Canadian Cardiovascular Society Grading System for Stable Angina
Grade I stable angina develops upon strenuous, rapid, and/or prolonged exertion during work or recreation but is not induced by ordinary physical activity, such as walking and climbing stairs.
Grade II stable angina is characterized by a slight limitation of ordinary activity and is induced by the following:
Walking or climbing stairs rapidly
Walking or stair-climbing after meals
Walking more than two level blocks or climbing more than one flight of ordinary stairs at a normal pace and in normal conditions
During the few hours after waking
Grade III stable angina is characterized by marked limitation of ordinary physical activity. It is induced by walking one or two level blocks and climbing one flight of stairs in normal conditions and at a normal pace.
Grade IV stable angina is characterized by an inability to carry on any physical activity without discomfort. Anginal syndrome may be present at rest.