomatic disease is secondary prevention, while adjusting psychotropics to prevent target organ damage is tertiary prevention [7, 11-13]. * **Safety alert**: Severe eating disorders and purge behaviors cause autonomic hyperarousal, sinus bradycardia, hypotension, and electrolyte disturbances that trigger cardiac arrhythmias [14, 15]. Cardiac Findings and Psychopharmacology Monitoring. Four major psychotropic medication classes require strict baseline cardiac and lab monitoring in advanced practice nursing. Tricyclic antidepressants require a baseline ECG to detect underlying conduction defects, heart block, and QTc prolongation before prescribing. Citalopram requires strict age-adjusted dosing capped at 20 mg daily in adults over 60 to prevent dose-dependent QTc prolongation and Torsades de Pointes. Clozapine requires vigilance for fatal cardiac adverse events, specifically myocarditis and cardiomyopathy, which warrant immediate drug discontinuation upon presentation of unexplained fatigue, dyspnea, chest pain, or fever. Lithium requires a comprehensive baseline panel including an ECG, renal function testing with eGFR and serum creatinine, a TSH panel, and pregnancy screening prior to starting therapy [9, 10]. Levels of Prevention in Cardiac and Psychiatric Care. Three distinct levels of prevention govern clinical decision-making on board exams [5, 7, 13, 16]. Primary prevention focuses on preventing illness before it occurs, such as educating patients on cardiovascular health, exercise, or stress reduction [7, 16]. Secondary prevention focuses on early screening and detection in asymptomatic individuals, such as checking blood pressure, ordering lipid panels, or administering screening tools like the PHQ-9 [5, 7, 17]. Tertiary prevention focuses on managing established disease to prevent further target organ damage, such as adjusting lithium or antipsychotic dosages in a diagnosed patient [5, 13, 17]. Medical Mimics and Cardiac Differential Diagnosis. Before confirming a primary psychiatric diagnosis like panic disorder or generalized anxiety, rule out medical and cardiovascular mimics [9, 10]. Acute cardiovascular conditions like myocardial infarction, pulmonary embolism, arrhythmias, and pheochromocytoma present with autonomic hyperarousal, tachycardia, chest tightness, and shortness of breath [9, 10]. Always assess physical safety and vital signs initial to initiating psychotropic pharmacotherapy [9, 10]. Board Practice Question Bank. Question 1. A 35-year-old man with bipolar disorder was recently hospitalized for a manic episode. On returning to work as an accountant in a large company, he accesses his company's employee assistance program (EAP) to facilitate his return to work. This is an example of which prevention strategy? - A) Primary prevention - B) Secondary prevention - C) Tertiary prevention - D) Anticipatory guidance Pause. **Answer**: C. **Why It Is Correct**: The patient has an established illness (bipolar disorder) and recent hospitalization. Utilizing employee assistance programs to support rehabilitation and prevent relapse represents tertiary prevention [18, 19]. **Why the Other Choices Are Wrong**: - **A**: Primary prevention prevents disease onset before it occurs, such as immunizations or health education [7, 16]. - **B**: Secondary prevention involves screening and early detection in asymptomatic individuals, such as blood pressure checks [5, 7]. - **D**: Anticipatory guidance is a proactive educational strategy rather than a disease prevention classification [18, 19]. **Test-Taking Pearl**: Managing established disease or preventing complications in a diagnosed patient is always tertiary prevention [5, 13]. Question 2. In evaluating a 25-year-old patient with stable depression and a strong family history of type 2 diabetes, the PMHNP orders a baseline lipid profile and fasting blood glucose. This intervention is an example of which level of prevention? - A) Primary prevention - B) Secondary prevention - C) Tertiary prevention - D) Health promotion Pause. **Answer**: B. **Why It Is Correct**: Ordering lab screenings like lipid profiles or glucose checks in an asymptomatic patient to detect early metabolic disease is secondary prevention [20, 21]. **Why the Other Choices Are Wrong**: - **A**: Primary prevention averts disease development entirely through education or vaccines [7, 16]. - **C**: Tertiary prevention manages existing complications of an already diagnosed disease [5, 13]. - **D**: Health promotion is a component of primary prevention aimed at general wellness rather than specific screening [7, 16]. **Test-Taking Pearl**: Any action involving screening, baseline labs, or early detection represents secondary prevention [5, 7, 21]. Next Study Step. Review **Fitzgerald Chapter 2 (Select Specialty Topics)** and **Fitzgerald Chapter 14 (Older Adults)** to master laboratory baselines, ECG monitoring guidelines, and medical rule-outs. 💡 Would you like to review practice questions on psychotropic ECG monitoring or medical rule-outs for anxiety? Next. New section. QT prolongation, myocarditis, orthostasis, and drug-cardiac maps. Topic. QT Prolongation Risk Profile. Source Availability Notice. Fitzgerald Chapter 18 (Disorders Revealed by the Cardiac Exam) is not present as a standalone chapter scan in the provided notebook materials, which cover Chapters 1 through 16. However, high-yield cardiac risk profiles, **QTc prolongation** rules, **myocarditis** warnings, and drug-cardiac maps are detailed across Fitzgerald review Chapters 2, 8, 9, 10, and 14 in this notebook. Bottom Line Summary. * **Citalopram** has an FDA dose ceiling of **20 mg** daily in adults aged **60 years and older** (and poor **CYP2C19** metabolizers) due to dose-dependent **QTc prolongation** and **Torsades de Pointes** risk. * **Tricyclic antidepressants** (**TCAs**) cause **QTc prolongation**, heart block, and lethal ventricular arrhythmias in overdose by blocking cardiac fast sodium channels. A baseline **electrocardiogram** (**ECG**) is mandatory before starting **TCAs**. * **Clozapine** carries a black box warning for **myocarditis** and **cardiomyopathy**, which most often develops during the first **6 weeks** of treatment. Immediate cessation is required for unexplained fever, chest pain, dyspnea, tachycardia, or fatigue. * **Thioridazine** and intravenous **haloperidol** carry the highest **QTc prolongation** risk among antipsychotics. Other notable high-risk agents include **ziprasidone**, **pimozide**, and **methadone**. * **Lithium** requires a baseline **ECG** along with renal (**eGFR**, serum creatinine), thyroid (**TSH**), and pregnancy testing due to potential sinus node dysfunction. * **Anorexia nervosa** causes severe physical cardiovascular complications including **sinus bradycardia**, **hypotension**, **QTc prolongation**, and **mitral valve prolapse**. * **Orthostatic hypotension** results primarily from **alpha-1 adrenergic blockade** caused by low-potency first-generation antipsychotics, **TCAs**, and second-generation antipsychotics like **clozapine** and **quetiapine**. High-Yield Concept Map and Drug-Cardiac Profiles. QTc Prolongation Risk Profile. * **Safety alert**: Normal QTc intervals are under **450 ms** for men and **470 ms** for women. A QTc interval exceeding **500 ms** or an increase greater than **60 ms** from baseline represents an extreme hazard for **Torsades de Pointes** and sudden cardiac death. * **First-line**: Assess baseline cardiac history, personal or family history of syncope or sudden death, serum potassium, and serum magnesium before starting high-risk psychotropics. Citalopram. * **What it is**: An **SSRI** antidepressant. * **Why boards care**: It exhibits dose-dependent **QTc prolongation**. * **First-line**: Cap **citalopram** at **20 mg** daily for adults over age **60**, patients with hepatic impairment, or poor **CYP2C19** metabolizers. Maximum dose in younger adults is **40 mg** daily. * **Board trap**: Choosing **citalopram** **40 mg** daily for an elderly patient with major depression. The correct choice is capping at **20 mg** or selecting **sertraline** or **escitalopram**. Tricyclic Antidepressants (TCAs). * **What it is**: Non-selective monoamine reuptake inhibitors including **amitriptyline**, **nortriptyline**, and **imipramine**. * **Why boards care**: High cardiotoxicity and lethality in overdose. * **Safety alert**: **TCAs** slow cardiac conduction, widening the QRS complex and prolonging the QTc interval, leading to heart block and fatal ventricular arrhythmias. * **First-line**: Obtain a baseline **ECG** in all patients prior to initiating **TCAs**. Clozapine. * **What it is**: A second-generation antipsychotic (**SGA**) for treatment-resistant **schizophrenia**. * **Why boards care**: Multiple black box warnings including **agranulocytosis**, **seizures**, **myocarditis**, and orthostasis. * **Safety alert**: **Myocarditis** presents during the first **6 weeks** of therapy with unexplained fever, chest pain, dyspnea, palpitations, or fatigue. * **First-line**: Discontinue **clozapine** immediately if **myocarditis** or **cardiomyopathy** is suspected and refer to the emergency department. Anorexia Nervosa Cardiovascular Features. * **What it is**: An eating disorder characterized by severe restriction and low body mass. * **Why boards care**: Severe physical and cardiac instability. * **Must-know features**: Starvation causes **sinus bradycardia**, **hypotension**, **QTc prolongation**, and **mitral valve prolapse**. * **First-line**: Inpatient hospitalization is required if heart rate is below **40 bpm**, blood pressure is below **90/60 mmHg**, or severe cardiac arrhythmias occur. Compare and Distinguish. Citalopram vs. Sertraline in Older Adults * **Do not confuse**: Both are effective **SSRIs**, but their cardiac safety boundaries differ in late-life depression. * **Think Citalopram when**: Dosing must be capped at **20 mg** daily in patients over age **60** due to QTc prolongation risks. * **Think Sertraline when**: Preferred first-line **SSRI** in older adults or post-myocardial infarction patients due to minimal QTc impact. * **Priority difference**: **Citalopram** has a strict FDA dose ceiling in older adults; **sertraline** lacks this specific QTc restriction. Myocarditis vs. Neuroleptic Malignant Syndrome on Clozapine * **Do not confuse**: Both cause fever and tachycardia in a patient taking an antipsychotic. * **Think Myocarditis when**: Chest pain, dyspnea, elevated troponin, and fatigue develop within the first **6 weeks** of starting **clozapine**. * **Think NMS when**: Severe lead-pipe muscle rigidity, autonomic instability, diaphoresis, and elevated **CK** occur. * **Priority difference**: **Myocarditis** directly inflames cardiac muscle tissue; **NMS** presents with generalized muscular rigidity and hyperthermia. Board-Style Practice Questions. Question 1. A 68-year-old female with major depressive disorder is being evaluated for antidepressant therapy. Her medical history is unremarkable except for mild hypertension. Which prescribing decision represents the safest standard of care? * A) Initiate **citalopram** at **40 mg** daily. * B) Initiate **citalopram** at **20 mg** daily. * C) Initiate **amitriptyline** at **50 mg** daily without baseline studies. * D) Initiate **thioridazine** at **25 mg** daily. Pause. Answer: B Quick Answer. Initiate **citalopram** at **20 mg** daily because the FDA limits **citalopram** to a maximum of **20 mg** per day in adults over age **60** to prevent **QTc prolongation**. Key Clue. Age **68** and antidepressant selection. Best Answer. B. Initiate **citalopram** at **20 mg** daily. Why It Is Correct. The FDA issued a drug safety communication capping **citalopram** at **20 mg** daily in adults aged **60 years and older** due to the risk of dose-dependent **QTc prolongation**, **Torsades de Pointes**, and sudden cardiac death. Why the Other Choices Are Wrong. * **A:** Citalopram **40 mg** daily exceeds the maximum recommended dose for patients over age **60** and elevates **QTc prolongation** risk. * **B:** Correct choice. * **C:** Amitriptyline is a **TCA** that carries high cardiotoxicity, anticholinergic side effects, and orthostasis risks in older adults, requiring a baseline **ECG**. * **D:** Thioridazine is a first-generation antipsychotic with a black box warning for **QTc prolongation** and is not indicated for uncomplicated major depressive disorder. Test-Taking Pearl. Always cap **citalopram** at **20 mg** daily in patients over age **60** or poor **CYP2C19** metabolizers on board exams. Question 2. A 34-year-old male with treatment-resistant **schizophrenia** started **clozapine** 4 weeks ago. Today he presents with fever, pleuritic chest pain, shortness of breath, and fatigue. Vital signs reveal temperature 101.2 F, heart rate 118 bpm, and blood pressure 110/72 mmHg. What is the most appropriate initial PMHNP action? * A) Reassure the patient that these are transient flu-like symptoms. * B) Discontinue **clozapine** immediately and refer for urgent medical evaluation for suspected **myocarditis**. * C) Increase the **clozapine** dose to treat worsening psychosis. * D) Order a routine outpatient **CBC** with absolute neutrophil count for next week. Pause. Answer: B Quick Answer. Discontinue **clozapine** immediately and refer for urgent medical evaluation because the patient presents with classic signs of **clozapine** induced **myocarditis**. Key Clue. New onset fever, chest pain, dyspnea, and tachycardia within the first **6 weeks** of **clozapine** therapy. Best Answer. B. Discontinue **clozapine** immediately and refer for urgent medical evaluation for suspected **myocarditis**. Why It Is Correct. **Clozapine** carries a black box warning for fatal **myocarditis** and **cardiomyopathy**, which most frequently occurs during the first **6 weeks** of treatment. Symptoms of fever, chest pain, dyspnea, and tachycardia require immediate drug cessation and emergency medical workup. Why the Other Choices Are Wrong. * **A:** Reassuring the patient ignores a life-threatening black box cardiac emergency. * **B:** Correct choice. * **C:** Increasing the dose worsens cardiac toxicity and can be fatal. * **D:** Delaying evaluation for a routine lab check next week fails to address acute **myocarditis**. Test-Taking Pearl. Unexplained fever, chest pain, and tachycardia in a patient recently started on **clozapine** indicates **myocarditis** until proven otherwise. Question 3. A 42-year-old female is being evaluated for major depressive disorder. The PMHNP considers prescribing a tricyclic antidepressant. Which diagnostic assessment is mandatory before initiating this medication? * A) Baseline electroencephalogram. * B) Baseline **electrocardiogram**. * C) Baseline chest X-ray. * D) Baseline echocardiogram. Pause. Answer: B Quick Answer. Baseline **electrocardiogram** (**ECG**) is mandatory prior to starting a **TCA** to rule out underlying cardiac conduction abnormalities. Key Clue. Prescribing a **TCA** and mandatory baseline testing. Best Answer. B. Baseline **electrocardiogram** (**ECG**). Why It Is Correct. **TCAs** slow cardiac conduction and can cause QRS widening, **QTc prolongation**, heart block, and fatal ventricular arrhythmias. Obtaining a baseline **ECG** is required to ensure safety prior to initiation. Why the Other Choices Are Wrong. * **A:** An **EEG** evaluates brain electrical activity and is not required for **TCA** initiation. * **B:** Correct choice. * **C:** A chest X-ray evaluates lung and cardiac size but does not assess cardiac conduction intervals. * **D:** An echocardiogram assesses heart valves and ejection fraction but is not the standard mandatory initial baseline tool for **TCA** conduction screening. Test-Taking Pearl. Always order a baseline **ECG** before starting a **TCA** or when evaluating **TCA** overdose risk. Next Study Step. Review **Fitzgerald Chapter 2** (Select Specialty Topics) and **Fitzgerald Chapter 14** (Older Adults) to solidify laboratory baselines, **CYP450** isoenzyme interactions, and medical rule-outs before your board exam. 💡 **Next Study Idea:** Would you like me to generate a 10-question practice set on lab baselines and drug interactions across Fitzgerald Chapters 2 and 14? Next. End of this drive.