Source / episode info
- **Episode:**593
- **Title:**DIP Ep 593: 2025 USMLE Step 1 Free 120 Discussion Part 10 (Q91-100, super helpful for Step 2 and 3!)
- **Published:**2025-04-18
- Source:Episode page
One-liner
This episode integrates multiple systems, emphasizing the differential diagnosis of joint diseases (OA vs RA), recognizing classic congenital syndromes (Fetal Alcohol Syndrome; Klinefelter syndrome), mastering neurodegenerative drug targets (MAOB inhibitors for PD), and applying advanced knowledge in pharmacology (vasopressors) and immunology (immunodeficiency patterns).
High-yield summary
- Hypoglycemia: Symptoms of hypoglycemia can be rapid and severe, making it a critical diagnosis even when the patient is currently asymptomatic. The cause must be linked to recent changes in insulin dosing or intake.
- Joint Disease Imaging: Osteoarthritis classically presents with asymmetric joint space narrowing, osteophytes, and subchondral sclerosis/cysts; RA causes symmetric narrowing and synovial pannus formation.
- Parkinson's Management: For PD patients whose symptoms are refractory to standard therapy (e.g., carbidopa-levodopa), inhibitors of Monoamine Oxidase B (MAO-B) are indicated, as these drugs prevent the breakdown of dopamine in the CNS.
- Fetal Alcohol Syndrome: The classic triad includes a smooth philtrum, thin vermilion border, and short pop-fiber features; alcohol is the most common teratogen.
- Vasopressors: In severe hypotension (e.g., septic shock), pure _1 agonists like Phenylephrine are preferred because they cause peripheral vasoconstriction leading to a reflex bradycardia, which helps stabilize blood pressure without increasing heart rate excessively.
Learning objectives
- Differentiate the radiographic findings of Osteoarthritis versus Rheumatoid Arthritis.
- Identify appropriate pharmacological agents to enhance dopamine levels in Parkinson's disease.
- Recognize the classic physical stigmata associated with fetal alcohol syndrome.
- Select the most appropriate vasopressor agent based on hemodynamic goals (e.g., avoiding tachycardia).
- Correlate specific immunodeficiency patterns and inheritance modes (X-linked recessive) with clinical presentation.
Board exam buzzwords