Is there a text book answer as to what differentiates MAC from GA?

The surgeons at one site I go to often request a "big MAC" in which they basically do not want the patient to move at all. There is also an expectation that the patient does not have recall.

In these cases we use a standard face mask with the Co2 detector snaked in the side. The same case under GA would involve an LMA - the doses of anesthetic would be higher with in the GA case, but mostly just due to the stimulation of the LMA.

As a brand new SRNA these MAC have been very challenging, but I'm wondering if anyone has either a text book or a their own definition of when MAC becomes GA. One reason I am asking is that I would think with a MAC case it would hard to guarantee no recall (as this site wants the CRNAs to do)?