OBJECTIVES: To correlate transvaginal ultrasound findings with mode of delivery in cases of @entity5030 . DESIGN: Cohort study. SETTING: A London Teaching Hospital. METHODS: Retrospective review of all cases of @entity5030 diagnosed by transvaginal ultrasound between February 1997 and March 2002. MAIN OUTCOME MEASURES: Likelihood of vaginal delivery and major obstetric @entity548 . RESULTS: A total of 121 pregnancies were studied with a mean scan-to-delivery interval of 10.5 days. In the 64 @entity1 who laboured, the likelihood of vaginal delivery rose significantly as the placental edge to internal os distance increased. Caesarean section rate was 90% when the placental edge-internal os distance was 0.1 to 2.0 cm, falling to 37% when this measurement was over 2.0 cm (P < 0.00045). CONCLUSION: Trial of vaginal delivery is appropriate in cases with a placental to internal os distance >2 cm. The term "praevia" should be restricted to cases where the placental edge is < or =2 cm from the internal os, as the likelihood of operative delivery and significant postpartum @entity548 is high. Cases where the placenta is more than 2 cm from the internal os have a greater than 60% chance of vaginal delivery and should be defined as "low lying" in order to reduce the clinician's bias towards operative delivery.

Placental edge to internal os distance in the late third trimester and mode of XXXX .

@entity1 :: ('9606', 'Species') :: ['women'] @entity5030 :: ('MESH:D010923', 'Disease') :: ['placenta praevia'] @entity548 :: ('MESH:D006470', 'Disease') :: ['haemorrhage']
@entity5030 :: (MESH:D010923,Disease) :: ['delivery in placenta praevia']
