Related Experiment Videos
Why do antioxidants fail to provide clinical benefit?
Ascan Warnholtz1, Thomas Münzel
1University Hospital Eppendorf, Division of Cardiology, Hamburg, Germany. muenzel@uke.uni-hamburg.de
Current Controlled Trials in Cardiovascular Medicine
|November 21, 2001
Summary
Antioxidant supplements like vitamin E failed to improve outcomes for patients with coronary artery disease. Angiotensin-converting-enzyme (ACE) inhibitors, however, reduced cardiac events, suggesting enzymatic inhibition is a more effective treatment strategy.
Area of Science:
- Cardiology
- Pharmacology
- Biochemistry
Background:
- Randomized trials investigating antioxidant efficacy in coronary artery disease (CAD) have yielded disappointing results.
- Vitamin E supplementation did not demonstrate any improvement in prognosis for CAD patients.
- Angiotensin-converting-enzyme (ACE) inhibitors have shown promise in reducing adverse coronary events.
Purpose of the Study:
- To evaluate the effectiveness of antioxidants versus ACE inhibitors in managing coronary artery disease.
- To explore the underlying mechanisms of ACE inhibition in cardiovascular protection.
Main Methods:
- Review of recent randomized trials on antioxidant and ACE inhibitor therapies in CAD patients.
- Analysis of the impact of vitamin E on coronary-event rates.
- Assessment of the effects of ACE inhibitors on prognosis and coronary-event rates.
Main Results:
- Vitamin E supplementation showed no benefit in improving prognosis for patients with coronary artery disease.
- Treatment with ACE inhibitors led to a reduction in coronary-event rates and improved patient prognosis.
- ACE inhibition was linked to the prevention of angiotensin II formation, a key factor in superoxide production.
Conclusions:
- Enzymatic inhibition of superoxide production, as achieved by ACE inhibitors, appears more beneficial than symptomatic superoxide scavenging for treating coronary artery disease.
- Targeting the enzymatic pathways involved in atherosclerosis, rather than relying on antioxidants, may represent a superior therapeutic approach.