I wonder it's more serious than a seizure, and a full disclosure isn't being made.
http://www.foxnews.com/story/0,2933,356506,00.html
Dr. Jennifer H. Mieres, a cardiologist and associate professor of medicine at New York University School of Medicine who has not treated Kennedy, said a stroke may sometimes lead to a seizure or present itself as a seizure.
"It may manifest as a seizure in which the person will lose consciousness and may shake all over," she said. "So strokes and seizures can be linked. However, sometimes seizures can be a manifestation of other things, such as tumors of the brain. So we'll have to wait and see if he had a seizure that was unrelated to a stroke or possibly a mini stroke."