Ultrasound Assessment of Changes in Muscle Architecture of the Brachialis Muscle After Stroke-A Prospective Study.
Keng He Kong, Tham Shuen-Loong, Matthew Rong Jie Tay and 3 others
PMID 36123972WHAT IT FOUND
In the first 7 months after stroke, the brachialis muscle on the affected arm thinned and its quality worsened, while the unaffected arm stayed stable.
Older patients lost more muscle. Spasticity appeared to temporarily protect muscle mass at 1 month, but this faded by 6 months.
Key findings
01Muscle thickness in the hemiparetic brachialis significantly decreased from baseline to 6 months, while the nonhemiparetic side remained stable.
02Echo intensity, a marker of muscle quality, significantly increased over time in the hemiparetic brachialis, indicating progressive replacement of muscle with fat or fibrosis.
03Age was inversely correlated with muscle thickness, meaning older patients experienced greater muscle loss over time.
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
Small sample size (50 patients) with substantial dropout (12 patients lost by 6 months). Examiners were not blinded to previous findings, which could introduce bias in ultrasound measurements. The study did not control for familywise error rate in statistical analyses. Only the brachialis muscle was assessed, so findings may not apply to other upper limb muscles. Rehabilitation intensity was not measured, so its influence on muscle changes is unknown.
Declared interests
No conflicts of interest or funding sources were reported in the provided text.
The easy way to misread this
Do not assume spasticity is a reliable long-term protector of muscle mass. The study found that while spasticity was associated with better muscle thickness and quality at 1 month, this association disappeared by 6 months, and muscle loss continued regardless.