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- W2414153011 abstract "To determine the imposed work of different ventilation systems at 3 levels of pressure support.Laboratory study.Teaching hospital respiratory laboratory.Healthy, human volunteers.Measurement of imposed work of breathing (WOB(i)) in six ventilators with alteration of ventilatory settings, humidification device, and triggering mechanisms.At 0 cmH2O CPAP and 0 cmH2O PSV, clinically significant (> 0.1 joules per litre or J/L) WOB(i )occurred in all systems. At 5 cmH2O pressure support ventilation (PSV) median WOB(i) ranged from 0.01 to 0.11 J/L. Removal of the pleated membrane heat and moisture exchanger (HME) significantly reduced WOB(i) (0.38 vs. 0.11 J/L, p < 0. 0001). Drawover humidification marginally increased WOB(i) (0.16 vs. 0.11 J/L, p = 0. 0001). Flow triggering reduced WOB(i) with the Servo (p < 0.0001) and Bennett ventilators (p = 0.001) but not with the Bear 1000 ventilator.Up to 7 cmH2O of PSV may be required to reduce WOB(i) related to the ventilator, circuit and humdification devices. This pressure support does not address the additional resistive effect of the endotracheal or tracheotomy tube. Higher levels of PSV may therefore be required to offset WOB(i)." @default.
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- W2414153011 date "2001-09-01" @default.
- W2414153011 modified "2023-09-23" @default.
- W2414153011 title "Effect of ventilation equipment on imposed work of breathing." @default.
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