[Anesthetic management of a patient with Bartter's syndrome].

A 48-year-old woman with Bartter's syndrome underwent right mastectomy under general anesthesia. Her operative course was uneventful. She was preoperatively complicated with severe hypokalemia but had no signs and symptoms of hypokalemia. In anesthetic care of patients with Bartter's syndrome, even when they have no symptoms of hypokalemia, the meticulous intravenous administration of potassium chloride is required in order to maintain the preoperative level of the serum potassium during anesthesia. In addition, attention should be paid to factors causing an additional reduction in the serum potassium concentration, such as alkalosis, elevated beta 2-adrenergic activity, increased availability of insulin and hypothermia.