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Intraoperative real-time monitoring of ethylene measured in patients undergoing cardiac surgery with cardiopulmonary bypass (CPB). Sampling line was positioned in the expiratory limb of the ventilator circuit prior to and at the end of CPB and following CPB and to the exhaust of the oxygenator of CPB machine during CPB. Box plots represent 3–5 min ethylene averages. *P < 0.05 compared with patient baseline for ventilated groups. #P < 0.05 among CPB groups.
