Abstract
In a randomized, placebo-controlled, double-blind, parallel study of 20 patients, the anti ischemic effect of EGb 761 (Ginkgo biloba Extract) was studied by measuring the tran scutaneous partial pressure of oxygen (TcPo2) during exercise. Transcutaneous oximetry during exercise provides a good, noninvasive estimation of local arterial perfusion and constitutes a real index of local and regional capillary perfusion.
Twenty patients between the ages of forty-four and seventy-three years suffering from claudicating atherosclerotic arterial occlusive disease in stage II according to the Leriche and Fontaine classification, diagnosed for more than a year and stable for three months, were included.
The eligible patients received placebo for fifteen days under single-blind conditions. At the end of this preinclusion period, the eligibility criteria were checked and the patients were randomized to two treatment groups. The first group received 320 mg per day of EGb 761 for four weeks and the second group received placebo. The treadmill walking test was performed under standardized conditions at the same time of day and by the same investigator.
In a comparison of the differences before and after treatment, the areas of ischemia decreased by 38% in the EGb 761 group but remained essentially stable (+5%) in the placebo group. This difference between groups is significant (F [1.18] =4.91; P=0.04) and the 95% confidence interval for the difference ranges from 0.89 to 3.87.
This study confirmed significantly the rapid antiischemic action of EGb 761 and its value in the management of peripheral arterial occlusive disease at the stage of inter mittent claudication.