Related Experiment Videos
The influence of abnormal pregnancies on fluorescence polarization of amniotic fluid lipids
G Barkai1, B Reichman, M Modan
1Department of Obstetrics and Gynecology, Chaim Sheba Medical Center, Tel-Hashomer, Israel.
Insights
Fluorescence polarization of amniotic fluid accurately measures fetal lung maturity. Premature rupture of membranes significantly impacts this measure, unlike other abnormal pregnancy conditions.
Area of Science:
- Obstetrics and Gynecology
- Neonatal Medicine
- Clinical Chemistry
Background:
- Fetal lung maturity assessment is crucial for optimizing delivery timing in high-risk pregnancies.
- Fluorescence polarization of amniotic fluid is a validated method for determining fetal lung maturity.
Purpose of the Study:
- To evaluate the impact of various abnormal pregnancy conditions on amniotic fluid fluorescence polarization.
- To correlate fluorescence polarization values with gestational age and specific clinical groups.
Main Methods:
- Amniotic fluid samples (n=518) were collected via amniocentesis.
- Fluorescence polarization was measured and analyzed across different gestational age groups and clinical conditions.
- Statistical comparisons were made between groups to assess significant differences.
Main Results:
- A progressive increase in mature fluorescence polarization values was observed with advancing gestational age, reaching 100% by 39-40 weeks.
- Premature rupture of membranes showed a significantly higher proportion of mature values (84.6%) compared to other conditions in the 31-36 week group.
- Mean fluorescence polarization was significantly lower in premature rupture of membranes compared to other studied conditions.
Conclusions:
- Fluorescence polarization of amniotic fluid is a reliable indicator of fetal lung maturity across gestational ages.
- Premature rupture of membranes is a significant factor influencing amniotic fluid fluorescence polarization, potentially indicating accelerated lung maturation.
- Most other abnormal pregnancy conditions, including hypertension and diabetes, did not significantly alter fluorescence polarization results.
Abstract:
The fluorescence polarization of amniotic fluid, a measure of fetal lung maturity, was determined in 518 amniotic fluid samples obtained by amniocentesis. The subjects were divided into seven clinical groups: premature contractions, premature rupture of the membranes, pregnancy-induced hypertension, diabetes, intrauterine growth retardation, vaginal bleeding, and "other" for gestational-age groups of 30 weeks or less, 31-36 weeks, and 37 or more weeks. The proportion of mature values (fluorescence polarization 0.285 or lower) increased progressively from 12.5% at 27-28 weeks to 100% at 39-40 weeks. In the 31-36-week gestation group, the proportion of mature values in subjects with premature rupture of the membranes (84.6%) was significantly higher than in those with premature contractions (60%), severe pregnancy-induced hypertension (50%), mild pregnancy-induced hypertension (55.2%), diabetes class A (50%), insulin-dependent diabetes (60%), and other (63.5%). The mean +/- SD fluorescence polarization value was significantly lower in premature rupture of the membranes (0.256 +/- 0.030) than in premature contractions (0.274 +/- 0.032), mild and severe pregnancy-induced hypertension (0.280 +/- 0.027 and 0.280 +/- 0.035, respectively), and class A and insulin-dependent diabetes (0.285 +/- 0.018 and 0.277 +/- 0.030, respectively). The severity of pregnancy-induced hypertension and diabetes did not appear to influence either the fluorescence polarization value or the proportion of mature results. With the exception of a marked influence of premature rupture of the membranes, abnormal pregnancy conditions did not appear to have a significant effect on fluorescence polarization of amniotic fluid.