Related Experiment Videos
Protective effects of carvedilol in the myocardium
G Z Feuerstein1, A Bril, R R Ruffolo
1Division of Pharmacological Sciences, SmithKline Beecham Pharmaceuticals, King of Prussia, Pennsylvania 19406, USA.
Insights
Beta blockers, like carvedilol, effectively treat hypertension and congestive heart failure. Carvedilol reduces mortality and hospitalizations by inhibiting sympathetic nervous system activity and providing antioxidant benefits.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Beta blockers are established treatments for systemic hypertension, reducing blood pressure and left ventricular hypertrophy.
- Congestive heart failure involves sympathetic nervous system activation, suggesting potential benefits from beta blockers.
Purpose of the Study:
- To evaluate the efficacy of beta blockers, specifically carvedilol, in treating congestive heart failure.
- To explore the multifaceted pharmacological properties of carvedilol beyond standard beta blockade.
Main Methods:
- Clinical trials evaluating beta blockers in congestive heart failure patients.
- Analysis of carvedilol's effects on blood pressure, renal function, mortality, and hospitalization rates.
Main Results:
- Carvedilol, a vasodilating beta blocker, lowers blood pressure without reflex tachycardia and preserves renal function.
- Carvedilol demonstrated a 65% reduction in mortality and a 29% decrease in hospitalizations for heart failure patients.
Conclusions:
- Carvedilol's benefits in heart failure stem from beta blockade, alpha(1)-adrenoceptor blockade-induced vasodilation, and potent antioxidant properties.
- Carvedilol's antioxidant activity inhibits catecholamine toxicity, reduces myocardial damage, and prevents apoptosis, offering a novel therapeutic approach.
Abstract:
Beta blockers have long been used in the treatment of systemic hypertension, where they effectively lower blood pressure and, in so doing, they decrease left ventricular hypertrophy. The sympathetic nervous system is activated in patients with congestive heart failure, and therefore it is logical that beta blockers may also provide benefit in these patients. As such, beta blockers are currently being evaluated in several large clinical trials in congestive heart failure. One particular drug, carvedilol, is a third-generation vasodilating beta blocker that is marketed for the treatment of hypertension. The drug lowers systemic arterial blood pressure without producing reflex tachycardia and preserves renal function. Carvedilol decreases mortality by 65% and decreases hospitalization by 29% in patients with congestive heart failure. The effects of carvedilol in heart failure may result, at least in part, from beta blockade as well as vasodilation, the latter resulting from alpha(1)-adrenoceptor blockade. Interestingly, carvedilol has a number of additional properties that may also provide benefit in these patients. Carvedilol and several of its metabolites are potent antioxidants that may inhibit catecholamine toxicity resulting from the oxidation of norepinephrine and the subsequent formation of toxic intermediates, including the generation of reactive oxygen free radicals in the myocardium. As a result of its antioxidant activity, carvedilol also blocks the expression of several genes involved in myocardial damage and cardiac remodeling, and the drug inhibits free radical-induced activation of transcription factors and programmed cell death (apoptosis). Carvedilol is a novel beta blocker that is highly effective in the treatment of hypertension and congestive heart failure, and combines in one molecule a number of important pharmacologic properties.