患者，男，60岁，十余天前突然出现心前区剧烈疼痛，状若刀绞，痛时面色苍白，四肢发凉出冷汗，数分钟后缓解。以后反复发作，日为2?3次，受寒易发，但疼痛较轻，含化硝酸甘油后很快缓解。现病人四肢欠温，胸闷，苔薄白，脉沉细。治法为

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