Please assess the completion status of the following clinical trial:

Trial Title: Supplementation With Polyphenol-Rich Foods and Atrial Fibrillation After a Cardiac Surgery

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

Eligibility Criteria:
Inclusion Criteria:~* presence of sinus rhythm on the screening electrocardiogram~* first-time elective open heart surgery~Exclusion Criteria:~* absence of sinus rhythm at screening~* known allergy or intolerance to gluten or anthocyanin compound~* regularly consuming of anthocyanin or antioxidant supplements,~* being currently pregnant,~* existing or planned cardiac transplant or use of ventricular assist device,~* being unable or unwilling to provide informed consent,~* history of hepatic or renal disease,~* history of cancer history of substance abuse

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Placebo (Type: PLACEBO_COMPARATOR): Soluble corn flour not rich in anthocyanins
- High-anthocyanin rich corn flour (Type: ACTIVE_COMPARATOR): Soluble corn flour at high content in anthocyanins

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