Transabdominal and transvaginal ultrasonography of placenta previa.

摘要

In this prospective study, TVS and TAS were compared in 90 women with placenta previa and the os-placental distance was compared with mode of delivery. Women with antepartum hemorrhage (APH) attributed to placenta previa, or placenta previa observed during routine sonography, were included. Women with severe bleeding, abruptio and indeterminate APH were excluded. All underwent TAS with partially full bladder followed by TVS after voiding (3.5, 5-7.5 MHz, ATL1500). Placental location (covering os, marginal or low-lying) and os-placental distance were noted. At delivery, this distance was assessed by digital examination or per the operative findings. As it-is not possible to measure the exact distance during a cesarean section, the surgeon's assessment was accepted. The women were classified into 4 groups: I (placenta covering os or <2.0 cm from os); II (2.1-3.5 cm from os); IN (>3.5 cm from os); and IV (sub-optimal view). Scans were repeated every 2 weeksd the last scan was considered for analysis.