Please assess the completion status of the following clinical trial:

Trial Title: Magnesium Infusion for Pain Relief After Thoracotomy. A Randomized Controlled Trial.

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

Eligibility Criteria:
Inclusion Criteria:~* Elective surgery~* Age 18-65 year~* ASA physical status 1-3~* Can use patient-controlled analgesia (PCA)~Exclusion Criteria:~* History of allergy to magnesium sulphate~* History of COPD, asthma or liver disease~* Serum creatinine \> 1.5 mg/dL~* History of CHF or atrioventricular conduction disturbance~* History of taking calcium channel blockers

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 65 Years
- Healthy Volunteers: f

Study Arms:
- Placebo (Type: PLACEBO_COMPARATOR): Normal saline IV
- Magnesium sulphate (Type: EXPERIMENTAL): Magnesium sulphate 50 mg/kg of magnesium sulphate infusion in 10 minutes before induction and then 15 mg/kg/hr until the end of the surgery.

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