Please assess the completion status of the following clinical trial:

Trial Title: Preoperative Oral Magnesium to Prevent Postoperative Atrial Fibrillation Following Coronary Surgery (POMAF-CS)

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

Eligibility Criteria:
Inclusion Criteria:~* Adult patients~* Coronary artery disease~* Planned coronary artery surgery~* signed informed consent~Exclusion Criteria:~* Preoperative supraventricular dysrhythmia including atrial fibrillation, either acute or chronic~* Left ventricular EF \< 30%~* Urgent surgery~* Redo surgery~* Permanent preoperative pacemaker~* Preoperative anti arrythmia drugs classes I and III~* Post operative inotrope drugs~* Postoperative bradycardia necessitating electrosystolic pacing~* Preoperative heart rate less than 50 bpm~* documented preoperative dysthryroidism~* 2nd and 3rd degree atrioventricular bloc~* Renal failure with GFR \< 30 ml/min/1.73 m²

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 100 Years
- Healthy Volunteers: f

Study Arms:
- Preoperative oral Magnesium (Type: EXPERIMENTAL): Magnesium sulfate 8 tablets (8 x 0.4 g) per day, PO, for the 3 days preceding the surgical intervention
- Control (Type: PLACEBO_COMPARATOR): Placebo oral tablet, for Magnesium Sulfate tablets, PO, for the 3 days preceding the surgical intervention

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