Please assess the completion status of the following clinical trial:

Trial Title: The Neuroprotective Effects of Dexmedetomidine During Brain Surgery

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

Eligibility Criteria:
Inclusion Criteria:~* Patients undergoing elective craniotomy for supratentorial brain tumor resection or cerebral vascular surgery~* age between 20 to 80 yr~Exclusion Criteria:~* Fever, elevated white blood cell or C-reactive protein~* Impaired liver function, eg. AST or ALT \>100; liver cirrhosis \> Child B class~* Impaired renal function, cGFR\< 60 ml/min/1.73 m2~* Cardiac dysfunction, such as heart failure \> NYHA class II

- Gender: ALL
- Minimum Age: 20 Years
- Maximum Age: 80 Years
- Healthy Volunteers: f

Study Arms:
- DEX (Type: EXPERIMENTAL): Intraoperative intravenous infusion of dexmedetomidine
- Control (Type: PLACEBO_COMPARATOR): Intraoperative intravenous infusion of 0.9% saline

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