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First-trimester US parameters of failed pregnancy
S E Rowling1, B G Coleman, J E Langer
1Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia 19104, USA.
Radiology
|April 1, 1997
Summary
Established ultrasound parameters for predicting first-trimester pregnancy outcomes may misdiagnose nonviability. Close follow-up is crucial for borderline abnormal findings in early pregnancy failure prediction.
Area of Science:
- Obstetrics and Gynecology
- Medical Imaging
- Reproductive Medicine
Background:
- Ultrasound (US) parameters are used to predict first-trimester pregnancy outcomes.
- Reliability of these established parameters in large, unselected populations needs evaluation.
Purpose of the Study:
- To assess the accuracy of specific ultrasound criteria in predicting early pregnancy failure.
- To determine if established parameters reliably predict pregnancy outcomes in a diverse patient group.
Main Methods:
- Retrospective review of 2,655 first-trimester ultrasound scans from 2,285 patients.
- Analysis of parameters: yolk sac presence with 8mm mean sac diameter, embryo presence with 16mm mean sac diameter, and oligohydramnios (sac diameter-crown-rump length difference <5mm).
Main Results:
- 30% of cases with an 8mm mean sac diameter and no yolk sac showed live embryos; 22% had normal outcomes.
- 8% of cases with a 16mm mean sac diameter and no embryo showed live embryos; outcomes varied.
- Early oligohydramnios occurred in 0.74% of patients, with 35% having normal outcomes or delivery.
Conclusions:
- Established ultrasound parameters may lead to misdiagnosis of nonviability or poor prognosis in unselected populations.
- Close patient follow-up is essential for borderline abnormal ultrasound findings in early pregnancy.
- Re-evaluation of established criteria is needed for accurate prediction of pregnancy outcomes.