A Cochrane review included 17 trials involving 2 566 women. In a single study of 100 women amniotomy and intravenous oxytocin resulted in fewer women being undelivered vaginally at 24 hours than amniotomy alone (RR 0.03, 95% CI 0.001–0.49). Amniotomy and intravenous oxytocin resulted in significantly fewer instrumental vaginal deliveries than placebo (RR 0.18, 95% CI 0.05–0.58). In two studies comparing amniotomy and oxytocin with vaginal PGs (amniotomy or oxytocin was added to PGs in case of no spontaneous labour) there were more postpartum haemorrhage (13.75% vs 2.5%, RR 5.5, 95% CI 1.26–24.07, 160 women).
Comment: The quality of evidence is downgraded by imprecise results (limited study size for each comparison) and by indirectness (no single study addressed all the primary outcomes).