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The variables affecting nuchal skin-fold thickness in mid-trimester
1Department of Obstetrics and Gynecology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
Prenatal Diagnosis
|January 21, 2003
Summary
This study identifies gestational age, cephalic index, fetal presentation, and nuchal cord presence as key factors influencing nuchal skin-fold thickness measurements in fetuses. Regression equations are provided to estimate nuchal skin-fold thickness, aiding in Down syndrome screening.
Area of Science:
- Prenatal diagnostics
- Fetal biometry
- Medical imaging
Background:
- Nuchal skin-fold thickness (NT) is a crucial parameter in prenatal screening.
- Accurate NT measurement is vital for detecting fetal abnormalities, including Down syndrome.
- Factors influencing NT require further elucidation for improved diagnostic accuracy.
Purpose of the Study:
- To identify variables affecting fetal nuchal skin-fold thickness (NT).
- To develop regression equations for predicting NT based on identified variables.
- To enhance the accuracy of prenatal screening for fetal abnormalities.
Main Methods:
- Prospective data collection on 548 normal singleton fetuses (16-24 weeks gestation).
- Variables analyzed: gestational age (GA), cephalic index (CI), presentation (Pr), and nuchal cord (NC).
- Multiple regression analysis used to determine correlations and formulate predictive equations.
Main Results:
- Gestational age (GA) showed a positive correlation with NT.
- Cephalic index (CI) demonstrated a negative correlation with NT.
- Nuchal skin-fold thickness was greater in breech presentations and with the presence of a nuchal cord (NC).
Conclusions:
- This study presents the first comprehensive analysis correlating GA, CI, Pr, and NC with NT.
- Developed regression equations can estimate NT, potentially improving Down syndrome detection sensitivity and specificity.
- Refined NT assessment may reduce the need for invasive diagnostic procedures like amniocentesis.