Please assess the completion status of the following clinical trial:

Trial Title: Dexmedetomidine Combined With Hydromorphone in Tonsillectomy and Adenoidectomy

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

Eligibility Criteria:
Inclusion Criteria:~* experienced tonsillectomy and adenoidectomy~* ASA physical status I-II~* weight 12-30 kg~Exclusion Criteria:~* respiratory disease~* circulatory or nervous system disease~* hepatic dysfunction~* known adverse reactions to hydromophine and dexmedetomidine

- Gender: ALL
- Minimum Age: 3 Years
- Maximum Age: 10 Years
- Healthy Volunteers: t

Study Arms:
- group A (Type: EXPERIMENTAL): Dexmedetomidine(0.5 μg／kg)/hydromophine-based general anesthesia
- group B (Type: EXPERIMENTAL): Dexmedetomidine(1μg／kg)/hydromophine-based general anesthesia

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