Abstract：Objective： To observe the effect of transcutaneous electrical nerve stimulation (TENS) on preventing the formation of previous cesarean scar defect (PCSD). Methods： A total of 151 primary parturients who delivered with cesarean section in the Fourth Affiliated Hospital of Jiangsu University from February 2021 to November 2021 were randomly divided into uterine body sacral tail group (n=51), uterine horn +uterine body sacral tail group (n=50) and control group (n=50). The control group received routine postpartum care; 2 electrodes were applied to the projection site of uterine body surface and the sacral tail 6 hours after cesarean section in the uterine body sacral tail group, and 4 electrodes were applied to the body surface projection of bilateral uterine horns, the projection site of uterine body surface and the sacral tail 6 hours after cesarean section in the uterine horn+ uterine body sacral tail group, and TENS treatment was performed, 20 min per time, once per day, for 3 consecutive days. The uterine size, number of diverticulum formation and size of diverticulum of the three groups were compared at 6 weeks and 6 months after delivery. Results： There was no significant difference in uterine size (uterine length, width and thickness) among the three groups at 6 weeks and 6 months postpartum (P>0.05), but the uterine size of the three groups at 6 months postpartum was significantly smaller than that at 6 weeks postpartum (P<0.01). At 6 weeks and 6 months postpartum, the PCSD formation rate in the uterine body sacral tail group and uterine horn+uterine body sacral tail group was significantly lower than that in the control group (P<0.05), but there was no statistical significance in the PCSD formation rate between the uterine body sacral tail group and the uterine horn+uterine body sacral tail group (P>0.05). There were no significant differences in the changes of diverticulum (diverticulum width, depth and remaining muscle thickness) among the 3 groups at 6 weeks and 6 months postpartum in PCSD patients (P>0.05). Conclusion： The application of TENS 6 hours after cesarean section significantly reduced the formation of PCSD, and there was no significant difference in the effect of reducing the formation of PCSD by using two electrodes or four electrodes. ［Key words］transcutaneous electrical nerve stimulation; previous cesarean scar defect; cesarean delivery; diverticulum
