Viva 6

Scenario:  A forty-three (43) year old man, previously fit and well is brought into the Emergency Department having been found at home unconscious by his wife.   He had last been seen six (6) hours previously. Pupils are reactive, GCS 8, breathing spontaneously, no focal signs.
Introductory question: What is the differential diagnosis?
Fifteen out of twenty-three candidates passed this section.

Disclaimer: the viva stem above may be an original CICM stem, acquired from their publicly available past papers. Or, perhaps it is a slightly altered version of the original CICM stem. Or, it is a completely original viva stem, concocted by the monstrously amoral author of Deranged Physiology for nothing more than his own personal amusement. In either case, because the college do not make the main viva text or marking criteria available, almost everything here has been confabulated. It might sound like a plausible viva and it could be used for the purpose of practice, but all should be aware that it does not represent the "true" canonical CICM viva station.