Please assess the completion status of the following clinical trial:

Trial Title: Effect of Butorphanol Combined With Flurbiprofen Axetil on Preventing Hyperalgesia Induced by Remifentanil in Patients

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: DOUBLE
- Phase: None
- Number of Arms: 6.0

Eligibility Criteria:
Inclusion Criteria:~1. Subject is scheduled to undergo lower abdominal surgery under a short general anesthesia of less than 2 hours~2. Subject's American Society of Anesthesiologists physical status is I-II.~3. The subject's parent/legally authorized guardian has given written informed consent to participate.~Exclusion Criteria:~1. Subject has a diagnosis of renal or liver failure.~2. Subject has a diagnosis of Insulin dependent diabetes.~3. Subject is allergy and contraindication to butorphanol or NSAIDs.~4. Subject has a history of chronic pain, a history of alcohol or opioid abuse, pre-existing therapy with opioids, intake of any analgesic drug within 48 hours before surgery.~5. Subject has any contraindication for the use of patient-controlled analgesia (PCA).~6. Subject is pregnant or breast-feeding.~7. Subject is obese (body mass index \>30kg/m\^2).

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

Study Arms:
- Normal Saline (Type: PLACEBO_COMPARATOR): Normal saline is intravenously administrated before anesthesia induction and intraoperative pain management was with remifentanil
- Butorphanol (Type: ACTIVE_COMPARATOR): Butorphanol is intravenously administrated at a dose of 20μg/ kg before anesthesia induction and intraoperative pain management was with remifentanil
- Flurbiprofen axetilⅠ (Type: ACTIVE_COMPARATOR): Flurbiprofen axetil is intravenously administrated at a dose of 1.0mg/ kg before anesthesia induction and intraoperative pain management was with remifentanil
- Flurbiprofen axetilⅡ (Type: ACTIVE_COMPARATOR): Flurbiprofen axetil is intravenously administrated at a dose of 1.0mg/ kg before the skin closure and intraoperative pain management was with remifentanil
- Butorphanol-Flurbiprofen axetil (Type: ACTIVE_COMPARATOR): A dose of 10μg/ kg butorphanol and a dose of 0.5mg/ kg flurbiprofen axetil are intravenously administrated before anesthesia induction and intraoperative pain management was with remifentanil
- Sufentanil (Type: SHAM_COMPARATOR): Normal saline is intravenously administrated before anesthesia induction and intraoperative pain management was with sufentanil

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