The question addressed in this review is whether supplementation with thyroid 
hormones during the perioperative period improves the outcome of patients 
undergoing coronary artery bypass surgery. Altogether 88 relevant papers were 
identified using the below mentioned search, seven papers represented the best 
evidence to answer the question. The author, journal, date and country of 
publication, patient group studied, study type, relevant outcomes, results, and 
study weaknesses were tabulated. We conclude that although widespread interest 
has been shown on the use of thyroid hormones in the perioperative period, and 
the effect of cardiopulmonary bypass on thyroid hormone metabolism widely 
studied, there is no substantial evidence to justify routine use of thyroid 
hormones in patients undergoing coronary artery bypass grafting.