Manual
EICKEMEYER
®
NarkoVet
6/9
5
Preparing the Device before Anesthaesia
Check the oxygen supply (pressure and access to sufficient oxygen).
Connect patient tube and breathing bag to the anesthesia machine and close the pressure relief valve.
Keep your thumb on the patient's end of the tube and inflate the breathing bag via the
Oxygen bypass until the breathing bag is bulging. The anesthaetic system is sufficiently tight once a fresh gas flow
of less than 200 ml is needed to maintain this inner pressure.
Now check the function of the overpressure valve by fully opening it very slowly.
If the internal pressure is not adequately maintained, there is a leak in the system which has to be found before
using the anaesthetic machine.
Check the anesthetic level of the Evaporator.
A common leakage location of the evaporator is the filling tunnel with the seal plate. The rubber rings can be brittle
and disintegrate so that the seal is no longer functioning. As well an insufficiently tightened sealing block may
cause anesthetic loss.
In general, due to the built in pressure compensation of the evaporator a loss of anesthetic agent up to 0.5 cm
3
per
day can be expected.
6
Anaesthetic Procedure
Typically in a semi-closed system a fresh gas flow of 2 l/min at a selected
concentration of 3.0 vol%
at the
evaporator is sufficient for a quick wash-in. The depth of anesthaesia needs to be monitored and the concentration
to be changed if necessary.
To maintain the anaesthesia, generally it is sufficient to follow the guidelines of the MAC- 15% inspiratory
add as per the package leaflet at minimum 500 ml/min oxygen inflow (watch status of anaesthesia and breathing
continuously).
The MAC values are
Dog:
1.28%
Cat:
1.63%
Birds:
1.45%
Small mammals: 1.34%
Rat:
2.40%
Pay attention to the decreased wash-in and wash-out times of an Isoflurane-only anesthaesia in comparison to
halothane or mixed anesthaesia. In general, the evaporator should be closed just at the time of the final suture
(5 min before the intended end of the OP).
