Early factors associated with continuous positive airway pressure failure in moderate and late preterm infants

Using a simplified Downes score to predict the receipt of surfactant in a highly resourced setting

OBJECTIVE

The Downes score is a neonatal examination scoring tool frequently used to guide initiation of CPAP, but its ability to predict the need for surfactant has not been assessed. We assessed the extent to which the Downes score predicts the receipt of surfactant.

STUDY DESIGN

We calculated a simplified Downes score from nursing admission data for infants (≤ 2000 grams, and ≥ 25 weeks' gestation) admitted on CPAP to a highly resourced level III NICU, to assess the predictive value for the receipt of surfactant.

RESULTS

Fifty-three (31.5%) out of 168 infants admitted on CPAP received surfactant. A simplified Downes score of ≥ 4 predicted the receipt of surfactant with 90.6% sensitivity, 52.2% specificity, 46.6% positive predictive value, 92.3% negative predictive value, and 64.3% accuracy.

CONCLUSION

The high sensitivity and negative predictive value suggest utility for using the Downes score to help guide clinical decision making regarding surfactant therapy.

The Factors Associated With Continuous Positive Airway Pressure (CPAP) Failure in Late Preterm and Term Infants and Its Impact on In-Hospital Outcomes

Background and objective Late preterm and term infants commonly require continuous positive airway pressure (CPAP) on admission. However, CPAP failure in this population has not been well studied. Hence, we conducted this study to determine the impact of CPAP failure and identify antenatal factors associated with it in late preterm and term infants. Materials and methods We carried out a single-center retrospective analysis of all inborn infants of ≥34 weeks gestational age (GA) from 2012 to 2019 who received CPAP on admission to the neonatal intensive care unit (NICU). CPAP failure was defined as follows: escalation in the mode of respiratory support, surfactant administration, increase in FiO2 >0.2 above the baseline, or absolute FiO2 >0.4 for ≥3h; within 12h of admission. In-hospital outcomes and perinatal factors were compared between CPAP-failure and success groups. Multivariate stepwise binary logistic regression analysis (LRA) was used to assess the association between antenatal factors and CPAP failure.  Results Of the 272 infants included in the study, 38 (14%) failed CPAP. Infants in the failure group received a longer duration of respiratory support [median (IQR): 3.0 (5.6) vs. 0.5 (0.5)d; p<0.001], and length of stay [9 (9) vs. 4 (4)d; p<0.001]. On LRA, higher GA was associated with reduced odds of CPAP failure. Maternal hypertensive disorders, meconium-stained amniotic fluid, and group B Streptococcus (GBS)-positive status were associated with increased odds of CPAP failure. Conclusions In this cohort of late preterm and term infants, CPAP failure was associated with worse in-hospital outcomes. Lower GA, maternal hypertensive disorders, meconium-stained amniotic fluid, and GBS-positive status were associated with CPAP failure. These data, if replicated in further studies, may help develop individualized respiratory support strategies.