Source / episode info
- **Episode:**316
- **Title:**Divine Intervention Episode 316 – USMLE Step 2CK Rapid Review Series 58.
- **Published:**2021-05-26
- Source:Episode page
One-liner
This episode provides a rapid review covering the side effects of anti-hypertensives (CCBs, ACEi), differentiating hemodynamic profiles in cardiogenic shock versus pulmonary embolism, recognizing patterns in various aplastic anemias, interpreting urine specific gravity for fluid balance disorders, and identifying common presentations of prostate cancer.
High-yield summary
- Calcium Channel Blockers (e.g., Verapamil): Can cause hyperprolactinemia (due to GnRH suppression), constipation (smooth muscle relaxation), and peripheral edema (by dilating pre-capillary arterioles).
- ACE Inhibitors: Their primary site of action is the pulmonary capillaries, where they block Angiotensin Converting Enzyme (ACE). They are vital for preventing hyperfiltration injury in diabetic nephropathy by dilating efferent arterioles.
- Shock Hemodynamics: In PE-induced shock, CVP is high but PCWP is low; conversely, in cardiogenic shock, both PCWP and CVP are elevated due to global failure.
- Aplastic Anemias: Differentiating pure erythroid aplasia (Diamond-Blackfan) from pure granulocytic aplasia (Shwachman-Diamond) and pancytopenia (Fanconi) is critical for diagnosis.
- Fluid/Electrolyte Balance: Urine Specific Gravity (USG) > 1.012 indicates concentrated urine; USG < 1.006 indicates dilute urine, helping differentiate psychogenic polydipsia from DI or SIADH.
Learning objectives
- Differentiate the hemodynamic profiles of cardiogenic shock versus pulmonary embolism (PE) using central and pulmonary pressures.
- Identify drug classes that can cause hyperprolactinemia and list their associated side effects (e.g., CCBs).
- Distinguish between various types of aplastic anemia based on which blood cell line is affected (erythroid, granulocytic, or pancytopenia).
- Interpret urine specific gravity in the context of fluid balance disorders (SIADH vs. psychogenic polydipsia).
- Recognize the classic metastatic pattern and clinical presentation of prostate cancer.
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