Congenital Heart Disease USMLE Step 1 Practice Question
A 4-year-old boy is found to have an asymptomatic cardiac murmur during a routine physical examination. Cardiac auscultation reveals a fixed, widely split S2 with a systolic flow murmur at the left upper sternal border. Chest X-ray shows cardiomegaly with increased pulmonary vascular markings. Which of the following is the most likely diagnosis?
Answer choices
- AAtrial septal defectCorrect answer
- BAortic regurgitation
- CMitral regurgitation
- DPulmonary regurgitation
- EVentricular septal defect
- FPatent foramen ovale
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.