Key result
Metoprolol (25 mg/kg) prevented left ventricular dilatation and preserved ejection fraction over 24 weeks compared with untreated rats with severe aortic regurgitation.
Why the study?
Does metoprolol improve LV function and remodeling in a rat model of severe chronic aortic regurgitation?
Population
Adult male Wistar rats with severe chronic aortic regurgitation created by retrograde puncture of the aortic…
Comparison
Metoprolol 25 mg/kg orally for 24 weeks, started… vs Untreated animals with severe AR
Design
Preclinical
Follow-up
24 weeks
Authors
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Does not yet warrant beta-blocker use in aortic regurgitation; leaves open translation of rat remodeling benefits to human volume-overload states.
Does metoprolol improve LV function and remodeling in a rat model of severe chronic aortic regurgitation?
In a rat model of severe chronic aortic regurgitation, metoprolol prevented LV dilatation and preserved systolic function, suggesting a potential therapeutic role for beta-blockers in volume-overload cardiomyopathy.
Plante et al. (2004) studied Severe chronic aortic regurgitation. Metoprolol vs. Untreated was evaluated on Left ventricular dimensions, ejection fraction, and filling parameters. Metoprolol (25 mg/kg) prevented left ventricular dilatation and preserved ejection fraction over 24 weeks compared with untreated rats with severe aortic regurgitation.
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