Please assess the completion status of the following clinical trial:

Trial Title: Effect of Dexmedetomidine After Thyroidectomy

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:~* Female patient,~* Aged 20-60 yr,~* ASA physical status 1-2,~* Patients undergoing elective thyroidectomy under general anesthesia~Exclusion Criteria:~* Sighs of difficult airway,~* History of respiratory disease or chronic cough,~* Cardiovascular disease,~* Pregnant or breast-feeding woman

- Gender: FEMALE
- Minimum Age: 20 Years
- Maximum Age: 60 Years
- Healthy Volunteers: f

Study Arms:
- Dexmedetomidine (Group D) (Type: EXPERIMENTAL): After induction of anesthesia, anesthesia is maintained with desflurane and remifentanil during thyroidectomy.~Fifteen minutes before the end of surgery, infusion of remifentanil for surgery is discontinued.~Then, dexmedetomidine has started infusion for 15 min (rate of 0.6 ug/kg/hr). Vital signs and complications of testing drugs are measured before and after infusion of testing drugs.~Five minutes before the end of surgery, anesthetic gas (desflurane) is discontinued.~After patient has awake, extubation has done. Extubation time and Recovery time,Cough reflex,Ramsay Sedation Scale, Visual analogue scale, and surgical outcomes such as postoperative bleeding, time to remove drainage and duration of hospital staying, postoperative complications are measured until POD#3.
- Normal Saline (Group N) (Type: PLACEBO_COMPARATOR): After induction of anesthesia, anesthesia is maintained with desflurane and remifentanil during thyroidectomy.~Fifteen minutes before the end of surgery, infusion of remifentanil for surgery is discontinued. Then, normal saline has started infusion for 15 min (same rate as Group D). Vital signs and complications of testing drugs are measured before and after infusion of testing drugs.~Five minutes before the end of surgery, anesthetic gas (desflurane) is discontinued.~After patient has awake, extubation has done. Extubation time and Recovery time,Cough reflex,Ramsay Sedation Scale, Visual analogue scale, and surgical outcomes such as postoperative bleeding, time to remove drainage duration of hospital staying, postoperative complications are measured until POD#3.

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