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Ginkgo biloba extract (EGb 761) improves postischemic function in isolated preconditioned working rat hearts
A Tosaki1, D T Engelman, T Pali
1University of Connecticut Health Center, Farmington 06030-1110.
Coronary Artery Disease
|May 1, 1994
Summary
Ginkgo biloba extract (EGb 761) enhances recovery of heart function after ischemia, offering protection additive to preconditioning by reducing free radicals.
Area of Science:
- Cardiology
- Pharmacology
- Physiology
Background:
- Investigated the effects of preconditioning and Ginkgo biloba extract (EGb 761) on cardiac function recovery post-global ischemia.
- Utilized an isolated working rat heart model to assess myocardial response.
Purpose of the Study:
- To evaluate the protective effects of EGb 761 on contractile function after global ischemia.
- To determine if EGb 761's protection is additive to ischemia-induced preconditioning.
- To assess EGb 761's efficacy in reducing oxygen free radical formation.
Main Methods:
- Isolated working rat hearts were subjected to 30 minutes of global ischemia and 30 minutes of reperfusion.
- Hearts underwent varying cycles of preconditioning (0-4 cycles) before ischemia.
- Groups received different doses of EGb 761 (50 and 100 mg/kg) or were controls.
Main Results:
- Four cycles of preconditioning reduced ventricular arrhythmias but showed limited recovery of cardiac function.
- EGb 761 significantly improved coronary flow, aortic flow, and left ventricular developed pressure in preconditioned hearts.
- EGb 761 dose-dependently reduced free radical formation during reperfusion.
Conclusions:
- EGb 761 improves contractile function after global ischemia in rat hearts by scavenging oxygen free radicals.
- The protective effects of EGb 761 are additive to those of ischemia-induced preconditioning.
- EGb 761 demonstrates potential as a cardioprotective agent in ischemic conditions.