D-lactic acidosis simulating a hypothalamic syndrome after bowel bypass

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Abstract
A 36-year-old man had one year of periodic symptoms suggestive of episodic hypothalamic dysfunction: hypersomnia, thirst, ravenous hunger and gorging behavior, pallor, and irritability. However, neuroendocrine testing proved normal. A mild transient acidosis at the onset of his attacks and a history of bowel bypass five years earlier prompted metabolic screening. Markedly increased urinary D-lactic and phenolic acids were present, as were intermittent elevations of plasma D-lactic acid during two symptomatic episodes. Prompt and sustained clinical remission coincided with disappearance of abnormal organic acid excretion during oral antibiotic therapy. D-Lactic acidosis must be considered in the differential diagnosis of otherwise unexplained neurological syndromes, particularly in patients with altered bowel anatomy.

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