Electrocution
In accidental electrocutions, usually involving low, household current, the most common cause of death is arrhythmia, stopping the heart dead. Unconsciousness ensues after the standard 10 seconds, says Richard Trohman, a cardiologist at Rush University in Chicago. One study of electrocution deaths in Montreal, Canada found that 92 per cent had probably died from arrhythmia.
Higher currents can produce nearly immediate unconsciousness. The electric chair was designed to produce instant loss of consciousness and painless death - a step up from traditional hangings - by conducting the current through the brain and the heart.
There have been many botched executions - those that required several jolts to kill, or where flames leapt from the prisoner's head, in one case due to a damp synthetic sponge being attached to the electrodes on the prisoner's head, which was such a poor conductor it was heated up by the current and caught fire.
However, John Wikswo, a biophysicist at Vanderbilt University in Nashville, Tennessee, maintains that the thick, insulating bones of the skull would prevent sufficient current from reaching the brain, and prisoners could instead be dying from heating of the brain, or perhaps from suffocation due to paralysis of the breathing muscles - either way, an unpleasant way to go.There have been many botched executions - those that required several jolts to kill, or where flames leapt from the prisoner's head.
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