Table 2.

Breathing Pattern Changes With NCPAP

CPAP
(cm H2O)
Variable-Flow
NCPAP
Constant-Flow
NCPAP
RR
(min−1)
VT
(ml/kg)*
RR
(min−1)
VT
(ml/kg)
073 ± 165.9 ± 2.973 ± 234.8 ± 2.5
467 ± 175.4 ± 2.863 ± 194.6 ± 2.4
664 ± 186.0 ± 2.965 ± 244.8 ± 2.4
861 ± 186.0 ± 3.063 ± 164.7 ± 2.2
  • Changes in respiratory rate (RR, min−1) and VT with variable- and constant-flow NCPAP at various CPAP levels. Note the trend for decreasing RR with increasing CPAP with both devices.

  • * VT was greater with the variable-flow device at all CPAP levels (P < .001). Given the wide range patient weights (664–1461 g) at time of testing, VT was normalized to weight (mL/kg).