VersaMed iVent201 - Patient Pressure Support Breath

iVent201 Operator's Manual
265
D.3.5 Patient Pressure Support Breath
A patient pressure support breath is a positive pressure patient breath in which
the ventilator maintains an elevated target pressure during inspiration. The
Pressure Support setting is a pressure above PEEP when PEEP is in use. Pressure
Support breaths are always initiated and terminated by the patient and
controlled by the ventilator. When the patient initiates a pressure support breath,
the ventilator raises the inspiratory flow to meet the patient’s demand at the
airway pressure set level.
The termination of a pressure support breath will occur when:
a) the flow decreases to 25% of the peak flow; or
b) the airway pressure exceeds a value 5 cmH
2
O above target pressure; or
c) three seconds or two breath periods have elapsed; whichever occurs first.
At that point, the ventilator terminates flow, allowing the patient to exhale.
Figure D-7: Pressure Support Breath Waveform