Prelabour rupture of membranes at term: early induction of labour versus expectant management.

OBJECTIVES: To compare expectant management with early induction of labour in pregnant patients with prelabour rupture of membranes at term and unfavourable cervix.

STUDY DESIGN: A prospective, randomised study of 154 women with prelabour rupture of membranes at term of whom 80 had been managed expectantly, and 74 had undergone oxytocin induction at a rate of 2.5 mU/min. Digital examination was not performed before oxytocin infusion, and the first was delayed until 4 h (nulliparae), or 2 h (multiparae) of regular uterine contractions.

RESULTS: The mean period from rupture of membranes to delivery was significantly shorter in the induction group. The mean duration of labour was significantly shorter in the expectant group. Operative vaginal deliveries were more common in the induction group, and fetal distress was the most common cause of operative vaginal deliveries. The caesarean rates were low and similar in both groups. Maternal and neonatal infectious morbidity was similar and no difference was found in the length of hospitalisation.

CONCLUSIONS: Expectant management in patients with ruptured membranes at term is safe and reduces the frequency of operative vaginal deliveries.