1. A medical device comprising: a cardiac data sensing module operable to sense cardiac data; a non-cardiac data sensing module operable to sense non-cardiac data; a value setting module operable to set: a first cardiac threshold value based upon sensed cardiac data from the cardiac data sensing module; and a first non-cardiac threshold value based upon sensed non-cardiac data from the non-cardiac data sensing module; a cardiac parameter detection module operable to determine a first cardiac parameter based upon sensed data from the cardiac sensing module; a non-cardiac parameter detection module operable to determine a first non-cardiac parameter based upon sensed data from the non-cardiac sensing module; an unstable brain state declaration module operable to declare a seizure when the first cardiac parameter exceeds the first cardiac threshold value or the first non-cardiac parameter exceeds the first non-cardiac threshold value.