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December 1993

Airway Pressure Release Ventilation

Author Affiliations

From the Division of Trauma/Critical Care, Department of Surgery (Drs Davis and Johnson and Mr Branson), and Departments of Respiratory Care (Mr Campbell) and Anesthesia (Dr Porembka), University of Cincinnati (Ohio) Medical Center; and US Air Force, Wilford Hall Medical Center, San Antonio, Tex (Dr Johannigman).

Arch Surg. 1993;128(12):1348-1352. doi:10.1001/archsurg.1993.01420240056010

Background:  Elevated airway pressures during mechanical ventilation are associated with hemodynamic compromise and pulmonary barotrauma. We studied the cardiopulmonary effects of a pressure-limited mode of ventilation (airway pressure release ventilation) in patients with the adult respiratory distress syndrome.

Methods:  Fifteen patients requiring intermittent mandatory ventilation (IMV) and positive end-expiratory pressure (PEEP) were studied. Following measurement of hemodynamic and ventilatory data, all patients were placed on airway pressure release ventilation (APRV). Cardiorespiratory measurements were repeated after a 2-hour stabilization period.

Results:  During ventilatory support with APRV, peak inspiratory pressure (62±10 vs 30±4 cm H2O) and PEEP (11±4 vs 7±2 cm H2O) were reduced compared with IMV. Mean airway pressure was higher with APRV (18±5 vs 24±4 cm H2O) There were no statistically significant differences in gas exchange or hemodynamic variables. Both cardiac output (8.7±1.8 vs 8.4±2.0 L/min) and partial pressure of oxgen in arterial blood (79 ±9 vs 86±11 mm Hg) were essentially unchanged.

Conclusions:  Our results suggest that while airway pressure release ventilation can provide similar oxygenation and ventilation at lower peak and end-expiratory pressures, this offers no hemodynamic advantages.(Arch Surg. 1993;128:1348-1352)

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