cerebral concussion

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Introduction

Minor head injury resulting in an immediate & transient impairment of neural function.

Classification

Concussion grading system (Colorado, 1991):

Etiology

Epidemiology

  • concussion risk for females is higher than males participating in the same sport[9]
  • adolescent girls take longer than boys to recover from their first sports-related concussion[41]
  • college football players with highest rate of concussion, 3.52 per 1000 games[30] (excluding professional football)
  • most children with concussion present to primary care rather than emergency department[31]
  • annual rate of soccer-related concussion or other closed head injuries among children in U.S. increased from 0.02% to 0.35% from 1990-2014[34]
  • 20% of adolescents report a history of concussion[40]
  • 15% of U.S. high school students report having had at least one sports-related concussion in the past year[44]

Clinical manifestations

Laboratory

Diagnostic procedures

Radiology

Complications

Management

  • athletes with suspected concussion should be removed from play immediately & not allowed to return until
    • evaluated by a licensed healthcare professional[9][25]
    • at least the remainder of the day[50]
    • removal from play reduces recovery time[33]
  • repeated cognitive & neurologic assessment may be more important than grading[2]
  • outpatient followup computerized neurocognitive testing may identify persistent symptoms not detected by other clinical assessment
  • persistent symptoms lasting > 1 hour warrant medical observation[4]
  • grade 1 concussion allows a player to return to play in the same game[3][8]
  • grade 2 concussion prohibits player from returning to game
    • player should be asymptomatic for 1 week at rest & with exercise prior to returning to competition[8]
    • 2 week recovery period for multiple grade 2 concussions
  • grade 3 concussion
    • remove from competition
    • if symptoms brief & examination findings normalize, may return home with family with observation
    • if prolonged symptoms. persistent abnormal examination, or prior concussion, emergency department evaluation with neuroimaging
    • player with brief symptoms should be asymptomatic for 1 week before returning to competition
    • player with prolonged symptoms should be asymptomatic for 2 weeks before returning to competition
    • player with second occurrence should be asymptomatic for 4 weeks before returning to competition[5][8]
  • return to work as per recommendations for return to play
  • no treatment expedites recovery or prevents long-term cognitive impairment[9]
  • post-concussion cognitive rest
    • limit activities requiring concentration[20]
    • adjust academic workload[12]
    • strict rest following concussion not helpful for children & adolescents[21]
    • most concussion symptoms improve within 3 weeks
    • persistence of symptoms longer than 3 weeks should prompt further investigation
    • students should return to baseline academic performance before returning to extracurricular activities, including sports[12]
  • physical activity at any level (light, aerobic, full) within 7 days after concussion is associated with lower rate of persistent symptoms in children (29% vs 40%)[36]
  • moderate aerobic activity after sports-related concussion reduces time to recovery[47]
  • moderate-to-vigorous physical activity within 1 week is associated with lower postconcussion symptom burden[51]
  • patient education
    • telling patients that symptoms are common after concussion significantly changes their responses[28]

Notes

More general terms

More specific terms

Additional terms

References

  1. Saunders Manual of Medical Practice, Rakel (ed), WB Saunders, Philadelphia, 1996, pg 1076
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    McCrea M et al Acute effects and recovery time following concussion in collegiate football players: the NCAA Concussion Study. JAMA 290:2556, 2003 PMID: https://www.ncbi.nlm.nih.gov/pubmed/14625332
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