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Instructions for use
|
Atlan A300, A300 XL, A350, A350 XL SW 1.0n
103
Operation
7.5
Using fields with special functions
7.5.1
Breathing gas measurement and xMAC display (MAC multiple)
Prerequisite: The device has the "Integrated patient-gas measurement module"
option.
The MAC value is a guideline for anesthetic agent delivery.
The device displays the measured inspiratory and expiratory values for
O
2
,
N
2
O
,
and anesthetic gases as well as the
xMAC
in the monitoring area. The nitrous oxide
concentration or anesthetic gas concentration is only displayed when it is not zero.
The xMAC is the MAC multiple calculated from the current expiratory measured
values and the age-dependent MAC values. If no respiratory phases are detected,
expiratory values and xMAC cannot be displayed.
The integrated MAC algorithm is based on the MAC values shown in the following
table. These values are guiding values only. The binding values are specified on the
package information leaflet of the anesthetic agent.
The MAC values depend on the age of the patient. The values specified in the table
apply to a patient age of 40 years.
The age-adjusted MAC values are calculated according to the equation of W.W.
Mapleson (British Journal of Anaesthesia 1996, pp. 179-185).
3531
0
1 MAC corresponds to the following concen-
tration:
(In 100 % O
2
)
Halothane
0.77 Vol%
Enflurane
1.7 Vol%
Isoflurane
1.15 Vol%
Desflurane
6.0 Vol%
Sevoflurane
2.1 Vol%
N
2
O
105 Vol%
in
et
years
xMAC
Age
O2
N2O
Iso