Evidence for a Window of Enhanced Plasticity in the Human Motor Cortex Following Ischemic Stroke.
Brenton Hordacre, Duncan Austin, Katlyn E Brown and 10 others
PMID 33576318WHAT IT FOUND
In people after mild to moderate ischemic stroke, a brain-stimulation test showed the opposite side of the motor cortex was more changeable around two weeks, then less so.
The injured side showed no clear early change. This was a measure, not a treatment.
Key findings
01A brain-stimulation measure in the opposite motor cortex showed its strongest response at 2 weeks post-stroke and declined at later sessions.
02The same measure in the injured-side motor cortex remained approximately constant over the study.
03The early response on the opposite side was not associated with upper limb recovery at 4, 6 or 26 weeks.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
No pre-stroke response was measured, so the early response cannot be compared directly with each person's normal state. Fugl-Meyer scores averaged about 62 points of a possible 66 at admission, leaving little room to show recovery. Participants had mild to moderate stroke and moderate to good arm performance on average, so the study says little about more severely impaired patients. Several sessions were missed, especially in the ipsilesional cohort, and testing timing varied. The two sites used slightly different neurophysiological methods and different arm scales, and one site did not use neuronavigation. The test mainly reflects LTD-like plasticity, so it may miss other plasticity mechanisms such as LTP. This was an observational physiology study, not a treatment trial, and no therapy was tested.
Declared interests
The authors reported no competing interests. The article is labelled as supported by non-U.S. government funding.
The easy way to misread this
Do not read this as proof that early intensive therapy causes better recovery. The study measured a brain-stimulation response, not a treatment effect, and the early response was not associated with upper limb recovery scores.