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将食道心房调搏诱发的阵发性室上性心动过速(PSVT)17例分为Ⅰ(WPW,左侧旁道)、Ⅱ(双径)和Ⅲ(既无WPW也无双径,且在调搏时亦不出现预激图形)共3组。并同步记录V_1、V_E导联。结果发现:房室结双径折返的PSVT特征是V_E近、远端图形颠倒,A峰或超前、或滞后或重叠于P~-峰,两峰相距很近,A峰与P~-峰的间距≤40ms。如房波与QRS重合更是重要的特征。左侧旁道参与折返的PSVT,其A峰-P~-峰≥55ms,V_E近、远端图形颠倒,远端A峰依次超前于近端A峰及P~-峰。如果窦律时及心房调搏时均不出现预激图形,可据此诊断为左侧隐匿性旁道。
17 cases of paroxysmal supraventricular tachycardia (PSVT) induced by esophageal atrial pacing were divided into Ⅰ (WPW, left bypass), Ⅱ (double) and Ⅲ (neither WPW nor dual diameter Pacing does not appear when the pre-excited graphics) a total of 3 groups. And record V_1, V_E lead synchronously. The results showed that: the characteristics of PSVT of AVNR were VE, the distal end was reversed, A peak or advanced, or lagging or overlapping with P ~ - peak, the two peaks were very close and the A peak and P ~ - peak Pitch ≤40ms. Such as atrial and QRS coincidence is an important feature. The PSVT of the left accessory pathways involved in the reentry, the A peak-P ~ - peak ≥55ms, V_E near, far-end graphics reversed, distal A peak followed by the proximal A peak and P ~ - peak. If the sinus rhythm and atrial pacing when no pre-excitation graphics, which can be diagnosed on the left side of the occult bypass.