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BACKGROUND Besides providing anesthesia for surgery, the anesthesiologist's role is to optimize the patient for surgery and for post-surgical recovery. This involves timely identification and treatment of medical comorbidities and abnormal laboratory values that could complicate the patient's perioperative course. There are several potential causes of anion and non-anion gap metabolic acidosis in surgical patients, most of which could profoundly affect a patient's surgical outcome. Thus, the presence of an acute acid-base disturbance requires a thorough workup, the results of which will influence the patient's anesthetic management. CASE REPORT An otherwise-healthy 24-year-old female presented for elective spine surgery and was found to have metabolic acidosis, hypotension, and polyuria intraoperatively. Common causes of acute metabolic acidosis were investigated and systematically ruled out, including lactic acidosis, diabetic ketoacidosis, drug-induced ketoacidosis, ingestion of toxic alcohols (e.g., methanol, ethylene glycol), uremia, and acute renal failure. Laboratory workup was remarkable only for elevated serum and urinary ketone levels, believed to be secondary to starvation ketoacidosis. Due to the patient's unexplained acid-base disturbance, she was kept intubated postoperatively to allow for further workup and management. CONCLUSIONS Starvation ketoacidosis is not widely recognized as a perioperative entity, and it is not well described in the medical literature. Lack of anesthesiologist awareness about this disorder may complicate the differential diagnosis for acute intraoperative metabolic acidosis and lead to a prolonged postoperative stay and an increase in hospital costs. The short- and long-term implications of perioperative ketoacidosis are not well defined and require further investigation.

Starvation Ketoacidosis as a Cause of Unexplained Metabolic Acidosis in the Perioperative Period