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Maturation of cardiac control in full-term and preterm infants during sleep
Insights
Preterm infants have a lower average pulse interval and less variation than full-term infants during sleep in their first year. These cardiac differences are influenced by both post-birth and conception ages.
Area of Science:
- Neonatal physiology
- Cardiovascular development
- Infant sleep studies
Background:
- Heart rate regulation in infants is complex and changes rapidly after birth.
- Understanding developmental trajectories of cardiac function is crucial for identifying potential health issues.
- Previous research suggests differences in autonomic control between preterm and full-term infants.
Purpose of the Study:
- To investigate the developmental changes in cardiac rate control in preterm and full-term infants.
- To compare pulse interval and its variations between preterm and full-term infants during sleep.
- To determine the influence of postnatal and post-conceptional age on cardiac development.
Main Methods:
- Electrocardiogram (ECG) and respiration were recorded from 13 full-term and 8 preterm infants.
- Data were collected at 2-5 week intervals during sleep at home within the first year of life.
- Average pulse interval and respiratory-related variations were analyzed in relation to infant age.
Main Results:
- The minimum average pulse interval occurred between 4 and 10 weeks postnatal age for both groups.
- Preterm infants exhibited a significantly smaller minimum average pulse interval during quiet sleep (409 msec) compared to full-term infants (445 msec).
- Lower average pulse interval and reduced variability in preterm infants persisted until 7 months postnatal age, irrespective of post-conceptional age.
Conclusions:
- Cardiac rate control development is influenced by both postnatal and post-conceptional age.
- Post-conceptional age at birth establishes the baseline pulse interval level.
- Postnatal development further modifies cardiac control, with distinct patterns observed in preterm infants.
Abstract:
ECG and respiration were recorded from 13 full-term and 8 preterm infants at 2-5 week intervals during sleep at home in the first year of life. Average pulse interval in both quiet and active sleep was minimum at postnatal ages between 4 and 10 weeks, with the minimum during quiet sleep being significantly smaller for preterm (409 +/- 22 (SE) msec) than for full-term (445 +/- 9 msec) infants. The minimum average pulse interval of preterm infants was smaller than the pulse interval of full-term infants at any post-conceptional age, and a smaller average pulse interval and smaller variations in pulse interval in preterm infants during quiet sleep persisted until a postnatal age of 7 months. The pulse interval variations attributable to respiration varied substantially with age. The results indicate that developmental changes in cardiac rate control are functions of both postnatal and post-conceptional age, with the post-conceptional age at birth setting the mean level of pulse interval, a level which is then altered by development linked to postnatal age.