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7 Monitoring
VLeak
(ml)
Monitoring 1 Leakage volume. The difference between the
inspiratory tidal volume (VTI) and the expiratory
tidal volume (VTE) measured by the flow sensor
and averaged over the past 8 breaths.
VLeak can indicate leaks on the patient side of
the flow sensor (endotracheal tube, chest tube,
mask). It does not include leakage between the
ventilator and flow sensor.
Displayed in NIV mode.
VLeak
(%)
Monitoring 2 Leakage percent. The percentage of the deliv-
ered inspiratory volume (VTI) that is not
returned during exhalation. Averaged flow
measurements over 8 breaths (with flow sen-
sor) allow to calculate leakage.
Leak can indicate leaks on the patient side of
the flow sensor (endotracheal tube, chest
tube). It does not include leakage between the
ventilator and flow sensor.
Displayed in NIV mode.
Vtalv
(ml)
Monitoring 2 Alveolar tidal ventilation. VTE – VDaw.
Available if CO
2
sensor is installed.
VTE
(ml)
Monitoring 1 Expiratory tidal volume. The volume exhaled by
the patient. It is determined from the flow sen-
sor measurement, so it does not show any vol-
ume added due to compression or lost due to
leaks in the breathing circuit. If there is a gas
leak at patient side, the displayed VTE may be
less than the tidal volume the patient actually
receives.
In Noninvasive modes (NIV, NIV-ST, nCPAP-PS),
VTE is replaced by VTE NIV.
Table 7-1. Monitored parameters
Parame-
ter (unit)
Monitoring
Window
Definition
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