Instructions for use Primus Infinity Empowered SW 4.5n 147
Monitoring
Gas measurement
The concentration of O2, CO2 and the anesthetic
agents N2O, halothane, enflurane, isoflurane, des-
flurane and sevoflurane are measured.
The gas concentrations are measured by the side-
stream procedure. This results in a delayed indica-
tion of the real-time values compared to the pres-
sure waveform or the flow waveform.
If an apnea occurs, the display for etCO
2 is re-
placed by the message Apnea CO
2. The apnea
time [min:sec] is displayed instead of the measured
value.
Calibration
The patient-gas measurement module is automati-
cally calibrated every time the device is started and
then regularly with ambient air, as long as the de-
vice is switched on (see chapter "Technical data",
page 261).
During calibration, messages informing the user
about the calibration appear on the screen, and the
measurement values are replaced with the word
CAL.
MAC definition
1 MAC (minimum alveolar concentration) is the an-
esthetic gas concentration in the blood at
1013 hPa, at which 50 % of patients no longer re-
spond to a skin incision with movement.
The integrated MAC algorithm is based on the MAC
values as indicated on the list. These values are
merely guideline values. It is the information on the
slip accompanying the anesthetic agents which is
binding.
The MAC values are dependent on the age of the
patient. The values indicated in the table relate to
an age of 40 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 2.10 Vol%
N
2O 105 Vol%
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