Critical role of high-dose Astragalus in Buyang Huanwu Decoction for enhancing neurovascular coupling in a Qi Deficiency and Blood Stasis animal model. - Hu K; Yang J; Wei G; Zhao Y; Chu S; Li L; Wang S; Qu S; Chen L; Zhang Y; Yan X; Zhang Z; et al. (Chinese medicine, 2026)