Please assess the completion status of the following clinical trial:

Trial Title: Comparing Safety and Efficacy of Dexmedetomidine and Propofol

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Patient is 3 - 11 years~* Patient is scheduled for MRI at Children's Hospital Boston.~* Patient meets criteria to receive either dexmedetomidine or propofol sedation~* Patient's guardian provides written consent~Exclusion Criteria:~* Patient does not meet established sedation criteria~* Patient has history of allergy, intolerance, or reaction to dexmedetomidine or propofol or hypersensitivity~* Patient has current, repaired, or risk for Moya-Moya disease~* Patient has had a stroke within the past six months~* Patient has uncontrolled hypertension~* Patient currently uses beta antagonist, alpha 2 agonist or calcium blocker~* Known soy, Lecithin, or egg allergy

- Gender: ALL
- Minimum Age: 3 Years
- Maximum Age: 11 Years
- Healthy Volunteers: f

Study Arms:
- Dexmedetomidine Group (Type: ACTIVE_COMPARATOR): Dexmedetomidine given as 2mcg/kg bolus over 10 minutes followed by 1.5mcg/kg/hr infusion for duration of scan. The bolus may be repeated up to 2 times at any time during the sedation in the event that adequate sedation conditions (minimum Ramsay Sedation Score of 4) are not achieved. In the event that dexmedetomidine is unable to achieve motionless conditions, after a total of 3 boluses, 0.5 mg/kg IV pentobarbital may be administered at q1 minute intervals up to a maximum of 2 mg/kg, per established protocol.
- Propofol Group (Type: ACTIVE_COMPARATOR): Propofol bolus at an initial dose of 1 mg/kg over 1 minute then up to two additional 1 mg/kg boluses may be administered (total 3 mg/kg) - each over a one (1) minute interval, waiting 30 seconds after completion of each bolus to reassess sedation level. Once a minimum Ramsey Sedation Score 4 is achieved, an infusion at 125 mcg/kg/min is initiated. It may be titrated to 300 mcg/kg/min. If there is movement or awakening the patient may be rebolused with no more than 2 doses of Propofol at 1 mg/kg over 1 minute, in the same dosing manner as described above, waiting 30 seconds between doses. If adequate sedation is not achieved, 0.5 mg/kg IV pentobarbital may be administered at q1 minute intervals up to a maximum of 2 mg/kg.

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