Beta Blockers USMLE Step 1 Practice Question
A 29-year-old woman with a mechanical mitral valve prosthesis becomes pregnant while taking an oral anticoagulant. Her obstetrician warns that continued use during the first trimester causes fetal nasal hypoplasia and stippled epiphyses. On examination, BP is 118/76 mmHg, HR 82/min, and she denies vaginal bleeding. Prothrombin time is elevated at 2.8 INR. Which medication is responsible for these characteristic teratogenic effects?
Answer choices
- AAspirin
- BApixaban
- CWarfarinCorrect answer
- DHeparin
- EClopidogrel
- FPhenprocoumon
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.