Macrosomia: a new formula for optimized fetal weight estimation.

Autor: Hart NC; Department of Obstetrics and Gynecology, Diakonische Dienste Henriettenstiftung, Hannover, Germany., Hilbert A, Meurer B, Schrauder M, Schmid M, Siemer J, Voigt M, Schild RL
Jazyk: angličtina
Zdroj: Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology [Ultrasound Obstet Gynecol] 2010 Jan; Vol. 35 (1), pp. 42-7.
DOI: 10.1002/uog.7493
Abstrakt: Objectives: To develop and test a specific formula for estimating weight in the macrosomic fetus.
Methods: Ultrasound estimations of fetal weight were carried out within 1 week of delivery in 424 singleton fetuses with a birth weight of > or = 4000 g. Exclusion criteria were multiple pregnancy, intrauterine death and major structural or chromosomal anomalies. Stepwise regression modeling was used to derive a prediction formula with birth weight as the dependent variable and maternal booking weight and fetal biometric measurements as independent parameters. After a new formula for estimated fetal weight (EFW) had been developed in a formula-finding group (n = 284), it was compared with commonly used weight equations (evaluation group, n = 140).
Results: The new formula (log(e)EFW = 7.6377445039 + 0.0002951035 x maternal weight + 0.0003949464 x head circumference + 0.0005241529 x abdominal circumference + 0.0048698624 x femur length) proved to be superior to established equations, with the smallest mean error (mean +/- SD, -10 +/- 202 g), the smallest mean percentage error (mean +/- SD, -0.03 +/- 4.6%) and the lowest mean absolute percentage error (3.69 (range, 0.05-13.57)%) when studied in the evaluation group. With the new formula, 77.9% of estimates fell within +/- 5% of the actual weight at birth, 97.1% within +/- 10%, and 100% within +/- 15% and +/- 20%.
Conclusions: The new formula allows better weight estimation in the macrosomic fetus.
Databáze: MEDLINE
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