- Clinical diagnosis of "Xueyu Zheng" (Blood Stasis Syndrome) as the scores of Chinese medicine symptoms scales of "Xueyu Zheng" in UA ≥ 15. The Chinese medicine symptoms scales of "Xueyu Zheng" is a 6-item questionnaire including the symtoms as following: (1)chest pain-10, (2)chest distress-10, (3) palpitation-5, (4)purple or dark lip-5, (5) purple or dark tongue-5, (6) unsmooth pulse-5.