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What kills most people during a lightning strike is the heart issues. The heart's muscle cells can generate contractions (about forty beats a minute), but not at a quick enough pace to keep a person alive. This is why the whole heart relies on the 'AV' and 'SA' nodes to set the electrical pulses that cause the heart to beat at the normal 60-80 beats a minute.
When lightning hits these two nodes, it can disrupt their electrical output or completely stop it, causing ventricular / atrial fibrillation and eventually death.
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