The Guardian's Science Editor Ian Sample wrote in Nov 2019 about
Humans put into suspended animation for first time...
"The process involves rapidly cooling the brain to less than 10C by replacing the patient’s blood with ice-cold saline solution. Typically the solution is pumped directly into the aorta, the main artery that carries blood away from the heart to the rest of the body. Known formally as emergency preservation and resuscitation, or EPR, the procedure is being trialled on people who sustain such catastrophic injuries that they are in danger of bleeding to death and who suffer a heart attack shortly before they can be treated."
This seems to me to be proto-cryonics as well as learning lessons from the many accidental hypothermia cases.
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