Source / episode info
- **Episode:**167
- **Title:**Divine Intervention Episode 167 – USMLE Step 2CK Rapid Review Series 21 (Cardio).
- **Published:**2019-10-11
- Source:Episode page
One-liner
This episode provides a rapid review of core cardiovascular topics, including differentiating murmurs (AS vs HOCM), managing acute coronary syndromes and arrhythmias (WPW, VTAC), diagnosing endocarditis based on risk factors, evaluating peripheral vascular disease (PAD/AAA), and mastering the workup of aortic dissection.
High-yield summary
- Aortic Stenosis (AS) vs. Hypertrophic Cardiomyopathy (HOCM): AS is typically seen in older patients with calcific valve disease; HOCM is more common in younger individuals. Key physical exam differences include the murmur location and radiation, and specific pulse characteristics (pulsus parvus et tardus for AS; pulsus bicuspidus for HOCM).
- Aortic Dissection: The defining feature is whether the dissection involves the ascending aorta (Stanford Type A -> Surgical emergency); if not, it is Type B and managed medically. Beta-blockers are mandatory regardless of type to reduce shear stress.
- Endocarditis Workup: Diagnosis requires considering the source/risk factor: IV drug use strongly suggests Staphylococcus aureus affecting the tricuspid valve; dental procedures suggest subacute endocarditis (e.g., Streptococcus viridans); SLE suggests Libman-Sacks endocarditis.
- Acute Coronary Syndromes (ACS): STEMI requires immediate reperfusion therapy. Unstable Angina/NSTEMI require urgent coronary angiography, as a negative stress test does not rule out disease.
- AAA Screening: Guidelines mandate screening for men over 65 with a history of smoking, or any man over 50 with a family history of AAA.
Learning objectives
- Differentiate the physical exam findings and pathophysiology between aortic stenosis, hypertrophic cardiomyopathy, mitral regurgitation, and mitral valve prolapse.
- Apply appropriate diagnostic workup for acute coronary syndromes (ACS) based on clinical presentation and ECG/troponin status.
- Determine the correct management pathway for Stanford Type A vs. Type B aortic dissection.
- Identify key risk factors and pathogens associated with endocarditis in specific populations (e.g., IVDU, dental).
- Interpret vascular indices (Ankle-Brachial Index, Toe-Brachial Index) to diagnose peripheral arterial disease (PAD).
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