For some reason reading all this makes me see death as a less scary thing.
The nodes in the human heart provide electrical impulses that cause the heart muscles to beat, this is controled by the brain which is linked to the heart nodes by nerves.
A mains current is not required, this is more 'pacemaker' voltage than defibrilator.
Thank god for citations.
Raar!
No brain activity could last longer than 10 minutes or so. Unconsciousness comes quicker though.