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14. Cơn đau thắt ngực , Chọn câu sai :a.​Nguyên nhân do xơ vữa động mạch vành , hay gặp ở người trên 40 tuổib.​Thường khởi phát sau một gắng sức , xúc độngc.​Cảm thấy đau ở sau xương ức hoặc ngực bên phảid.​Bệnh nhân cảm thấy giảm đau khi dùng nitrat

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