This is a prospective, unblinded, non-randomized, descriptive study designed to collect ECG data.

This is a prospective, unblinded, non-randomized, descriptive study designed to collect ECG data and determine the process for proper generator and lead placement. The study will be conducted in two phases: Phase I includes ECG data collection from human subjects; Phase II, the Implant Instructions for Use will be evaluated by Cyberonics' Clinical Engineers based on the activities of five to eight experienced VNS surgeons.

Inclusion Criteria:

1. At least 12 years old and in general good health for Phase I. At least 18 years old and in general good health for Phase II.
2. Patients or their guardians must be willing to provide signed informed consent/assent and HIPAA authorization. Note: Patients diagnosed with epilepsy and taking at least 1 antiepileptic medication are desired but not required for the study.

Exclusion Criteria:

1. History of pathologically significant cardiac arrhythmias including but not limited to atrial fibrillation or flutter, chronotropic incompetence, supraventricular tachycardia, ventricular flutter or fibrillation, or implantation of a permanent cardiac pacemaker or defibrillator.
2. Currently present existing signs of skin irritation or rash on the left neck or upper left chest as determined by the PI.
3. History of physical adverse reaction to adhesive electrodes.

Subjects 12 years and older in general good health, preferably with epilepsy and on at least 1 antiepileptic medication.