Secondary Hyperaldosteronism

Secondary hyperaldosteronism is a condition where the body produces too much aldosterone, a hormone that controls salt and water balance. This condition affects the kidneys and the hormonal system that regulates blood pressure. When aldosterone levels are high, the body retains excess sodium and loses potassium, which can lead to high blood pressure and muscle weakness. The excess aldosterone is caused by an overactive renin-angiotensin system, often due to decreased blood flow to the kidneys. This condition can result from problems like kidney artery narrowing or heart failure. Managing this condition is important because it can cause serious complications related to blood pressure and electrolyte imbalances.

Secondary hyperaldosteronism is characterized by excessive secretion of aldosterone due to increased stimulation of the adrenal glands by elevated renin levels. The core pathology involves activation of the renin-angiotensin-aldosterone system (RAAS) secondary to decreased renal perfusion or sodium depletion. Common causes include renal artery stenosis, heart failure, cirrhosis, and nephrotic syndrome, all of which reduce effective circulating volume and trigger renin release. This leads to increased aldosterone production, causing sodium retention, potassium wasting, and hypertension. Unlike primary hyperaldosteronism, aldosterone elevation here is driven by high renin levels. Clinically, it is significant because it contributes to resistant hypertension and hypokalemia, requiring identification of the underlying cause for appropriate management.