Please assess the completion status of the following clinical trial:

Trial Title: Para-vertebral Dexmedetomidine and the Incidence of Postoperative Chronic Pain

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: DOUBLE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* ASA II-III~* Adult~* Video-assisted thoracic surgery~Exclusion Criteria:~* Patient refusal~* Allergy to medication~* Coagulopathy~* Malformation

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 60 Years
- Healthy Volunteers: f

Study Arms:
- Dexmedetomidine (Type: ACTIVE_COMPARATOR): Dexmedetomidine is added to bupivacaine the paravertebral block
- Bupivacaine (Type: OTHER): Bupivacaine only in the paravertebral block

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