Resuscitating the recently dead?

Conventional wisdom has been that loss of circulation after a heart attack means cells have died. After just four or five minutes, the patient can't be revived because the tissues of the brain and heart have suffered irreversible damage from lack of oxygen. But new evidence shows that cells cut off from their blood supply only eventualy die hours later - leaving open the fascinating possibility that resuscitation of the apparently dead may be possible.

See Newsweek.