Registry of Subjects With Drug Resistant Epilepsy and Treated With the VNS Therapy System.

Inclusion Criteria

• •Clinical diagnosis of drug resistant epilepsy treated with VNS Therapy. Eligible subjects include those not previously treated with VNS Therapy as well as subjects receiving replacement generators.
• •Able and willing to comply with the frequency of study visits.
• •Subject, or legal guardian, understands study procedures and voluntarily signs an informed consent in accordance with institutional policies. In the event that the subject is under the age of 18, the subject may also be required (per EC/IRB) to sign an assent affirming their agreement to participate.