Table 1.

Incidence of risk factors in the study population

Risk factor	No (%) of patients (n=8572)
Mean age at operation in years (range)	62.9 (31.3 to 88)
Female	1809 (21.1)
Angina class IV	1894 (22.1)
Myocardial infarction within 3 months	540 (6.3)
Respiratory disease	1603 (18.7)
Renal dysfunction	197 (2.3)
Peripheral vascular disease	1063 (12.4)
Cerebrovascular disease	703 (8.2)
Ejection fraction <30%	471 (5.5)
Intra-aortic balloon pump support	94 (1.1)
Ventilation support	9 (0.1)
Cardiogenic shock	43 (0.5)
Intravenous nitroglycerin	531 (6.2)
Urgent surgery	1706 (19.9)
Emergency surgery	146 (1.7)