Aim: Evaluation of the role of head progression distance (PD) using the transperineal ultrasound (TPUS) in assessment of
progress of labor.
Materials and Methods: This study conducted on 60 cases admitted to El-Shatby Maternity University Hospital in active
phase of labor, at full term with singleton pregnancy presented by vertex. We measured the head progression distance (PD) in
each case on admission, after 1 hour and after 2 hours (using transperineal ultrasound) and correlated it with the Bishop score
by digital examination. We documented also the mode of delivery in all cases.
Results: The mean head progression distance (PD) had a statistically significant association with the fetal head station on
admission, after 1 hour and after 2 hours. HPD will get longer with the progress of labor with the fetal head descent. The
sensitivity of Bishop score on admission to predict the mode of delivery was 58.33% at cut-off 7, after 1 hour it was 75%
at cut-off 9 and after 2 hours it was 91.67% at cut-off 10. The sensitivity of head progression distance (PD) on admission to
predict the mode of delivery was 66.67% at cut-off 44mm, after 1 hour it was 75% at cut-off 51mm and after 2 hours it was
91.67% at cut-off 63mm.
Conclusion: Head progression distance (PD) measurement using intrapartum transperineal ultrasound (TPUS) is correlated
with Bishop score using digital examination. The increasing PD with progress of labor is associated with more likelihood of
vaginal delivery. PD can be used for objective assessment of progress of labor.