Experiencing the death while being alive.

It was an experience, that in an ICCU where a patient underwent a critical surgery happend to be a meditator. Claims that when the doctors and staff of ICCU was of the openion that the patient is not responding clinically,but could not take a decission to take the body out because of certain life symptoms still hower over the patient, whare the patient himself find him consious in his being but not in the body returns back to the body consious after 6 long hours. Does it possible? can someone give an openion for getting clarity over the issue.