Objective To observe the influence of low-intensity focused ultrasound on uterine involution after cesarean section. Methods By adopting the prospective study method,73 cases of cesarean section were randomly selected and divided into the control group(41 cases) and the ultrasonic treatment group(32 cases). The control group had natural uterine involution, while the ultrasonic treatment group adopted the Ashi ultrasonic treatment instrument for conducting the therapy on the body sur-face projection parts of bilateral uterine horns at postoperative 24 h,once daily,15 min at each uterine horn(30 min for two uterine horns),for consecutive 3 d. The effectiveness study:the lochia amount on 3 d,uterine fundus decline situation and lochia persis-tent time in 35 d after treatment,the sum of three uterine diameters on 1 d after cesarean section and uterine effusion on39 d after treatment were observed by B type ultrasound. The incidence rate of postpartum hemorrhage and puerperal infection of two groups were recorded also. The safety study:the local feeling and skin conditions were observed during the treatment period. Results (1)The clinical observation:no significantly difference was found in the general condition of the two groups (P>0.05). The lochia amount during 3 d treatment and lochia duration wthin 35 d after treatment in the treatment group were significantly less than those in the control group(P<0.05). The descending degree of uterine fundus in the treatment group was significantly more than that in the control group(P<0.05). No postpartum hemorrhage and puerperal infection occurred during the observation period in the two groups. (2)The ultrasound examination:the sum of uterine 3 diameters on 1 d after treatment in the experimental group was significantly less than that in the control group(P<0.05). The incidence rate of uterine cavity effusion on 39 d after treatment in the treatment group was significantly lower than that in the control group(P<0.05).(3)The safety observation:no adverse reactions of local paresthesia,skin burns, etc. were observed during treatment period. Conclusion The Low-intensity focused ultrasound can promote uterine involution without obvious adverse reactions.%目的观察低强度聚焦超声对剖宫产术后子宫复旧的影响。方法采用前瞻性研究方法，随机选择73例剖宫产术后产妇，其中对照组41例自然恢复；超声治疗组32例，于手术后24 h用阿是超声波治疗仪对产妇两侧宫角体表投影部位进行治疗，每天1次，每次两侧宫角各15 min（共30 min），连续3 d。有效性研究：临床观测两组治疗时3 d恶露量、宫底下降情况及治疗后35 d内的恶露持续时间；B超观察剖宫产治疗后第1天子宫三径之和及治疗后第39天子宫积液情况。并记录两组患者产后出血率和产褥感染率。安全性研究：观察治疗期间局部感觉、皮肤情况。结果（1）临床观测：两组患者一般状况无差异，治疗组治疗时3 d恶露量、恶露持续时间明显少于对照组（P＜0.05）；宫底下降程度明显大于对照组（P＜0.05）；两组均无产后出血及产褥感染患者。（2）B超检测：治疗组治疗后第1天子宫三径之和明显小于对照组（P＜0.05）；治疗后第39天子宫积液率治疗组明显低于对照组（P＜0.05）。（3）安全性观察：治疗期间未出现局部感觉异常及皮肤灼伤等不良反应。结论低强度聚焦超声治疗可促进产后子宫复旧，且无明显不良反应。
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