Bartter's syndrome in a geriatric patient

Investigations were hemoglobin 17.0 g/dl, serum creatinine 1.36 mg/dl, blood urea 35 mg/dl, serum potassium 2.3 mEq/L, sodium 140 mEq/L, calcium 9.4 mg/dl, phosphorus 2.2 mg/dl, uric acid 6.8 mg/dl, magnesium 2.2 mg/dl, renin activity 4.95 ng/ml/h (reference range on normal sodium diet supine 0.2-1.0 ng/ml/h and upright: 0.5-4.0 ng/ml/h), serum aldosterone 378 pg/ml (reference range: 25-315 pg/ml), 24 h urine potassium: 39 mmol (reference range: 10-20 mmol), 24 h urine calcium 301 mg (reference range: 100-250 mg), 24 h urine chloride 100 mmol (reference range: 10-20 mmol), serum pH 7.86, serum bicarbonate 61.5 mmol/l. Gitelman's syndrome is characterized by hypokalemic metabolic alkalosis with significant hypomagnesemia and low urinary calcium excretion.