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Related Experiment Videos

Hypercapnia increases expiratory braking in preterm infants

E C Eichenwald1, R A Ungarelli, A R Stark

  • 1Department of Pediatrics, Harvard Medical School, Boston, Massachusetts.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|December 1, 1993
PubMed
Summary

Premature infants use enhanced expiratory braking to maintain lung volume during hypercapnia. This breathing strategy may help infants with lung disease by improving gas exchange.

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Area of Science:

  • Neonatal Physiology
  • Respiratory Control

Background:

  • Newborn infants maintain elevated end-expiratory lung volume via diaphragm and laryngeal braking.
  • The impact of hypercapnia on this breathing strategy in premature infants is not well understood.

Purpose of the Study:

  • To investigate the effects of hypercapnia on respiratory muscle activity and ventilatory response in premature infants.
  • To determine if CO2 breathing alters the mechanisms controlling end-expiratory lung volume.

Main Methods:

  • Studied eight premature infants (33-34 wk gestational age) in early postnatal life.
  • Recorded tidal volume, airflow, and electromyograms (EMG) of the diaphragm and posterior cricoarytenoid (PCA) muscle.
  • Assessed breathing patterns in room air and during 2% CO2 inhalation.

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Main Results:

  • Hypercapnia increased tidal volume without altering inspiratory duration.
  • Expiratory duration significantly increased with CO2, indicating enhanced expiratory braking.
  • Post-inspiratory diaphragm EMG activity and peak inspiratory EMG activity of diaphragm and PCA increased with CO2.

Conclusions:

  • Premature infants enhance expiratory braking mechanisms during hypercapnia.
  • This augmented breathing strategy may be crucial for maintaining gas exchange in infants with respiratory conditions.