NCT01960400

Investigation of the Efficacy of tDCS in the Treatment of Complex Regional Pain Syndrome (CRPS) Type 1

Investigation of the Efficacy of Transcranial Direct Current Stimulation (tDCS) Added to the Graded Motor Imagery (GMI) in the Treatment of Complex Regional Pain Syndrome (CRPS) Type 1

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 22 (actual)
• Sponsor: Université de Sherbrooke · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

The efficacy of the current standard non-pharmacological treatments for complex regional pain syndrome (CRPS), a painful syndrome mostly occurring after musculoskeletal trauma, is suboptimal. It thus appears essential to examine new non-pharmacological therapeutic imagery (GMI) - a non-pharmacological approach with the highest level of evidence (level II). As suggested by the most recent clinical guideline 2, a potential solution would be to add an electrotherapeutic procedure - transcranial direct current stimulation (tDCS) - that may prove effective in modulating cortical excitability and reducing the effect of cortical reorganization on pain. Given the positive results previously obtained in patients with neuropathic pain, it is hypothesized that tDCS will prove to be an innovative add-on treatment method for CRPS patients, and help reduce pain and disability.

Detailed description

Executive summary: The efficacy of the current standard rehabilitation treatments for complex regional pain syndrome (CRPS), a painful syndrome mostly occurring after musculoskeletal trauma, is suboptimal. For instance, the first line of treatment in rehabilitation, progressive motor imagery (GMI), only induces a 50% improvement in symptoms. Although such improvement is interesting, further solutions should be sought to enhance clinical outcomes. It is thus essential to explore new options of therapy. A potential solution to enhance clinical outcomes would be to add an electrotherapeutic procedure, such as transcranial direct current stimulation (tDCS). Given the positive results previously obtained in patients with neuropathic pain, we hypothesize that tDCS will induce functional and structural reorganization in the cortex and lead to better pain relief. The cortical reorganization frequently observed in CRPS patients mainly involves a shrinkage of cortical map of the affected limb on primary and secondary somatosensory cortex. Interestingly, therapies that aim to reverse the cortical reorganization are often associated with a decrease in pain. Therefore, combining GMI and tDCS could lead to added pain relief compared to traditional GMI treatments alone. Furthermore, neuroimaging before and after the procedures could help us explain if and how this is achieved. Objectives: Thus, the primary objective of this research is to study the therapeutic efficacy of tDCS in the treatment of CRPS type 1 in addition to the current best evidence-based rehabilitation treatment, GMI. The second objective is to study, through MRI/fMRI, how brain structures and functions are changed following tDCS and GMI treatments, and whether these changes correlate to clinical changes. Methodology: To achieve the first objective, we will recruit adults diagnosed with CRPS type 1 via established collaborations with different physicians from our university affiliated hospital. Participants will be randomly allocated into one of the two treatment groups A) experimental group, which will receive the GMI and tDCS stimulation; B) control group, which will receive GMI and sham \[placebo\] tDCS stimulation. GMI treatment is composed of a three-phase protocol, each lasting two weeks. The GMI treatments will be performed using software and well-established procedures (www.noigroup.com). For its part, the tDCS will be applied for 5 consecutive days during the first 2 weeks of phase 1 and once a week during the 4 other weeks. The anodic (positive) stimulation over the motor cortex (M1) contralateral of the affected limb is sought to modulate cortical excitability and promote pain inhibition and cortical reorganization. Sample size estimates (β:80%,α 5%) show that 15 subjects/group will be necessary. Anticipated results and impact of the proposed project: This project will allow us to investigate the therapeutic efficacy of an innovative approach to the treatment of CRPS, primarily for the purpose of enhancing the clinical outcomes of GMI. In the event of positive results, we will be able to further examine the therapeutic benefits of this modality in a larger clientele and even in other populations (i.e., patients with chronic low back pain). In addition, our results may contribute to the creation of a clinical practice guide, since there currently is insufficient evidence-based data to establish guidelines regarding the non-pharmacological treatment of CRPS. Finally, MRI/fMRI analysis will help us to capture the phenomenon of tDCS-driven cortical reorganization.

Conditions

• Reflex Sympathetic Dystrophy

Interventions

Type	Name	Description
DEVICE	transcranial direct current stimulation (tDCS) (active or placebo)	TDCS was delivered according to the method described by Fregni et al. (2006) and the safety parameters related to tDCS application were respected (DaSilva et al., 2011). Direct current was delivered using a battery-driven constant current stimulator coupled to saline-soaked (0.9% NaCl) sponge electrodes (5 X 7 cm). Anodal stimulation was delivered over the M1; the anode was placed over C3 or C4 position in the 10/20 system for the EEG electrode position, contralateral to the affected limb, and the cathode over the opposite supraorbital area (i.e. ipsilateral to the affected limb). In the laboratory, a constant current of an intensity of 2 mA was applied for 20 min/day X 5 consecutive days during the first and the second weeks of GMI. To help maintain the potential effects of the neurostimulation, the tDCS was also applied simultaneously with GMI once a week during the 2 other phases until the end of the six weeks GMI program, for a total of 14 treatment sessions.
DEVICE	Graded motor imagery (GMI)	The treatment was performed using a software (Recognise™ online) provided by NOI group (http://www.noigroup.com/recognise). As an alternative to the software (for patients without an internet access), the patient could do the exercises with a Recognise™ Flash Cards set consists of 25 left and 25 right matching images (upper limb or lower limb). Using standardized procedures, inspired from the randomized controlled trial conducted by Moseley (2004, 2006), the participants performed the therapy at home, 10 minutes per session, 3x/day, 6 days/week, using the computer software and a mirror box (Lagueux et al., 2012).

Timeline

• Start date: 2013-04-01
• Primary completion: 2015-06-01
• Completion: 2015-06-01
• First posted: 2013-10-10
• Last updated: 2017-02-06
• Results posted: 2016-11-16

Locations

1 site across 1 country: Canada