患者，男，35岁。患脱疽2年，目前左小腿足趾 紫红，下垂时更甚，抬高则见苍白，足背毫毛脱 落，皮肤、肌肉萎缩，趾甲变厚，趺阳脉搏动消 失，患肢持久性静止痛，尤以夜间较甚，舌紫暗 苔薄白，脉沉细。治疗应首选

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