Operation
100 Instructions for use Perseus A500 SW 2.0n
Using fields with special functions
Breathing gas measurement and xMAC display (MAC multiples)
The MAC value is a simple navigation aid for
anesthetic agent delivery.
Perseus displays the measured inspiratory and
expiratory values for O
2, N2O, and anesthetic
gases, and the xMAC in the monitoring area.
Measured 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-corrected MAC values are calculated
according to the equation of W.W. Mapleson
(British Journal of Anaesthesia 1996, pp. 179-
185).
The equation applies to patients older than 1 year.
MAC
age corrected = MAC
1)
x 10
(–0.00269 x (age –40))
12203
O2
N2O
Iso
xMAC
in et
Age years
1 MAC corresponds to:
(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
2O 105 Vol%
1) 40 years
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