AVEA ventilator systems 213
L2786 Rev. M
Appendix D: Monitor Ranges and Accuracies
The volume measured during the inspiratory phase of the breath is accumulated as the inspired tidal volume, and the volume
measured during the exhalation phase is accumulated as the exhaled tidal volume. This volume does not include the volume
delivered by the Circuit Compliance Compensation function for volume breaths.
Vte Exhaled tidal volume. Exhaled volume readings are
measured by the expiratory flow sensor. This
reading may be affected by the humidifier setting in
the ventilator. When using a proximal flow sensor,
the VTe is measured as the expiratory flow goes
away from the patient at the point of insertion of the
sensor (between the patient interface and the wye)
0 to 4 L (± 20ml + 10% of reading)-Adult machine
sensor
(± 1 ml + 10% of reading)-Neonate wye
sensor
Exhaled tidal volume adjusted for patient weight
Vti Inspired tidal volume. VTi is measured by the
inspiratory flow sensor inside the ventilator and
reflects the volume without compensating for tubing
compliance. It is a calculation of the difference
between the flow delivered and the flow exhaled
during inspiration. When using a proximal flow
sensor, the VTi is measured as the inspiratory flow
(translated into volume) goes to the patient at the
point of insertion of the sensor (between the patient
0 to 4 L (± 20ml + 10% of reading)-Adult machine
sensor
(± 1 ml + 10% of reading)-Neonate wye
sensor
Vti/kg Inspired tidal volume adjusted for patient weight 0 to 4 ml/kg
Spon Vt Spontaneous tidal volume. A zero (0) Spont Vt
indicates the most recent breath was not a
spontaneous breath. It is an instantaneous value.
0 to 4 L (± 20ml + 10% of reading)-Adult machine
sensor
(± 1 ml + 10% of reading)-Neonate wye
Spon Vt/kg Spontaneous tidal volume adjusted for patient
weight
0 to 4 ml/kg
Mand Vt Mandatory tidal volume. Displayed as a rolling
average of either 8 breaths or one minute,
whichever occurs first.
0 to 4 L (± 20ml + 10% of reading)-Adult machine
sensor
(± 1 ml + 10% of reading)-Neonate wye
Mandatory tidal volume adjusted for patient weight
Vdel Total delivered machine volume measured by the
ventilator’s inspiratory flow sensor. This value will
be greater than the VTi if tubing compliance
0 to 4L (± 20ml + 10% of reading)-
% Leak Percent leakage. The difference between the
inspired and exhaled tidal volumes in terms of %
Derived Derived
Ve Minute Volume. Volume of gas exhaled by the
patient during the last minute.
0 to 99.9 L Derived
Minute volume adjusted for patient weight
Spontaneous minute volume.
Spon Ve/kg Spontaneous minute volume adjusted for patient
0 to 999ml/kg Derived
± 3% or ± 2 bpm whichever is greater
Spon Rate Spontaneous breath rate. Reflects spontaneous
rate for the last minute.
0 to 200 bpm ± 3% or ± 2 bpm whichever is greater
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