Abstract
OBJECTIVE: We aimed to assess the accuracy of intrapartum transperineal ultrasonography that is non-invasive, easy to learn, rapid to perform, comfortable for pregnant women, and low-cost method to evaluate the progress of labor objectively.STUDY DESIGN: We evaluated two hundred-ten singleton pregnant women at term with cephalic presentation who went into active labor via intrapartum transperineal ultrasonography using the angle of progression and head-perineum distance. Maternal characteristics, conventional vaginal examination findings, mode of delivery, and neonatal results were noted. The data were compared using correlation and regression analysis.RESULTS: The relationships between the descent of clinical fetal head station, the increase of angle of progression (p=0.001), and the decrease of head-perineum distance (p=0.001) were statistically significant. The receiver operating characteristics curve showed that measurement of angle of progression with <110.5 degrees (p=0.001) and measurement of head-perineum distance with >52.5 millimeters (p=0.001) were associated with emergent cesarean delivery. For the prediction of delivery mode, both angle of progression and head-perineum distance had high sensitivity and specificity.CONCLUSIONS: Intrapartum transperineal ultrasonography parameters were in agreement with each other and conventional vaginal examination for determination of delivery mode. Head-perineum distance was a parity-dependent measurement whilst angle of progression was parity-independent.
Highlights
Traditional vaginal examination together with intermittent maternal and fetal monitoring is still the mainstay of monitoring labor in low-risk pregnancies
The receiver operating characteristics curve showed that measurement of angle of progression with 52.5 millimeters (p=0.001) were associated with emergent cesarean delivery
Intrapartum transperineal ultrasonography parameters were in agreement with each other and conventional vaginal examination for determination of delivery mode
Summary
Traditional vaginal examination together with intermittent maternal and fetal monitoring is still the mainstay of monitoring labor in low-risk pregnancies. Quick Response Code: Access this article online. Gynecol Obstet Reprod Med. 2021;27(2):116122 latation and effacement of the cervix. This has lead researchers to explore more objective methods for the management of labor. There is no evidence of the usefulness of pelvimetry except clinical pelvimetry due to various factors such as uterine activity, relaxation of maternal pelvis, and molding of the fetal head. Measurement of head-perineum distance (HPD) was first reported [1] and followed by the angle of progression (AOP) [2,3]. Their consistency with the clinical fetal head station (CFHS) and success of prediction the delivery mode was reported. We aimed to assess whether AOP and HPD correlate with each other and CFHS and they predict the mode of delivery
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
