Discussion
RA
PROGRESSION
The findings from this study indicated that trans-labial ultrasound was more effective than manual vaginal examination in the labor process, and accurate prediction of delivery types. Similar findings were reported from studies that assessed AoP and RA. They showed that trans-perineal ultrasound could successfully predict vacuum extraction failure and vaginal birth following induction of labor [The findings indicated that the prediction of duration of vaginal birth was increased if the Angle of Progression in zero and positive stations locate at 135 to 180 degrees (Table The current study showed that sensitivity for trans-labial ultrasound was 91.6%, while sensitivity for the routine vaginal examination was 75.54% (Table Although the present study was focused on assessing the prediction of duration of vaginal delivery and the AoP measurement by expert manual segmentation, we also found a good agreement between a range of AoP values and the occurrence of The findings from the current study showed that the majority of women with a final RA of the fetal head above 60 degrees had vaginal birth while the value for those who had cesarean section was less than 30 degrees (Table 