Lot's of coverage in the news on some very interesting work for "suspended animation", aka "emergency preservation and resuscitation".
This level of cooling and invasiveness is a bit more extreme than our approach, but would still have lots of applicability to Mars. Hopefully we will see some success with these tests.
Suspended Animation? Docs Try Stopping Clock to Save Lives - NBC News
Surgeons To Test Procedure That Suspends Patients Between Life And Death - Huffington Post
Humans to Be Suspended Between Life and Death in Suspended Animation - Guardian
Cryostasis isn’t sci-fi: surgeons will soon use suspended animation to revive gunshot victims - Digital Trends
Suspended Animation Coming To A Hospital Near You - B2C