Immediate analgesic effect of needling acupoints (bilateral De Qi vs unilateral De Qi) on primary dysmenorrhea: a multi-center, randomized, controlled trail

Bilateral De Qi was possibly superior to unilateral De Qi in enhancing the immediate analgesic effect of needling the acupoints, but no statistical significance was observed on the patients of needling at non acupoint, which preliminarily suggested this immediate analgesic effect was perhaps along meridians.