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Long-term variability of heart rate increases with successful closure of patent ductus arteriosus in preterm infants

V Prietsch1, R Maier, L Schmitz

  • 1Department of Neonatology, Universitätsklinikum Rudolf, Children's Hospital, Berlin, FRG.

Biology of the Neonate
|January 1, 1992
PubMed

Insights

Long-term heart rate variability (LTV) may monitor treatment effectiveness in preterm infants. Lower LTV in patent ductus arteriosus (PDA) infants suggests brain stem oxygenation changes, with indomethacin improving LTV.

Area of Science:

  • Neonatal physiology
  • Cardiovascular research
  • Medical technology

Background:

  • Patent ductus arteriosus (PDA) is common in preterm infants and can affect cardiorespiratory function.
  • Assessing treatment efficacy for PDA and congenital heart defects is crucial for improving outcomes.
  • Continuous monitoring of physiological parameters can provide valuable insights into infant health status.

Purpose of the Study:

  • To investigate the relationship between long-term heart rate variability (LTV) and treatment responses in preterm infants.
  • To determine if LTV can serve as a non-invasive marker for brain stem oxygenation during medical interventions.
  • To evaluate the utility of LTV in monitoring the effectiveness of indomethacin for PDA and prostaglandin E1 for cyanotic heart malformations.

Main Methods:

  • Continuous heart rate variability (LTV) was measured using a microprocessor in three groups of infants: preterm infants with PDA undergoing indomethacin treatment (n=25), preterm infants without PDA (controls, n=24), and neonates with cyanotic heart malformation treated with prostaglandin E1 (n=10).
  • LTV was compared between groups and changes in LTV were analyzed in relation to treatment outcomes and respiratory status.
  • Statistical significance was assessed using appropriate methods (p-values provided).

Main Results:

  • Infants with patent ductus arteriosus (PDA) exhibited lower LTV compared to control infants.
  • Following indomethacin treatment for PDA, LTV significantly increased in infants with improved ventilation (from 1.5 to 3.2; p<0.01) and showed a less marked increase in those with unchanged respiratory failure (from 1.8 to 2.5; p<0.05).
  • LTV remained stable in infants who deteriorated and increased in 90% of neonates treated with prostaglandin E1.

Conclusions:

  • Long-term heart rate variability (LTV) appears to correlate with brain stem oxygenation in infants.
  • LTV may be a valuable, non-invasive tool for monitoring the effectiveness of treatments such as indomethacin for PDA and prostaglandin E1 for congenital heart defects.
  • Further research can validate LTV as a clinical monitoring parameter in neonatal care.

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