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No transabdominal scan until 18 weeks in obese women.(Fetal Heart Assessment)

OB GYN News

| August 01, 2003 | Johnson, Kate | COPYRIGHT 2003 International Medical News Group. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

MONTREAL -- Physicians should not attempt transabdominal ultrasonographic visualization of the fetal heart before 18 weeks in obese women but should consider an earlier transvaginal scan, Dr. Israel Hendler recommended.

"Patients usually get a scan between 16 and 18 weeks, but in obese patients you cannot see the fetal cardiac anatomy well at this time," he said, explaining that the fetal heart is too small and the maternal fat layer is too thick for good sonographic evaluation.

The ability to visualize the fetal heart is particularly important in obese patients, because studies have suggested that maternal obesity carries an odds ratio of between 2.0 and 6.5 for fetal cardiac anomalies, compared with the risk in normal-weight women, he said at a meeting sponsored by the World Federation for Ultrasound in Medicine and Biology

When maternal body mass index (BMI) goes above the 90th percentile, there is a 14.5% reduction in the quality of fetal visualization, according to one ...

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