C. Sreenan et al., High-flow nasal cannulae in the management of apnea of prematurity: A comparison with conventional nasal continuous positive airway pressure, PEDIATRICS, 107(5), 2001, pp. 1081-1083
Apnea of prematurity (AOP) is frequently managed with nasal continuous posi
tive airway pressure (NCPAP). Nasal cannula (NC) are used at low flows (< 0
.5 L/min) to deliver supplemental oxygen to neonates. A number of centers u
se high-flow nasal cannula (HFNC) in the management of AOP without measurin
g the positive distending pressure (PDP) generated.
Objective. To determine the NC flow required to generate PDP equal to that
provided by NCPAP at 6 cm H2O and to assess the effectiveness of HFNC as co
mpared NCPAP in the management of AOP.
Method. Forty premature infants, gestation 28.7 +/- 0.4 weeks (mean 6 stand
ard error of mean), postconceptual age at study 30.3 +/- 0.6 weeks, birth w
eight 1256 +/- 66 g, study weight 1260 +/- 63 g who were being managed with
conventional NCPAP for at least 24 hours for clinically significant apnea
of prematurity, were enrolled in a trial of ventilator-generated convention
al NCPAP versus infant NC at flows of up to 2.5 L/min. End expiratory esoph
ageal pressure was measured on NCPAP and on NC, and the gas flow on NC was
adjusted to generate an end expiratory esophageal pressure equal to that me
asured on NCPAP. Two 6-hour periods were continuously recorded and the data
were stored on computer.
Results. The flow required to generate a comparable PDP with NC varied with
the infant's weight and was represented by the equation: flow (L/min) = 0.
92 + 0.68x, x = weight in kg, R = 0.72. There was no difference in the freq
uency and duration of apnea, bradycardia or desaturation per recording betw
een the 2 systems.
Conclusion. NC at flows of 1 to 2.5 L/min can deliver PDP in premature neon
ates. HFNC is as effective as NCPAP in the management of AOP.