Covidien Puritan Bennett 540, User Manual, Page: 132 / 141

Glossary
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Puritan Bennett 540™ Ventilator User’s Manual
Minimum Inspiratory Time
Minimum inspiratory time before allowing the patient to exhale.
Minute Volume
Minute Volume represents the total amount of gas volume moved into the lungs over a 60 second
period. It is calculated by multiplying the average breath-to-breath inspired gas volume (Tidal Volume
in liters or milliliters) by the respiratory rate (in breaths per minute). Minute volume is usually
expressed in Liters per minute and is a better reflection of the patient's total ventilation status than
either respiratory rate or tidal volume alone.
Pause
Waveforms freezing function.
Patient Breath
Breathing cycle initiated by the patient.
Patient Counter
Counter of ventilation time for the patient.
Patient effort
Inspiratory effort initiated by the patient.
Patient circuit
Tubing between the ventilator and the patient.
Peak Inspiratory Pressure (PIP)
The highest pressure measured in the patient circuit during the inspiration phase.
Positive End Expiratory Pressure (PEEP)
Pressure in the patient circuit at the end of expiration.
Pressure Control
Augmentation of the patient's ventilation synchronously with inspiratory effort until a preset pressure
is met. Pressure is maintained throughout patient inspiratory flow, and is cycled to expiration by time
(controlled by the selected Inspiratory Time setting). Used in Assist/Control mode.
Pressure Support
Augmentation of the patient’s ventilation synchronously with inspiratory effort until a preset pressure
is met. Pressure is maintained until inspiratory flow is reduced to a percentage of peak flow that
depends on the expiratory sensitivity setting for the inspiration, when the ventilator cycles into
exhalation. Available in SIMV or Spontaneous modes.
PSI
Pounds Per Square Inch.
Rebreathing
The patient breathes his/her exhaled gas.