![]() 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. 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 haemorrhage is high. 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 2 cm. In the 64 women who laboured, the likelihood of vaginal delivery rose significantly as the placental edge to internal os distance increased. Likelihood of vaginal delivery and major obstetric haemorrhage.Ī total of 121 pregnancies were studied with a mean scan-to-delivery interval of 10.5 days. The minimum distance from one countersink and an edge is four times the material thickness. ![]() The minimum distance between two countersinks is eight times the material thickness. A minimum of 50 contact between the hardware and the countersink is required. ![]() Retrospective review of all cases of placenta praevia diagnosed by transvaginal ultrasound between February 1997 and March 2002. The maximum depth is 3.5 times the material thickness at an angle of the hardware. To correlate transvaginal ultrasound findings with mode of delivery in cases of placenta praevia.
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