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1临床资料患者男性，40岁。半年前开始阵发性心悸伴头晕，每次持续5～15分钟。互个月前突然晕倒，意识丧失，测血压60／40mmHg（lmmHg—0．133kPa），心电图示室性心动过速，心室率220次／分，经同步电复律转为窦性心律，口服胺碘酮（amiodarone）每日0．2g。查体：血压115／75
1 Clinical data Patients Male, 40 years old. Six months ago, she started paroxysmal palpitations with dizziness, each lasting 5 to 15 minutes. Suddenly collapsed each month ago, loss of consciousness, blood pressure measurement 60/40mmHg (lmmHg-0.133kPa), ECG ventricular tachycardia, ventricular rate 220 beats / min, by synchronous cardioversion to sinus rhythm, oral Amiodarone 0.2 g per day. Physical examination: blood pressure 115/75