Table 1.
Ten Cases of Second-Impact Syndrome and a Small Subdural Hematoma
| Case | Age/gender | Sport | First injury | Ongoing S/S | Delay to second injury (days) | Second injury | Head CT | GCS score/outcome |
|---|---|---|---|---|---|---|---|---|
| 1 | 13/male | AF | −LOC | Headache, dizziness | 0 | −LOC/RC | ASDH/UHS | 7/SND |
| 2 | 16/male | AF | −LOC | Headache | 7 | −LOC/RC | ASDH/UHS | 4/SND |
| 3 | 17/male | AF | −LOC | Headache | 14 | −LOC/RC | ASDH/UHS | 3/SND |
| 4 | 19/male | AF | −LOC | Headache | 32 | +LOC/RC | ASDH/UHS | 5/D |
| 5 | 15/male | AF | −LOC | Headache | 7 | −LOC/RC | ASDH/UHS | 4/SND |
| 6 | 15/male | AF | −LOC | Headache | 14 | −LOC/RC | ASDH/UHS | 4/SND |
| 7 | 17/male | AF | −LOC | Bell rung | 0 | −LOC/RC | ASDH/UHS | 4/SND |
| 8 | 16/male | AF | −LOC | Headache | 3 | −LOC/RC | ASDH/UHS | 3/D |
| 9 | 16/male | AF | −LOC | Headache | 28 | −LOC/RC | ASDH/UHS | 3/D |
| 10 | 10/female | AF | −LOC | Headache | 3 | −LOC/RC | ASDH/UHS | 3/D |
AF, American football; −LOC/RC, no loss of consciousness with rapid deterioration to deep coma in minutes; +LOC, loss of consciousness; ASDH/UHS, thin acute subdural hematoma with marked unilateral hemisphere swelling; SND, severe neurological deficit; D, death; S/S, signs and symptoms; GCS, Glasgow Coma Scale; CT, computed tomography.