Airway Pressure Release Ventilation and BIPAP
Pressure release ventilation is a new mode of ventilatory support in which intermittent CPAP release provides mechanical assistance to alveolar ventilation. It differs from intermittent positive pressure ventilation (IPPV) and inspiratory pressure support as far as pressure changes throughout the respiratory cycle: during these two modes, either a preset tidal volume (VT) or a preset inspiratory pressure are delivered by the ventilator to the patient and, as a consequence, airway pressure increases during the inspiratory phase; during pressure release ventilation, passive exhalation of the respiratory system follows CPAP release and is associated with a marked decrease in airway pressure, the pressure re-increasing during the next respiratory cycle. Because of the limitation of the increase in peak airway pressure, the risk of pulmonary barotrauma is theoretically reduced.
KeywordsTidal Volume Airway Pressure Pressure Support Pressure Support Ventilation Ventilatory Mode
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