Noninvasive brain stimulation to improve motor outcomes after stroke

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Stroke significantly impairs motor function, necessitating innovative therapeutic strategies.
• Noninvasive brain stimulation (NIBS) offers a promising avenue for enhancing motor recovery post-stroke.
• Current NIBS approaches show variable efficacy, prompting research into more targeted and effective methods.

Purpose of the Study:

• To review recent advancements in noninvasive brain stimulation (NIBS) techniques for stroke motor outcome improvement.
• To explore the potential of deep brain neuromodulation and single-pulse transcranial magnetic stimulation (TMS) for personalized stroke rehabilitation.

Main Methods:

• Systematic review of existing literature on NIBS for stroke.
• Analysis of emerging NIBS techniques, including transcranial temporal interference stimulation (tTIS) and low-intensity focused ultrasound stimulation (LIFUS).
• Evaluation of prognostic biomarkers, such as motor evoked potential (MEP) status via single-pulse TMS, for patient stratification.

Main Results:

• Inconsistent effect sizes reported for interventional NIBS in stroke motor recovery.
• Emerging techniques like tTIS and LIFUS show potential for modulating deeper brain structures.
• Single-pulse TMS-derived MEP status identified as a prognostic biomarker for tailoring NIBS.

Conclusions:

• Optimizing NIBS for stroke requires more targeted application.
• Future trials should leverage deeper brain stimulation techniques and patient stratification using biomarkers.
• Recruiting patients within homogeneous time windows may enhance therapeutic efficacy.