Table 1. CCS Grading Of Angina Effort.

Functional effort associated with angina class
I	Ordinary physical activity does not cause angina, such as walking or climbing stairs. Angina with strenuous or prolonged exertion at work or recreation.
II	Slight limitations of ordinary physical activity. Walking or climbing stairs rapidly. Walking uphill, walking or climbing stairs after meals, or in cold or wind, or under emotional stress, or only during the few hours after wakening. Walking more than two blocks on the level and climbing more than one flight of ordinary stairs at a normal pace and in normal conditions.
III	Marked limitation of ordinary physical activity. Walking one to two blocks on the level and climbing more than one flight in normal conditions.
IV	Inability to carry on any physical activity without discomfort. Anginal syndrome may be present at rest.