Diuretic-induced hypokalaemia in patients with hypertension.

We describe a 55 year-old woman with longstanding hypertension who developed hypokalaemia following diuretic treatment. Investigations revealed primary hyperaldosteronism due to an adrenal adenoma, and normal blood pressure was restored after surgical removal of the tumour. Primary hyperaldosteronism is a potentially curable cause of hypertension and should be considered in hypertensive patients who present with diuretic - induced hypokalaemia.