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Beta-blockade improves adjacent regional sympathetic innervation during postinfarction remodeling.

C M Kramer¹, P D Nicol, W J Rogers

¹Division of Cardiology, Department of Medicine, Allegheny General Hospital, Pittsburgh, Pennsylvania 15212, USA.

The American Journal of Physiology

|October 12, 1999

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Adding beta-blockade to angiotensin-converting enzyme inhibition after myocardial infarction improves ejection fraction and sympathetic innervation. This combination therapy enhances cardiac function without altering left ventricular size post-heart attack.

Area of Science:

Cardiovascular Medicine
Pharmacology
Medical Imaging

Background:

Left ventricular (LV) remodeling after myocardial infarction (MI) is a critical determinant of long-term outcomes.
The combined effects of angiotensin-converting enzyme inhibition (ACEI) and beta-blockade on LV remodeling post-MI require further elucidation.

Purpose of the Study:

To investigate the impact of adding beta-blockade (metoprolol) to ACEI (ramipril) on LV remodeling and cardiac function after anterior MI.
To assess changes in LV volumes, mass, ejection fraction, and sympathetic innervation.

Main Methods:

Seventeen sheep underwent coronary ligation for anteroapical infarction and were randomized to ramipril (ACEI) or ramipril plus metoprolol (ACEI-beta).
Magnetic resonance imaging (MRI) assessed LV remodeling parameters before and 8 weeks after MI.

Related Experiment Videos

(123)I-labeled m-iodobenzylguanidine (MIBG) quantified sympathetic innervation; microspheres measured regional blood flow.

Main Results:

No significant differences were observed in infarct size, regional blood flow, or LV mass between groups.
The ACEI-beta group showed a significantly smaller decline in ejection fraction (EF) over 8 weeks compared to the ACEI group (-13% vs. -22%).
The ratio of adjacent to remote region (123)I-MIBG uptake was higher in the ACEI-beta group, indicating improved sympathetic innervation.

Conclusions:

Beta-blockade, when added to ACE inhibition post-MI, improves ejection fraction and regional sympathetic innervation.
This combination therapy does not significantly alter left ventricular size or remodeling parameters.
The findings suggest a beneficial role for combined ACEI and beta-blocker therapy in preserving cardiac function after anterior myocardial infarction.