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 ...

Also, it is important to interpret the ECG in the context of the patient. If this was a healthy 20 year old, we would think SVT with aberrancy would be likely, however if systolic heart failure is ...