|SVT with pre-existing bundle-branch block or intraventricular conduction defect|
|SVT with aberrant conduction due to tachycardia (normal QRS when in sinus rhythm)|
|SVT with wide QRS related to electrolyte or metabolic disorder|
|SVT with conduction over an accessory pathway (pre-excitation)|
SVT indicates supraventricular tachycardia.