Please assess the completion status of the following clinical trial:

Trial Title: Dexmedetomidine Facilitate Analgesia

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

Eligibility Criteria:
Inclusion Criteria:~* aged from 18 to 80 years old~* American Association of anesthesiologists (ASA) grade Ⅱ \~ IV~* body mass index (BMI) 18.5-40~* planning undergoing peripheral nerve block~Exclusion Criteria:~* incomplete effect of nerve block~* Alzheimer's disease~* implanted cardiac pacemakers~* mental illness~* epilepsy~* autonomic nervous system diseases~* projected the duration of the operation was more than 3 hours

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 65 Years
- Healthy Volunteers: f

Study Arms:
- Group 1 (Type: EXPERIMENTAL): Dexmedetomidine group (Group DEX) was given 1.5ug/kg/h Dexmedetomidine continuous infusion Dexmedetomidine group (Group DEX)
- Group 2 (Type: ACTIVE_COMPARATOR): Midazolam group (Group MID) was continuously pumped with 0.05mg/kg/h midazolam

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