first -- to see symptoms of a seizure. but once someone is diagnosed and has a seizure like this the concern with sudep is right after the seizure the brain is affected in such a way the person may develop apnea, again stop breathing or this heart murmur that can be fatal. >> and can medication control that? >> yeah, when it comes to this sudep itself is so particularly rare, 1 in 1,000 people, they try to figure out who are these 1 in a 1,000 people. and what they have found are that people who haven't taken medication are more likely to develop sudep. but that's not always the case. there people who have done everything right, taken their medications as prescribed, have had good control of epilepsy over their entire life and still they develop it, which makes this so scary. >> thank you very much for explaining all of that to us