Any tachycardic rhythm with a left or right bundle branch block that is NOT ventricular tachycardia is considered "supraventricular tachycardia with aberrancy". This would even include sinus ...

This ECG has a narrow QRS complex initally ... the origin of the rhythm with the options being ventricular tachycardia or supraventricular tachycardia (SVT) with aberrancy (left bundle).

The following factors can raise your risk of SVT episodes: A problem with your heart's electrical system can also lead to ventricular tachycardia. In contrast to SVT, this type of tachycardia ...