The Differential Diagnosis Value Of The Ratio Of Initial Excite Velocity To Terminal Excite Velocity (Vi/Vt) In Surface ECG For Wide QRS Complex Tachycardia

Objective: To explore an identified diagnosis value of the ratio of initial excite velocity to terminal excite velocity (Vi/Vt) for wide QRS complex tachycardia.Method: To select tachycardic patients who experienced heart attacks before or during hospitalization and a heart rate of more than 100 beats per minute, and the period of QRS not less than 0.12 of a second. To analyze retrospectively 12-lead surface ECG morphology characteristics. If Vi/Vt is less than 1, the ECG is diagnosed as VT. If the Vi/Vt is 1 or greater ,the ECG may also be diagnosed as PSVT.Result: 56 patients with wide QRS tachycardia were diagnosed with electric physiological examinations. 31 of these patients were diagnosed as SVT. 25 of these SVT patients had ECG with a Vi/Vt of more than 1.6 of these SVT patients had ECG with a Vi/Vt of 1 or less.The accuracy here being 81%. The other 25 of these 56 patients were diagnosed as VT. 4 of these VT patients had ECG with a VI/Vt of more than 1, 21 of these VT patients had ECG with a Vi/Vt of 1 or less. The accuracy here being 84%.Conclusion: The ratio of initial excite velocity to terminal excite velocity (Vi/Vt) in surface ECG for wide QRS complex tachyardia has important significance in clinical use for the differential diagnosis of tachycardia. Therefore, it is worth popularization.