Non-eligible patients
| n | % | |
| All procedures during study period | 2131 | |
| Not included because of: | ||
| Unstable angina Braunwald class III | 635 | 29.8 |
| Acute myocardial infarction | 245 | 11.5 |
| Intra-aortic balloon pump support | 22 | 1.0 |
| General anaesthesia | 8 | 0.4 |
| Miscellaneous | 206 | 9.7 |
| Included | 1015 | 47.6 |