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Is sham laser a valid control for acupuncture trials?
Dominik Irnich1, Norbert Salih, Martin Offenbächer
1Multidisciplinary Pain Center, Department of Anaesthesiology, University of Munich, Pettenkoferstraße 8A, 80336 Munich, Germany.
Summary
Sham laser acupuncture is an indistinguishable placebo control for laser and needle acupuncture trials. This sham control effectively mimics real treatments, validating its use in research to isolate needling effects.
Area of Science:
- Integrative and Complementary Medicine
- Acupuncture Research Methodology
- Laser Therapy
Background:
- Adequate placebo controls are a significant methodological challenge in acupuncture clinical trials.
- Evaluating the efficacy of acupuncture requires reliable methods to distinguish specific treatment effects from placebo responses.
- Sham laser acupuncture has been proposed as a potential placebo control, but its validity needs rigorous assessment.
Purpose of the Study:
- To evaluate the use of sham laser acupuncture as a credible placebo control in acupuncture research.
- To compare the indistinguishability and deqi-like sensations between verum (active) laser acupuncture and sham laser acupuncture.
- To assess the credibility of sham laser acupuncture against needle acupuncture by pooling data from previous trials.
Main Methods:
- A randomized, double-blinded, cross-over design was employed with 34 healthy volunteers.
- Participants received both verum laser (invisible infrared and red light) and sham laser (red light only) at acupuncture points LI4, LU7, and LR3.
- Primary outcome: participant's correct identification of treatment type. Secondary outcome: occurrence and intensity (visual analog scale) of deqi-like sensations.
Main Results:
- 44% of participants correctly identified the verum laser after the first session, and 41% after the second, indicating treatments were indistinguishable (P = .26).
- Deqi-like sensations were reported by 46% of participants during verum laser treatment (mean VAS 2.34) and 49% during sham laser treatment (mean VAS 2.49).
- Pooled analysis of three prior trials confirmed sham laser acupuncture's credibility was comparable to needle acupuncture.
Conclusions:
- Sham laser acupuncture serves as a valid and indistinguishable placebo control for laser acupuncture studies.
- Due to its comparable credibility and lack of peripheral sensory input, sham laser acupuncture is suitable as a control for general acupuncture trials.
- This validates sham laser acupuncture's utility in research designed to isolate the specific effects of needling in acupuncture.