Clinical decision making about an athlete's return to
competition after concussion is hampered by a lack of systematic
methods to measure recovery. We applied standard regression-based
methods to statistically measure individual rates of impairment at
several time points after concussion in college football players.
Postconcussive symptoms, cognitive functioning, and balance were
assessed in 94 players with concussion (based on American Academy of
Neurology Criteria) and 56 noninjured controls during preseason
baseline testing, and immediately, 3 hr, and 1, 2, 3, 5, and 7 days
postinjury. Ninety-five percent of injured players exhibited acute
concussion symptoms and impairment on cognitive or balance testing
immediately after injury, which diminished to 4% who reported elevated
symptoms on postinjury day 7. In addition, a small but clinically
significant percentage of players who reported being symptom free by
day 2 continued to be classified as impaired on the basis of objective
balance and cognitive testing. These data suggest that
neuropsychological testing may be of incremental utility to subjective
symptom checklists in identifying the residual effects of sport-related
concussion. The implementation of neuropsychological testing to detect
subtle cognitive impairment is most useful once postconcussive symptoms
have resolved. This management model is also supported by practical and
other methodological considerations. (JINS, 2005, 11,
58–69.)