Cognitive impairment is one of the most debilitating sequelae of stroke, affecting memory, attention, language, and executive functions in up to 80% of survivors in the first months after the event. A new network meta-analysis published in Frontiers in Neurology brought together evidence from 70 randomized clinical trials, involving 6,259 patients, to compare 25 rehabilitation strategies based on medical acupuncture. The results indicate that multimodal approaches — combining acupuncture with non-invasive brain stimulation or cognitive training — consistently surpass isolated interventions.
META-ANALYSIS NUMBERS
How the study was conducted
Researchers Tingting Yin and Peifang Li performed a systematic search in multiple international and Chinese databases. The analysis employed a Bayesian network meta-analysis methodology, allowing direct and indirect comparisons among all 25 evaluated therapeutic regimens. The quality of the evidence was ranked by the SUCRA model (Surface Under the Cumulative Ranking Curve), which generates a probabilistic ranking for each intervention on each clinical outcome.
Main results
The primary outcomes evaluated were the MoCA (Montreal Cognitive Assessment) and the MMSE (Mini-Mental State Examination), two widely validated instruments for cognitive screening. In addition to them, functionality for activities of daily living (Barthel index) and the global efficacy rate were also measured.
BEST INTERVENTIONS BY OUTCOME
For the MoCA, the combination of scalp acupuncture with non-invasive brain stimulation and standard care presented the largest effect size (SMD = 1.89), indicating substantial improvement in the global cognitive assessment. On the MMSE, the combination of body acupuncture with cognitive training reached an even more expressive result (SMD = 2.41). For the global efficacy rate, electroacupuncture combined with cognitive training and standard care obtained the best ranking (RR = 2.18), more than doubling the probability of clinical response compared with isolated standard care.
Why are multimodal strategies superior?
The central conclusion of the meta-analysis is that multimodal strategies surpass isolated modalities in post-stroke cognitive rehabilitation. This aligns with current understanding in neuroscience: cognitive recovery after brain injury depends on neuroplasticity, and different stimuli activate complementary pathways. Scalp acupuncture can modulate local cortical circuits, while non-invasive brain stimulation expands neuronal excitability in regions adjacent to the lesion. Cognitive training, in turn, provides the functional substrate to consolidate the induced neuroplastic adaptations.
Limitations and considerations
As with any systematic review, the results depend on the quality of the included primary studies. The authors identified significant heterogeneity in some outcomes and acknowledge that most trials were conducted in China, which may limit direct generalization to other populations. In addition, acupuncture protocols varied between studies regarding the number of sessions, points used, and duration of treatment. Even só, the prior PROSPERO registration and the robustness of the Bayesian methodology employed confer solidity to the general conclusions.
Frequently Asked Questions
It is the partial or total loss of cognitive functions — such as memory, attention, language, and planning capacity — that occurs after a stroke. It can affect up to 80% of survivors and significantly impacts quality of life and functional independence.
Scalp acupuncture uses specific points on the scalp that correspond to functional cortical áreas. The stimulation of these points may modulate neuronal activity, improve regional cerebral blood flow, and promote neuroplasticity in áreas adjacent to the stroke lesion.
Most of the included studies evaluated patients in the subacute phase (up to 6 months after stroke). The evidence is most robust for this temporal window, although some trials have also demonstrated benefits in the chronic phase. Early initiation of rehabilitation tends to produce better results.
It refers to techniques such as repetitive transcranial magnetic stimulation (rTMS) and transcranial direct current stimulation (tDCS), which modulate neuronal excitability without the need for surgical procedure. The combination of these techniques with acupuncture demonstrated superior results in the meta-analysis.
No. The meta-analysis evaluated acupuncture as a complementary therapy to standard care, which includes physical therapy, speech therapy, and occupational therapy. The best results were obtained precisely when medical acupuncture was combined with other interventions, reinforcing the multimodal approach coordinated by the physician.
Founded in 1989 by physicians trained at the University of São Paulo (USP) and specialized in China, CEIMEC is a Brazilian national reference in the teaching and practice of medical acupuncture. With more than 3,000 physicians trained over 35 years, it collaborates with HC-FMUSP and is recognized by the Brazilian Medical College of Acupuncture (CMBA/AMB).
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