Monitoring Mechanical Ventilation Using Ventilator Waveforms by Jean-Michel Arnal

Author:Jean-Michel Arnal
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

All of the statements regarding pressure support are true except:1.The inspiratory trigger event is visible on the pressure curve

2.The inspiratory flow is variable depending on patient inspiratory effort

3.The inspiratory time is preset

4.The expiratory cycle threshold is based on flow

5.The respiratory rate is controlled by the patient

4.1.2 Inspiratory Trigger

The patient’s inspiratory effort is detected as a deformation of the pressure or flow waveform. Pressure triggering requires patient effort to decrease the airway pressure from PEEP down to a preset threshold. During the pre-trigger phase, airway pressure decreases and flow is zero. With flow triggering, a continuous bias flow is maintained through the ventilator circuit. When the patient generates an inspiratory effort, a fraction of the base flow deviates to the patient. The drop in expiratory flow below the base flow is the signal for triggering inspiration. During the pre-trigger phase, airway pressure decreases and flow increases slightly.

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