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Fetal macrosomia: etiologic factors
1St. Luke's-Roosevelt Hospital Center, Department of Obstetrics and Gynecology, New York, New York 10019, USA.
Insights
Fetal growth results from genetics and nutrient availability, primarily glucose. Focus should be on identifying and preventing accelerated fetal overgrowth to avoid adverse perinatal outcomes.
Area of Science:
- Perinatal medicine
- Fetal development
- Maternal-fetal interface
Background:
- Fetal growth is a complex process influenced by genetic factors and nutrient supply.
- Limitations in substrate availability, including amino acids, fatty acids, and glucose, constrain fetal growth.
- Most large infants are constitutionally large and do not experience adverse outcomes.
Purpose of the Study:
- To differentiate between constitutional and pathologic fetal overgrowth.
- To highlight the importance of identifying fetuses with accelerated growth.
- To emphasize primary prevention strategies for abnormal fetal overgrowth.
Main Methods:
- Review of existing literature on fetal growth determinants.
- Analysis of factors contributing to substrate availability.
- Discussion of diagnostic and management approaches for fetal overgrowth.
Main Results:
- Fetal growth is a balance between genetic potential and environmental constraints.
- Accelerated fetal overgrowth represents a pathologic condition requiring intervention.
- Constitutional large fetal size generally does not lead to adverse perinatal outcomes.
Conclusions:
- Management efforts should target pathologically overgrown fetuses.
- Primary prevention through maternal and fetal management is crucial.
- Distinguishing between normal and abnormal fetal growth is key for optimal perinatal care.
Abstract:
Fetal growth can be considered the outcome of an interaction between the genetic cause of growth and constraints provided by limitations on substrate availability (selected amino acids, free fatty acids, and mainly glucose). It should be noted that the majority of large infants are constitutionally large and do not require special intervention, which will result in adverse perinatal outcome. Efforts should be directed to the accelerated (pathologic) overgrown fetus and to methods of primary prevention of this abnormality by appropriate management approaches for the mother and fetus.