Katz J A, Kraemer R W, Gjerde G E
Chest. 1985 Oct;88(4):519-26. doi: 10.1378/chest.88.4.519.
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.
为了确定持续气道正压通气（CPAP）输送系统的呼吸功，我们使用肺模型来模拟自主呼吸。潮气呼吸期间的“额外功”通过比较气道压力变化与潮气量变化得出。将七种按需气流CPAP输送系统与一种持续气流、5升储气囊系统（流速为60升/分钟以维持气道正压）进行了比较。得出的结论是，按需气流CPAP输送系统在患者所需额外功的量上差异很大。当使用肺模型时，一些按需气流系统的表现与持续气流储气囊系统相当或更好。
