The investigators will recruit and randomize 200 elective cardiac surgery patients to receive physiologic oxygenation (normoxia) or hyper-oxygenation (hyperoxia) during surgery to test the hypothesis that intraoperative physiologic oxygenation decreases the generation of reactive oxygen species, oxidative damage, and postoperative organ injury compared to hyper-oxygenation.
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Intraoperative Systemic Oxidative Damage
Timeframe: separation from cardiopulmonary bypass or completion of off-pump coronary artery bypass grafting (approximately 3-5 hours into surgery and intervention)
Acute Kidney Injury
Timeframe: baseline to postoperative day 2