Source / episode info
- **Episode:**583
- **Title:**DIP Ep 583: 2025 USMLE Step 1 Free 120 Discussion Part 3 (Q21-30, super helpful for Step 2 and 3!)
- **Published:**2025-03-19
- Source:Episode page
One-liner
This episode reviews critical board topics including MI cardiac function curve interpretation (CO , EDV ), recognizing manic psychosis using the DIGNFAST mnemonic, understanding BPH pathophysiology via DHT synthesis, and identifying physical exam signs of pneumothorax.
High-yield summary
- MI Physiology: Acute myocardial injury causes decreased contractility, leading to a drop in cardiac output (CO) and subsequent accumulation of blood, which increases end-diastolic volume (EDV).
- Mania/Psychosis: The DIGNFAST mnemonic helps recall key symptoms of mania: Distractibility, Impulsivity, Grandiosity, Flight of Ideas, Activity Increase, Sleep deprivation, Talkativeness.
- BPH Pathophysiology: Prostate enlargement is primarily driven by the conversion of testosterone to dihydrotestosterone (DHT) via the enzyme 5-reductase. Inhibiting this pathway (e.g., with Finasteride) shrinks the prostate.
- Pneumothorax Exam: The classic physical exam findings are decreased breath sounds and hyperresonance to percussion on the affected side due to air accumulation in the pleural space.
- Ethical Disclosure: When delivering a devastating diagnosis (e.g., Down syndrome), only disclose the most critical, actionable information initially to prevent parental distress and ensure comprehension.
Learning objectives
- Interpret the physiological changes in cardiac output and end-diastolic volume following an acute MI.
- Recognize the signs and symptoms of a manic episode using mnemonic devices (DIGNFAST).
- Identify the primary hormonal mechanism driving Benign Prostatic Hyperplasia (BPH) and appropriate pharmacological interventions.
- Correlate physical exam findings (breath sounds, percussion) with pneumothorax.
- Apply ethical principles regarding the disclosure of serious medical diagnoses to families.
Board exam buzzwords