Congestive heart failure 758 (32.6%) 89 (38.5%) .069 NYHA .064 I-II 492 (21.2%) 37 (16.0%) III-IV 1830 (78.8%) 184 (84.0%) Previous operation No injury (n 1/4 2324) Injury (n 1/4 231) P value CABG 1375 (59.2%) 162 (70.1%) .001 Aortic valve surgery 586 (25.2%) 57 ...