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Frequency of fetal anomalies in sonographically detected polyhydramnios
N Damato1, R A Filly, R B Goldstein
1Department of Radiology, University of California, San Francisco 94143-0628.
Insights
Severe polyhydramnios in pregnancy significantly increases the risk of fetal anomalies. Sonography is crucial for detecting these abnormalities, with higher pocket depths correlating to greater anomaly probability.
Area of Science:
- Perinatology
- Fetal Medicine
- Diagnostic Sonography
Background:
- Polyhydramnios, characterized by excessive amniotic fluid, is a condition associated with increased risk of adverse pregnancy outcomes.
- The depth of the amniotic fluid pocket is a key indicator in assessing the severity of polyhydramnios.
Purpose of the Study:
- To investigate the correlation between amniotic fluid pocket depth and the incidence of fetal anomalies in polyhydramniotic pregnancies.
- To determine the spectrum of anomalies associated with polyhydramnios and evaluate the diagnostic accuracy of sonography.
Main Methods:
- Retrospective analysis of 105 pregnancies diagnosed with polyhydramnios (amniotic fluid pocket depth > 8.0 cm).
- Categorization of patients based on pocket depth severity.
- Sonographic evaluation for fetal anomalies.
Main Results:
- A direct correlation was observed between amniotic fluid pocket depth and the likelihood of detecting fetal anomalies.
- Fetuses in the lowest severity group (8-9.5 cm) had a 50% anomaly rate, while those in the highest group (>16.0 cm) had an 88% risk.
- Overall, 63% of polyhydramniotic pregnancies exhibited anomalies, with sonography detecting all confirmed cases.
- Monochorionic twinning anomalies and gastrointestinal anomalies were most frequent.
Conclusions:
- Sonographic assessment of amniotic fluid pocket depth is vital for predicting fetal anomaly risk in polyhydramnios.
- The severity of polyhydramnios directly impacts the probability and spectrum of associated fetal abnormalities.
Abstract:
One hundred and five patients who met the criterion of having an amniotic fluid pocket depth greater than 8.0 cm were categorized as polyhydramniotic. Of these cases, 82% were singleton pregnancies and 18% were twin pregnancies. The degree of polyhydramnios correlated directly with the probability that an anomaly would be detected. For the lowest rank group (pocket depth of 8 to 9.5 cm), 50% of fetuses manifested an anomaly, whereas the highest rank (16.0 cm or greater pocket depth) carried an 88% risk for an anomaly. Overall, 63% of pregnancies with polyhydramnios revealed anomalies. Sonography found all to be anomalous. There were three false diagnoses of potential anomalies. Monochorionic anomalies of twinning (twin transfusion syndrome and acardiac twin) and gastrointestinal anomalies among singletons were the most commonly seen abnormalities. However, a broad spectrum of anomalies was represented in the study group. Only five diabetic mothers were seen in our study cohort, and in each of them the pregnancy was further complicated by an associated fetal anomaly.