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ACE inhibitors and regression of left ventricular hypertrophy
1Division of Cardiology, Mount Sinai Hospital, Toronto, Ontario, Canada.
Insights
Left ventricular hypertrophy (LVH) is linked to heart disease. Angiotensin-converting enzyme (ACE) inhibitors may reverse LVH by affecting blood pressure and the renin-angiotensin system.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Left ventricular hypertrophy (LVH) is a significant risk factor for cardiac morbidity, often associated with hypertension.
- Antihypertensive agents, particularly angiotensin-converting enzyme (ACE) inhibitors, are known to induce regression of LVH.
Purpose of the Study:
- To investigate the effects of angiotensin II on LVH and left ventricular (LV) function.
- To evaluate the efficacy of lisinopril, an ACE inhibitor, and a diuretic in treating hypertension-induced LVH.
Main Methods:
- A study is underway to assess the impact of lisinopril and a diuretic on patients with hypertension and LVH.
- The study aims to elucidate the mechanisms by which ACE inhibitors reverse LVH.
Main Results:
- ACE inhibitors may reverse LVH through mechanisms beyond simple blood pressure reduction.
- Inhibition of angiotensin II may prevent protein synthesis in myocytes, potentially halting hypertrophy.
- ACE inhibitors influence the renin-angiotensin system, affecting vasoconstriction and vasodilation.
Conclusions:
- ACE inhibitors play a crucial role in the regression of left ventricular hypertrophy.
- Understanding the precise mechanisms of ACE inhibitors in LVH treatment is ongoing.
- Lisinopril and diuretic therapy are being evaluated for their effectiveness in managing hypertension-related LVH.
Abstract:
Left ventricular hypertrophy (LVH) is a common condition and a powerful independent risk factor for coronary heart disease, congestive heart failure, and other cardiac morbidity. It is associated with the male sex and advancing age. Its most common cause is hypertension, and many antihypertensive agents induce regression of LVH. Angiotensin-converting enzyme (ACE) inhibitors have been shown to reverse LVH by a mechanism as yet unknown. Reduction in afterload and other hemodynamic abnormalities by reduction of blood pressure is clearly a factor, but ACE inhibitors also block adrenergic action and other sympathetic nervous system influences, and the reduction in angiotensin II produces many effects. By inhibiting this potent vasoconstrictor and suppressing its degradation of the powerful vasodilator bradykinin, and by promoting sodium and water excretion, ACE inhibitors contribute to the restoration of normal ventricular function. Angiotensin II promotes protein synthesis in myocardial myocytes, and blocking this action may arrest the hypertrophic process. To determine the effect of angiotensin II on LVH and normalization of LV function, a study is now underway evaluating the effects of lisinopril, a new lysine analog of enalapril, and a diuretic agent in the treatment of hypertension LVH.