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- W3147649098 abstract "Background The true risk of choronic villus sampling (CVS) is poorly defined. The objective of this study was to review the clinical outcome of transabdominal CVS performed in a university teaching unit, with an emphasis on the complication rate.Methods A comprehensive audit database was maintained for 1351 pregnant women, including 17 sets of twin pregnancies, who had a CVS. Details and outcome of all CVSs made in the unit between May 1996 and May 2004 were reviewed. All CVSs were performed by one of 5 operators using the identical techniques.Results All procedures were performed transabdominally. A total of 1355 CVSs were performed because there were 4 dichorionic twin pregnancies which required 2 punctures. The mean gestation at CVS was (11.8±0.7) weeks, and 97.3% of the procedures were performed between 11 and 13 completed weeks. The majority (96.2%) required only 1 puncture to achieve correct needle placement. The procedure failed to obtain an adequate sample in 4 subjects (0.30%). A total of 1351 chromosomal studies were requested and there was 1 case (0.07%) of culture failure. The results of chromosomal studies were available within 14 days in 36.7% of the cases and within 21 days in 94.0%. Overall, 77 chromosomal abnormalities (5.7%) and 5 cases of thalassemia major were detected. Pregnancy outcome was unknown in only 13 singleton subjects (0.96%). In the remaining 1355 fetuses, there were 76 pregnancy terminations (5.56%), 10 fetal losses with obvious obstetric causes (0.73%), and 21 potentially procedure-related fetal losses (1.54%). In the last group, the majority had one or more co-existing obstetric complications. The background fetal loss rate for pregnancies at similar gestational age in the unit was about 0.8%. Therefore, the procedure-related fetal loss rate was estimated to be at the maximum of 0.74%.Conclusions In experienced hands, first trimester transabdominal CVS is an accurate and safe invasive prenatal diagnostic procedure. It should be one of the treatment options available to pregnant" @default.
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- W3147649098 date "2005-01-01" @default.
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- W3147649098 title "Outcome of 1355 consecutive transabdominal chorionic villus samplings in 1351 patients" @default.
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