Late Cycling in Pressure Control Mode

The following waveforms show a pressure spike that begins in mid-inspiration, with the pressure during latter half of the inspiratory phase rising above the initial set pressure. This occurs when the patient attempts to exhale before the set inspiratory time ends, causing an increase in intrathoracic pressure that is reflected as a pressure rise on the airway pressure waveform. This phenomenon, known as late cycling, occurs when the set inspiratory time exceeds the patient's neural inspiratory time.