Anyway, late last night one of my colleagues was called in to do such frozen sections. However, the patient wasn't brain-dead but rather in extremis and expected to die once removed from the mechanical ventilator. But the person started breathing on their own and didn't succumb as expected within an hour. The transplant team gave up and went home.
I found this whole scenario rather creepy and reminiscent of something out of a Robin Cook medical mystery novel (except his characters would make sure the intended donor was dead).