Chest
Laboratory and Animal InvestigationsPerformance of Transport Ventilator With Patient-Triggered Ventilation
Section snippets
Lung Model and Ventilators
A custom-made bellows-in-a-box model lung was used to simulatespontaneous breathing (Fig 1). The space between the rigid box and the bellows simulated the pleuralspace. The upper bellows was connected to a metal T-tube through whichgas flow was injected to create negative pressure owing to the Venturieffect in the pleural space. Source gas (air at 50 lb/square inch) wasconnected to a custom-made pressure regulator and a proportionalsolenoid valve (SMC 315; SMC Co; Tokyo, Japan). Opening of the
Results
Figure 3shows typical waveforms for airway pressure plotted against time foreach ventilator when the lung model was set to aninspiratory flow rate of 40 L/min with PEEP set to 5 cmH2O and PS at 10 cm H2O.
For each of the ventilators in this study, Table 2presents data for the variables shown in Figure 2. The Esprit showedintractable self-triggering at inspiratory flow of 60 and 80 L/min, andresults that were affected by this were excluded from analysis.
During inspiration, DT at inspiratory phase
Discussion
The major findings of this study are that (1) the transportventilators we evaluated trigger inspiration well enough to synchronizewith the breathing of patients; (2) the transport ventilators had evenlower expiratory resistance than a standard ICU ventilator; and (3) the Esprit had the lowest oxygen requirement, followed by the 740, the LTV, and the TBird.
Mechanically ventilated critically ill patients of ten require transportto perform diagnostic or therapeutic procedures that cannot
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2005, ChestCitation Excerpt :Compliance of the lung model was alterable by changing a spring in the bellows. This lung model has been described in detail in previous publications.12,13 Using this model lung, we evaluated the inspiratory triggering capabilities of two ICU ventilators (Puritan-Bennett 7200ae and Puritan-Bennett 840; Tyco Healthcare; Mansfield, MA) and two bilevel pressure ventilators (BiPAP S/T-D and BiPAP Vision; Respironics).
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Supported by departmental funding. Ventilators were provided by FujiRespiratory Care Co., Ltd. and Mallinckrodt Japan Co., Ltd.