NEET PG / USMLE – MCQ 56

An 18-year-old woman has gastroenteritis with nausea and vomiting and is able to ingest only small amounts of water. After 3 days, she develops light-headedness, especially when sitting or standing. Arterial blood gas analysis is most likely to show which of the following sets of values?

pHPCO2 (mm Hg)HCO3- (mEq/L)
A7.32815
B7.35527
C7.44024
D7.53022
E7.54735

Correct answer : E

Vomiting causes acid loss. Hence it results in metabollic alkalosis. Respiratory compensation mechanism is activated – CO2 retention is produced (respiratory acidosis).

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