Qin Y, Wang C C, Lau T K, Rogers M S
Department of Obstetrics and Gynaecology, Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR.
Ultrasound Obstet Gynecol. 2000 May;15(5):413-7. doi: 10.1046/j.1469-0705.2000.00113.x.
To compare the accuracy of intrapartum ultrasound with and without color Doppler for identification of nuchal cord displacement during labor.
180 normal pregnant women, admitted in labor, or for induction to labor, were examined independently by two researchers, using either conventional real-time gray-scale imaging or color Doppler imaging. A repeat examination was performed by the other researcher using the other ultrasound modality. Nuchal cord displacement was classified as either negative, definite or suspicious. Nuchal cord at birth was classified as either tight or loose.
Sixty-two (34%) cases examined using the two ultrasound imaging modalities presented with nuchal cord at delivery. The sensitivity of color Doppler was 96.8%. The accuracy of color Doppler in detecting nuchal cord during labor was significantly better (P < 0.05) than gray-scale imaging alone. The results of a restricted sequential t-test analysis of 53 un-tied pairs showed an overall preference in favor of color Doppler assessment: statistical significance (P < 0.01) was reached after 41 un-tied pairs.
The tight and loose nuchal cord could not be distinguished by ultrasound. Color Doppler imaging can provide useful additional information to gray-scale imaging in the detection of nuchal cord displacement during labor.
比较产时超声检查（有无彩色多普勒）在分娩期间识别脐带绕颈移位的准确性。
180例正常孕妇，已临产或计划引产，由两名研究人员分别使用传统实时灰阶成像或彩色多普勒成像进行独立检查。另一名研究人员使用另一种超声模式进行重复检查。脐带绕颈移位分为阴性、明确或可疑。出生时脐带绕颈分为紧或松。
使用两种超声成像模式检查的62例（34%）病例在分娩时出现脐带绕颈。彩色多普勒的敏感性为96.8%。彩色多普勒在分娩期间检测脐带绕颈的准确性明显优于单独的灰阶成像（P<0.05）。对53对未捆绑对子进行的受限序贯t检验分析结果显示，总体上更倾向于彩色多普勒评估：在41对未捆绑对子后达到统计学显著性（P<0.01）。
超声无法区分脐带绕颈的松紧情况。彩色多普勒成像在分娩期间检测脐带绕颈移位方面可为灰阶成像提供有用的额外信息。
