Objective To discuss the clinical efficacy of balloon occlusion technique in treating pernicious placenta previa.Methods Between January 2015 and March 2016,a total of 16 matcrnal patients with pernicious placenta previa,who were admitted to the Interventional Department of Qujing Municipal First People's Hospital,received balloon occlusion management to assist obstetrician in dealing with placenta previa.Central type of placenta previa with highly suspected placenta implantation were diagnosed in 15 patients by color ultrasound or MRI.Balloon catheters were placed in bilateral internal iliac arteries before cesarean section was carried out,and immediately after the fetus was taken out the balloons were inflated to temporary occlude the targeted arteries.Based on the hemostatic status the balloon catheters were timely retrieved.One patient received emergency temporary balloon occlusion of abdominal aorta,and laparotomy revealed that the placenta had penetrated to the subserosa of uterine anterior wall,and total hysterectomy had to be carried out.Results Successful balloon occlusion was achieved in all 16 patients.The mean blocking time of the artery was 15 minutes and the amount of blood loss was 300-1200 ml.Conclusion In treating pernicious placenta previa,balloon occlusion treatment before cesarean section is safe and reliable,it can significantly reduce the amount of blood loss during surgery,make quick and effective hemostasis,provide a clear surgical field for the performance of cesarean section,and,more important,save the maternal life.This effective technique has fully showed the necessity of multidisciplinary collaboration,including obstetrics,interventional radiology,etc.

Objective To discuss the clinical application of ultrasound-guided temporary balloon occlusion in performing cesarean section for patients with pernicious placenta previa.Methods At Qujing Municipal First People's Hospital,the Interventional Department and Ultrasonography Department assisted the Obstetrics Department to accomplished cesarean section for 13 patients with pernicious placenta previa.The diagnosis of central placenta previa was confirmed by both color ultrasound and MRI in all the 13 patients.Before cesarean section,the balloons were placed in bilateral common iliac arteries or in abdominal aorta,and the balloons were inflated at the same time when the fetus was delivered so as to temporarily obstruct the target vessels.Based on the hemostatic condition,the balloon was timely withdrawn.Results Among the 13 patients,temporary abdominal aorta occlusion was employed in one and temporary bilateral common iliac artery occlusion in 12.Ultrasound-guided occlusion was successfully accomplished in 12 patients,and the average blocking time was ＜15 min.The amount of intraoperative blood loss was 800-1500 ml.Conclusion Ultrasound-guided temporary balloon occlusion before cesarean section is safe with reliable effect in treating pernicious placenta previa,it can remarkably reduce the amount of intraoperative blood loos,and it has no X-ray radiation damage,therefore,this technique is worthy of clinical application.