ELECTROCARDIOGRAPHIC DIFFERENTIAL-DIAGNOS IS OF TACHYCARDIAS .1. TACHYCARDIAS WITH NARROW QRS COMPLEX

The possibility of curative therapy of certain supraventricular tachyc ardias with catheter ablation has increased the significance of the el ectrocardiographic differential diagnosis of tachycardias with a narro w QRS complex in the last few years. The careful analysis of the 12-le ad standard-ECG using the ECG criteria described in the present review leads to the correct diagnosis of 70-80% of all tachycardias with a n arrow QRS complex. The remaining 20-30% of tachycardias with a narrow QRS complex can, if necessary, further be differentiated with an elect rophysiologic study.