Primary Aldosteronism

Kim, Young Hyug; Koh, Suck Hwan; Lee, Sang Mock; Lee, Kee Hyung; Hong, Sung Hwa; Yoon, Choong

Abstract

BACKGROUND: Management of primary aldosteronism has undergone dramatic changes in the past 40 years. This retrospective study was carried out to review our surgical experience and postoperative outcome and to identify the clinical charateristics of primary aldosteronism.
METHODS
Twenty-five patients who underwent an adrenalectomy for primary aldosteronism from 1983 to 1997 were included in the study. All patients were operated on at the Department of Surgery, School of Medicine, Kyung-Hee University. We reviewed the records of 18 women and 7 men, ranging in age from 22 to 59 years. Data examined included clinical presentation, biochemical results, hormonal evaluation, localization studies, operative results, pathologic details, and postoperative outcome. The diagnosis of primary aldosteronism was based on a demonstration of hypertension, hypokalemia, elevated plasma aldosterone concentration, and suppressed plasma renin activity. Localization studies, including computed tomography (CT) and ultrasonography (US) were performed in all patients. A follow-up study was conducted by either reviewing clinical records, telephone contact, or examination of patients during return visits.
RESULTS
Hypertension and hypokalemia were present in all patients. Serum potassium ranged from 1.4 to 3.2 mEq/L (2.3+/-0.5; mean+/-standard deviation {SD}mEq/L), and hypokalemia was considered an important diagnostic clue. We found the accuracy rate for CT results in our patients to be 96.0% (24 patients). An adrenal venous sampling was performed in one patient whose CT results were not confirmatory. A unilateral adrenalectomy was performed through posterior (22 patients), an anterior transabdominal (1 patient), or a lateral transabdominal laparoscopic (2 patients) approach. A laparoscopic adrenalectomy will minimize postoperative pain and hospital stay. The histological findings were 23 aldosterone-producing adenomas and 1 nodular hyperplasia. During a mean follow-up of 31.6 months, 22 (91.7%) of the 24 patients required no further antihypertensive treatment.
CONCLUSION
Primary aldosteronism due to an aldosterone-producing adenoma can be diagnosed and localized expeditiously, and surgical treatment can be performed safely.