Table 2

Peak inspiratory flows, peak airway pressure and inspiratory to total cycle ratio during leak

VentilatorNo leakSmall leakLarge leak
Flow L·s−1Paw cmH2OtI/ttotFlow L·s−1Paw cmH2OtI/ttotFlow L·s−1Paw cmH2OtI/ttot
BiPAP T1.0±0.0918/50.302.1±0.113/50.302.4±0.110/50.30
BiPAP S/T1.3±0.0919/60.432.1±0.0916/60.702.5±0.112/60.79
MNPB 3351.3±0.0920/50.332.5±0.116/60.503.0±0.112/60.33
Quantum1.2±0.0918/50.332.5±0.115/40.333.0±0.112/40.46
O'NYX ACPV1.1±0.0218/70.332.1±0.0417/60.333.4±0.0517/60.88
Siemens PCV1.3±0.116/50.351.7±0.116/20.352.4±0.115/00.35
O'NYX ACV0.8±0.115/00.251.0±0.18/00.381.8±0.14/00.47
PLV 1021.5±0.020/00.331.5±0.06/00.331.5±0.04/00.33
Siemens ACV0.75±0.120/00.350.75±0.110/00.351.0±0.14/00.35
  • Data are presented as means±sd. Paw: Peak airway pressure, presented as inspiratory positive airway pressure/expiratory positive airway pressure; tI/ttot: ratio of inspiratory time to total respiratory cycle time; BiPAP: bilevel positive airway pressure; MNPB: Mallinkrodt Nellcor Puritan Bennett; ACPV: assist control pressure ventilation; PCV pressure control ventilation; ACV: assist controlled ventilation

  • peak inspiratory flow

  • trigger setting was 1.5 cmH2O.