Instructions for use – Infinity Acute Care System – Monitoring Applications VG6.n 377
Scio Monitoring
xMAC (MAC multiple)
The xMAC value is a simple navigation aid for
anesthetic agent delivery.
IACS displays the inspiratory and expiratory
measured values for O2, N2O, anesthetic gases,
and the xMAC.
The xMAC is the MAC multiple calculated from the
current expiratory measured values and the age-
dependent MAC values. If no respiratory phase is
detected, expiratory values and xMAC cannot be
displayed.
The integrated xMAC 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 are dependent upon the age of the
patient. The values specified in the table (according
to ISO 80601-2-55) apply to a patient age of 40
years.
IACS provides age-corrected xMAC if the user has
entered a birth date for the patient.If no birth date is
entered, IACS uses 40 years as the age.
The age-corrected MAC values are calculated
using an equation developed by 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))
Agent MAC corresponds to:
(in 100% O2)
Desflurane 6.0 Vol%
Enflurane 1.7 Vol%
Halothane 0.77 Vol%
Isoflurane 1.15 Vol%
N
2O105 Vol%
Sevoflurane 2.1 Vol%
1 40 years
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