Cardiovascular Drugs USMLE Step 1 Practice Question
A 70-year-old woman with recurrent ventricular tachycardia was started on a medication that markedly prolongs phase 3 repolarization. One year later, she presents with progressive dyspnea, photosensitive skin changes, and elevated transaminases (AST 145 U/L, ALT 128 U/L). Vital signs show BP 128/76, HR 82, RR 20, SpO2 92% on room air. Chest X-ray reveals pulmonary fibrosis. She denies orthopnea. Which drug is most likely responsible?
Answer choices
- AHydralazine
- BAdenosine
- CNifedipine
- DDobutamine
- EAmiodaroneCorrect answer
- FSotalol
See the full explanation
Get the correct-answer rationale, why each distractor is wrong, the underlying mechanism, and high-yield associations — plus adaptive practice that targets your weak areas — with a free MedBoardPRO account.