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Amniotic fluid volume called 'weak' predictor.(Obstetrics)
WASHINGTON -- Ultrasound estimations of amniotic fluid volume do not correlate with perinatal outcomes, and low volume is a "particularly weak" predictor of fetal morbidity or death, William J. Ott, M.D., reported.
"Alterations in amniotic fluid volume, especially low volume, classically have been considered an indication of fetal compromise. But recent studies have questioned the predictive value of amniotic fluid estimates," he said at the annual meeting of the Central Association of Obstetricians and Gynecologists.
Dr. Ott, director of research for the department of obstetrics and gynecology at St. John's Mercy Medical Center, St. Louis, said he undertook a study of the issue "because I saw an alarming trend of completely normal patients, whose only problem was 'decreased amniotic fluid,' being induced at 37-38 weeks and winding up with unnecessary cesarean sections."
In the retrospective study, the records of all women with singleton pregnancies who underwent ultrasound estimation of amniotic fluid volume over a 6-year period were reviewed. The records were divided into three groups: the single ultrasound measurements made in 1,153 low-risk pregnancies, the multiple measurements (more than 14,700) made in 4,337 high-risk pregnancies, and the measurements made in another 454 high-risk pregnancies within 48 hours of delivery.
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