On his latest story he told us of a procedure called Deep Hypothermic Circulatory Arrest or Aortic Arch Replacement. Wikipedia explains it best.
A surgical procedure that involves cooling the body of the patient and stopping blood circulation. It is used to repair brain aneurysms and aortic arch defects.
The procedure requires keeping the patient in a state of hibernation at 15 degrees Celsius with no breathing, heartbeat, or brain activity for up to one hour. Blood is drained from the body to eliminate blood pressure. The patient is considered clinically dead during the operation.
Apparently this operation can be done on 2 month old babies to the very elderly.