<prompt> 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 75min, respirations are 15min, and blood pressure is 10065 mm Hg. She is treated with N-acetylcysteine. Depletion of which of the following is most likely to accentuate her organ damage?Glutathione GSHAmylaseCreatine kinaseKetone bodies  <response>: 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. 