Acupuncture for vulvodynia

Vulvodynia is a syndrome characterized by vulvar pain and burning sensation without abnormal clinical findings, which significantly affects women's quality of life and sexual function. This pioneering 1999 study, published in the Journal of the Royal Society of Medicine, investigated the use of acupuncture as a therapeutic alternative for this challenging condition. The research was conducted by Powell and Wojnarowska in Oxford, England, involving 12 women aged 18 to 68 years who suffered from vulvodynia refractory to conventional treatments. All participants had tried multiple therapies without success, including low-dose amitriptyline, emollients, topical steroids, antihistamines, and other interventions listed as standard treatments.

The study was a crossover design, in which each patient served as her own control. Six patients received acupuncture during the first five weeks and the other six during the last five weeks of the ten-week period. The acupuncture protocol involved insertion of four fine needles at specific points: two on the spleen meridian (points 6 and 9), one on the liver meridian (point 3), and one on the large intestine meridian (point 4). Interestingly, the authors found that these points had been recommended for external genital pain in the Yellow Emperor's Classic of Internal Medicine centuries ago.

Outcomes were monitored weekly through questionnaires, a visual analog scale for pain, and an adapted quality-of-life questionnaire. Side effects were minimal, limited to minor bleeding or local discomfort at the needle site. The results revealed three distinct response patterns. Two patients (17%) considered themselves 'cured' and were satisfied to be discharged from the clinic.

One of them, notably, had been unable to tolerate amitriptyline because of side effects. Three patients (25%) experienced symptom control during the acupuncture period but relapsed after treatment cessation, wishing to continue with acupuncture. Four patients (33%) judged acupuncture possibly more effective than previous treatments, although their scores did not change substantially. Three patients (25%) felt no improvement at all.

The authors discuss that vulvodynia is commonly associated with other conditions such as interstitial cystitis, irritable bowel syndrome, and myalgic encephalomyelitis. They propose that the condition represents an atypical pain syndrome, in which pain is felt in the absence of the usual nociceptor stimulus. The proposed mechanism involves sensitization of dorsal horn neurons, which respond abnormally to light touch and pressure. Acupuncture is hypothesized to raise beta-endorphin levels and desensitize the dorsal horn, potentially 'switching off' the hyperactive and dysfunctional sensory pain system.

The clinical implications are significant, considering the refractory nature of vulvodynia to conventional treatments. The study suggests that acupuncture may be a valuable option for patients who do not respond to other therapies. However, the authors acknowledge that acupuncture is time-consuming and that much of the beneficial effect may derive from regular specialized contact. The fact that even non-responders showed slight improvement on post-treatment questionnaires suggests an important component of specialized care and attention.