To assess whether ultrasound methods can predict outcome of operative vaginal deliveries in nulliparous women at term with singleton pregnancies and prolonged second stage of labor. To compare different ultrasound assessments Compare digital assessments and ultrasound findings. Investigate if movement of the fetal head during active pushing is a predictive factor Null hypotheses: * Ultrasound measurements cannot predict outcomes of operative vaginal delivery. * Ultrasound is not better than digital examination in predicting delivery outcome. * Movement of fetal head with active pushing is not a predictive factor.
Age range
16 Years – 45 Years
Sex
FEMALE
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Time from start of vacuum assisted traction to delivery
Timeframe: Active second stage of labor to1 hour after delivery