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About: Second-impact syndrome     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatSyndromes, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: ThingDiseaseyago:Abstraction100002137yago:Cognition100023271yago:Complex105870365yago:Concept105835747yago:Content105809192yago:Idea105833840yago:PsychologicalFeature100023100diseaseyago:Syndrome105870790yago:Whole105869584yago:WikicatSyndromes New Facet based on Instances of this Class

Second-impact syndrome (SIS) occurs when the brain swells rapidly, and catastrophically, after a person has a second concussion before symptoms from an earlier one have subsided. This second blow may occur minutes, days, or weeks after an initial concussion, and even the mildest grade of concussion can lead to second impact syndrome. The condition is often fatal, and almost everyone who is not killed is severely disabled. The cause of SIS is uncertain, but it is thought that the brain's arterioles lose their ability to regulate their diameter, and therefore lose control over cerebral blood flow, causing massive cerebral edema.