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Lung transfer for carbon monoxide during the first three years of life
Insights
Lung transfer for carbon monoxide (TLCO) increases linearly with infant growth parameters. Functional residual capacity (FRC) also grows with age and correlates with TLCO, indicating adaptive lung development.
Area of Science:
- Pediatric Pulmonology
- Respiratory Physiology
- Infant Lung Development
Background:
- Understanding lung function development in infants is crucial for assessing respiratory health.
- Previous research has established growth-related changes in lung volumes, but gas transfer adaptations require further elucidation.
Purpose of the Study:
- To quantify the relationship between lung transfer of carbon monoxide (TLCO) and anthropometric/age parameters in healthy infants.
- To examine the correlation between functional residual capacity (FRC) and TLCO during early childhood.
- To explore the link between these physiological measures and alveolar development.
Main Methods:
- Measured TLCO in 35 healthy infants using a non-invasive steady-state alveolar sampling technique.
- Assessed FRC in 29 infants via helium dilution.
- Analyzed linear correlations between TLCO, FRC, height, weight, body surface area, age, and alveolar number.
Main Results:
- TLCO demonstrated a significant linear increase with height, weight, body surface area, and logarithm of age (months) in the first three years.
- FRC also showed a linear increase with the logarithm of age and was positively correlated with TLCO.
- Both TLCO and FRC were found to correlate with the number of alveoli.
Conclusions:
- Infant lung gas transfer capacity (TLCO) and lung volume (FRC) progressively adapt during the first three years of life.
- These adaptations appear to be driven by growth and development, including alveolar proliferation, to meet increasing metabolic demands.
- The findings provide normative data for TLCO and FRC in early childhood and highlight their interdependence.
Abstract:
Lung transfer for CO (TLCO) was measured in 35 healthy infants. A steady state, non-invasive method using a technique of alveolar sampling was employed [3]. During the first three years of life, TLCO expressed as mmol.min-1.kPa-1 increased linearly with height (cm): y = 0.036x - 1.15 (r = 0.91); with body weight (kg): y = 0.18x - 0.005 (r = 0.85); with body surface area (m2): y = 3.48x - 0.375 (r = 0.88); and with logn of age (months): y = 0.406x + 0.184 (r = 0.88). FRC was also measured in 29 of these infants by the helium dilution technique. FRC expressed in ml increased linearly with logn of age: y = 62.24x + 62.4 (r = 0.86) and was correlated with TLCO: y = 0.05x + 0.084 (r = 0.8). TLCO and FRC were correlated with the number of alveoli [7, 9]. Thus, in the first three years of life, lung volume and lung gas transfer seem to progressively adapt in order to satisfy energetic needs during growth.