Fifteen-day Acupuncture Treatment Relieves Diabetic Peripheral Neuropathy

Diabetic peripheral neuropathy (DPN) is one of the most frequent complications of diabetes, affecting between 12% and 50% of diabetic patients. This condition can produce debilitating symptoms such as loss of sensation, pain, numbness, and weakness in the extremities, potentially leading to foot ulcers and other serious complications. The total annual cost of DPN in the United States is estimated at more than four billion dollars. This randomized controlled trial was conducted at Jilin Hospital of Chinese Medicine between June and December 2005, enrolling 63 patients with type 1 or type 2 diabetes who had mild DPN.

Participants were between 35 and 52 years of age and were randomly assigned to two groups: 42 received true acupuncture and 21 received sham acupuncture. All patients continued their conventional diabetes treatment throughout the study. The acupuncture protocol used five specific bilateral points: Hegu (LI-4), Fenglong (ST-40), Quchi (LI-11), Zusanli (ST-36), and Sanyinjiao (SP-6). These points were selected according to traditional Chinese medicine principles for treating neurological disorders.

In the true acupuncture group, needles were inserted deeply (1.2 to 2.3 cm depending on the point) until 'De qi' was elicited - a specific sensation perceived by both the patient and the acupuncturist. Needles were manipulated every 5 minutes by rotation. In the sham group, needles were inserted superficially (only 0.3 cm) at the same points, without manipulation or elicitation of De qi. Each session lasted 30 minutes and was performed daily for 15 consecutive days.

Primary outcomes included electrophysiological measures of motor and sensory nerve conduction, along with assessment of subjective symptoms using standardized questionnaires. The symptoms evaluated included numbness, pain, stiffness, altered temperature perception, paresthesias, and weakness, graded on a 0-to-4 scale for severity and extent. Objective measures showed significant improvements in the true acupuncture group. Three of the six motor nerve function measures demonstrated significant improvement, including tibial motor nerve conduction velocity (0.7 m/s improvement, p < 0.01) and median nerve F-wave conduction velocity (0.9 m/s improvement, p < 0.01).

Sensory nerve conduction velocity in the forearm also improved significantly. By contrast, the sham group showed no significant improvements in any electrophysiological measure. The vibration perception threshold, an important measure of sensory function, showed significant between-group differences and significant improvement from baseline in the acupuncture group. With respect to subjective symptoms, acupuncture was significantly superior to sham treatment for numbness of the lower extremities, spontaneous pain in the lower extremities, stiffness in the upper extremities, and altered temperature perception in the lower extremities.

The between-group difference increased progressively over the 15 days of treatment, suggesting a cumulative effect of acupuncture. The study maintained adequate participant blinding, although there was some response bias, with many participants believing they had received active treatment regardless of group assignment. The investigators propose that acupuncture may accelerate the nerve regeneration process in patients with DPN, potentially by modulating the abnormal excitability of immature regenerated nerve fibers. This mechanism would account for both the symptomatic improvement and the gains in objective measures of nerve function.

The clinical implications are encouraging, suggesting that acupuncture may be a safe and effective intervention for patients with DPN, complementing conventional glycemic control. The technique offers clear advantages in reducing symptoms related to nerve disorders, with the potential to substantially improve patients' quality of life.