A 20 year old man presented to the emergency department with palpitations lasting half an hour. He was also feeling dizzy and felt close to fainting. He denied any chest pain. He had no known cardiac history. Examination revealed blood pressure of 70/50 mm Hg. Oxygen saturation was 91% on room air. There was no murmur on auscultation of the chest. The man underwent electrocardiography (ECG) (fig 1⇓). What rhythm does the ECG show? Fig 1  Electrocardiography (ECG) on presentation to the emergency department Atrial fibrillation with very fast ventricular response as a result of antegrade conduction through an accessory pathway (pre-excited atrial …

中文翻译：

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一个年轻人，心and和晕厥前

一名20岁男子出现在心emergency处，持续了半个小时。他也感到头晕，几乎晕倒了。他否认有任何胸痛。他没有已知的心脏病史。检查显示血压为70/50 mm Hg。室内空气中的氧饱和度为91％。胸部听诊没有杂音。该名男子接受了心电图检查（图1⇓）。心电图显示什么节奏？图1向急诊科就诊的心电图（ECG）由于通过辅助途径的顺行性传导（心房预激，心房颤动，心房颤动，心室反应非常快）