Ontario score
| Anatomical equivalent | Stable angina | Unstable angina | ||||
|---|---|---|---|---|---|---|
| I or II | III | IV-A | IV-B | IV-C | ||
| Left main stenosis | 5.40 | 4.85 | 4.75 | 3.40 | 2.15 | |
| Multivessel disease including PLAD | 6.15 | 6.00 | 5.50 | 3.90 | 2.55 | |
| 3 vessel disease excluding PLAD | 6.45 | 6.35 | 5.80 | 3.90 | 2.65 | |
| 1 vessel disease including PLAD | 6.80 | 6.55 | 5.80 | 4.05 | 2.90 | |
| 1 or 2 vessel disease excluding PLAD | 6.95 | 6.65 | 6.15 | 4.15 | 3.05 | |
| Number to be subtracted if non-invasive test suggests high ischaemic risk | 0.90 | 0.75 | 0.75 | NA | NA | |
PLAD, proximal left anterior descending coronary artery. Adapted with permission from: Naylor CD, Baigrie RS, Goldman BS,et al. Assessment of priority for coronary revascularisation procedures.Lancet1990;335:1070–3. (Copyright by The Lancet Limited, 1990.)