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Glossary-4 Respironics V200 Ventilator Operator’s Manual REF 1057983 A
Glossary
Definitions
Airway Pressure the pressure in the patient circuit, measured at the distal end
of the exhalation filter.
Baseline as in baseline pressure. The pressure at end exhalation.
Baud serial transmission speed usually bits/second.
Bias flow a continuous flow of gas used during expiratory phase when flow
triggering is active.
Bit binary digit.
Compliance a measure of stiffness for containers that hold gas (i.e. lungs,
patient tubing). The volume required to increase the pressure in the container
by a unit of pressure (i.e., L/cmH
2
O (hPa)).
Continuous positive airway pressure (CPAP) a mode of ventilator operation that
allows the patient to breath spontaneously from a continuous-flow or demand
valve at an elevated airway pressure. (same as CAP)
E-Cycle The E-Cycle setting on the ventilator determines when the ventilator
will transition from inspiration to expiration in PSV and NPPV modes. E-Cycle
defines the percent of peak inspiratory flow that end inspiratory flow needs to
drop to in order for inspiration to end.
End Expiratory Pressure (End Exp) the airway pressure measured at the end of
exhalation. The display is updated at the end of each exhalation.
Expiratory phase (exhalation) the part of the ventilatory cycle from the
beginning of expiratory flow to the beginning of inspiratory flow.
Flow Trigger initiation of inspiration when the patients inspiratory effort
exceeds the flow sensitivity setting (threshold).
Indicator a light, usually light emitting diode (LED).
Inspiration:Exhalation Ratio (I:E ratio) a standard I:E ratio. It is displayed as
XX:1 when exhalation period is larger than the inhalation period. It is displayed
as 1:XX when inhalation period is larger than the exhalation period.
Inspiratory phase (inspiration) the part of the ventilatory cycle from the
beginning of inspiratory flow to the beginning of expiratory flow. Any inspiratory
pause (plateau) is included in the inspiratory phase.
Inspiratory time inspiratory time (expressed in seconds) is the duration of
inspiration during mechanical ventilation. As inspiratory time increases, mean
airway pressure increases and the I:E ratio becomes lower.