Results
Pulmonary function tests were normal or mildly reduced in 190 patients (group 1) and moderately to severely reduced in 176 patients (group 2). Propensity matching identified 111 matched pairs in each group with balanced preoperative and operative characteristics. Compared to group 1, Group 2 had longer duration of mechanical ventilation [12 (7.5- 16) vs. 9 (6.5- 13) hours, p<0.001], higher postoperative Creatinine [111 (90- 142) vs. 105 (81- 128) µmol/dl, p=0.02] and higher hospital mortality (6.31% vs 0%, p=0.02).