阵发性房性心动过速(下称房速)和交界性心动过速(下称交界速)在心电图上有时难以区分,故统称为阵发性室上性心动过速(下称室上速)。近十年来,由于临床心电图的研究进展,就有可能确定大多数室上速的起源部位及其发生机理,从而予以更合理的处理。本文旨在讨论体表心电图诊断该心律失常的新线索。一、室上速对刺激迷走神经的反应 Paroxysmal atrial tachycardia (hereinafter referred to as atrial tachycardia) and borderline tachycardia (hereinafter referred to as the junctional speed) is sometimes difficult to distinguish on the ECG, it is collectively referred to as paroxysmal supraventricular tachycardia speed). In recent ten years, due to the progress of clinical electrocardiogram, it is possible to determine most of the origin of supraventricular tachycardia and its mechanism of occurrence, so as to be more reasonable treatment. This article aims to discuss the new cue of body surface electrocardiography in the diagnosis of arrhythmia. First, the room speed stimulation of the vagus nerve response