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Related Experiment Videos

Beta-adrenergic blockade in chronic heart failure: principles, progress, and practice

M Packer1

  • 1Division of Circulatory Physiology and The Heart Failure Center, Columbia University, College of Physicians and Surgeons, New York, NY, USA.

Progress in Cardiovascular Diseases
|August 26, 1998
PubMed
Summary

Beta-blockers improve heart function and reduce mortality in chronic heart failure patients. Research is ongoing to determine if combined alpha- and beta-receptor blockers offer superior benefits over selective beta1-receptor blockers.

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Area of Science:

  • Cardiology
  • Pharmacology

Background:

  • Sympathetic nervous system overactivation adversely affects heart function in impaired ventricular function.
  • Norepinephrine and epinephrine interact with alpha1-, beta1-, and beta2-adrenergic receptors, triggering harmful mechanisms.
  • Beta-blockers targeting alpha- and beta-receptors may counteract these detrimental effects.

Purpose of the Study:

  • To evaluate the efficacy of beta-blockers in managing chronic heart failure.
  • To investigate whether combined alpha1-, beta1-, and beta2-receptor blockade is more effective than selective beta1-receptor blockade.

Main Methods:

  • Analysis of numerous randomized, double-blind, placebo-controlled trials.
  • Long-term treatment studies in patients with chronic heart failure.
  • An ongoing large-scale, international trial comparing combined vs. selective beta-blockers.

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Main Results:

  • Long-term beta-blocker treatment improves cardiac function, reduces symptoms, and lowers death and hospitalization risks.
  • Beta1-receptor blockers prevent and reverse structural/functional changes in heart failure progression.
  • Combined beta2- and alpha1-receptor blockade may enhance beta1-blocker efficacy against catecholamine toxicity.

Conclusions:

  • Most chronic heart failure patients are candidates for long-term beta-blocker therapy.
  • The hypothesis that combined alpha- and beta-receptor blockers are superior to selective beta1-blockers is under investigation.