Evaluation of Indirect Measurement of Respiratory Quotient in Non-cardiac Major Surgery (The BAR Study)

Indirect measurement of RQ was performed by anesthesia ventilator and compared to marker of anaerobic metabolism (arterial lactate, venoarterial PCO2 gradient, venoarterial PCO2 gradient/ arteriovenous O2 content difference, ScVO2) at different time of the srugery (every hours). In post-operative time, complications and hospital's length of stay were recorded.