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Second Impact Syndrome

Second Impact Syndrome


Second Impact Syndrome (SIS), also called recurrent traumatic brain injury, refers to when an individual suffers a second traumatic brain injury before the symptoms of an earlier traumatic brain injury have completely healed. The condition is quite rare, but extremely dangerous. The second impact may occur several weeks after the first and may not initially appear to be serious; it need not involve loss of consciousness.    The second impact, even though minor, can be fatal, though the reason is not fully understood. It is believed that the second blow to the head can impede the body’s ability to autoregulate blood flow to the brain. Consequently, the brain swells, increasing intracranial pressure (ICP) and displacing the brain (herniation). The time from the second impact to complete brainstem failure is extremely rapid, usually occurring in fewer than five minutes. If this occurs there is very little hope for recovery. In non-fatal cases, long-term effects include muscle spasms, emotional instability, cognitive impairment, and hallucinations. 
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