Contralaterally Controlled Functional Electrical Stimulation Combined With Brain Stimulation for Severe Upper Limb...

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Two-thirds of stroke survivors have chronic upper limb paresis, with 50% experiencing severe impairment.
• Limited treatment options exist for severely impaired survivors, often relying on conventional rehabilitation.
• Current approaches aim to modulate motor cortex excitability, but yield limited benefits in severe cases due to insufficient ipsilesional substrate.

Purpose of the Study:

• To test a novel treatment combining Contralaterally Controlled Functional Electrical Stimulation (CCFES) with a new repetitive transcranial magnetic stimulation (rTMS) approach.
• To investigate if exciting contralesional higher motor cortices (cHMC) alongside CCFES can improve paretic upper limb function in severe stroke survivors.
• To explore the recruitment of spared transcallosal and ipsilateral neural substrates.

Main Methods:

• A prospective, double-blind, placebo-controlled randomized controlled trial (RCT) involving 72 chronic stroke survivors with severe distal hand impairment.
• Participants received CCFES plus either cHMC rTMS, ipsilesional M1 (iM1) rTMS, or sham rTMS, twice weekly for 12 weeks.
• Motor impairment (UEFM), functional ability (WMFT), and perceived disability were assessed at multiple time points, with TMS performed to evaluate neural mechanisms.

Main Results:

• The study is designed to evaluate the efficacy of the combined CCFES and cHMC rTMS approach.
• Primary outcomes include changes in upper limb motor impairment and functional ability.
• Secondary outcomes assess perceived disability and underlying neural mechanisms, including inter-hemispheric and ipsilateral pathways.

Conclusions:

• Combining CCFES with cHMC rTMS may offer a promising therapeutic strategy for severely impaired stroke survivors.
• Targeting spared neural substrates through this combined approach could enhance recovery of upper limb function.
• This combinatorial treatment has the potential to address limitations of current rehabilitation methods.