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患者男,55岁。因反复心悸3年,伴胸闷3月就诊。其心悸呈发作性,突发突止;心率最快170次/分,最慢40次/分。半年前曾检查超声心动图及二阶梯运动试验均正常。体格检查除心率45次/分外,余无其它阳性体征。试验前患者一般情况好,血压14.1/9.33kPa;心电图示窦性心动过缓(47次/分),ST段正常。按常规静脉注射阿托品2mg,即刻心电图示阵发性室上性心动过速,ST段:Ⅱ、Ⅲ、avF水平下移0.1～0.2mv, V_4～V_6水平下移0.3～0.4mv;病人主诉心悸、胸闷,呈
Male patient, 55 years old. Due to repeated palpitations 3 years, with chest tightness in March treatment. The heart palpitations were episodic, sudden stop; the fastest heart rate 170 beats / min, the slowest 40 beats / min. Echocardiography and two-step exercise tests were normal six months ago. Physical examination in addition to heart rate 45 times / min, I no other positive signs. Before the test, patients generally had good blood pressure 14.1 / 9.33kPa; ECG showed sinus bradycardia (47 beats / min), ST-segment normal. According to conventional intravenous injection of atropine 2mg, immediate ECG showed paroxysmal supraventricular tachycardia, ST segment: Ⅱ, Ⅲ, avF level down 0.1 ~ 0.2mv, V_4 ~ V_6 level down 0.3 ~ 0.4mv; patients complained of heart palpitations , Chest tightness, was