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Related Experiment Videos

Episodic bradycardia in preterm infants.

C J Upton1, A D Milner, G M Stokes

  • 1Department of Neonatal Medicine and Surgery, City Hospital, Nottingham.

Archives of Disease in Childhood
|July 1, 1992
PubMed
Summary

Bradycardia in preterm infants is often triggered when breathing resumes against a closed airway after apnea. Hypoxemia can intensify this reflex, impacting infant cardiorespiratory events.

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Area of Science:

  • Neonatal Physiology
  • Cardiorespiratory Regulation
  • Pediatric Pulmonology

Background:

  • Preterm infants, particularly those born at 32 weeks' gestation or less, are susceptible to cardiorespiratory events like bradycardia.
  • Apnea of prematurity is a common concern, often preceding or coinciding with other physiological disturbances.

Purpose of the Study:

  • To investigate the specific factors that precipitate bradycardia in preterm infants.
  • To elucidate the relationship between apnea, upper airway function, and the occurrence of bradycardia.

Main Methods:

  • Studied 27 preterm infants (≤32 weeks gestation) across 89 occasions.
  • Utilized polygraphic recordings for electrocardiography, oxygen saturation, and respiratory effort.
  • Measured upper airway flow using a mask and pressure transducer during apneic episodes.

Main Results:

  • Bradycardia onset positively correlated with apnea duration.
  • Airway closure was observed in 88% of apneas associated with bradycardia, significantly higher than in apneas without bradycardia (64%).
  • Bradycardia frequently occurred as respiratory effort resumed post-apnea.

Conclusions:

  • Bradycardia in preterm infants is suggested to be a reflex response to resuming respiration against a closed upper airway.
  • This reflex appears to be potentiated by hypoxemia, highlighting the interplay between airway obstruction and oxygen levels.

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