A systematic review and meta-analysis of Baihui (GV20)-based scalp acupuncture in experimental ischemic stroke

# Baihui Acupuncture in Experimental Treatment of Ischemic Stroke: New Hope Backed by Scientific Evidence

Stroke is one of the leading causes of death and disability worldwide, affecting millions of people each year. In Brazil, stroke is the second leading cause of death and the leading cause of disability. Given the limitations of conventional therapeutic options, which are largely restricted to the use of recombinant tissue plasminogen activator (rt-PA) within 4.5 hours of symptom onset, researchers have turned their attention to complementary therapies such as acupuncture. Acupuncture, used in China for more than 2,000 years to treat stroke, has gained worldwide recognition and is even recommended by the U.S.

National Institutes of Health for post-stroke rehabilitation. Among the various acupuncture techniques, application at the Baihui point, located at the top of the head, has stood out for its potential neuroprotective effects.

This scientific study performed a systematic review and meta-analysis of 54 experimental studies with 1,816 animals to assess the efficacy of acupuncture at the Baihui point (GV-20) in animal models of ischemic stroke. The researchers conducted a thorough search across six scientific databases, from inception through June 2013, including studies in both Chinese and English. Inclusion criteria were strict: only studies that tested acupuncture at the Baihui point in animal models of focal ischemic stroke, with measures of cerebral infarct volume or neurological function score as primary outcomes. The methodology followed rigorous international standards, with two independent reviewers extracting data and assessing study quality using a modified ten-item scale that considers aspects such as randomization, blinded outcome assessment, and temperature control.

The results were remarkably consistent and promising. Twelve studies showed that acupuncture at the Baihui point significantly reduced cerebral infarct volume compared with the untreated control group. Thirty-two studies showed significant improvement in neurological function in treated animals. Benefits were observed across different neurological assessment scales, including the Zealong, Bederson, and Garcia criteria, widely used in experimental stroke research.

The statistical analysis showed that animals treated with acupuncture had better motor recovery, smaller area of brain injury, and better overall neurological function. Interestingly, the study also identified factors that influence treatment efficacy, such as time between stroke onset and treatment, type of anesthetic used, and animal species studied.

For patients and health professionals, these findings represent robust scientific evidence that acupuncture at the Baihui point may have significant neuroprotective effects in ischemic stroke. The proposed mechanisms include improvement of cerebral blood flow, reduction of inflammation, protection of the blood-brain barrier, and promotion of neural regeneration. According to traditional Chinese medicine, the Baihui point, located at the top of the head where all the yang meridians meet, is considered fundamental for clearing the mind, raising the spirit, and promoting resuscitation, and is traditionally used for neurological and psychiatric conditions. For practitioners who already use acupuncture, these results reinforce the importance of including the Baihui point in stroke treatment protocols.

For patients, it represents a potentially effective and safe complementary therapeutic option that can be initiated early after stroke to maximize neurological recovery.

It is important to acknowledge the limitations of this study. The methodological quality of the included studies was generally low, with median scores ranging from 3 to 7 on a 10-point scale. Many studies did not adequately report important aspects such as blinded randomization or sample size calculation. In addition, the research was limited to animal models, and translation of these findings to humans requires caution.

Eight studies were theses not formally published, which may introduce publication bias. The analysis also showed that published studies reported more positive effects than unpublished studies, suggesting possible overestimation of benefits. Despite these limitations, the consistency of positive results across multiple studies and different animal models provides a solid basis for future clinical trials in humans. The researchers emphasize the need for rigorously controlled clinical studies to confirm these promising findings and establish standardized treatment protocols.

Until such studies are performed, acupuncture at the Baihui point should be considered a promising complementary therapy, but not a substitute for established conventional stroke treatments.