Table 2.

Cardiac risk stratification

Low risk	Moderate risk	High risk
Absence of angina or other symptoms (eg, unusual shortness of breath, mild headache or dizziness). Functional capacity >7 METs, left ventricular ejection fraction (LVEF) ≥50%. Absence of arrhythmia at rest. Absence of depression.	Presence of angina or other symptoms (eg, unusual shortness of breath, mild headache or dizziness, dizziness occurring at high levels of exercise ≥7 METs). Mild to moderate silent ischaemia (ST eruption <2 mm). Functional capacity >5 METs. LVEF=40%–49%.	Presence of arrhythmias. Presence of angina or other symptoms (eg, unusual breathlessness, mild headache or dizziness, dizziness occurring at high levels of exercise <5 METs). Silent ischaemia (ST stroke ≥2 mm). Presence of abnormal haemodynamics during exercise (reduction of BP) or postexercise hypotension. LVEF<40%.

BP, blood pressure; METs, metabolic equivalents.