Transcranial Direct Current Stimulation in Neuropathic Pain

Niran Ngernyam, Mark P Jensen, Narong Auvichayapat, Wiyada Punjaruk, Paradee Auvichayapat, Niran Ngernyam, Mark P Jensen, Narong Auvichayapat, Wiyada Punjaruk, Paradee Auvichayapat

Abstract

Neuropathic pain (NP) is one of the most common problems contributing to suffering and disability worldwide. Unfortunately, NP is also largely refractory to treatments, with a large number of patients continuing to report significant pain even when they are receiving recommended medications and physical therapy. Thus, there remains an urgent need for additional effective treatments. In recent years, nonpharmacologic brain stimulation techniques have emerged as potential therapeutic options. Many of these techniques and procedures - such as transcranial magnetic stimulation, spinal cord stimulation, deep brain stimulation, and motor cortical stimulation - have very limited availability, particularly in developing countries. Transcranial direct current stimulation (tDCS) is a noninvasive brain stimulation procedure that has shown promise for effectively treating NP, and also has the potential to be widely available. This review describes tDCS and the tDCS procedures and principles that may be helpful for treating NP. The findings indicate that the analgesic benefits of tDCS can occur both during stimulation and beyond the time of stimulation. The mechanisms of cortical modulation by tDCS may involve various activities in neuronal networks such as increasing glutamine and glutamate under the stimulating electrode, effects on the μ-opioid receptor, and restoration of the defective intracortical inhibition. Additional research is needed to determine (1) the factors that may moderate the efficacy of tDCS, (2) the dose (e.g. number and frequency of treatment sessions) that results in the largest benefits and (3) the long-term effects of tDCS treatment.

Keywords: Neuropathic pain; Noninvasive brain stimulation; Transcranial direct current stimulation.

Figures

Figure 1
Figure 1
Transcranial direct current stimulation and 10–20 international electrode placements. A = Nine volts of direct current power supply, B = Stimulating electrode over the left primary motor area, and C = Reference electrode on the right supraorbital area or right shoulder area.

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Source: PubMed

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