Acupuncture in angina pectoris: does acupuncture have a specific effect?

To overcome the methodological problems of blinding the patients and the acupuncturist in acupuncture trials, 33 patients with stable angina pectoris, who were randomized to either genuine or sham acupuncture, received electroacupuncture by another acupuncturist, and the change in skin temperature was recorded. It was found that the change in skin temperature correlated significantly with the degree of improvement following both genuine and sham acupuncture. Fourteen patients with no decrease in skin temperature exhibited a significantly better response to acupuncture than 19 patients who showed a decrease in skin temperature (G II). In the former group, there was a 15% median improvement in exercise tolerance (G II 0%), a 67% improvement in anginal attack rate (G II 38%), and an 84% improvement in nitroglycerine consumption (G II 50%). A significant correlation was found between the duration of disease and the effect of acupuncture. It is concluded that both genuine and sham acupuncture have a specific effect on some angina pectoris patients in addition to the effect of pharmacological therapy.