Abstract：
A four-year-old Labrador Retriever was presented for intermittent tachycardia. The electrocardiogram showed sinus rhythm conducted with ventricular pre-excitation and short runs of orthodromic atrioventricular reciprocating tachycardia. Four months later, the rhythm degenerated into a symptomatic sustained tachycardia, suspected to be pre-excited atrial fibrillation, a potentially life-threatening rhythm in the presence of an accessory pathway with a short refractory period. Two days after initiating oral diltiazem, the dog deteriorated and represented with sustained orthodromic atrioventricular reciprocating tachycardia, which was terminated by a precordial chest thump. It proceeded to sinus rhythm with ventricular pre-excitation followed by an episode of pre-excited focal atrial tachycardia. A bolus of lidocaine IV successfully restored sinus rhythm and sotalol treatment was started. The dog clinically recovered but died spontaneously 24 h later. This is the first case report that describes spontaneous pre-excited focal atrial tachycardia.
摘要：
一名4岁的拉布拉多寻回犬因间歇性心动过速而出现。心电图显示窦性心律，伴有心室预激和短促房室性房室往复式心动过速。四个月后,节律退化为有症状的持续性心动过速，怀疑是预激心房颤动,在存在具有短不应期的辅助途径的情况下，可能危及生命的节律。开始口服地尔硫两天后，狗恶化并表现为持续的直行房室往复式心动过速，以心前区胸部重击终止。它在心室预激的情况下开始窦性心律，然后是预激的局灶性房性心动过速。利多卡因IV推注成功恢复了窦性心律，并开始了索他洛尔治疗。狗临床康复，但24小时后自发死亡。这是第一例描述自发性预激局灶性房性心动过速的病例报告。
