Canadian Cardiovascular Society functional classification

Canadian Cardiovascular Society–functional classification severity of unstable angina

Class I

Usual physical activity, eg walking or climbing stairs, does not cause angina; angina is evoked by strenuous and/or rapid work or recreation

Class II

Slight limitation of ordinary activities, eg after walking 2 blocks, climbing one flight of steps, under normal circumstances, after meals, in the cold, wind, in the morning, or when under emotional stress

Class III

Marked limitation of ordinary activities, eg walking 1-2 blocks or climbing stairs under normal circumstances

Class IV

Inability to carry out any physical activity without discomfort–angina may be present at rest