%0 Journal Article
%T Sonographic parameters for diagnosing fetal head engagement during labour
%A Alexander T Odoi
%A Bill Whitehead
%A Heather Venables
%A Yaw A Wiafe
%J Ultrasound
%@ 1743-1344
%D 2018
%R 10.1177/1742271X18755080
%X The purpose of this study was to investigate the diagnostic performance of the head每perineum distance, angle of progression, and the head每symphysis distance as intrapartum ultrasound parameters in the determination of an engaged fetal head. Two hundred and one women in labour underwent both ultrasound and digital vaginal examination in the estimation of fetal head station. The transperineal ultrasound measured head每perineum distance, angle of progression, and head每symphysis distance for values correlating with digital vaginal examination head station. Using station 0 as the minimum level of head engagement, correlating cut-off values for head每perineum distance, angle of progression, and head每symphysis distance were obtained. Receiver operating characteristics were used in determining the diagnostic performance of these cut-off values for the detection of fetal head engagement. With head每perineum distance of 3.6ˋcm the sensitivity and specificity of sonographic determination of engaged fetal head were 78.7 and 72.3%, respectively. A head每symphysis distance of 2.8ˋcm also had sensitivity and specificity of 74.5 and 70.8%, respectively, in determining engagement, whilst an angle of progression of 101∼ was consistent with engagement by digital vaginal examination with 68.1% sensitivity and 68.2% specificity. Ultrasound shows high diagnostic performance in determining engaged fetal head at a head每perineum distance of ≒3.6ˋcm, head每symphysis distance of ≒2.8ˋcm, and angle of progression ofˋ≡ˋ101∼
%K Angle of progression
%K head每perineum distance
%K head每symphysis distance
%K engaged fetal head
%U https://journals.sagepub.com/doi/full/10.1177/1742271X18755080