MAC values are empirical, not absolute values. The MAC values correspond to those of
healthy adults and cannot be applied to children. Age and other individual factors
influencing the behavior of volatile agents are not taken into account.
To open the MAC window
Select the AGENT or the GAS VS box (see page 9‐14 for the location).
If AGENT is set to Single in the System Config menu, the MAC window will display Mixed
Agents Not Included In MAC Calculation.
Et Gas Id
Expression MR400 Instructions for Use
Is the identifier for the given end-tidal gas
Is the current concentration of the given gas, in percent
Is the minimum alveolar concentration for the given gas at which 50 percent of a
patient population does not respond with movement to a noxious stimulus, such
as skin incision; see table below.
N2O (Nitrous oxide)
1 MAC Value
Monitoring Agents and Gases (AGENT Option) 9‐21