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Abnormal heart rate characteristics are associated with abnormal neuroimaging and outcomes in extremely low birth

K D Fairchild1, R A Sinkin1, F Davalian1

  • 1Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, VA, USA.

Journal of Perinatology : Official Journal of the California Perinatal Association
|February 22, 2014
PubMed

Insights

A continuously monitored heart rate characteristics (HRC) index can predict brain injury in extremely low birth weight (ELBW) infants. Higher HRC index values correlate with abnormal brain imaging and adverse neurodevelopmental outcomes.

Area of Science:

  • Neonatal neurology
  • Pediatric cardiology
  • Neurodevelopmental pediatrics

Background:

  • Brain injury in preterm infants can cause central nervous system dysfunction, indicated by abnormal heart rate characteristics (HRC).
  • Reduced heart rate variability and decelerations are key HRC indicators.
  • Early identification of brain injury risk in extremely low birth weight (ELBW) infants is crucial for timely intervention.

Purpose of the Study:

  • To investigate the correlation between a continuously monitored HRC index and neuroimaging findings in ELBW infants.
  • To determine if the HRC index predicts adverse neurodevelopmental outcomes in ELBW infants.

Main Methods:

  • Analysis of the average HRC index within 28 days (aHRC28) in 384 ELBW infants.
  • Correlation of aHRC28 with head ultrasound (HUS), brain MRI, and Bayley neurodevelopmental testing at 1 year.
  • Statistical adjustment for gestational age, birth weight, and septicemia.

Main Results:

  • Higher aHRC28 was significantly associated with severe HUS abnormalities (Grade III-IV intraventricular hemorrhage or cystic periventricular leukomalacia).
  • Elevated aHRC28 correlated with white matter damage on MRI and increased odds of death or low Bayley scores.
  • Each one-point increase in aHRC28 raised the odds of death or a Bayley score <70 by 2.45.

Conclusions:

  • A continuously monitored HRC index is an objective, noninvasive tool for assessing brain injury risk in ELBW infants.
  • The HRC index effectively predicts abnormal brain imaging and adverse neurologic outcomes.
  • This metric can aid in early detection and management of neurological complications in ELBW infants.
Abstract

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