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Abstract
Case Report: Arginine hydrochloride is used both diagnostically to test for growth hormone deficiency and therapeutically for treatment of metabolic alkalosis. We describe a 21-month-old girl who developed cardiopulmonary arrest following an accidental overdose of arginine hydrochloride. The patient developed acute metabolic acidosis and transient, but severe, hyponatremia. Thirty-six hours after successful resuscitation, she developed fatal central pontine and extrapontine myelinolysis. Unlike previous reports of arginine toxicity, our patient showed no evidence of hyperkalemia. This case illustrates a previously unreported mechanism of arginine hydrochloride toxicity.