REN and Hypokalemia: Due to the persistent hypokalaemia, renin and aldosterone levels were evaluated, and the following data emerged: secondary hyperaldosteronism (Aldosterone > 100 ng/dl, active renin 408.9 μU/ml); creatinine in the normal range (0.8 mg/dl) and reduced creatinine clearance (70 ml/min); urinary electrolytes and ammonia were not available because the patient left the hospital against medical advice.