Quercetin in Coronary Artery By-pass Surgery

Inclusion Criteria: * to be able to speak French or English; * to be able to give free and enlighten consent; * be hospitalized and waiting for a cardiac surgery of revascularization; * to have had a myocardial infarction (MI) within the past 30 days or to be in a state of stable angina before the surgery. Exclusion Criteria: * to be in a stable state without MI in the last 30 days; * have a cardiac surgery concomitant to the cardiac surgery of revascularization; * have an infection in the last 30 days; * to have renal insufficiency (GFR less than 30); * to have a liver disease (AST, ALT or bilirubin ˃ 2X normal values); * to have a known cirrhosis; * to have a past history of breast cancer or other tumors estrogen-dependent; * to be intolerant to flavonoids, niacine or ascorbic acid; * take quinolone; * need for a quinolone during post-op; * not being able to give a free and enlighten consent; * not being able to speak French of English; * take quercetin as a supplement.