A Narrative Review on the Current Landscape of Invasive Neuromodulation for Poststroke Motor Recovery: Mechanisms,...

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Stroke is a primary cause of long-term disability, with many survivors experiencing incomplete recovery despite current rehabilitation strategies.
• Invasive neuromodulation techniques offer potential therapeutic benefits for poststroke recovery but are not yet standard practice.
• A critical evaluation of these invasive methods is necessary due to their inherent risks and limitations.

Purpose of the Study:

• To review invasive neuromodulation strategies for poststroke recovery.
• To analyze the mechanisms of action, clinical evidence, and technical challenges associated with these interventions.
• To assess the current landscape and future potential of invasive neuromodulation in stroke rehabilitation.

Main Methods:

• A systematic literature search was performed on PubMed (2000-2025) using terms related to stroke, stroke rehabilitation, and various invasive neurostimulation techniques.
• Human clinical trials were identified through ClinicalTrials.gov and the European Union Clinical Trials Register.
• Preclinical studies supporting selected clinical trials were also incorporated into the review.

Main Results:

• Vagal nerve stimulation is FDA-approved, while motor cortex, cerebellar, and spinal cord stimulation are investigational for stroke.
• These techniques aim to activate residual motor networks and enhance neural plasticity.
• Significant challenges include small patient cohorts, stroke variability, inconsistent rehabilitation protocols, and diverse outcome measures, hindering consistent therapeutic results.

Conclusions:

• Understanding the mechanisms of invasive neuromodulation is crucial for maximizing therapeutic benefits and mitigating risks.
• Advancements in electrode technology, adaptive stimulation protocols, and multimodal treatment approaches are promising for enhancing efficacy.
• Optimizing invasive neuromodulation holds potential for improving functional outcomes in stroke survivors.