Please assess the completion status of the following clinical trial:

Trial Title: Intranasal Dexmedetomidine Premedication

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:~* Surgery:The laryngoscope vocal polyp excision~* Aged 18 to 60 years old~* Body mass index (BMI) \< 30 kg/m2~* American society of Anesthesiologist (ASA) I -II~Exclusion Criteria:~* The investigator refused to participate~* Known allergy or hypersensitive reaction to dexmedetomidine or anesthetic~* With previous history of heart disease~* Pregnant women; no reliable contraceptive measures in postmenopausal women~* Preoperative heart rate less than 45bpm; Ⅱ or Ⅲ degree atrioventricular block; ischemic heart disease~* Taking antihypertensive drugs such as methyldopa, clonidine and other α2 receptor agonist~* Asthma~* Sleep apnea syndrome~* Liver and kidney dysfunction~* Known to suffer from mental illness~* Long-term use of sedatives and analgesics in patients

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 60 Years
- Healthy Volunteers: f

Study Arms:
- dexmedetomidine (Type: ACTIVE_COMPARATOR): intranasal dexmedetomidine
- placebo (Type: PLACEBO_COMPARATOR): intranasal saline

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