AF	Atrial Fibrillation
GI	Gastrointestinal
RCT	Randomized Controlled Trial
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
PICO	Population, Intervention, Comparator group and Outcomes
CI	Confidence Interval
OR	Odds Ratio
ICU	Intensive Care Unit
POAF	Postoperative Atrial Fibrillation
N/A	Not Applicable
Sd. Deviation	Standard Deviation
ICTRP	International Clinical Trials Registry Platform
CINAHL	Cumulative Index to Nursing and Allied Health Literature
MeSH	Medical Subject Headings
DOI	Digital Object Identifier
RevMan	Review Manager