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Updated: Sep 27, 2025

Conducting Respiratory Oscillometry in an Outpatient Setting
Published on: April 8, 2022
Longitudinal changes in lung function in very prematurely born young people receiving high-frequency oscillation or
Alessandra Bisquera1, Christopher Harris2,3, Alan Lunt2,3
1School of Population Health and Environmental Sciences, King's College London, London, UK.
Insights
Lung function in extremely premature adolescents showed significant changes over time, regardless of initial ventilation mode. Factors like sex and birth weight, not ventilation strategy, influenced lung health trajectories.
Area of Science:
- Pediatric Pulmonology
- Adolescent Health
- Respiratory Medicine
Background:
- Extremely premature birth can impact long-term lung development.
- Understanding lung function changes during adolescence is crucial for this population.
Purpose of the Study:
- To examine longitudinal changes in lung function in extremely prematurely born adolescents.
- To determine if initial ventilation mode (high-frequency oscillation vs. conventional ventilation) influences these changes.
Main Methods:
- Longitudinal follow-up study of adolescents born extremely prematurely.
- Assessed lung function (FEV1, FVC, DLCO, etc.) at two time points (11-14 and 16-19 years).
- Compared lung function trajectories between high-frequency oscillation (HFO) and conventional ventilation (CV) groups using mixed models.
Main Results:
- Significant changes in lung function parameters (FEV1, FVC, DLCO) were observed in both ventilation groups.
- No significant differences in lung function changes were found between HFO and CV groups.
- Factors such as male sex, white ethnicity, lower gestational age, and postnatal corticosteroid use were associated with lung function decline.
Conclusions:
- The mode of ventilation at birth had minimal impact on lung function changes during adolescence.
- Lung function trajectories are influenced by various factors beyond the initial ventilation strategy.
Objective:
To examine changes in lung function over time in extremely prematurely born adolescents.
Working Hypothesis:
Changes in lung function during adolescence would vary by ventilation mode immediately after birth.
Study Design:
Longitudinal follow-up study.
Patient Subject Selection:
Participants from the United Kingdom Oscillation Study who were randomized at birth to high-frequency oscillation (HFO) or conventional ventilation (CV) were assessed at 11-14 years (n = 319) and at 16-19 years (n = 159).
Methodology:
Forced expiratory flow (FEF), forced expiratory volume in 1 s (FEV1), forced vital capacity (FVC), and lung volumes including functional residual capacity (FRC) were reported as z-scores. The diffusion capacity of the lungs for carbon monoxide (DLCO) was measured. Lung function trajectories were compared by mode of ventilation using mixed models. Changes in z-scores were scaled to 5-year average follow-up.
Results:
There were significant changes in the mean FEF75, FEF50, FEF25, FEV1, FVC, and DLCO z-scores within the CV and HFO cohorts, but no significant differences in the changes between the two groups. The mean FRC z-score increased in both groups, with an average change of greater than one z-score. The mean FEV1/FVC z-score increased significantly in the CV group, but not in the HFO group (difference in slopes: p = 0.02). Across the population, deterioration in lung function was associated with male sex, white ethnicity, lower gestational age at birth, postnatal corticosteroids, oxygen dependency at 36 weeks postmenstrual age, and lower birth weight, but not ventilation mode.
Conclusions:
There was little evidence that the mode of ventilation affected changes in lung function over time.
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