 Although primary aldosteronism PA was formerly seen as a rare cause of hypertension, this condition is now thought to be the commonest cause of secondary hypertension, with the prevalence ranging up to 10-15 of all hypertensives. Identification of patients with PA allows for specific treatment, for instance unilateral adrenalectomy in case of an aldosterone-producing adenoma or the administration of an aldosterone-receptor antagonist in case of bilateral adrenal hyperplasia. 