145
Fig. 17-1 AG Display Interface
The AG module can display all the measured waveforms and parameters on the screen of the
monitor, including:
z CO2, O2, N2O, and AA waveform;
z AWRR: airway respiration rate;
z MAC: minimum alveolar concentration;
z CO2, O2, N2O, and AA end-tidal (Et) value and inhalation (Fi) value.
“AA” stands for one of such five anesthetic gases as Des, Iso, Enf, Sev, or Hal.
18.4 MAC Value
As a basic index reflecting the depth of inhalation anesthesia, MAC (minimum alveolar
concentration) is defined by the standard ISO21647 as the alveolar concentration of an
inhalational anesthetic agent in balanced state in the absence of any other anesthetic agent, which
can prevent the body movements of 50% patients under a standard surgical stimulation.
Below are the 1MAC values for inhalational anesthetic agents:
Anesthetic
Agent
DES ISO ENF SEV HAL N2O
1MAC 7.3%* 1.15% 1.7% 2.1% 0.77% 105%**
*: This figure comes from a 25-year-old patient.
**: This 1MAC value for N2O is only obtained in a high-pressure chamber.
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