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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, [ 1 ] and even the mildest grade of concussion can lead to second impact syndrome. [ 2 ]
If another blow to the head occurs after a concussion but before its symptoms have gone away, there is a slight risk of developing the serious second-impact syndrome (SIS). [ 62 ] [ 63 ] In SIS, the brain rapidly swells , greatly increasing intracranial pressure . [ 62 ]
A concussion, also known as a mild traumatic brain injury (mTBI), is a head injury that temporarily affects brain functioning. [8] Symptoms may include headache, dizziness, difficulty with thinking and concentration, sleep disturbances, mood changes, a brief period of memory loss, brief loss of consciousness; problems with balance; nausea; blurred vision; and mood changes.
Where men might emphasize physical symptoms of a concussion (like headaches, neck pain, and nausea), women often see more cognitive and emotional ones like visual disturbances, difficulty ...
A concussion is defined as a mild traumatic brain injury from a blow to the head or the body that causes the brain to rapidly rattle back and forth, causing symptoms that may include double vision ...
A young person who receives a second concussion before symptoms from another one have healed may be at risk for developing a very rare but deadly condition called second-impact syndrome, in which the brain swells catastrophically after even a mild blow, with debilitating or deadly results.
Symptoms can take years or decades to develop after head trauma. Researchers think the risk of CTE increases when a second head injury is sustained before an initial one heals.
The questionnaire may be self-administered, [5] administered in person by a second party, [5] or administered over telephone. [11] The questionnaire can feasibly be used as any other neuropsychological test for assessment of concussions would, including following MTBI following accidents or sports-related injury.