Causes of a wide QRS complex tachycardia

Ventricular tachycardia (VT)

Any type of supraventricular tachycardia (SVT) with a preexistent bundle branch block or a rate-related (functional) bundle branch block

Sinus tachycardia

Atrial tachycardia

Atrial flutter

Atrioventricular nodal reentrant tachycardia

Atrioventricular reentrant tachycardia (orthodromic)

Any SVT which occurs in a patient receiving an antiarrhythmic drug, primarily class IA or IC, or in a patient with severe hyperkalemia

Any SVT with antegrade conduction via an accessory pathway (Wolff-Parkinson-White syndrome)

Sinus tachycardia

Atrial tachycardia

Atrial flutter

Atrioventricular reentrant tachycardia (antidromic)

Electronic pacemaker in certain specific settings

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