Volume reflector
RBF 91%
3
2
1
The volume reflector tab shows real time data
relevant to the volume reflector and level
patient re-breathing:
1. VRI (Volume Reflector Indicator)
2. VR Balance (Volume Reflector Balance)
3. RBF (Rebreathing Fraction)
This function is not available in MAN mode.
When switching from MAN to AUTO, or
between AUTO modes, volume reflector data
becomes available after 3-4 complete
breathing cycles.
VRI (Volume Reflector Indicator)
The VRI is a graphic representation of the ratio
of reflector gas (white) to exhaled gas (gray)
in the volume reflector. The diffusion point, i.e.
border between white and gray, moves back
and forth with each breathing cycle.
The color used to distinguish reflector gas
from exhaled gas may vary depending on
country specific standards.
The left half of the VRI represents gas that is
being continuously evacuated via the AGS
(Anesthetic Gas Scavenging) system. The
majority of this gas volume is usually the
reflector module drive gas (O
2
).
At the end of expiration, the diffusion point
should be left of the rectangle centre,
indicating that patient gas is also being
evacuated.
If no patient gas is being evacuated, i.e. the
diffusion point never reaches half way during
expiration, reflector gas (O
2
) will eventually
enter the breathing system, creating a
'wash-out' situation. Most likely, this is caused
by a leak in the breathing circuit.
The VRI is complemented with the volume
reflector balance metric; VR Balance. This
numerical value describes the net flow of gas
in the volume reflector, see next section.
FLOW-i 4.2, User's Manual
111
| System functionality |
5 |
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