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Diffuse cerebral swelling with delayed catastrophic deterioration, a known complication of brain trauma, has been postulated to occur after repeated concussive brain injury in sports-the "second impact syndrome" (SIS). Certain current concussion management guidelines are contingent upon this assumption. We established criteria for definite, probable, and possible SIS and analyzed all published cases. A total of 17 cases were identified in which the reports described the cases as being consistent with SIS. Of these, only five probable cases of SIS were found based on our diagnostic criteria. We also studied the accuracy of recalled episodes of minor concussion in football players by their teammates because the diagnosis of SIS is usually based on such accounts. We found overreporting of recalled episodes of concussion in teammates when compared with self reports and videotape analysis. Based on case reports, the claim that SIS is a risk factor for diffuse cerebral swelling is not established. Prevention strategies for sports-related cerebral swelling are difficult to implement in the absence of established risk factors.

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Published In

Volume 50Number 3March 1998
Pages: 677-683
PubMed: 9521255

Publication History

Published online: March 1, 1998
Published in print: March 1998


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Affiliations & Disclosures

Paul R. McCrory, FRACP, FACSM
From the Department of Medicine (Neurology) (Drs. McCrory and Berkovic), University of Melbourne, Austin and Repatriation Medical Centre, Heidelberg, Australia; and the Olympic Park Sports Medicine Centre (Dr. McCrory), Melbourne, AustraliaM. is supported by the National Health and Medical Research Council of Australia and the National Sport Research Program of the Australian Sports Commission.
Samuel F. Berkovic, MD, FRACP
From the Department of Medicine (Neurology) (Drs. McCrory and Berkovic), University of Melbourne, Austin and Repatriation Medical Centre, Heidelberg, Australia; and the Olympic Park Sports Medicine Centre (Dr. McCrory), Melbourne, AustraliaM. is supported by the National Health and Medical Research Council of Australia and the National Sport Research Program of the Australian Sports Commission.


Address correspondence and reprint requests to Dr. Paul McCrory, Department of Neurology, Austin and Repatriation Medical Centre, Heidelberg, Victoria, Australia 3084.

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