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Chest, Vol 88, 519-526, Copyright © 1985 by American College of Chest Physicians

ARTICLES

Inspiratory work and airway pressure with continuous positive airway pressure delivery systems

JA Katz, RW Kraemer and GE Gjerde

To determine work-of breathing with continuous positive airway pressure (CPAP) delivery systems, we used a lung model to simulate spontaneous breathing. "Additional work" during tidal breathing was derived by comparing change in airway pressure with change in tidal volume. Seven demand-flow CPAP delivery systems were compared with one continuous- flow, 5-L reservoir-bag system (flow of 60 L/min to maintain positive airway pressure). It was concluded that demand-flow CPAP delivery systems vary widely in the amount of additional work required of a patient. When a lung model is used, some demand-flow systems perform as well as, or better than, a continuous-flow reservoir-bag system.


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