Please assess the completion status of the following clinical trial:

Trial Title: The Effect of Dexmedetomidine on Prevention of Postoperative Acute Kidney Injury in Patients Undergoing Aortic Surgery

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

Eligibility Criteria:
Inclusion Criteria:~1. the patients undergoing ascending, arch and/or proximal descending aorta surgery with cardiopulmonary bypass~2. 20 - 100 yrs old~Exclusion Criteria:~1. having preoperative severe renal dysfunction (eGFR \< 15 ml/min per 1.73m2)~2. Left ventricular-ejection fraction \< 30%~3. Preexisting congestive heart failure~4. Severe coronary artery disease~5. Hemodynamically unstable arrhythmia~6. Cardiogenic shock during perioperative period~7. Ventricular assist device use~8. cannot communication because of a language barrier or illiteracy

- Gender: ALL
- Minimum Age: 20 Years
- Maximum Age: 100 Years
- Healthy Volunteers: f

Study Arms:
- dexmedetomidine (Type: EXPERIMENTAL): dexmedetomidine, 0.4 mcg/kg/h, IV, The infusion of study drug is started after anesthesia induction and continued until 24 hours after surgery.
- control (Type: PLACEBO_COMPARATOR): saline, same infusion rate (received equal volume of normal saline), IV, The infusion of study drug is started after anesthesia induction and continued until 24 hours after surgery.

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