Monday, March 9, 2009

Waveform of the week: Trigger Delay

Trigger delay or inspiratory time delay is when there is a lag between the patient effort (pressure or flow deviation) and the rise of inspiratory flow.

A common cause of trigger delay is the result of a decreased respiratory drive, which can be present during:
  • Sleep.
  • Sedation.
  • High levels of assisted ventilation.
  • Hypocapnea.