1. A method for identifying an extreme seizure event in a patient, comprising: determining at least one of an autonomic index, a neurologic index, a metabolic index, an endocrine index, or a tissue stress index, said at least one determined index being based upon body data; identifying a seizure event based upon said at least one determined index; determining at least one seizure severity index (SSI) value indicative of the severity of said seizure event; comparing said determined at least one SSI value to at least one reference value; and identifying an occurrence of an extreme seizure event, based upon the comparison of said determined SSI value to said at least one reference value.