The diagnosis of primary hyperaldosteronism

Area of Science:

• Endocrinology
• Nephrology
• Internal Medicine

Background:

• Primary hyperaldosteronism is a common cause of secondary hypertension.
• Distinguishing between aldosterone-producing adenomas and idiopathic adrenal hyperplasia is crucial for treatment decisions.
• Accurate lateralization of aldosterone production is essential for surgical planning.

Purpose of the Study:

• To evaluate the diagnostic reliability of an extracellular-fluid volume expansion test for primary hyperaldosteronism.
• To assess the utility of adrenal-vein sampling in lateralizing aldosterone-producing adenomas versus adrenal hyperplasia.

Main Methods:

• A three-day extracellular-fluid volume expansion protocol was employed.
• Adrenal-vein plasma aldosterone/cortisol concentration ratios were measured.
• Comparison of ratios between adrenal veins and the inferior vena cava was performed.

Main Results:

• The aldosterone-suppression test reliably discriminated between aldosterone-producing adenomas, idiopathic adrenal hyperplasia, and essential benign hypertension.
• Adrenal-vein sampling successfully lateralized all 21 aldosterone-producing adenomas.
• Contralateral adrenal suppression was observed in adenoma cases, while hyperplasia cases showed elevated ratios from both adrenals.

Conclusions:

• The extracellular-fluid volume expansion test is a reliable method for diagnosing primary hyperaldosteronism subtypes.
• Adrenal-vein sampling is effective for lateralizing aldosterone-producing adenomas.
• Adrenal-vein sampling may be unnecessary for diagnosing adrenal hyperplasia due to the reliability of the suppression test.