Table 1.

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