Related Experiment Videos
Are all growth-restricted newborns created equal(ly)?
1Department of Epidemiology and Biostatistics, McGill University Faculty of Medicine, Royal Victoria Hospital, Montreal, Canada.
Pediatrics
|March 2, 1999
Summary
Pathologic factors like hypertension and smoking increase the risk of severe fetal growth restriction. These determinants, particularly pregnancy-induced hypertension, appear to act earlier in pregnancy, impacting preterm births more significantly.
Area of Science:
- Obstetrics and Gynecology
- Perinatology
- Neonatology
Background:
- Previous studies on intrauterine growth restriction (IUGR) used a single definition.
- Understanding the varied etiologies of IUGR is crucial for targeted interventions.
Purpose of the Study:
- To evaluate the differential impact of known risk factors on mild versus severe fetal growth restriction.
- To assess how these determinants influence preterm versus term IUGR.
Main Methods:
- A hospital-based cohort study of 65,280 singleton infants born between 1978 and 1996.
- Multiple logistic regression was used to compare adjusted odds ratios for mild and severe IUGR.
- Factors controlled for included maternal age, education, marital status, and prepregnancy BMI.
Main Results:
- Pathologic determinants like severe pregnancy-induced hypertension (PIH) and smoking were more strongly associated with severe IUGR than mild IUGR.
- Severe PIH showed a disproportionately larger effect on preterm IUGR compared to term IUGR.
- Maternal prepregnancy overweight and obesity had a protective effect against mild IUGR.
Conclusions:
- Pathologic factors, including PIH and smoking, contribute to more severe fetal growth restriction.
- Severe PIH appears to be a significant determinant of IUGR occurring before 37 weeks gestation.
- Fetal growth restriction is not a uniform condition; its severity and timing are influenced by specific etiologic factors.