'''Minimum Alveolar Concentration''' (MAC) is a measure of the potency of an inhalation agent. It is the minimum alveolar concentration of agent required to produce immobility of 50% of patients when exposed to a noxious stimuli. Therefore, the lower the MAC, the more potent the agent. | '''Minimum Alveolar Concentration''' (MAC) is a measure of the potency of an inhalation agent. It is the minimum alveolar concentration of agent required to produce immobility of 50% of patients when exposed to a noxious stimuli. Therefore, the lower the MAC, the more potent the agent. |