The mechanism of electroacupuncture treatment for post-stroke spasticity: A systematic review and Meta-analysis.

Researchers conducted a comprehensive review of 20 animal studies involving 388 subjects to understand how electroacupuncture (EA) helps reduce muscle stiffness and spasticity that often occurs after a stroke. Post-stroke spasticity causes involuntary muscle tightness that interferes with movement and daily activities, affecting many stroke survivors during recovery.

The study found that electroacupuncture significantly improved neurological function and reduced muscle spasticity compared to control groups. Animals receiving EA treatment showed better coordination, balance, and movement scores. The treatment also reduced brain swelling and the size of damaged brain tissue following stroke.

Researchers identified several biological mechanisms explaining these improvements. Electroacupuncture appeared to work by balancing important brain chemicals called neurotransmitters, particularly GABA and glutamate, which control muscle tone and nerve signaling. The treatment reduced inflammation in the brain by lowering inflammatory markers like IL-6 and TNF-α. It also protected brain cells from oxidative stress damage and supported the growth and repair of neurons by increasing protective factors like BDNF.

The evidence quality was moderate, with study scores averaging 6.1 out of 10. Some variation existed in treatment protocols, including which acupuncture points were used, electrical stimulation settings, and treatment duration, which may have affected results.

For stroke survivors experiencing muscle spasticity, these findings suggest electroacupuncture may offer meaningful benefits as part of a comprehensive rehabilitation program. The treatment appears to address multiple underlying causes of post-stroke spasticity simultaneously. If you're considering electroacupuncture for post-stroke recovery, consult with a licensed acupuncturist experienced in neurological rehabilitation and coordinate with your stroke care team.

This systematic review and meta-analysis evaluated electroacupuncture efficacy for post-stroke spasticity across 20 preclinical studies (n=388 animals). Quality assessment using SYRCLE and CAMARADES tools yielded mean scores of 6.1/10. Primary outcomes demonstrated significant improvements: Zea Longa score (MD=-1.05, 95% CI -1.30 to -0.80, P<0.001) and Modified Ashworth Scale (MD=-1.06, 95% CI -1.43 to -0.69, P<0.001). EA significantly reduced cerebral infarct volume, edema severity, and inflammatory markers (IL-6, TNF-α). Mechanistic findings revealed EA modulates GABAergic-glutamatergic neurotransmission, downregulating GABA-T and glutamate while upregulating GAD67 and GABA levels. Treatment enhanced antioxidant markers (GSH, SLC7A11, GPX4) and neurotrophic factors (BDNF, TrkB with mRNA expression). Publication bias was detected in MAS assessments; heterogeneity in waveform parameters, acupoint selection, and treatment duration likely contributed to outcome variability. Clinical translation requires protocol standardization and human trials validating these neuroprotective mechanisms.