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At no time during the Middle Ages was there a prevalent fear that people were getting buried alive, and in no known instance did anyone rig up a bell-pull to notify the living.
Originally posted by boncho
There is a whole slew of things people might like to attribute it to, like psychic connections, maybe zombie baby?
Lazarus syndrome or autoresuscitation after failed cardiopulmonary resuscitation is the spontaneous return of circulation after failed attempts at resuscitation.
Occurrences of the syndrome are extremely rare and the causes are not well understood. One theory for the phenomenon is that a chief factor (though not the only one) is the buildup of pressure in the chest as a result of cardiopulmonary resuscitation (CPR). The relaxation of pressure after resuscitation efforts have ended is thought to allow the heart to expand, triggering the heart's electrical impulses and restarting the heartbeat. Other possible factors are hyperkalemia or high doses of epinephrine.
One example is a 61-year-old woman from Delaware, USA, who was given "multiple medicines and synchronized shocks", but never regained a pulse. She was declared dead but was discovered in the morgue to be alive and breathing. She sued the medical center where it happened for damages due to physical and neurological problems stemming from the event.