Instructions for use Primus Infinity Empowered SW 4.5n 149
Monitoring
xMAC display (MAC multiple)
The MAC value is a simple navigation aid for anes-
thetic agent metering.
Primus Infinity Empowered indicates the MAC mul-
tiple (xMAC), which is determined from the present
expiratory measurements and the age-dependent
MAC values. In the case of gas mixtures, the re-
spective multiples for nitrous oxide and the anes-
thetic agents are added in accordance with the fol-
lowing equation.
Example:
exp. Sev. = 1.5 Vol%; exp. N
2O = 60 %;
age = 10 years
MACage-corrected of Sev.: MAC* = 2.2 Vol%
MAC
age-corrected of N2O: MAC* = 125 Vol%
xMAC = 0.7 + 0.5 = 1.2
The influence of other medication (opiates or intra-
venous hypnotics) is not taken into account when
calculating MAC values.
Mixture detection
Primus Infinity Empowered automatically detects
the anesthetic gas used and switches the measure-
ment and monitoring of anesthetic gas concentra-
tion to the gas detected.
If there is a mixture of two volatile anesthetic
agents, the concentration of the secondary anes-
thetic agent is displayed if the xMAC value is
0.1 MAC or greater. The gas with the higher expir-
atory xMAC value is displayed above the second-
ary gas.
A secondary anesthetic agent becomes the main
anesthetic agent if its xMAC value exceeds the
MAC value of the main anesthetic agent by
0.2 MAC.
A mixture of more than two volatile anesthetic
agents cannot be reliably detected. The anesthetic
gas values are no longer displayed and an alarm is
generated.
xMAC= + +
exp. conc. agent
1 exp. conc. agent2 exp. conc. N2O
MAC
age-corrected
agent
1
MACage-corrected
agent
2
MACage-corrected
N
2O
* 10 years
NOTE
A mixture of more than 2 anesthetic agents may
lead to a temporary failure of the measured O
2
value.
WARNING
Risk of patient injury
If the anesthetic agent displayed does not
match the label of the anesthetic vaporizer be-
ing applied (open), make sure the vaporizer is
filled correctly.
To Next Page
Loading...
