核磁共振成像在前置胎盘诊断中的应用价值

目的 探讨MRI在前置胎盘诊断中的应用价值.方法 回顾性分析温州医科大学附属第二医院产科2010年1月～2013年9月收治的74例经剖宫产手术确诊为前置胎盘患者的临床资料,所有患者产前均进行多普勒超声及MRI检查了解胎盘位置,并与剖宫产术中所见结果进行比较.结果 所有患者经剖宫产终止妊娠并明确胎盘位置,其中完全性前置胎盘49例,部分性前置胎盘7例,边缘性前置胎盘18例,多普勒超声诊断完全符合63例,符合率为85.1％（63/74）,MRI诊断完全符合71例,符合率为95.9％（71/74）,两种检查方法诊断符合率比较差异有统计学意义（P＜0.05）.结论 MRI检查的诊断符合率较B超检查更高,且应用MRI检查可对前置胎盘的位置、范围进行精确定位,更有利于临床医生对其进行术前评估.

Value of magnetic resonance imaging in diagnosis of placenta previa

Objective To investigate the value of magnetic resonance imaging （MIR） in the diagnosis of placenta previa. Methods We collected 74 cases, which were diagnosed as placenta previa by cesarean section from the department of ob- stetrics, the second affiliated hospital of wenzhou medical university from January 2010 to September 2013 and retrospec- tively analyzed those cases. All patients were performed prenatal Doppler ultrasound and MRI, and the findings were com- pared with the results seen in the cesarean section. Results The pregnancies were terminated via caesarean section and the locations of placenta were clearly determined in all patients. Among these cases, complete placenta previa was found in 49 cases, partial placenta previa in 7 cases, and marginal placenta previa in 18 cases. Of these 74 women with placenta previa, 63 were correctly diagnosed by doppler ultrasound, with coincidence rate of 85.1%, while, 71 were correctly diagnosed by MRI, with coincidence rate of 95.9%. The difference in the coincidence rate of ultrasound and MRI was statistically sig- nificant （ P〈0.05）. Conclusion The coincidence rate by MRI was higher than that by doppler ultrasound. The applica- tion of MRI can pinpoint the location and scope of the placenta previa, which is more conducive to preoperative assessment by clinicians.