Source / episode info
- **Episode:**142
- **Title:**Divine Intervention Episode 142 – Comprehensive USMLE Step 1 Repro Review (Part 1 of 2)
- **Published:**2019-08-25
- Source:Episode page
One-liner
Episode 142 provides a massive integration review covering renal tubular physiology (RTA), adrenal axis disorders (Addison's vs. Cushing's), GI ischemia/inflammation, and cardiovascular emergencies like MI complications and source identification for emboli.
High-yield summary
- Adrenal Insufficiency: Primary AI (Addison's) involves aldosterone deficiency -> hyperkalemia, hyponatremia, metabolic acidosis; secondary AI is due to ACTH deficiency -> cortisol deficiency only.
- Renal Tubular Acidosis (RTA): Distinguish types by urine pH and handling of bicarbonate/potassium (e.g., Type 1 RTA causes severe hypokalemia and metabolic acidosis).
- Acute Mesenteric Ischemia: Most common source is embolic, often from atrial fibrillation; the classic finding is disproportionate abdominal pain relative to physical exam findings.
- Prostate Cancer Metastases: Bone metastases are typically osteoblastic/sclerotic (e.g., prostate) rather than purely osteoblastic/sclerotic (e.g., multiple myeloma).
- MI Complications: Must differentiate between cardiogenic shock, tamponade, and tension pneumothorax; always assess for mechanical complications like papillary muscle rupture or ventricular septal defect (VSD).
Learning objectives
- Differentiate between primary and secondary adrenal insufficiency based on electrolyte abnormalities (\text{K}^+, \text{Na}^+).
- Classify different types of Renal Tubular Acidosis (RTA) by their underlying defect in acid/base handling.
- Identify the most common source of embolic material leading to acute limb ischemia or stroke.
- Recognize the classic presentation and initial management steps for acute mesenteric ischemia.
- Correlate cancer type with its typical pattern of bone metastasis (blastic vs. lytic).
Board exam buzzwords