Please assess the completion status of the following clinical trial:

Trial Title: the Effect of Dexmedetomidine in Coracoid Approach Brachial Plexus Block

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~1. American Society of Anesthesiologists (ASA) physical status I or II;~2. Aged 18-60 years;~3. The elbow, forearm, wrist or hand surgery~Exclusion Criteria:~1. History of allergy to local anesthetics;~2. Coagulation dysfunction, neuromuscular disease or local infection;~3. The operation time is longer than the local anesthetics effective time.

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

Study Arms:
- Group Control (Type: EXPERIMENTAL): 40 ml 0.375% ropivacaine was injected after Locating brachial plexus.
- Group Dexmedetomidine (Type: EXPERIMENTAL): 40 ml 0.375% ropivacaine mixed with dexmedetomidine was injected after Locating brachial plexus.

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