An 8-Hour-Old Boy Is Being Assessed for a Murmur in the Newborn

An 8-hour-old boy is being assessed for a murmur in the newborn nursery.  The patient was born at 37 weeks via cesarean delivery.  Apgar scores were 7 and 8 at 1 and 5 minutes, respectively.  He was noted to have a harsh ejection systolic murmur of 4/6 intensity during initial newborn examination.  Brachial and femoral pulses are 2+ with no delay.  While the patient is breastfeeding for the first time, his face, lips, hands, and feet become cyanotic.  The murmur cannot be heard during the cyanotic episode.  Which of the following oxygen saturation percentages are most likely present during the cyanotic episode?

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

Correct Answer:

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