Chinese Herbal Formula Xuefu Zhuyu for Stable Angina (CheruSA): Study Protocol for a Multicenter Randomized Controlled Trial

Table 2

Grading of angina of effort by the Canadian Cardiovascular Society.

I	Ordinary activity, such as walking and ascending stairs, does not cause angina; angina with strenuous or rapid or prolonged exertion at work or recreation
II	Slight limitation of ordinary activity; angina walking or ascending stairs rapidly, walking or ascending stairs after meals, or in the cold, wind or under emotional stress, or only during the first few hours awake, walking more than 200 m on level ground or ascending more than one flight of ordinary stairs at a normal pace under normal conditions
III	Marked limitations in ordinary physical activity; angina when walking 100–200 m on level ground or one flight of stairs under normal conditions and at a normal pace
IV	Inability to partake in any physical activity without discomfort—angina syndrome may be present at rest