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Second impact syndrome

P R McCrory1, S F Berkovic

  • 1Department of Medicine, University of Melbourne, Australia.

Neurology
|April 1, 1998
PubMed
Summary
This summary is machine-generated.

Second Impact Syndrome (SIS) is a rare brain injury. This study found insufficient evidence to support SIS as a cause of diffuse cerebral swelling in sports, challenging current concussion protocols.

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Area of Science:

  • Sports Medicine
  • Neurology
  • Trauma Research

Background:

  • Second Impact Syndrome (SIS) is a theoretical complication of sports-related concussions.
  • Current concussion management guidelines often assume SIS is a significant risk factor for diffuse cerebral swelling.
  • The diagnostic criteria and incidence of SIS remain debated.

Purpose of the Study:

  • To establish diagnostic criteria for Second Impact Syndrome (SIS).
  • To analyze published cases for evidence supporting SIS.
  • To evaluate the reliability of recalled concussion episodes in diagnosing SIS.

Main Methods:

  • Developed specific criteria for definite, probable, and possible SIS.
  • Reviewed all published case reports consistent with SIS.

Related Experiment Videos

  • Assessed the accuracy of teammate-recalled concussion episodes versus self-reports and video analysis.

    • Main Results:

    • Out of 17 reported cases, only five met the probable SIS criteria.
    • Teammate recall of concussions was significantly less accurate than self-reports and video analysis.
    • The link between SIS and diffuse cerebral swelling is not definitively established by existing case reports.

    Conclusions:

    • The existence and incidence of Second Impact Syndrome (SIS) as a cause of diffuse cerebral swelling are not well-established.
    • Current concussion management guidelines based on SIS may require reevaluation.
    • Effective prevention strategies for sports-related cerebral swelling are hindered by the lack of confirmed risk factors like SIS.