Correlation between fetal biacromial diameter estimated by ultrasound and shoulder dystocia(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2025年第3期
- Page:
- 369-373
- Research Field:
- 医学影像物理
- Publishing date:
Info
- Title:
- Correlation between fetal biacromial diameter estimated by ultrasound and shoulder dystocia
- Author(s):
- ZHOU Fuqiang; YANG Yating; LIANG Liang; E Zhansen; CHEN Jinhua; HE Xuesen; CAI Yingying; LIU Yuqing
- Department of Ultrasound, Shenzhen Longgang Central Hospital, Shenzhen 518000, China
- Keywords:
- ultrasound; shoulder dystocia; fetal biacromial diameter; macrosomia
- PACS:
- R445.1
- DOI:
- 10.3969/j.issn.1005-202X.2025.03.013
- Abstract:
- Objective To verify the accuracy of Youssef’s formula and evaluate whether fetal biacromial diameter (BA) and other fetal biological diameters estimated by ultrasound can be used to predict macrosomia and shoulder dystocia, so as to provide the possibility for clinical prediction of shoulder dystocia. Methods A total of 200 pregnant women with a gestational period of 37-42 weeks were examined with ultrasound within 3 days before delivery for collecting biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), humerus length (HL), femur length (FL), thoracic transverse diameter and midpoint diameter of upper arm; and the fetal BA was estimated by Youssef’s formula. Neonatal BA, body mass and body length were measured within 1 day after delivery. The above data were analyzed for correlation. Newborns were grouped according to their body mass (macrosomia vs non-macrosomia) and whether they had shoulder dystocia or not (shoulder dystocia vs non-shoulder dystocia). Results (1) The fetal BA estimated by Youssef’s formula was consistent with neonatal BA (P>0.05), and the estimated BA was positively correlated with BPD, HC, AC and neonatal body mass (P< 0.001). (2) The BA, BA/AC and BA/HC in macrosomia group were different from those in non-macrosomia group (P<0.05). ROC curve showed that the sensitivity and specificity were 92.3% and 88.2% for macrosomia prediction when the estimated BA threshold was 16.05 cm, and those were 61.5% and 77.0% when BA/AC threshold was 0.455, and 76.9% and 72.7% when BA/HC threshold was 0.465. (3) Shoulder dystocia group had neonatal weight close to non-shoulder dystocia group (P> 0.05), but higher BA/BPD, BA/HC and BA-BPD (P<0.05). ROC curve showed that the sensitivity and specificity were 100.0% and 66.8% for shoulder dystocia when BA threshold was 15.45 cm, 100.0% and 80.6% when BA/BPD threshold was 1.695, 100.0% and 81.6% when BA/HC threshold was 0.475, and 100.0% and 76.0% when the threshold difference between BA and BPD was 6.35 cm. Conclusion Fetal BA, BA/BPD, BA/HC, BA/AC and BA-BPD may be effective predictors of shoulder dystocia and macrosomia.
Last Update: 2025-03-27