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Patient Characteristics
Values are number or mean ± standard deviation. LVEF: left ventricular ejection fraction, ACC: aortic cross clamp, CPB: cardiopulmonary bypass, MB: patients received 2 mg/kg of methylene blue was infused for 20 min before the start of CPB, Control: patients received equivalent amount of normal saline was infused at the same time. *P < 0.05 compared to the control group.
