Medical MCQ - A 26-year-old woman with a 6-month history of depression accompanied by active suicidal ideation ingests 35 g of acetaminophen. She quickly experiences nausea and vomiting. Within 1 day, she becomes progressively obtunded. On physical examination, her temperature is 36.9deg C, pulse is 75/min, respirations are 15/min, and blood pressure is 100/65 mm Hg. She is treated with N-acetylcysteine. Depletion of which of the following is most likely to accentuate her organ damage?

A 26-year-old woman with a 6-month history of depression accompanied by active suicidal ideation ingests 35 g of acetaminophen. She quickly experiences nausea and vomiting. Within 1 day, she becomes progressively obtunded. On physical examination, her temperature is 36.9deg C, pulse is 75/min, respirations are 15/min, and blood pressure is 100/65 mm Hg. She is treated with N-acetylcysteine. Depletion of which of the following is most likely to accentuate her organ damage?

Glutathione (GSH)

Amylase

Creatine kinase

Ketone bodies

Question Category:

Pathology

Correct Answer:

Glutathione (GSH)

Description:

Acetaminophen toxicity leads to hepatic necrosis, indicated by rising ALT and AST levels. If death is not immediate, hyperbilirubinemia also can be seen. N-Acetylcysteine augments glutathione by contributing a sulfhydryl group for binding to toxic metabolites. Elevated serum amylase is seen in pancreatitis. Elevated serum creatine kinase is seen with injury to skeletal and cardiac muscle. Ketonuria is a feature of absolute insulin deficiency in diabetes mellitus; it also is a feature of starvation. Hypokalemia can be a feature of renal diseases and glucocorticoid deficiency.

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