A randomized controlled trial of 5 daily sessions and continuous trial of 4 weekly sessions of repetitive transcranial magnetic stimulation for neuropathic pain

Koichi Hosomi, Kenji Sugiyama, Yusaku Nakamura, Toshio Shimokawa, Satoru Oshino, Yuko Goto, Tomoo Mano, Takeshi Shimizu, Takufumi Yanagisawa, Youichi Saitoh, TEN-P11-01 investigators, Koichi Hosomi, Kenji Sugiyama, Yusaku Nakamura, Toshio Shimokawa, Satoru Oshino, Yuko Goto, Tomoo Mano, Takeshi Shimizu, Takufumi Yanagisawa, Youichi Saitoh, TEN-P11-01 investigators

Abstract

We conducted a multicenter, randomized, patient- and assessor-blinded, sham-controlled trial to investigate the efficacy of repetitive transcranial magnetic stimulation (rTMS) of the primary motor cortex (M1) in patients with neuropathic pain (NP). Patients were randomly assigned to receive 5 daily sessions of active or sham rTMS of M1 corresponding to the part of the body experiencing the worst pain (500 pulses per session at 5 Hz). Responders were invited to enroll in an open-label continuous trial involving 4 weekly sessions of active rTMS. The primary outcome was a mean decrease in a visual analogue scale of pain intensity (scaled 0-100 mm) measured daily during the daily sessions in an intention-to-treat population. Secondary outcomes were other pain scores, quality-of-life measures, and depression score. One hundred forty-four patients were assigned to the active or sham stimulation groups. The primary outcome, mean visual analogue scale decreases, was not significantly different (P = 0.58) between the active stimulation group (mean, 8.0) and the sham group (9.2) during the daily sessions. The secondary outcomes were not significantly different between 2 groups. The patients enrolled in the continuous weekly rTMS achieved more pain relief in the active stimulation group compared with the sham (P < 0.01). No serious adverse events were observed. Five daily sessions of rTMS with stimulus conditions used in this trial were ineffective in short-term pain relief in the whole study population with various NP. Long-term administration to the responders should be investigated for the clinical use of rTMS on NP in the future trials.

Conflict of interest statement

K. Hosomi, K. Sugiyama, Y. Nakamura, T. Shimokawa, and Y. Saitoh had grants from AMED during the conduct of the study. Y. Saitoh received consultancy fees from Teijin Pharma Limited during the conduct of the study. Y. Saitoh has an issued patent about TMS coils. K. Hosomi, Y. Goto, T. Mano, T. Shimizu, and Y. Saitoh belong to the Department of Neuromodulation and Neurosurgery, Osaka University Graduate School of Medicine, which is a joint research department established with sponsorship by Teijin Pharma Limited. The remaining authors have no conflicts of interest to declare.

Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article.

Figures

Figure 1.
Figure 1.
Trial schedule. D, day; rTMS, repetitive transcranial magnetic stimulation; W, week.
Figure 2.
Figure 2.
Image of the rTMS equipment. rTMS, repetitive transcranial magnetic stimulation.
Figure 3.
Figure 3.
Flow diagram. GCP, good clinical practice; rTMS, repetitive transcranial magnetic stimulation.
Figure 4.
Figure 4.
Time course of pain scores during the evaluation period in the intention-to-treat population. The mean and 95% CI are shown for (A) visual analogue scale (VAS) and (B) short-form McGill pain questionnaire 2 (SF-MPQ2) at baseline, that is, before the 1st-day intervention, and after each intervention in the evaluation period. CI, confidence interval; D, day.
Figure 5.
Figure 5.
Time course of pain scores in patients enrolled in the continuous trial. The means and 95% CI are shown for (A) visual analogue scale (VAS) and (B) short-form McGill pain questionnaire 2 (SF-MPQ2) at baseline, after each intervention and at the last follow-up. Significant changes from the baseline are indicated as *P < 0.05; **P < 0.01; ***P < 0.001. CI, confidence interval; D, day; W, week.

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Source: PubMed

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