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Journal of Integrative Medicine ›› 2018, Vol. 16 ›› Issue (3): 164-171.doi: 10.1016/j.joim.2018.01.003

• Original Clinical Research • Previous Articles     Next Articles

Patient blinding with blunt tip placebo acupuncture needles: Comparison between 1 mm and 2 mm skin press

Nobuari Takakura a, b, c, Miho Takayama a, b, c, Morihiro Nasu a, Masako Nishiwaki a, Akiko Kawase c, Hiroyoshi Yajima a, b, c   

  1. a Department of Acupuncture and Moxibustion, Faculty of Health Sciences, Tokyo Ariake University of Medical and Health Sciences, Tokyo 135-0063, Japan
    b Department of Physiology, Showa University School of Medicine, Tokyo 142-8555, Japan
    c Japan School of Acupuncture, Moxibustion and Physiotherapy, Tokyo 150-0031, Japan
  • Received:2017-07-18 Accepted:2017-12-05 Online:2018-05-10 Published:2018-01-31
  • Contact: Nobuari Takakura; E-mail: takakura@tau.ac.jp

Objective
To investigate the influence of the depth of skin press in blunt tip placebo acupuncture needles on patient blinding and its relationship to needle diameter.


Methods

Forty healthy volunteers were enrolled as subjects for patient blinding. Four acupuncturists applied the following needles randomly at three points in each forearm: 0.18?mm and 0.25?mm diameter penetrating needles inserted to a depth of 5?mm, and 0.18?mm and 0.25?mm diameter skin-touch needles depressing the skin at the acupoint to a depth of 1?mm and 2?mm from the skin surface. The subjects reported their guesses at the nature of needles they received, and rated needle pain and de qi. A blinding index was calculated to define the success of blinding for subjects.


Results

The blinding status of subjects for 1?mm press needles of 0.18?mm diameter was “random guess”, but “unblinded” for 1?mm press needles of 0.25?mm diameter. For 2?mm press needles of both diameters, the blinding status was “opposite guess” and the blinding status for penetrating needles of both diameters was “unblinded.” The percentages of “felt pain” with 2?mm press needles of both diameters were similar to that with penetrating needles, but those were not similar for 1?mm press needles. The frequency of de qi occurrence with 2?mm press needles of 0.18?mm diameter was similar to that of penetrating needles of both diameters.


Conclusion

Placebo needles of 2?mm press made more subjects guess that the needles penetrated the skin than 1?mm press needles. The use of small diameter needles increased patient blinding.

Key words: Double-blind method, Acupuncture, Placebo, Sham, De qi

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