CRM is more difficult in a medical setting as sometimes it is hard to define a team. In an operating room there isnt one "captain" but three: the surgeon, the anasthesiologist and the nurse in charge. All are aimed at the successful completion of the surgery and are interdependent, but each has the final say for their own particular role in the surgery. No one person has complete control over the OR. Conflict ensues when the aims of each role diverge.
Maybe it is not "more difficult" but merely different.ie a tweaked version will be neccessary in order to serve the medical environment. Defining 'a team' is, IMO, not the main driver in aviation CRM, forming one is often the result though. Maybe more cohesive teams would result in the '3 Captain medical environment' if CRM was better applied. Communication, the flow of information, is important. Keeping everyone abreast of changes that may initially seem unimportant, is important. What is right not who is right, as has been mentioned above is key (gotta lose the ego's). Also, TEM, which most pilots have been adept at for decades is a massive factor. Red flags pop up on most flights/missions/medical proceedures and being aware of what they are and taking conservative action to counter them is the difference between non-events and "exciting flights".
Possible? Framer.