Variability of Tidal Breathing Parameters in Preterm Infants and Associations with Respiratory Morbidity during...

Area of Science:

• Neonatal Medicine
• Pediatric Pulmonology
• Respiratory Physiology

Background:

• Preterm infants are at high risk for respiratory morbidity.
• Bronchopulmonary dysplasia (BPD) is a common outcome, but its predictive accuracy for later respiratory issues can be limited.
• Tidal volume (VT) and capnographic indices variability may offer additional predictive insights.

Purpose of the Study:

• To determine if low variability in tidal volume (VT) and capnographic indices predicts subsequent respiratory morbidity in preterm infants.
• To assess if these variability measures enhance the predictive value of bronchopulmonary dysplasia (BPD) classification for rehospitalization.

Main Methods:

• A birth cohort of 133 preterm infants was studied at 44 weeks postmenstrual age.
• Lung function measurements included the coefficient of variation (CV) for VT (CVVT) and expired CO2 volume per breath (CVVE,CO2).
• Logistic regression and Area Under the Curve (AUC) analyses assessed associations with rehospitalization, wheeze, and inhalation therapy, and the impact on BPD prediction.

Main Results:

• A decrease in CVVT and CVVE,CO2 was associated with increased odds of rehospitalization (OR 2.25 and 2.31, respectively).
• Adding CVVT or CVVE,CO2 to BPD classification significantly improved the prediction of rehospitalization (AUC increased from 0.56 to 0.66).
• No significant associations were found for wheeze or inhalation therapy.

Conclusions:

• Near-term variability of tidal breathing parameters improves the prediction of rehospitalization in preterm infants compared to BPD classification alone.
• These findings can inform improved monitoring and counseling strategies for parents of preterm infants.
• Variability in VT and capnography offers a valuable, non-invasive tool for risk stratification in this population.