Maturation of autonomic control in preterm infants
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Autonomic control in infants is affected by prematurity and illness. Respiratory distress syndrome (RDS) and preterm infants show altered heart rate patterns compared to healthy term infants.
Area of Science:
- Neonatal physiology
- Autonomic nervous system development
- Pediatric cardiology
Background:
- Autonomic control is crucial for infant development.
- Prematurity and postnatal illness can impact physiological regulation.
- Understanding these effects is vital for neonatal care.
Purpose of the Study:
- To investigate autonomic control development in relation to postnatal illness.
- To compare autonomic activity in healthy term, healthy preterm, and recovered preterm infants.
- To assess the influence of conceptional age on autonomic measures.
Main Methods:
- Electrocardiogram (EKG) recordings were taken from infants at 40 weeks conceptional age (C.A.) and 3 months C.A.
- Infants were in a quiet, alert state during 3-minute resting EKG.
- Measures of resting heart period and heart period variability were analyzed.
Main Results:
- Preterm infants (both healthy and recovered from respiratory distress syndrome (RDS)) had shorter heart periods than healthy term infants at 40 weeks C.A.
- RDS preterm infants exhibited reduced overall and short-term heart period variability compared to healthy infants.
- Autonomic activity patterns were influenced by both prematurity and postnatal illness.
Conclusions:
- Autonomic activity in early infancy is significantly affected by prematurity and postnatal illness.
- These findings highlight differences in autonomic development between term and preterm infants.
- The study provides insights into the long-term physiological impact of neonatal conditions.
Abstract:
In order to investigate the development of autonomic control and its relation to postnatal illness, healthy term, healthy preterm, and preterm infants who had recovered from respiratory distress syndrome (RDS) were seen around the expected date of their birth, 40 weeks conceptional age (C.A.), and again at 3 months conceptional age. Three minutes of resting EKG were collected at each age point while the infant was in a quiet, alert state. Measures of resting heart period and heart period variability were derived. Results revealed the influence of maturity and illness on autonomic activity. RDS and healthy preterm infants, at 40 weeks C.A. exhibited a pattern of small heart period compared to healthy term. RDS preterm infants at 40 weeks C.A. exhibited less overall variability than either healthy group and across age displayed less short-term variability than the healthy infants. The data suggest that autonomic activity during the early months of life may be affected by both prematurity and postnatal illness. The significance of these data in understanding term/preterm differences in the neonatal period is discussed.