Background: My husband had a bicycle accident several weeks ago with injuries that included closed head trauma. He has no memory of it. He lost consciousness repeatedly. He couldn't stand or walk on his own and was fairly incoherent. (These symptoms continued, in varying degrees, for several hours.)

About 45 minutes later, he had an urgent need to defecate, a seizure (tonic clonic), then violent vomiting.

The hospital CT didn't disclose a problem, and subsequent MRI and EEG studies showed no brain or electrical abnormalities that would have triggered or resulted from the accident.

Question: Because he had a seizure almost an hour after the accident, how likely is he to have a subsequent seizure, and during what time frame would it most likely occur?

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