A 5-Week-Old Infant Born at 36 Weeks' Gestation Is Brought

A 5-week-old infant born at 36 weeks' gestation is brought to the physician for a well-child examination. Her mother reports that she previously breastfed her for 15 minutes every 2 hours but now feeds her for 40 minutes every 4 hours. The infant has six wet diapers and two stools daily. At birth, she weighed 2675 g (5.9 Ibs) and was 47 cm (18.5 in) in length. She currently weighs 3085 g (6.8 lbs) and is 50 cm (19.7 in) in length. Vital signs are with normal limits. Cardiopulmonary examination shows a grade 4/6 continuous murmur heard best at the left infraclavicular area.   Which of the following is the most likely diagnosis?

A) Aortic coarctation
B) Ascending aortic aneurysm
C) Atrial septal defect
D) Mitral valve prolapse
E) Patent ductus arteriosus

Correct Answer:

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