1. A method of treating a patient having epilepsy comprising: coupling a first electrode and a second electrode to a vagus nerve of the patient, wherein said first electrode is coupled to a main trunk of a vagus nerve of the patient, and the second electrode is coupled to a cardiac branch of a vagus nerve of the patient, providing an electrical signal generator coupled to the first electrode and the second electrode, receiving at least one body data stream, analyzing the at least one body data stream using a seizure detection algorithm to determine whether or not the patient has had an epileptic seizure, applying a first electrical signal from the electrical signal generator to the main trunk of the vagus nerve using the first electrode as a cathode, based on a determination that the patient has not had an epileptic seizure, and applying a second electrical signal from the electrical signal generator to the cardiac branch of the vagus nerve using the second electrode as a cathode, based on a determination that the patient has had an epileptic seizure.