Is hypertension caused by low renin easy to treat?

Hypertension caused by low renin levels is often difficult to treat. Renin is a hormone secreted by the human body that elevates blood pressure; thus, low renin levels may indicate underlying renal vascular disease. Specifically:

Markedly reduced renin activity may result from renal vascular disease or primary aldosteronism. Untreated, this condition can disrupt the body’s water and sodium metabolism, necessitating further intervention. Measurement of plasma renin activity holds significant diagnostic value for both renal vascular disease and primary aldosteronism.

There are numerous causes of low renin levels. For instance, an increase in total body water and intravascular volume suppresses renin secretion. Additionally, serum aldosterone levels should be assessed concurrently. When renin is low but aldosterone is elevated, primary aldosteronism must be considered—this may stem from adrenal hyperplasia or, less commonly, from idiopathic causes. In cases of idiopathic low-renin hypertension, antihypertensive agents such as angiotensin-converting enzyme (ACE) inhibitors—including captopril and enalapril—may be appropriate. However, renin-dependent hypertension poses substantial risks; therefore, maintaining stable blood pressure is critical, and surgical intervention may be required when medically refractory.