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Carbon monoxide diffusing capacity in newborn infants

A N Krauss, D B Klain, P A Auld

    Pediatric Research
    |September 1, 1976
    PubMed
    Summary
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    Pulmonary diffusing capacity for carbon monoxide (DLCO) in healthy newborns showed a strong link with lung volume but a weaker one with arterial oxygen tension. These findings in infants mirror adult observations.

    Area of Science:

    • Neonatal Physiology
    • Pulmonary Medicine
    • Respiratory System Development

    Background:

    • Arterial oxygen tension is a critical indicator of respiratory health in newborns.
    • Pulmonary diffusing capacity, specifically for carbon monoxide (DLCO), is a measure of gas exchange efficiency in the lungs.
    • Understanding factors influencing gas exchange in neonates is crucial for assessing respiratory function.

    Purpose of the Study:

    • To investigate the relationship between pulmonary diffusing capacity for carbon monoxide (DLCO) and arterial oxygen tension in healthy newborn infants.
    • To determine if DLCO correlates with lung volume in this population.
    • To compare DLCO per unit lung volume across different age groups, including premature infants, full-term infants, and adults.

    Main Methods:

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  • Pulmonary diffusing capacity for carbon monoxide (DLCO) was measured in 21 healthy infants.
  • Infant weights ranged from 765 to 4,720 g.
  • Statistical correlations were calculated between DLCO, lung volume, and arterial oxygen tension.

    • Main Results:

    • DLCO correlated well with lung volume in infants without respiratory distress (r=0.76, P < 0.001).
    • A weaker correlation was observed between DLCO and arterial oxygen tension (r = 0.39, P < 0.01).
    • DLCO per unit lung volume was comparable between healthy premature infants, full-term infants, and normal adults.

    Conclusions:

    • DLCO in healthy newborns is strongly associated with lung volume.
    • The correlation between DLCO and arterial oxygen tension in infants is less pronounced, similar to adult findings.
    • A wide range of normal DLCO values exists in resting infants, and it does not reliably predict arterial oxygen tension.