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患者男性,18岁,患先天性后乏氏(Valsalva)窦(非冠状窦)动脉瘤。反复发作室上性心动过速8年,心动过速未发作时,窦性心律(75—95次/分)和心率相同或略慢的异位左房心律交替。超声心动图示左心室显著肥厚和扩大。窦性心律的特征:1.P 波电轴正常。2.P-R 间期0.16″。3.QRS 波电轴约+70°。4.初始20ms 向量向左上,使Ⅰ、
Male patient, 18 years old, with Valsalva sinus (non-coronary sinus) aneurysm. Recurrent supraventricular tachycardia for 8 years, tachycardia without seizures, sinus rhythm (75-95 beats / min) and heart rate the same or slightly ectopic left atrial rhythm alternation. Echocardiography showed significant left ventricular hypertrophy and enlargement. Sinus rhythm characteristics: 1.P wave axis normal. 2.P-R interval 0.16 ".3.QRS wave axis about +70 ° .4. The initial 20ms vector to the left, so I,