Opposing viewpoints regarding the use of acupuncture for pain relief have been expressed by researchers the world over.
Writing in the June issue of Anesthesia and Analgesia, official journal of the International Anesthesia Research Society (IARS), Dr Shu-Ming Wang of University of California-Irvine and colleagues stated, "[C]linical trials support the efficacy of acupuncture in reducing postoperative nausea and vomiting and postoperative pain."
But David Colquhoun, PhD, of University College London and Dr Steven P. Novella of Yale University School of Medicine take a different view, concluding, ""[T]he benefits of acupuncture are likely nonexistent, or at best are too small and too transient to be of any clinical significance."
Acupuncture studies pose unique challenges, especially in terms of selecting inactive "placebo" comparison treatments.
While acknowledging these difficulties, Dr Wang and coauthors note that many studies have reported benefits of acupuncture. In their view, the evidence is strongest for acupuncture's effectiveness in preventing PONV. One recent research summary, including data on nearly 4,900 patients, concluded that treatment directed at one specific "acupoint" is as effective as conventional drug treatments in preventing PONV, with only minor side effects.
Other studies have reported that acupuncture can reduce the need for pain medication after surgery. Although evidence on chronic pain is mixed, some reports have found acupuncture to be a "reasonable option" for certain conditions, such as knee pain from osteoarthritis. Studies have also supported the cost-effectiveness of acupuncture, showing improvements in health-related quality of life at a small additional cost.
Dr Wang and colleagues also cited brain imaging studies showing different responses to active acupuncture versus inactive treatments. Acupuncture should be viewed as "a medical option that not only treats disorders but also fosters a greater awareness of how harmonic interactions between self, family, work, and environment play a role in promoting health and restoring order," they concluded.
But evaluating the same research, Drs Colquhoun and Novella noted that the largest, highest-quality studies of acupuncture find no significant reduction in pain, compared to inactive treatments.
Although studies typically report a small reduction in pain scores after the start of acupuncture, almost the same pattern is observed in patients receiving any type of treatment, whether active or inactive. Based on the evidence, they write, "It seems that acupuncture is little or no more than a theatrical placebo."
Drs Colquhoun and Novella cited a number of weaknesses in the research evidence, including selectively focusing on a few positive results and "publication bias"-publishing only those studies that show positive effects of acupuncture.
They noted that even for PONV-the problem with the strongest body of evidence-most studies supporting acupuncture were performed by one group of researchers, with significant scientific weaknesses.
With this history of "variable and inconsistent" results, acupuncture should be regarded as "an inactive intervention," Drs Colquhoun and Novella believe.
"Since it has proved impossible to find consistent evidence after more than 3000 trials, it is time to give up," they concluded.