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Review Question - QID 212345

Acid-Base Differential Diagnosis Introduction Anion gap QID: 212345 (M1.OMB.18.1)
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QID 212345 (Type "212345" in App Search)
A 68-year-old man is brought to the emergency department by ambulance after he fainted in the supermarket. He recently had 2 days of gastroenteritis, but did not come to the hospital for treatment. He also recently arrived in Denver for a vacation, but normally lives in Florida. His past medical history is significant for morbid obesity and heavy alcohol use. Arterial blood gas and serum chemistry results are shown below:

Sodium: 138 mEq/L
Chloride: 121 mEq/L
Bicarbonate: 8 mEq/L
pH: 7.25
PaCO2: 20 mmHg

Which of the following etiologies is most likely responsible for this patient's findings?
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