Monitoring
148
Instructions for use Primus Infinity Empowered SW 4.5n
Age-dependent MAC values
The MAC values used in Primus Infinity
Empowered are corrected for age. Therefore make
sure the patient's age is entered correctly. Calcula-
tion follows the equation from W.W. Mapleson (Brit-
ish Journal of Anaesthesia 1996, P. 179-185). The
equation applies to patients older than 1 year of
age.
MAC
age-corrected = MAC* x 10
(–0.00269 x (age –40))
Primus Infinity Empowered automatically adjusts
the MAC calculation according to the ambient pres-
sure.
* 40 years
075
NOTE
The age "1" is used when the age is set to "<1".
Special attention is required for patients younger
than one year.
0
0
1
2
3
4
5
6
7
8
9
10 20 30 40 50 60 70 80
Influence of age on the MAC value
Vol%
Age (years)
Desflurane
1/20 N
2O
Sevoflurane
Enflurane
Isoflurane
Halothane
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