![]() The inhalation of air into the patient defines the inspiratory phase. The trigger phase is the initiation of an inhalation which is triggered by an effort from the patient or by set parameters by the mechanical ventilator. There are four stages of mechanical ventilation. There is the trigger phase, the inspiratory phase, the cycling phase, and the expiratory phase. Understanding the changes in compliance and resistance will allow you to pick the proper ventilator strategies. Compliance and resistance are dynamic and can be affected by the disease state(s) that led to the intubation. ![]() The TV is the volume of air entering the lung during inhalation. ![]() Mechanical ventilation works by applying a positive pressure breath and is dependent on the compliance and resistance of the airway system, which is affected by how much pressure must be generated by the ventilator to provide a given tidal volume (TV).
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