A 6-Week-Old Infant Is Brought to the Office Due to Difficulty

A 6-week-old infant is brought to the office due to difficulty feeding.  The patient was born at 39 weeks gestation via spontaneous vaginal delivery.  He is breastfeeding for 5 minutes per side every 3 hours.  The patient has profuse sweating and difficulty breathing with feeds.  Weight is at the 5th percentile.  On examination, the patient is tachypneic.  Cardiac examination shows a holosystolic murmur at the left lower sternal border; a palpable thrill is present at the left sternal border.  Compared to a healthy infant, this patient likely has which of the following intracardiac pressure changes?

A) A
B) B
C) C
D) D
E) E

Correct Answer:

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