冠心病是常见的心脏病之一，患者一般集中于中老年人，不同严重程度不一的患者，在病发的时候会出现不同程度的心绞痛。Ⅰ级：症状较轻，日常活动无心绞痛发作。Ⅱ级：症状明显，日常活动因心绞痛而轻度受限。Ⅲ级：症状显著，日常活动因心绞痛发作而明显受限。Ⅳ级：症状严重，不适宜做任何体力活动，均可导致心绞痛发作。
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