SIS: Second Impact Syndrome

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Athletes are particularly prone to Second Impact Syndrome, a brain injury that occurs as a result from a second concussion when the first one has not had enought time to heal. One of the dangers of SIS is the subtlety of the injury:

“At the onset of SIS the athlete is usually stunned, but does not lose consciousness and often completes the play. In the next 15 seconds to several minutes, however, the athlete’s brain is severely compromised by a chain reaction. The impact may cause blood vessels to tear, a blood clot forms, and the flow of blood is greatly reduced causing the brain to swell. This creates pressure on the brain stem, which controls breathing. Shortly thereafter, respiratory failure begins, and the athlete collapses with rapidly dilating pupils and loss of eye movement.”

Read Athletes at Risk: Second Impact Syndrome in Sports

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