Changes in left ventricular anatomy and function in hypertension and primary aldosteronism

Area of Science:

• Cardiology
• Endocrinology
• Hypertension Research

Background:

• Primary aldosteronism is characterized by excess aldosterone and renin-angiotensin system suppression.
• Hypertension associated with primary aldosteronism may have distinct cardiac effects compared to essential hypertension.

Purpose of the Study:

• To investigate the cardiac effects of primary aldosteronism, specifically focusing on left ventricular structure and diastolic function.
• To compare cardiac parameters in patients with primary aldosteronism versus essential hypertension.

Main Methods:

• M-mode echocardiography and transmitral Doppler flow velocity measurements were used.
• 34 patients with primary aldosteronism were matched with 34 patients with essential hypertension based on key demographic and clinical factors.

Main Results:

• Primary aldosteronism patients exhibited higher left ventricular mass index and wall thickness, and a higher prevalence of left ventricular hypertrophy or concentric remodeling.
• Lower serum potassium, suppressed plasma renin activity, and elevated plasma aldosterone were noted in primary aldosteronism.
• Patients with primary aldosteronism showed impaired left ventricular diastolic filling, evidenced by lower E wave velocity integral and E/A integral ratio.
• Surgical treatment for aldosterone-producing tumors led to significant reductions in left ventricular mass and thickness within one year, unlike medical therapy.

Conclusions:

• Excess aldosterone in primary aldosteronism, despite renin-angiotensin system suppression, leads to increased left ventricular mass and altered diastolic function.
• Cardiac remodeling and diastolic dysfunction associated with primary aldosteronism are potentially reversible with surgical correction of the underlying aldosterone overproduction.