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目的:观察艾灸治疗寒湿凝滞型原发性痛经的量-效关系,探讨灸量的最优选择,为艾灸治疗取得较好疗效提供依据.方法:将90例寒湿凝滞型原发性痛经患者根据随机数字表法分为3组,每组30例.三组均艾灸关元穴.A组艾灸治疗20 min,B组艾灸治疗40 min,C组艾灸治疗60 min.观察艾灸后患者疼痛症状评分变化.结果:治疗后,3组临床疗效有统计学差异(P<0.05);B组和C组疗效优于A组(P<0.05),B组疗效优于C组(P<0.05).治疗后,3组患者的疼痛症状积分与本组治疗前均有统计学差异(均P<0.05),3组疼痛症状积分差异有统计学意义(P<0.05),B组和C组疼痛症状积分均低于A组(P<0.05),B组疼痛症状积分低于C组(P<0.05).结论:在艾灸刺激频次和介入时间相同的条件下,40 min艾灸治疗对寒湿凝滞型原发性痛经的疗效较好.“,”Objective: To observe the time-effect relationship of moxibustion for primary dysmenorrhea (PD) due to stagnation and congelation of cold-damp, thus explore the optimal choice of moxibustion duration, and provide evidence for achieving satisfactory efficacy in moxibustion treatment. Methods: A total of 90 patients with PD due to stagnatin and congelation of cold-damp were divided into three groups by the random number table method, with 30 cases in each group. All the patients in the three groups were given moxibustion treatment at Guanyuan (CV 4), 20 min in group A, 40 min in group B and 60 min in group C. The changes in the pain measurement score in the three groups were observed after treatment. Results: After treatment, there were significant differences in the clinical efficacy among the three groups (P<0.05); the clinical efficacy was better in group B and group C than that in group A (P<0.05), and that in group B was better than that in group C (P<0.05). Besides, the pain measurement score changed significantly after treatment in the three groups (all P<0.05), and the between-group differences were also statistically significant (P<0.05); the pain measurement scores in group B and group C were lower than that in group A (P<0.05), and that in group B was lower than that in group C (P<0.05). Conclusion: Given the same stimulating frequency and intervention time of moxibustion, 40-minute duration demonstrates relatively better efficacy for PD due to stagnation and congelation of cold-damp.