小儿偏头痛是年长儿常见症状之一 ,其发病率为 2 %～ 5 % [1]。本病病因复杂 ,发病机理尚不完全清楚。目前对其诊断尚无客观的生物指标。为了探讨血小板活化力 (血小板自聚力及血小板内游离 Ca2 +)、血浆内皮素 (ET)及血清镁 (Mg2 +)变化在小儿偏头痛发病机制中的作用 ,为临床 Migraine in children is one of the common symptoms of older children, the incidence rate of 2% to 5% [1]. The etiology of the disease is complicated, the pathogenesis is not yet fully understood. There is currently no objective biological indicator for its diagnosis. In order to investigate the role of platelet activation (platelet aggregation and intracellular free Ca2 +), plasma endothelin (ET) and serum magnesium (Mg2 +) in the pathogenesis of migraine in children,