Glossary

Pressure Sensitivity a measure of the amount of negative pressure that must be generated by a patient to trigger a mechanical ventilator into the inspiratory phase; alternatively, the mechanism used to set or control this level.

Pressure Trigger initiation of inspiration when the patients inspiratory effort exceeds the sensitivity threshold.

PVC O2 Sensor Tee An external oxygen sensor adapter made of polyvinyl chloride (PVC). This O2 Sensor Tee is gray in color and cannot be autoclaved or chemically disinfected.

Rapid Shallow Breathing Index (F/VT) used to evaluate the adequacy of the patients spontaneous ventilation. It is calculated by as shown below

f/Vt = (Spont Rate)/(Spont VE)

Resistance The pressure drop across a pneumatic device (i.e. bacteria filter, patient circuit tubing) for a unit of flow when the volume of the device remains constant, i.e., (cmH2O (hPa))/mL/sec.

Risetime the time required for a pressure support or pressure controlled breath to reach its target pressure.

RS-232ANSI standard for communication.

Spontaneous Respiratory Rate (Spont Rate) the average rate of the spontaneous breaths in the last eight breaths delivered by the ventilator.

Spontaneous Volume Exhaled (Spont VE) the exhaled volume that would come from spontaneous breaths, projected over one minute. The calculation is done by averaging the spontaneous exhaled tidal volume from the last eight breaths and projecting what that volume would be if it continued for one minute.

Tidal Volume (Tidal Vol) the volume of patient gas as measured at the exhalation flow transducer. The display shows an average unless the current breath differs substantially from the average. When there is a substantial change, the current breath is displayed. The average for tidal volume is restarted when the operator changes the tidal volume setting and the machine is delivering mandatory breaths.

Time Trigger initiation of inspiration by the ventilator according to the respiratory frequency (Rate) setting.

Total Respiratory Rate (Total RR) the total breaths taken, spontaneous breath rate + mandatory breath rate, from the last eight breaths and projecting what that rate would be if it continued for one minute.

Total Volume Exhaled (Total VE) the total exhaled volume that would come from all the patient’s breaths, projected over one minute. The calculation is done by averaging the total exhaled tidal volume from the last eight breaths and projecting what that volume would be if it continued for one minute. This value is updated at the end of each exhalation.

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Respironics V200 Ventilator Operator’s Manual

REF 1057983 A

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Philips V200 manual Glossary-6

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