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[Heart rhythm variability of healthy newborns with congenital heart defects]

W Wnuk1

  • 1II Kliniki Chorób Dzieci Katedry Chorób Dzieci Pomorskiej Akademii Medycznej w Szczecinie.

Annales Academiae Medicae Stetinensis
|November 20, 2001
PubMed

Insights

Premature birth significantly impacts autonomic nervous system maturation, leading to lower heart rate variability in preterm newborns compared to full-term infants. Congenital heart defects also alter autonomic nervous system activity patterns.

Area of Science:

  • Neonatal physiology
  • Cardiovascular system development
  • Autonomic nervous system maturation

Background:

  • Short-term heart rate changes, known as heart rate variability (HRV), are crucial indicators of cardiovascular system homeostasis.
  • The autonomic nervous system (ANS) plays a vital role in regulating heart rate and overall cardiovascular function.
  • Understanding ANS maturation in newborns is essential for assessing health and development.

Purpose of the Study:

  • To investigate the influence of premature birth on the maturation of the autonomic nervous system in newborns.
  • To compare heart rate variability patterns between preterm newborns, full-term newborns, and newborns with congenital heart defects.
  • To establish the relationship between gestational age and heart rate variability in early life.

Main Methods:

  • Heart rate variability was assessed in 12 preterm newborns, 88 full-term newborns, and 14 newborns with congenital heart defects.
  • Continuous electrocardiogram (ECG) recordings of 4-hour duration were analyzed.
  • Both spectral-domain and time-domain analyses of interbeat intervals were employed to evaluate HRV parameters.

Main Results:

  • Preterm newborns exhibited significantly lower time-domain HRV indices (SDNN, SDANN-i) compared to full-term newborns (p < 0.05).
  • Spectral-domain HRV indices (ULF, VLF, LF) were also significantly reduced in preterm infants relative to their full-term counterparts.
  • Newborns with congenital heart defects displayed distinct autonomic nervous system activity patterns compared to the other groups.

Conclusions:

  • Gestational age significantly influences the development and function of the autonomic nervous system, as reflected in heart rate variability.
  • Preterm birth is associated with delayed maturation of the autonomic nervous system.
  • Congenital heart defects introduce unique alterations in autonomic nervous system regulation in newborns.

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