How does acute MI affect left ventricular remodeling and what therapy helps prevent it?

• A. Remodeling leads to dilatation and dysfunction; ACE inhibitors or ARBs and beta-blockers help prevent adverse remodeling.
• B. Remodeling reduces LV size; calcium channel blockers prevent it.
• C. Remodeling is unaffected by medications; diuretics prevent it.
• D. Remodeling only occurs months after MI; statins prevent it.

Answer: (A)

After an acute MI, the left ventricle undergoes remodeling as dead tissue is replaced by scar and the surrounding myocardium remodels to compensate. This process often leads to dilation and reduced pumping efficiency, increasing wall stress and risk of heart failure. Therapies that prevent this adverse remodeling work by blunting the neurohormonal systems driving dilation and by easing the heart’s workload. ACE inhibitors or ARBs reduce angiotensin II–mediated vasoconstriction and fibrosis, lowering afterload and limiting dilatation. Beta-blockers decrease sympathetic stimulation, slowing adverse structural changes and helping preserve ventricular function. Together, these treatments after MI help maintain LV size and function and improve survival. Diuretics relieve symptoms but don’t prevent remodeling; calcium channel blockers aren’t the main preventive strategy; while statins are important after MI for plaque and risk management, they’re not the primary remodeling-prevention therapy.