Report on three cases of familial primary aldosteronism type IV.

Primary aldosteronism is the most common cause of secondary hypertension, which is caused by increased aldosterone secretion in the adrenal cortex and contains many subtypes, among which familial hyperaldosteronism is relatively rare. Familial hyperaldosteronism can be divided into four subtypes based on its clinical manifestations and mutated genes: FH-I , FH-II , FH-III , and FH-IV . This article reports on three patients with FH-IV: a mother and her two sons. They were diagnosed with hypertension in other hospitals, and hypokalemia was found during hospitalization in our department. Diltiazem and terazosin were used for elution for 1 month. Renin and aldosterone levels in standing or supine positions improved, and the aldosterone-to-renin ratio was positive. Primary aldosteronism was diagnosed based on improved saline and captopril inhibition tests. As the three patients were blood-related immediate family members, gene screening was performed, diagnosing them with FH-IV . This article reports the clinical characteristics of the three cases in combination with related literature to improve the understanding of FH-IV .