Covidien Puritan Bennett 540, User Manual, Page: 131 / 141

Puritan Bennett 540™ Ventilator User’s Manual
F-3
Flow
Volume of gas delivered by the ventilator compared to time, expressed in
liters per minute (lpm).
Freeze
Interruption of the waveform plot tracing on the ventilator’s display.
I:E ratio
Inspiratory time versus exhalation time ratio.
Inspiratory minute volume (Min VI)
Volume delivered to the patient at each inspiratory phase and multiplied times the
respiratory rate.
Inspiratory Phase
Phase of the breath cycle during which the patient inspires.
Inspiratory Sensitivity
Level of inspiratory effort the patient has to provide during the initiation of a machine breath. The
sensitivity levels (from 1 to 5) correspond to differences in flow compared to the bias flow. The level 1
is the most sensitive (for a pediatric use) and requires the least effort to trigger breath. The level 5
requires the most amount of effort to trigger a breath.
Inspiratory Tidal Volume (VTI)
Volume delivered to the patient at each inspiratory phase.
I Time
Inspiratory time measure.
L
Liters (a unit of volume).
LED
Light Emitting Diode; used as indicator lights on the ventilator’s front panel.
lpm
Liters Per Minute (a unit of volume flow rate).
Machine Hours
Counter for the total ventilation time since manufacture or the last CPU board change.
Mains
AC power supply.
MAP
Mean Airway Pressure. Average pressure during a ventilation cycle.
Minimum Exhalation Time
Minimum exhalation time before allowing the patient inspiratory trigger.