Fig. 3From: Six methods to determine expiratory time constants in mechanically ventilated patients: a prospective observational physiology studyFlow waveform during A pressure-controlled ventilation (PCV) and B volume-controlled ventilation (VCV) highlighting points used in different methods to obtain the expiratory time constant (τ). EOE end of exhalation, Meas. measured, VTe exhaled tidal volumeBack to article page