Toward Optimal High Continuous Positive Airway Pressure as Postextubation Support in Preterm Neonates: A Retrospective Cohort Study.

OBJECTIVE

This study aimed to evaluate whether the initial pressure level on high continuous positive airway pressure (CPAP; ≥9 cm HO), in relation to preextubation mean airway pressure (Paw), influences short-term clinical outcomes in preterm neonates.

STUDY DESIGN

In this retrospective cohort study, preterm neonates <29 weeks' gestational age (GA) extubated from mean Paw ≥9 cm HO and to high CPAP (≥9 cm HO) were classified into "higher level CPAP" (2-3 cm HO higher than preextubation Paw) and "equivalent CPAP" (-1 to +1 cm HO in relation to preextubation Paw). Only the first eligible extubation per infant was analyzed. The primary outcome was failure within ≤7 days of extubation, defined as any one or more of (1) need for reintubation, (2) escalation to an alternate noninvasive respiratory support mode, or (3) use of CPAP >preextubation Paw + 3 cm HO. Secondary outcomes included individual components of the primary outcome, along with other clinical and safety outcomes.

RESULTS

Over a 10-year period (Jan 2011-Dec 2020), 175 infants were extubated from mean Paw >9 cm HO to high CPAP pressures. Twenty-seven patients (median GA = 24.7, [interquartile range (IQR)]: (24.0-26.4) weeks and chronological age = 31, IQR: [21-40] days) were classified into the "higher level CPAP" group while 148 infants (median GA = 25.4, IQR: [24.6-26.6] weeks and chronological age = 26, IQR: [10-39] days) comprised the "equivalent CPAP" group. There was no difference in the primary outcome (44 vs. 51%; = 0.51), including postadjustment for confounders (adjusted OR [aOR] = 0.47 [95% confidence interval (CI): 0.17-1.29;  = 0.14]). However, reintubation risk within 7 days was lower with higher level CPAP (7 vs. 37%; < 0.01), including postadjustment (aOR = 0.07; 95% CI: 0.02-0.35; < 0.01).

CONCLUSION

In this cohort, use of initial distending CPAP pressures 2 to 3 cm HO higher than preextubation Paw did not alter the primary outcome of failure but did lower the risk of reintubation. The latter is an interesting hypothesis-generating finding that requires further confirmation.

KEY POINTS

· Use of high CPAP pressures (≥9 cm H2O) is gradually increasing in the care of preterm neonates.. · This study compares higher level versus equivalent CPAP in relation to preextubation Paw.. · The findings demonstrate no difference in failure as defined with use of higher level CPAP pressures..