A 4-Year-Old Boy Is Brought to the Office for Routine

A 4-year-old boy is brought to the office for routine evaluation of a heart murmur.  The patient has no fatigue, shortness of breath, or exercise intolerance.  He has no other medical conditions and has had no surgeries.  Vital signs are within normal limits.  On examination, the patient has no cyanosis or clubbing of the fingers.  There is a 2/6 holosystolic murmur best heard at the left lower sternal border.  There are no rubs or gallops.  Pulses are 2+ in the upper and lower extremities.  Compared to an unaffected child, which of the following changes in oxygen saturation would be expected in this patient?

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

Correct Answer:

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