Fig. 1From: The utilization of transperineal ultrasound following fetal heart deceleration after epidural analgesia: a case reportThe variation of transperineal ultrasound measured at rest with fetal heart deceleration associated with initiation of epidural labor analgesia. Transperineal ultrasound (TPU) was performed before epidural analgesia and after epidural analgesia was attained. The anteroposterior diameter of the levator hiatus (APD) increased from 5.3 to 6.6 cm and angle of progress (AoP) increased from 113° to 133°Back to article page