Table 2– Breathing pattern
ParameterSBLi-NPPVHi-NPPVp-value
SB versus Li-NPPVSB versus Hi-NPPVLi-NPPV versus Hi-NPPV
fR breaths·min−124.8±8.421.3±6.322.9±3.3nsnsns
tI s1.25±0.31.1±0.190.74±0.1ns<0.05<0.001
tE s1.46±0.751.98±0.771.93±0.34nsnsns
tI/ttot0.48±0.090.37±0.080.27±0.05<0.001<0.001<0.001
VT L0.4±0.10.56±0.110.67±0.13<0.001<0.001<0.001
VT/tI L·s−10.33±0.080.52±0.110.93±0.18<0.05<0.001<0.05
VE L·min−19.6±3.511.7±2.315.2±2.0<0.01<0.001<0.001
Air leakage L·min−110.62±5.2716.11±7.88<0.05
  • Data are presented as mean±sd, unless otherwise stated. SB: spontaneous breathing; Li: low-intensity; NPPV: noninvasive positive pressure ventilation; Hi: high-intensity; fR: respiratory frequency; tI: inspiratory time; tE: expiratory time; ttot: total time of respiratory cycle; VT: tidal volume; VE: minute ventilation; ns: nonsignificant.