Please assess the completion status of the following clinical trial:

Trial Title: MPAACS: Magnesium for the Prevention of Atrial Arrhythmias After Cardiac Surgery

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: TRIPLE
- Phase: PHASE3
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~* patient undergoing coronary artery bypass surgery with or without valve procedure~* scheduled for on-pump or cardiopulmonary bypass protocol~Exclusion Criteria:~* existing atrial fibrillation/flutter in the past year or on antiarrhythmic medications~* ventricular fibrillation~* sustained ventricular tachycardia~* 2nd or 3rd degree heart block~* paroxysmal supraventricular tachycardia~* major aortic repair planned during open-heart procedure~* permanent atrial/ventricular pacemaker implanted~* dialysis dependent or creatinine clearance \< 35 umoles/min or oliguric/anuric renal failure~* patient intolerant of beta blockers~* patient has reactive airways disease dependent on regular beta-adrenergic agents~* patient is scheduled to undergo off-pump surgical protocol

- Gender: ALL
- Minimum Age: 20 Years
- Maximum Age: None
- Healthy Volunteers: f

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