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Updated: Aug 22, 2025

Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus
Published on: March 6, 2019
From neonatal lung function to lung function and respiratory morbidity at 6-year follow-up
Fanny E M Goth1,2, Kent Green1, Bo M Hansen1,2
1Department of Pediatrics and Adolescence Medicine, Nordsjaellands Hospital, Hillerod, Denmark.
Insights
Moderate to late preterm children show reduced lung function by age 6 compared to term-born peers. Neonatal breathing patterns did not predict later respiratory issues in this small study.
Area of Science:
- Pediatric Pulmonology
- Neonatal Medicine
- Respiratory Physiology
Background:
- Longitudinal lung function tracking from infancy to adulthood is crucial.
- Limited data exists on lung function development in moderate to late preterm infants.
- Understanding prematurity's impact on childhood respiratory health is vital.
Purpose of the Study:
- To assess lung function at age 6 in moderate to late preterm children.
- To compare respiratory outcomes with term-born children.
- To investigate the relationship between neonatal lung function and later respiratory health.
Main Methods:
- Compared lung function of moderate to late preterm (n=48) and term-born (n=53) infants.
- Neonatal measurements included Fractional Exhaled Nitric Oxide (FeNO) and tidal breathing flow-volume loops (TBFVL).
- Age 6 assessments utilized spirometry, whole-body plethysmography, and respiratory symptom questionnaires.
Main Results:
- Preterm infants had higher neonatal TPEF/TE ratios (42.6% vs. 33.7%).
- Children born moderate to late preterm exhibited lower % predicted forced expiratory volume in 1 second at age 6 (94.4% vs. 101.9%).
- Neonatal tidal volume variability correlated with airway resistance at age 6 (β=-0.34).
Conclusions:
- Moderate to late preterm birth is associated with diminished lung function at age 6.
- Neonatal tidal breathing parameters were not predictive of subsequent respiratory morbidity or lung function.
- Further research with larger cohorts is needed to confirm these findings.
Background:
Lung function is traceable from infancy to adulthood. Only a few studies have examined lung function from birth to childhood longitudinally in children born moderate to late preterm. We aimed to investigate how prematurity and lung function in the neonatal period are related to lung function and respiratory morbidity at age 6 in former moderate to late preterm children compared with children born at term.
Methods:
Lung function was measured in a cohort of moderately to late preterm (n = 48) and term-born (n = 53) infants in the neonatal period by FeNO, and tidal breathing flow-volume loops (TBFVL) and at age 6 (n = 52) by spirometry, whole-body plethysmograph and impulse oscillation combined with a respiratory symptom questionnaire.
Results:
Moderate to late preterm children had a higher TPEF /TE ratio neonatally (42.6% vs. 33.7%, p = 0.02) and a lower % predicted orced expiratory volume in the first second at age 6 (94.4% vs. 101.9%, p = 0.01) compared to term-born children. We found a significant association between the variability of neonatal tidal volume and effective airway resistance at age 6 (β = -0.34, p = 0.03). No association between neonatal FeNO or TBFVL and respiratory morbidity at 6-year follow-up was shown.
Conclusion:
Children born moderate to late preterm had lower lung function at age 6 than term-born children. We did not find evidence for the use of neonatal tidal breathing parameters as a predictor for subsequent respiratory morbidity or lung function, however sample size was small.
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