MAC meaning in Medical ?

Answer: What is Minimum Alveolar Concentration mean?

Minimum alveolar concentration or MAC is the concentration of a vapour in the alveoli of the lungs that is needed to prevent movement (motor response) in 50% of subjects in response to surgical (pain) stimulus. MAC is used to compare the strengths, or potency, of anaesthetic vapours. The concept of MAC was first introduced in 1965.

MAC actually is a median value, not a minimum as term implies. The original paper proposed MAC as the minimal alveolar concentration, which was shortly thereafter revised to minimum alveolar concentration. A lower MAC value represents a more potent volatile anesthetic.

Other uses of MAC include MAC-BAR (1.7-2.0 MAC), which is the concentration required to block autonomic reflexes to nociceptive stimuli, and MAC-awake (0.3-0.5 MAC), the concentration required to block voluntary reflexes and control perceptive awareness.

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