Depends on what they intend to teach you, how long it takes, opportunity cost, and what YOU want to do with it. A certificate may be meaningless on its own, but if they have access to a unique database of real case studies from anesthesia groups all around the nation and how they've dealt with problems both successfully and unsuccessfully, I could see it having some use. I do not think you would get this sort of anesthesia specific training from a traditional multidisciplinary mba program.