flow desynchrony can happen with air hunger

Ventilator graphics including pressure vs time (top), flow vs time (middle), and volume vs time (bottom) that demonstrate flow asynchrony (arrows) and double trigger (bar) asynchronies.

Flow asynchrony occurs when the inspiratory flow is less than the patient desires. This results in patient generation of negative pressure during vigorous inspiratory effort that partially offsets the positive pressure associated with ventilator breath delivery and yields a concave appearance to the inspiratory pressure waveform (Figure 3, arrows) (choice A is incorrect).