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Caution
The above data of a 40-year-old healthy male patient comes from ISO21647 and is
published by FDA.
In practice, such factors as age and weight may influence the effect of inhalational
anesthetic agent.
Below is the formula to calculate the MAC value in the presence of one or more anesthetic
agents:
“N” stands for the number of all anesthetic agents (including N2O) detected by the AG module;
“EtAgenti” stands for the end-tidal concentration of each inhalational anesthetic agent; and
“AgentVoli” stands for the 1MAC value of each inhalational anesthetic agent.
For example, if the AG module finds that the end-tidal gas for the patient contains 4% DES,
0.5% HAL and 50% N2O, the MAC value will be:
Caution
The above formula is applicable to adults.
18.5 Preparations for Measurement
1. Select a water tank appropriate for the patient type and install it onto the holder.
2. Connect one end of the gas sampling tube to the water tank.
3. Use the airway adapter to connect the other end of the gas sampling tube to the
patient.
4. Connect a waste gas exhaust tube to the exhaust port on the AG module so as to
discharge the sample gas into the waste gas treatment system.
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