Abstract：
External cephalic version is a procedure used to turn a fetus from a breech position to a cephalic position before delivery. The success rate of the external cephalic version can be affected by various factors; however, the effect of bladder volume on the success rate of the external cephalic version remains controversial.
This study aimed to determine the effect of urinary bladder status (full or empty) on the success rate of the external cephalic version through a prospective randomized study.
This was a prospective randomized controlled trial conducted at a tertiary care obstetrical center. Overall, 70 women with a singleton breech presentation at term undergoing external cephalic version were randomly allocated into 2 groups: external cephalic version with an empty bladder and external cephalic version with a full bladder. The external cephalic version procedure was performed by experienced obstetricians under ultrasound guidance. The primary outcome was the success rate of the external cephalic version.
The success rate of the external cephalic version was 67.56% (25/37) in the full bladder group and 54.54% (18/33) in the empty bladder group, with no statistically significant difference between the groups (P=.26). In addition, the relative risk of successful external cephalic version was 1.23 (95% confidence interval, 0.84-1.81), indicating no significant difference.
This randomized controlled trial demonstrated that the presence of a full or empty urinary bladder does not significantly affect the success rate of the external cephalic version in women with singleton breech presentation at term. Our findings suggest that women undergoing an external cephalic version do not need to have a full bladder to improve the success rate of the procedure.
This study aimed to determine the effect of urinary bladder status (full or empty) on the success rate of the external cephalic version through a prospective randomized study.
This was a prospective randomized controlled trial conducted at a tertiary care obstetrical center. Overall, 70 women with a singleton breech presentation at term undergoing external cephalic version were randomly allocated into 2 groups: external cephalic version with an empty bladder and external cephalic version with a full bladder. The external cephalic version procedure was performed by experienced obstetricians under ultrasound guidance. The primary outcome was the success rate of the external cephalic version.
The success rate of the external cephalic version was 67.56% (25/37) in the full bladder group and 54.54% (18/33) in the empty bladder group, with no statistically significant difference between the groups (P=.26). In addition, the relative risk of successful external cephalic version was 1.23 (95% confidence interval, 0.84-1.81), indicating no significant difference.
This randomized controlled trial demonstrated that the presence of a full or empty urinary bladder does not significantly affect the success rate of the external cephalic version in women with singleton breech presentation at term. Our findings suggest that women undergoing an external cephalic version do not need to have a full bladder to improve the success rate of the procedure.
摘要：
背景：头颅外型是一种用于在分娩前将胎儿从臀位转向头位的手术。外部头部版本的成功率会受到各种因素的影响；但是，膀胱容量对头颅外型成功率的影响仍存在争议。
目的：本研究旨在通过一项前瞻性随机研究确定膀胱状态（满或空）对外头型成功率的影响。
方法：这是一项在三级护理产科中心进行的前瞻性随机对照试验。总的来说,70名接受外头手术的足月有单胎臀位的妇女被随机分为两组：外头手术伴膀胱空膀胱和外头手术伴膀胱全膀胱。由经验丰富的产科医生在超声引导下进行外部头颅手术。主要结果是外部头部版本的成功率。
结果:全膀胱组外头型成功率为67.56%(25/37),空膀胱组成功率为54.54%(18/33),两组之间无统计学差异（P=0.26）。此外,成功的外部头颅版本的相对风险为1.23（95％置信区间，0.84-1.81),表明无显著差异。
结论：这项随机对照试验表明，在足月有单胎臀位表现的女性中，膀胱充满或空的存在并不会显著影响头颅外的成功率。我们的发现表明，接受外头手术的女性不需要有一个完整的膀胱来提高手术的成功率。
目的：本研究旨在通过一项前瞻性随机研究确定膀胱状态（满或空）对外头型成功率的影响。
方法：这是一项在三级护理产科中心进行的前瞻性随机对照试验。总的来说,70名接受外头手术的足月有单胎臀位的妇女被随机分为两组：外头手术伴膀胱空膀胱和外头手术伴膀胱全膀胱。由经验丰富的产科医生在超声引导下进行外部头颅手术。主要结果是外部头部版本的成功率。
结果:全膀胱组外头型成功率为67.56%(25/37),空膀胱组成功率为54.54%(18/33),两组之间无统计学差异（P=0.26）。此外,成功的外部头颅版本的相对风险为1.23（95％置信区间，0.84-1.81),表明无显著差异。
结论：这项随机对照试验表明，在足月有单胎臀位表现的女性中，膀胱充满或空的存在并不会显著影响头颅外的成功率。我们的发现表明，接受外头手术的女性不需要有一个完整的膀胱来提高手术的成功率。
