2ND-IMPACT SYNDROME

Second impact syndrome (SIS) occurs when an athlete who has sustained an initial head injury, most often a concussion, sustains a second hea d injury before symptoms associated with the first have fully cleared. While most commonly reported in football, the SIS can occur during an y sport that can produce head blows. Any athlete still complaining of post-concussion symptoms after a head injury must not be allowed to re turn to play.