Relationship of preoperative right ventricular (RV) dysfunction to postoperative survival. Groups are divided into those greater than the median of right ventricular function score of 4, and those ≤4 [95% confidence interval (CI) ≤4: 1151–1405, >4: 552–900]. The vertical line indicates 1 year, and after that there is a clear separation of both groups, though not before. Censoring the survival before 1 year results in a significant difference between these groups after 1 year (odds ratio 10.8).