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A persistent clinical problem: profile of the term infant with significant respiratory complications
A Fleischer1, A Anyaegbunam, D Guidetti
1Department of Obstetrics and Gynecology, Albert Einstein College of Medicine, Bronx, New York.
Insights
Meconium-stained amniotic fluid significantly increases respiratory complications in newborns, even with normal fetal heart rate and Apgar scores. Other risk factors include postdatism and intrauterine growth retardation.
Area of Science:
- Neonatal Medicine
- Perinatal Health
- Pediatric Respiratory Medicine
Background:
- Significant respiratory complications affect term infants.
- Identifying risk factors for neonatal respiratory issues is crucial for timely intervention.
Purpose of the Study:
- To investigate the association between specific antenatal and intrapartum factors and the development of respiratory complications in term infants.
- To quantify the risk conferred by meconium-stained amniotic fluid, postdatism, intrauterine growth retardation, fetal heart rate abnormalities, and low Apgar scores.
Main Methods:
- Retrospective cohort study comparing 72 term infants with respiratory complications to 11,428 controls.
- Analysis of incidence of postdatism, intrauterine growth retardation, meconium-stained amniotic fluid, fetal heart rate abnormalities, and Apgar scores.
Main Results:
- Infants with respiratory complications showed higher rates of postdatism (36% vs 7%), intrauterine growth retardation (33% vs 8%), meconium-stained amniotic fluid (90% vs 9%), fetal heart rate abnormalities (58% vs 7%), and low 5-minute Apgar scores (46% vs 1.4%).
- Meconium-stained amniotic fluid was associated with a 100-fold increased risk of respiratory complications, independent of intrapartum fetal heart rate and Apgar scores.
- Only 20% of infants with low 5-minute Apgar scores developed respiratory complications, with the remainder showing lower rates of other risk factors.
Conclusions:
- Meconium-stained amniotic fluid is a potent independent risk factor for neonatal respiratory complications.
- While postdatism, intrauterine growth retardation, and fetal heart rate abnormalities are associated with increased risk, meconium presence poses the most significant threat.
- Low Apgar scores are less predictive of subsequent respiratory complications than previously thought, suggesting other protective factors may be at play in some infants.
Abstract:
A group of 72 term infants with significant respiratory complications were compared with 11,428 term infants delivered during the same time period and without respiratory morbidity. Compared with controls, the study group had a higher incidence of postdatism (36 versus 7%), intrauterine growth retardation (33 versus 8%), meconium-stained amniotic fluid (AF) (90 versus 9%), fetal heart rate (FHR) abnormalities upon admission to labor and delivery (58 versus 7%), and low 5-minute Apgar scores (46 versus 1.4%). Even in the presence of normal intrapartum FHR and 5-minute Apgar scores, infants with meconium-stained AF had an incidence of respiratory complications 100 times higher than those with clear AF. Of infants with a low 5-minute Apgar score at birth, only 20% went on to develop respiratory complications. The remaining 80% had a significantly lower incidence of postdatism, intrauterine growth retardation, and meconium-stained AF.