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Airway Pressure Release Ventilation

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Mechanical Ventilation in Critically Ill Cancer Patients

Abstract

Airway pressure release ventilation (APRV) was first described in 1987 by Stock and Downs [1]. It became available on commercial ventilators in the 1990s, and depending upon the brand, it may have any of the following names: APRV (Drager), BiLevel (Covidien), Bi-Vent (Maquet), Biphasic (CareFusion), and DuoPAP (Hamilton). APRV is based on the “open lung concept” and is a form of pressure-controlled intermittent mandatory ventilation using extreme inverse inspiratory–expiratory (I:E) ratios [1]. It can be most easily understood as a type of continuous positive airway pressure (CPAP) mode modified to apply two alternating levels of pressure. The majority of the respiratory cycle (T high) is spent at a high pressure (P high) to maximize alveolar recruitment, while a short period (T low) is spent at a low pressure (P low) to allow CO2 clearance. Mandatory breaths are time-triggered, pressure-targeted, and time-cycled. The patient may breathe at any time during the respiratory cycle, though due to the extreme I:E time ratio, most spontaneous breathing takes place during T high (Fig. 19.1).

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Correspondence to Stephen M. Pastores MD, FACP, FCCP, FCCM .

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Cabot, J.C., Pastores, S.M. (2018). Airway Pressure Release Ventilation. In: Esquinas, A., Pravinkumar, S., SOUBANI, A. (eds) Mechanical Ventilation in Critically Ill Cancer Patients. Springer, Cham. https://doi.org/10.1007/978-3-319-49256-8_19

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  • DOI: https://doi.org/10.1007/978-3-319-49256-8_19

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