Source / episode info
- **Episode:**523
- **Title:**Divine Intervention Episode 523: 2024 USMLE Step 2CK Free 120 Discussion Part 6
- **Published:**2024-03-22
- Source:Episode page
One-liner
This episode provides a comprehensive review of high-yield clinical scenarios, emphasizing the differential diagnosis for acute mono-like syndromes (HIV/CMV), managing rhabdomyolysis and AKI, recognizing drug toxicities (lithium, Bactrim), assessing vascular status (PAD, trauma), and understanding reproductive anatomy anomalies.
High-yield summary
- Acute Mono-like Syndrome: In a patient with fever, pharyngitis, myalgia, fatigue, anemia, and leukopenia, the most appropriate initial step is HIV RNA PCR testing to rule out Acute Retroviral Syndrome (ARS).
- Rhabdomyolysis: Muscle injury leading to elevated CK causes acute tubular necrosis (ATN) due to myoglobin precipitation in renal tubules. Treatment requires aggressive IV fluid resuscitation.
- Lithium Toxicity: Symptoms of toxicity (confusion, seizures, GI upset) are often exacerbated by dehydration or excessive sun exposure, leading to impaired free water excretion and potentially life-threatening hyponatremia.
- Peripheral Artery Disease (PAD): Screening for PAD in smokers with risk factors (e.g., claudication symptoms, absent pulses) should include an Ankle-Brachial Index (ABI) measurement; routine screening is recommended even without classic symptoms.
- Drug Interactions: Antibiotics like Bactrim (TMP/SMX) can cause drug-drug interactions by inhibiting CYP enzymes (e.g., CYP2C9), leading to supratherapeutic levels of anticoagulants (Warfarin).
- Orthopedic Trauma: The Ottawa Ankle Rules are a critical algorithm for determining the need for X-ray imaging following ankle trauma, requiring assessment of weight-bearing status and tenderness over specific bony landmarks.
Learning objectives
- Differentiate between various causes of acute mono-like syndromes and determine appropriate diagnostic testing for HIV infection.
- Recognize the pathophysiology, clinical presentation, and management priorities in rhabdomyolysis leading to AKI.
- Identify risk factors and signs of drug toxicity (e.g., lithium) that can cause neurological or metabolic derangements.
- Apply knowledge of congenital anomalies to predict associated reproductive tract defects.
- Master key diagnostic algorithms for acute musculoskeletal trauma, specifically the Ottawa Ankle Rules.