Please assess the completion status of the following clinical trial:

Trial Title: Treatment-Resistant Depression Registry

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: None
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~* Patient diagnosed with a current major depressive episode according to DSM-IV-TR criteria.~* For D-21 patients only who have completed the D-21 dosing Study without any D-21 inclusion and exclusion protocol deviation.~* Patient has been in the current depressive episode for 2 years or longer, or has had at least 3 lifetime episodes including the current MDE.~* Patient has had an inadequate response to 4 or more adequate antidepressive treatments.~* The patient has a CGI severity of illness score of moderately ill (score of 4) or greater.~* The patient must be able to provide informed consent and complete all forms.~Exclusion Criteria:~* Patient has a history of schizophrenia, schizoaffective disorder, any other psychotic disorder, or a current major depressive episode that includes psychotic features; or is currently psychotic.~* Patient is currently enrolled in a double blind investigational study; patients who have completed the double-blind D-21 study will be allowed to enter the Registry for Long Term Follow-up~* Other than those patients who were enrolled in the D-21 study, patient has previously received VNS therapy.~* Patient has a history of rapid cycling bipolar disorder.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- 1. 500 VNS Patients (Type: None): VNS Patients - Treatment-resistant depression patients treated with VNS Therapy.
- 2. 300 Non-VNS Patients (Type: None): Non-VNS Patients - Treatment-resistant depression patients not receiving VNS Therapy.

Based on this trial design, predict the completion outcome and termination type (if applicable).