Heart Failure USMLE Step 1 Practice Question
A 3-month-old boy presents with poor feeding and tachypnea for 2 weeks. Vital signs show HR 160 bpm, RR 52/min, BP 85/55 mmHg, SpO2 94% on room air, and normal temperature. Physical examination reveals a harsh holosystolic murmur at the left lower sternal border. Chest X-ray demonstrates pulmonary edema and cardiomegaly. Echocardiography confirms a defect in the interventricular septum. The patient takes no chronic medications. Which diagnosis best explains these findings?
Answer choices
- APatent ductus arteriosus
- BTetralogy of Fallot
- CCoarctation of the aorta
- DAtrial septal defect
- EVentricular septal defectCorrect answer
- FTransposition of the great arteries
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