Please assess the completion status of the following clinical trial:

Trial Title: Effects of Dexmedetomidine on Cardiac Electrophysiology in Patients Under General Anesthesia During Perioperative Period

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: TRIPLE
- Phase: None
- Number of Arms: 4.0

Eligibility Criteria:
Inclusion Criteria:~* Ages ranged from 18 to 65~* ASA I\~II~* patients undergoing elective general anesthesia~* the surgery time for 1\~3 h~Exclusion Criteria:~* Preoperative ECG abnormalities, including QTc ≥440 ms (male), 460ms (female)~* abnormal cardiac conduction, prolonged QT syndrome~* heart disease history, such as pacemaker implantation, unstable angina, congestive heart failure, Heart valve disease~* antiarrhythmic drugs (β-receptor blockers, calcium channel blockers, tricyclic antidepressants, etc.) that can prolong the QT interval taken within one week before surgery~* coronary heart disease, non-sinus Heart rhythm, bradycardia, tachycardia, other arrhythmia, etc~* intraoperative HR≤45 beats/min and need drugs to increase heart rate~* previous allergy to dexmedetomidine~* preoperative electrolyte abnormalities~* emergency surgery, neurological or mental disorders , Liver and kidney dysfunction~* patients who use analgesic pumps after surgery~* refusal of patients

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

Study Arms:
- Loading dose with 0.5 μg/kg, maintenance dose with 0.5 μg/kg (Type: EXPERIMENTAL): 10 min before induction of anesthesia,the loading dose of dexmedetomidine is 0.5 μg/kg, and completed in 10 minutes. The maintenance dose is 0.5 μg/kg per hour during the operation until 0.5 h before the operation finished.
- Loading dose with 1 μg/kg, maintenance dose with 0.5 μg/kg (Type: EXPERIMENTAL): 10 min before induction of anesthesia,the loading dose of dexmedetomidine is 1 μg/kg, and completed in 10 minutes. The maintenance dose is 0.5 μg/kg per hour during the operation until 0.5 h before the surgery finished.
- Loading dose with 1 μg/kg, maintenance dose with 1 μg/kg (Type: EXPERIMENTAL): 10 min before induction of anesthesia,the loading dose of dexmedetomidine is 1 μg/kg, and completed in 10 minutes. The maintenance dose is 1 μg/kg per hour during the operation until 0.5 h before the surgery finished.
- Normal saline (Type: PLACEBO_COMPARATOR): None

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