A 4-Week-Old, Full-Term Boy Is Brought to the Emergency Department

A 4-week-old, full-term boy is brought to the emergency department due to vomiting.  His parents describe the emesis as undigested formula without blood or bile.  The vomiting occurs after feeds and has increased in frequency and force over the past 3 days.  He is afebrile.  Blood pressure is normal, pulse is 182/min, and oxygen saturation of 98% on room air.  Examination shows a sunken anterior fontanelle and dry mucous membranes.  Cardiac examination reveals tachycardia but no murmurs or gallops.  The abdomen is soft, nontender, and nondistended.  Arterial blood gas analysis is most likely to reveal which of the following sets of values?

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

Correct Answer:

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