Seizures begin as small groups of neurons firing abnormally, which coalesce into larger groups of electrically frenzied neurons that cause the seizure. When they’re in this state, those neurons can’t do their normal job.
Seizures that grow to involve critical areas of the brain that control life support activities like respiration and heart rate. If the seizure lasts long enough, the cessation of heartbeat and/or respiration can kill the victim.
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