Concussion: return-to-play guideline

Thao M. Nguyen, MD PEM fellow Fellows’ Conference June 20, 2007

2

Case

 17 yo male with LOC following a football tackle. He has retrograde amnesia to the day’s event, confusion, and initial weakness. This is his 2 nd concussion. Brought to the ER by the family for evaluation  Exam VSS; alert and oriented x 4; follows command but slightly slow in response from his baseline; nonfocal neurological exam.

 Head CT negative  Final diagnosis: closed head injury with LOC  You plan to discharge pt home in family’s care with head injury sheet. What further discharge instructions should you provide?

3

Objectives

 Definition & epidemiology  Review the symptoms & complications of concussion  Discuss the evolution of the return-to-play guidelines  Acute and long-term management

4

Definition

 “Trauma-induced alteration in mental status that may or may not involve loss of consciousness.” AAN 1997  < 10% of concussions result in LOC  Confusion and amnesia are the hallmarks of concussion  “Type of mild traumatic brain injury (TBI) caused by an impact or jolt to the head.” Pediatrics 2006  “a complex pathophysiologic process affecting the brain, induced by traumatic biomechanical forces.” CISG 2001

5

Epidemiology

 2:1 male:female  most common head injury in sports  >300,000 sport-related mild-to-mod TBIs  high school football alone • • 20% of players or 250,000 concussions/year 10% in college football players  Other risky sports: equestrian, boxing, ice hockey, wrestling, gymnastics, lacrosse, soccer and basketball  4-6x more likely to sustain a 2nd concussion Cantu. Br J Sports Med 1996

6

Epidemiology

Sports Ice hockey Football Men’s soccer Women’s soccer Field hockey Wrestling Men’s lacrosse Women’s softball Rate of concussions/1000 athlete-exposures 0.27

0.25

0.25

0.19

0.24

0.20

0.20

0.11

Kelly, Neurology 1997

7

Observed symptoms

 Vacant stare  Delayed verbal and motor responses  Confusion and inability to focus attention  Disorientation  Slurred or incoherent speech  Gross observable incoordination  Emotions out of proportion to circumstances  Memory deficits  Any period of loss of consciousness AAN Practice Parameter, Neurology 1997

8

Early symptoms: minutes to hours

 Headache  Dizziness or vertigo  Lack of awareness of surroundings  Nausea or vomiting

9

Late symptoms: days to weeks

 Persistent low grade headache  Light-headedness  Sleep disturbance  Easy fatigability  Intolerance of bright lights or difficulty focusing vision  Intolerance of loud noises, tinnitus  Irritability and low frustration tolerance  Anxiety and/or depressed mood  Poor attention and concentration  Memory dysfunction

10

Second Impact Syndrome

 case series of head and neck trauma in football players.  Death after minor second impacts in players with previous concussion syndrome who return prematurely to competition Schneider 1973  17 cases of SIS from 1991-1998 or 1-2 cases/year Cantu 1998

11

Second impact syndrome

 Pathophysiology (from animal models): • • loss of autoregulation of the brain’s blood supply cerebrovascular congestion • malignant brain swelling and marked increase in intracranial pressure • herniation  described only in adolescents and adults

12

Postconcussive Syndrome

 Fatigue  Headaches  Disequilibrium or difficulty in concentrating that may persist for weeks to months after the initial injury

13

Cumulative neuropsychological impairment

 20 adults (16-26 yo) after a 2nd concussion vs matched controls (1st concussion);  decrease in rate of information processing  longer recover time  deficits with increasing severity and duration of mental status abnormalities subsequent to each separate concussion Gronwall, Lancet 1975

14

Cumulative neuropsychological impairment

 Brain damage in boxers. “punch-drunk” syndrome, dementia pugilistica  Head blows throughout a career may result in early degenerative neurological conditions and gross cognitive impairment  Muhammad Ali’s form of Parkinson’s  AAN ban on boxing

15

When is it appropriate for an athlete who has a concussion to return to play?

16

Guidelines

 management of concussion remains a matter of controversy due to absence of evidence-based data  plethora of guidelines (> 20)  based on clinical judgment and experience  variable emphases on assessment of confusion, LOC, and/or post traumatic amnesia

17

Guidelines

 3 main management issues: • the appropriate management of the acutely injured athlete to identify potential neurosurgical emergencies • the prevention of catastrophic outcome related to acute brain swelling • the avoidance of cumulative brain injury related to repeated concussions

18

Quigley’s rule 1945

 Athletes should discontinue participation in sports after 3 cerebral concussions

19

Cantu 1986

• Widely used and adopted by the American College of Sports Medicine (ACSM)

20

Colorado Medical Society 1991

 formulated in response to several deaths secondary to head injuries in Colorado high school football players

21

American Academy of Neurology 1997

 Consensus group of neurologist, neurosx, sports med, athletic trainers, players, etc

22

Concussion in sport group (CISG)

 Vienna 2001, Prague 2004  International symposium on concussion in sport, organized by the IIHF, FIFA, IOC  Revised consensus definition: “a complex pathophysiologic process affecting the brain, induced by traumatic biomechanical forces.”  Emphasized the detailed concussion history • specific ?s as to previous concussive symptoms rather than perceived number of past concussions

23

CISG

 Recommendations: • Injury grading scales be abandoned in favor of combined measures of recovery • • Individualized return-to play guide Concussion severity retrospectively determined after:  all concussion symptoms have cleared,  the neuro exam is normal,  cognitive function has returned to baseline.

24

CISG

 New classification of concussion in sport • Simple concussion:  Injury resolves without complication over 7-10 days  Cornerstone of management is rest until all symptoms resolve and then graded program of exertion before return to sport • Complex concussion:  Persistent sx (including sx recurrence with exertion)  Specific sequelae (seizures, prolonged LOC > 1min, prolonged cognitive impairment)  H/O multiple concussions or repeated concussions with progressively less impact force  Formal neuropsychological testing plus other investigations

25

Concussion Management: Acute injury

 ANY signs or symptoms of a concussion: • Should not be allowed to return to play in the current game or practice • Should not be left alone; regular monitoring for deterioration • • Should be medically evaluated Return to play must follow a medically supervised stepwise process  “When in doubt, sit them out!”

26

Sideline evaluation

27

Sport Concussion Assessment Tool

 SCAT: developed by combining existing tools into a new standardized tool for • • Patient education Physician assessment of sports concussion

28

SCAT

29

SCAT

30

Return to play protocol

  physical and cognitive rest Step-wise process*: 1. No activity, complete rest. Once asymptomatic, proceed to step 2 2.

Light aerobic exercise (walking, stationary cycling, no resistance training) 3.

4.

5.

Sport specific exercises; progressive addition of resistance training at steps 3 &4 Non-contact training drills Full contact training after medical clearance 6.

Game play * if any sxs, drop back to previous asymptomatic level and try to progress in 24 hrs

31

Neuropsychological testing

 Assessment of cognitive function  Should not be the sole basis of a return to play decision but rather as an aid to the clinical decision making  Should not be done while the athlete is symptomatic since it adds nothing to return-to-play decisions  benefit of baseline pre-injury testing and serial post injury follow-up

32

Neuroimaging

 Conventional modalities usually normal  Head CT (or MRI) contributes little to concussion evaluation except whenever suspicion of an intra cerebral structural lesion exists: • • Prolonged disturbance of conscious state Focal neurologic deficit • Worsening symptoms  Newer structural MRI modalities (gradient echo, perfusion, and diffusion weighted) have greater sensitivity for structural abnormalities but limited use currently

33

Conclusions

 Repetitive concussions increase the risk of second impact syndrome and post-concussive syndromes  NO athlete should return to sport until all concussive symptoms have resolved at rest and with exertion  Goal: to prevent catastrophic outcomes of acute structural brain injury, second impact syndrome, and cumulative brain injury due to repetitive trauma.

 All athletes suspected of having sustained concussions should undergo thorough evaluation, including neurologic screening exam, neuropsychological testing, and exertional provocative maneuvers.

34

Back to the case…

 Concussive severity: grade 3 or complex concussion  Discharge instructions should include: • No activity, complete rest until seen by PMD in 1-2 days • May return-to-play only when asymptomatic > 1-2 weeks and only with medical clearance

35

Questions?

36

Bibliography

            American Academy of Neurology. Practice parameter: the management of concussion in sports. Neurology 1997;48:581-5 Aubry M. Summary and agreement statement of the first International Conference on Concussion in Sport, Vienna 2001. British Journal of Sports Medicine 2002;36:3 7 Cantu R. Second-impact syndrome. Clinical Sports Med 1998;1:37-44 Evans R. Concussion and mild traumatic brain injury. UpToDate version 15.1, 2007 Gronwall D. Cumulative Effect of Concussion. Lancet 1975;2:995-7 Harmon K. Assessment and Management of Concussion in Sports. American Family Physician 1999;60:??

Kelly J. Diagnosis and management of concussion in sports. Neurology 1997;48:575-80 Kirkwood M. Pediatric sport-related concussion: a review of the clinical management of an oft-neglected population. Pediatrics 2006;117:1359-71 LeBlanc C. The management of minor closed head injury in children. Pediatrics 2000;106:1525-5 McCrory P. Summary and Agreement Statement of the 2 on Concussion in Sport, Prague 2004. Clinical Journal of Sports Medicine 2005;15:48-55 nd International Conference Ruchinskas R. Mild head injury in sports. Applied Neuropsychology 1997;4:43-49 Saunders R. The second impact in catastrophic contact-sports head trauma. JAMA 1984; 254:538-9