Acupuncture for migraine prophylaxis: a randomized controlled trial

This rigorous Chinese multicenter study investigated whether specific migraine acupoints are more effective than other points or sham acupuncture in attack prevention. The study included 480 patients with migraine diagnosed according to international criteria, the majority being women (82.8%) with a mean age of 37 years. The experimental design compared four groups: specific points of the Shaoyang meridian for migraine, nonspecific points of the same meridian, specific points of the Yangming meridian, and sham acupuncture at sites outside traditional meridians. All groups received 20 sessions of 30 minutes with electrostimulation over 4 weeks, applied by experienced acupuncturists following standardized protocols.

The primary outcome was the number of migraine days recorded in patient diaries during weeks 5-8 after randomization. Secondary outcomes included frequency and intensity of attacks, use of rescue medications, and migraine-specific quality of life. The study was carefully planned with blinding of patients, evaluators, and statisticians, central randomization stratified by center, and intention-to-treat analysis. The main results showed no significant differences between any of the acupuncture groups and the sham control during the period immediately after treatment (weeks 5-8).

However, at later follow-up (weeks 13-16), all three acupuncture groups showed a significant but clinically small reduction in the number of migraine days compared to control. The greatest difference was in the nonspecific Shaoyang group, with a reduction of 1.22 days compared to control. Important secondary findings included improvement in migraine-specific quality of life in the Shaoyang groups compared to control. Surprisingly, no relevant differences were found between the three types of acupuncture tested, suggesting that the specific location of points may have less importance than traditionally assumed.

Safety was adequate, with 37 patients (7.8%) experiencing minor adverse events, mainly subcutaneous bleeding at the puncture site. The study has several important methodological strengths: large sample size, validated control with sham acupuncture, rigorous experimental methods, prepublished protocol, and independent statistical analyses. Limitations include relatively short follow-up period, patient self-reported outcomes, and inability to blind acupuncturists. The findings suggest that nonspecific effects of acupuncture may play a relevant role in migraine treatment.

The use of electrostimulation in all groups, including the control, may have contributed to the absence of significant differences in the immediately post-treatment period, possibly through the release of endorphins and other pain control mechanisms. This study contributes to the debate on acupoint specificity and suggests that acupuncture may have prophylactic benefit for migraine, although clinically modest.