Antenatal Development Evaluated Prospectively

Study Overview
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Brief Summary
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Fetal growth abnormalities is one of the most common problems faced in modern obstetrics. The association between low birth weight and perinatal death as well as severe morbidity is well known. Since fetal weight cannot be measured directly, obstetricians use estimates of fetal weight obtained by utilizing various ultrasonographic measurements to diagnose growth abnormalities. Currently in clinical practice, the majority of fetal ultrasound centers employ population-based fetal growth curves that have been previously published and updated to estimate fetal weight percentiles. Up to 70% of neonates found to be below the 10% percentile for estimated fetal weight in population-based growth curves are actually constitutionally small; that is a neonate deemed small based on standardized growth curves but in reality have reached its appropriate growth potential in relation to its genetic predisposition. An equally difficult clinical scenario is fetal macrosomia. A recent meta-analysis revealed that the sensitivity and specificity of ultrasound detection of fetal macrosomia ranges from 15-79%. When compared with neonates with normal birth weight, the odds ratio of emergency cesarean delivery and shoulder dystocia are increased significantly. Various ultrasound parameters have been tested in an effort to detect both fetal compromise prior to the development of permanent damage and allow differentiation between true fetal growth abnormalities and normal growth potential. Recent reports have introduced the concept of customized fetal growth curve which uses physiological variables to report an adjusted fetal growth assessment. To date, the use of customized fetal growth curves has not been evaluated prospectively. Furthermore, this strategy has not been compared to standard population-based fetal growth curves currently used in clinical practice to determine which would be the most ideal for use in clinical practice. The primary research question is: are customized fetal growth curves more accurate than population-based fetal growth curves at predicting abnormalities in fetal growth, defined as small-for-gestational age or large-for-gestational age at birth in newborns of high-risk pregnancies? Randomly, participants will be assigned to either having fetal growth reported by customized or population bases growth curves.

Official Title
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Customized Versus Population Fetal Growth Curves: A Randomized Controlled Pilot Trial

Conditions
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Retardation, Fetal Growth, Macrosomia, Fetal

Intervention / Treatment
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* Other: Customized fetal growth curves


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Gestational age greater than or equal to 24 weeks gestation. Maternal age over 18 years, Prior normal fetal anatomy ultrasound done at main ultrasound unit Exclusion Criteria: 1. Pregnancies carrying higher order multiples (triplets, quadruplets, etc).

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| No Intervention: Population-based<br>Participants will be randomly assigned to population-based fetal growth curves | |
| Active Comparator: Customized-based<br>Participants will be randomly assigned to customized-based fetal growth curves (intervention) | Other: Customized fetal growth curves<br>* Fetal weight will be plotted against growth curves specific for height, weight, parity and ethnicity<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Detection of fetal growth abnormalities | Birth weight will be used to confirm prenatal diagnosis of fetal growth abnormality | Participants will be followed from 24 weeks gestation to 2 weeks postpartum | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Fetal growth restriction, macrosomia