Please assess the completion status of the following clinical trial:

Trial Title: Comparison of Butorphanol and Tramadol Associated Patient-Controlled Analgesia (PCA) After Hysterectomy

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE4
- Number of Arms: 4.0

Eligibility Criteria:
Inclusion Criteria:~* ASA physical status I-II~* Chinese~* 19-64yr~* Uterus myoma~Exclusion Criteria:~* Allergy to opioids, a history of the use of centrally-acting drugs of any sort, chronic pain and psychiatric diseases records.~* Participants younger than 18yr，older than 65yr or pregnancy was eliminated.~* Due to the significant changes in vital signs might affect cognition of pain and that of sensation, over 20% variation of these records from the baselines or below 92% of SpO2 under 20-40% nasal tube oxygen at any time should be excluded from the study.~* Those who were not willing to or could not finish the whole study at any time.~* Any patient who exhibited a combative or incoherent state of PCA analgesia would be excluded from the study.~* Allergy to local anesthetics.~* Failed to perform the epidural catheterization.~* Those who demonstrated significant nerve-associated side effects from the insertion of the epidural needle.

- Gender: FEMALE
- Minimum Age: 19 Years
- Maximum Age: 64 Years
- Healthy Volunteers: f

Study Arms:
- 1 (Type: EXPERIMENTAL): Butorphanol basal infusion adjunct to morphine PCA
- 2 (Type: EXPERIMENTAL): Saline infusion adjunct to morphine PCA
- 3 (Type: EXPERIMENTAL): Premedication of Tramadol
- 4 (Type: EXPERIMENTAL): Preemptive saline for morphine PCA

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