Test positivity criteria used for each non-invasive preoperative test
| Non-invasive test | Positivity criterion |
|---|---|
| Ambulatory ECG | ST segment depression of ⩾1 mm or ST elevation ⩾2 mm after J point (measured at 60 ms) lasting at least one minute |
| Exercise ECG | Development of exercise induced horizontal or downsloping ST depression of 1 mm or more |
| Radionuclide ventriculography | Ejection fraction ⩽35% |
| Myocardial perfusion scintigraphy | One or more fixed or reversible thallium-201 myocardial defects |
| Dipyridamole stress echocardiography | New or worsening ventricular wall motion abnormalities |
| Dobutamine stress echocardiography | New or worsening ventricular wall motion abnormalities |