Please assess the completion status of the following clinical trial:

Trial Title: The Effect of Dexamedetomidine for Interscalene Brachial Plexus Block on Plasma Biomarkers After Rotator Cuff Repair

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

Eligibility Criteria:
Inclusion Criteria:~1. a definite rotator cuff tear that needed repair seen on preoperative magnetic resonance imaging~2. acceptance of arthroscopic surgery including rotator cuff repair~3. age more than 20 years,~4. acceptance of preemptive regional block , PCA and blood sampling after 1 ,6, 12, 24, 48 hour postoperatively. .~Exclusion Criteria:~1. they did not undergo arthroscopic rotator cuff repair~2. they stopped PCA before 48 hours postoperatively because of associated side effects~3. there was a history of a previous shoulder operation or fracture~4. there was a concomitant neurologic disorder around the shoulder~5. refusal of blood sampling.

- Gender: ALL
- Minimum Age: 20 Years
- Maximum Age: None
- Healthy Volunteers: t

Study Arms:
- arm 1 (Type: ACTIVE_COMPARATOR): received ISB with 8mL of ropivacaine with 100 μg (1ml) of dexmedetomidine
- arm 2 (Type: PLACEBO_COMPARATOR): received ISB with 8mL of ropivacaine with 1ml of normal saline

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