Study outcomes
postoperative arrhythmia
The primary outcome was a composite of 30-day mortality, ICU stay of more than 5 days, and postoperative arrhythmia occurring within 48 h of surgery and requiring intervention.Secondary endpoints were the length of stay (days), length of mechanical ventilation (days), myocardial biomarkers (troponin) measured (preoperatively, 6 h, 24 h, 48 h postoperatively), ventricular function assessed by fractional shortening and ejection fraction, extracorporeal membrane oxygenation support (ECMO) and vasoactive inotropic score [dopamine dose (μg/kg/min) + dobutamine dose (μg/kg/min) + 100