Cardiomyopathies & Sudden Cardiac Death Risk
Recognize major cardiomyopathy phenotypes, identify reversible causes and detect patients at risk of malignant arrhythmia or sudden death.
Module format: each study session covers what to learn, how the presentation appears clinically, investigation/management priorities, safety issues and common MCCQE traps.
Module 8 — Topic map
- Dilated cardiomyopathy: ischemic, toxic, infectious, peripartum and genetic causes
- Hypertrophic cardiomyopathy: murmur behavior, exertional symptoms and family history
- Restrictive cardiomyopathy and infiltrative causes
- Arrhythmogenic cardiomyopathy and ventricular arrhythmia clues
- Stress (Takotsubo) cardiomyopathy and differentiation from ACS
- Family screening and inherited cardiac disease principles
- Sudden cardiac death risk, warning symptoms and device/referral concepts
Chronic CareAssessment / DiagnosisRisk stratificationPrevention
Study Session 8.1 — Dilated & Restrictive Cardiomyopathy
Focused MCCQE cardiovascular study session
Core topics & learning goals
- Recognize DCM presentation with systolic HF, arrhythmia or thromboembolism.
- Identify ischemic, alcohol/toxic, viral, peripartum, genetic and tachycardia-mediated causes.
- Recognize restrictive physiology and infiltrative causes such as amyloid.
- Use echo and targeted etiologic testing.
Clinical recognition & investigation
- Assess family history and reversible causes.
- Differentiate restrictive cardiomyopathy from constrictive pericarditis.
Management & patient-safety priorities
- Treat HF and arrhythmia; stop cardiotoxins and refer genetic/specialist cases.
- Assess device/advanced-therapy needs.
MCCQE exam traps
- Do not assume all DCM is idiopathic.
- Restrictive physiology may preserve EF despite severe symptoms.
Study Session 8.2 — Hypertrophic Cardiomyopathy
Focused MCCQE cardiovascular study session
Core topics & learning goals
- Recognize exertional dyspnea, chest pain, syncope and family history of sudden death.
- Understand dynamic LV outflow obstruction and murmur response to preload/afterload changes.
- Use ECG/echo and family screening.
- Know major sudden-death risk markers conceptually.
Clinical recognition & investigation
- Treat exertional syncope as a red flag.
- Distinguish HCM from athlete’s heart and hypertensive LVH.
Management & patient-safety priorities
- Use specialist-directed symptom therapy and consider ICD for selected high-risk patients.
- Advise on exercise/activity after individualized expert assessment.
MCCQE exam traps
- Reducing preload can worsen dynamic obstruction.
- A young person with exertional syncope requires cardiac evaluation even if symptoms resolved.
Study Session 8.3 — Arrhythmogenic / Stress Cardiomyopathy & Inherited Risk
Focused MCCQE cardiovascular study session
Core topics & learning goals
- Recognize arrhythmogenic cardiomyopathy with ventricular arrhythmia and family history.
- Recognize stress (Takotsubo) cardiomyopathy as an ACS mimic.
- Understand inherited channelopathy/cardiomyopathy clues.
- Know when first-degree relatives need screening.
Clinical recognition & investigation
- Exclude ACS appropriately in suspected stress cardiomyopathy.
- Ask about unexplained sudden deaths, drowning, seizures or exertional collapse in relatives.
Management & patient-safety priorities
- Refer inherited disease to cardiology/genetics.
- Manage ventricular arrhythmia/sudden-death risk appropriately.
MCCQE exam traps
- Takotsubo is a diagnosis requiring exclusion of competing acute coronary causes.
- “Seizure” history can occasionally represent arrhythmic syncope.