Low-renin hypertension: more common than we think?

Area of Science:

• Nephrology
• Endocrinology
• Hypertension Research

Background:

• Low-renin hypertension is common and linked to increased sodium retention.
• Several conditions, including primary aldosteronism and Liddle's syndrome, cause hyperactive epithelial sodium channels (ENaCs) in the kidney.
• Glucocorticoid remedial aldosteronism and apparent mineralocorticoid excess also increase ENaC numbers.

Purpose of the Study:

• To investigate the potential role of increased epithelial sodium channel (ENaC) activity in low-renin essential hypertension.
• To explore the therapeutic response of low-renin hypertension to mineralocorticoid receptor antagonists.

Main Methods:

• Review of known etiologies of low-renin hypertension and their association with ENaC activity.
• Observation of patient populations, particularly black patients with low-renin hypertension.
• Analysis of preliminary findings on patient response to spironolactone therapy.

Main Results:

• Known causes of low-renin hypertension involve mineralocorticoid-induced increases in ENaC number or function.
• Low-renin hypertension is prevalent in black patients, sharing features with Liddle's syndrome.
• Preliminary data indicate favorable responses to spironolactone in some black patients with low-renin hypertension resistant to standard treatment.

Conclusions:

• Increased ENaC activity is a common mechanism in various forms of low-renin hypertension.
• Further research is warranted to confirm the role of ENaC in low-renin essential hypertension.
• Spironolactone may be a beneficial therapeutic option for specific patient groups with low-renin hypertension.