Neurobiological mechanisms of acupuncture for post-ischemic stroke comorbid insomnia and cognitive impairment: a narrative review.

Stroke survivors often experience two overlapping problems—insomnia and cognitive difficulties—that create a vicious cycle hindering recovery. Researchers reviewed recent scientific evidence to understand how acupuncture might help break this cycle by examining its effects on the brain and body. This narrative review analyzed both clinical studies in humans and laboratory research to identify the biological mechanisms behind acupuncture's therapeutic effects. The findings reveal that acupuncture works through multiple pathways simultaneously. It influences key brain signaling proteins (BDNF-TrkB-PI3K/Akt pathway) that support neuron survival and growth, protects blood vessels in the brain, restores the connection between gut health and brain function, normalizes the body's internal clock and immune responses, and reshapes brain networks involved in memory and attention. By addressing both sleep quality and cognitive function together, acupuncture appears to improve not just individual symptoms but overall daily functioning and quality of life after stroke. The Traditional Chinese Medicine approach of "regulating Shen and re-animating the brain" provides bidirectional benefits—improving sleep helps cognition, and better cognitive function supports healthier sleep patterns. However, researchers note important limitations: studies reviewed had small numbers of participants, short follow-up periods, and used varying acupuncture protocols (different point selections and treatment frequencies). Future research needs larger trials with standardized treatment approaches to determine the most effective protocols. For stroke survivors struggling with both sleep and cognitive problems, acupuncture shows promise as a complementary therapy, though more rigorous research is needed. Patients considering acupuncture should seek treatment from a licensed acupuncturist with experience in neurological conditions.

This narrative review synthesizes clinical and pre-clinical evidence on acupuncture's neurobiological mechanisms for post-stroke insomnia with cognitive impairment (PS-ICI). The condition involves hippocampal-prefrontal circuitry dysfunction creating a sleep-cognition vicious cycle with concurrent sleep architecture disruption and cognitive decline. Acupuncture demonstrates bidirectional modulation through five primary mechanisms: regulation of BDNF-TrkB-PI3K/Akt signaling promoting neuroprotection, preservation of neurovascular unit integrity, restoration of gut-brain axis homeostasis, normalization of circadian immune rhythms, and default-mode network (DMN) plasticity reshaping. The TCM framework of "regulating Shen and re-animating the brain" guides treatment approach. Clinical outcomes show improvements in functional capacity and activities of daily living. Significant limitations include small sample sizes, brief follow-up periods, and heterogeneity in acupuncture parameters (point selection and frequency). The qualitative integrative methodology reflects high study heterogeneity. Future research priorities include standardized protocols, pathway interaction analysis, and multi-omic integration for precision medicine applications in PS-ICI management.