Multiscale Mechanisms that Underlie Intermittent Theta-burst Stimulation in Post-stroke Motor Recovery: From...

Area of Science:

• Neuroscience
• Neuromodulation
• Rehabilitation Medicine

Background:

• Intermittent theta-burst stimulation (iTBS) is a time-efficient neuromodulatory tool for post-stroke motor rehabilitation.
• Clinical efficacy of iTBS is inconsistent across patients and studies, highlighting a need for better understanding.

Purpose of the Study:

• To propose a multiscale framework for understanding iTBS mechanisms in post-stroke recovery.
• To identify limitations in current translational evidence and suggest future research directions.

Main Methods:

• Review of preclinical studies on iTBS effects at microscopic and mesoscopic levels (e.g., ferroptosis, neuroinflammation).
• Analysis of clinical neurophysiological and neuroimaging studies on iTBS impact on brain activity and networks.
• Discussion of factors contributing to treatment variability.

Main Results:

• Preclinical data suggest iTBS modulates early post-stroke repair mechanisms, including neuroinflammation and plasticity.
• Clinical studies show iTBS influences corticospinal excitability, brain oscillations, and motor network organization.
• Numerous factors, including stroke characteristics and stimulation parameters, affect iTBS outcomes.

Conclusions:

• iTBS holds potential for stroke recovery by influencing biological repair and network function.
• Current evidence is limited by study heterogeneity and small sample sizes.
• Future research should focus on standardized reporting, diverse trials, biomarkers, and personalized stimulation for iTBS optimization.