Keywords
Instituto de Investigación Tecnológica (IIT), Estimación ecográfica; Peso fetal; Biometría fetal
Estimación ecográfica del peso fetal: ¿podemos mejorar nuestras predicciones?
Abstract
Objectivos:
a) Estudiar la validez de la estimación ecográfica del peso fetal y determinar qué fórmula permite mejores predicciones. B) Proponer una fórmula que se adapte mejor a nuestra población.
Material y métodos:
Estudio prospectivo en el que se incluyen 282 gestaciones únicas a término. Determinación del peso fetal mediante 17 fórmulas. Análisis de su validez mediante el error medio y el porcentaje de predicciones con un error menor del 10%.
Resultados:
Catorce fórmulas presentaron un error medio menor del 10%. Diez de ellas permiten más de un 65% de predicciones válidas, con un error inferior al 10%. Las que ofrecen mejores resultados son algunas de las propuestas por Hadlock y la de Aoki. La fórmula propuesta, usando 3 parámetros ecográficos, permite un 73,8% de predicciones válidas con un error inferior al 10% y un 87,9% con un error inferior al 15%.
Conclusiones:
La estimación por eco 2D tiene una validez limitada. La fórmula propuesta mejora las estimaciones en nuestra población.
Objective (a) To assess the validity of ultrasound estimation of fetal weight and to compare the accuracy of 17 sonographic formulae to predict fetal birth weight. (b) To propose a new formula that improves predictions in our population. Methods We performed a prospective study that included 282 pregnant women at term. Seventeen formulae were used to predict fetal weight. To assess the accuracy of the predictions, the mean error and the percentage of estimations with a mean error of less than 10% were used. Results Fourteen formulae provided a mean error lower than 10%. Ten of these formulae allowed estimations within ±10% of the actual birth weight in more that 65% of predictions. The most accurate formulae in predicting fetal weight were those of Hadlock and Aoki. With our formula, which employs three ultrasound parameters, 73.8% of estimations were valid with a mean error of 10% and 87.9% had an error of less than 15%. Conclusions The accuracy of fetal weight estimation by ultrasound is limited and may improve with the new formula adjusted to our population.
Objective (a) To assess the validity of ultrasound estimation of fetal weight and to compare the accuracy of 17 sonographic formulae to predict fetal birth weight. (b) To propose a new formula that improves predictions in our population. Methods We performed a prospective study that included 282 pregnant women at term. Seventeen formulae were used to predict fetal weight. To assess the accuracy of the predictions, the mean error and the percentage of estimations with a mean error of less than 10% were used. Results Fourteen formulae provided a mean error lower than 10%. Ten of these formulae allowed estimations within ±10% of the actual birth weight in more that 65% of predictions. The most accurate formulae in predicting fetal weight were those of Hadlock and Aoki. With our formula, which employs three ultrasound parameters, 73.8% of estimations were valid with a mean error of 10% and 87.9% had an error of less than 15%. Conclusions The accuracy of fetal weight estimation by ultrasound is limited and may improve with the new formula adjusted to our population.
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