Flow, airway pressure, and transversus abdominis electromyogram (EMG) waveforms from a mechanically ventilated patient with COPD receiving pressure-support.

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Presentation transcript:

Flow, airway pressure, and transversus abdominis electromyogram (EMG) waveforms from a mechanically ventilated patient with COPD receiving pressure-support ventilation at 20 cm H2O. Flow, airway pressure, and transversus abdominis electromyogram (EMG) waveforms from a mechanically ventilated patient with COPD receiving pressure-support ventilation at 20 cm H2O. The onset of expiratory muscle activity (vertical dotted line) occurred when mechanical inflation was only partly completed, as indicated by the onset of expiratory muscle activity. Active exhalation caused an increase in airway pressure at end-exhalation, causing the ventilator to pressure-cycle rather than flow-cycle. (Adapted from Reference 29, with permission.)‏ Michael A Gentile Respir Care 2011;56:52-60 (c) 2012 by Daedalus Enterprises, Inc.