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Carvedilol may be the Most Useful Beta Blocker
The study, which appears in the journal Circulation Research, found that beta-blockers that target both the alpha- and beta-receptors on the heart muscle offer the most benefit to cardiac patients, while those that target only the beta-receptors can actually undermine the structure and function of the heart.
Circulation Research is published by the American Heart Association.
Heart disease is the leading cause of death in the United States. Patients with heart disease usually have higher levels of catecholamines – hormones that activate the beta-adrenergic receptors to stimulate cardiac muscle contraction. In this process, the heart initially grows to become a more efficient pump. Unfortunately, the researchers found, this growth also predisposes the heart to eventual failure.
Traditionally, beta-blockers targeting the beta-adrenergic receptors have been utilized as a long-term therapy for heart failure.
Interestingly, blocking adrenergic receptors has been widely used clinically for nearly 50 years without a full understanding of the molecular consequences of these drugs, said co-author and graduate student David Cervantes. Kevin Xiang, a professor of molecular and integrative physiology at the University of Illinois led the study. The research team also included researcher Catherine Crosby.
A previous study in 2003 showed that the beta-blocker carvedilol produced a greater survival benefit than another drug, metoprolol tartrate. Carvedilol targets both the beta- and alpha-adrenergic receptors.
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