Objective To compare the cumulative analgesic effect of electroacupuncture(EA)stimulation of Sanyinjiao(SP 6)

Xuanzhong(GB 39)and non-acupoint for primary dysmenorrhea patients.Methods A total of 200patients with primary dysmenorrhea were randomly assigned to Sanyinjiao(SP 6

a dysmenorrheal-relieving related acupoint)group

Xuanzhong(GB 39

an unrelated acupoint)group

non-acupoint group and control group

with 50cases in each group.The participants were administered with EA(2Hz/100Hz

0.5-1.6mA)at SP 6

GB 39and non-acupoint for 30min

once daily for 3consecutive days.The intensity of the pain was ranked from 0(no pain)to 100(intolerable)using visual analogue scale(VAS)and RSS(Cox retrospective symptom scale)severity rating scores(RSS-COX 2)before and after three interventions.Results In comparison with the control group

VAS and RSS-COX 2scores were significantly lower in the SP 36

GB 39and non-acupoint groups(P<0.001

P<0.05)

suggesting an alleviation of the pain severity after EA treatment.No significant differences were found among the three treatment groups in both VAS and RSS-COX 2scores(P>0.05).Conclusion EA stimulation of SP 6

GB 39and non-acupoint has a good cumulative analgesic effect in patients with primary dysmenorrhea.