Assume any wide-complex<unk> ycardia is<unk>  until proven otherwise (it is safer to incorrectly assume a<unk>  dysrhythmia than supraventricular<unk> ycardia with abberancy)
Regular
Monomorphic<unk> 
PSVT with aberrant conduction:
PSVT with bundle branch block^
PSVT with accessory pathway
Atrial flutter with bundle branch block^
Sinus<unk> ycardia with bundle branch block^
Accelerated idioventricular rhythm (consider if less than or ~120 bpm)
Metabolic
Hyperkalemia
Digoxin toxicity
Severe metabolic acidosis
Irregular
Atrial fibrillation/atrial flutter with variable AV conduction AND bundle branch block^
Atrial fibrillation/atrial flutter with variable AV conduction AND accessory pathway (e.g. WPW)
Atrial fibrillation + hyperkalemia
Polymorphic<unk> 
Torsades de pointes
Nonsustained<unk> 
Monomorphic<unk> 
PSVT with aberrant conduction:
PSVT with bundle branch block^
PSVT with accessory pathway
Atrial flutter with bundle branch block^
Sinus<unk> ycardia with bundle branch block^
Accelerated idioventricular rhythm (consider if less than or ~120 bpm)
Metabolic
Hyperkalemia
Digoxin toxicity
Severe metabolic acidosis
PSVT with bundle branch block^
PSVT with accessory pathway
Atrial flutter with bundle branch block^
Hyperkalemia
Digoxin toxicity
Severe metabolic acidosis
Atrial fibrillation/atrial flutter with variable AV conduction AND bundle branch block^
Atrial fibrillation/atrial flutter with variable AV conduction AND accessory pathway (e.g. WPW)
Atrial fibrillation + hyperkalemia
Polymorphic<unk> 
Torsades de pointes
Nonsustained<unk> 
Torsades de pointes
Nonsustained<unk> 
^Fixed or rate-related
Regular
AV Node Independent
Sinus<unk> ycardia
Atrial<unk> ycardia (uni-focal or multi-focal)
Atrial fibrillation
Atrial flutter
Idiopathic fascicular left<unk> 
AV Node Dependent
Paroxysmal supraventricular<unk> ycardia (PSVT)
AV node re-entry<unk> ycardia (AVNRT)
AV re-entry<unk> ycardia (AVRT)
Lown-Ganong-Levine syndrome
Wolff–Parkinson–White syndrome
Junctional<unk> ycardia
Irregular
Multifocal atrial<unk> ycardia (MAT)
Sinus<unk> ycardia with frequent PACs, PJCs, PVCs
Atrial fibrillation
Atrial fibrillation with RVR
Atrial flutter with variable conduction
Digoxin Toxicity
AV Node Independent
Sinus<unk> ycardia
Atrial<unk> ycardia (uni-focal or multi-focal)
Atrial fibrillation
Atrial flutter
Idiopathic fascicular left<unk> 
AV Node Dependent
Paroxysmal supraventricular<unk> ycardia (PSVT)
AV node re-entry<unk> ycardia (AVNRT)
AV re-entry<unk> ycardia (AVRT)
Lown-Ganong-Levine syndrome
Wolff–Parkinson–White syndrome
Junctional<unk> ycardia
Sinus<unk> ycardia
Atrial<unk> ycardia (uni-focal or multi-focal)
Atrial fibrillation
Atrial flutter
Idiopathic fascicular left<unk> 
Paroxysmal supraventricular<unk> ycardia (PSVT)
AV node re-entry<unk> ycardia (AVNRT)
AV re-entry<unk> ycardia (AVRT)
Lown-Ganong-Levine syndrome
Wolff–Parkinson–White syndrome
Junctional<unk> ycardia
AV node re-entry<unk> ycardia (AVNRT)
AV re-entry<unk> ycardia (AVRT)
Lown-Ganong-Levine syndrome
Wolff–Parkinson–White syndrome
Lown-Ganong-Levine syndrome
Wolff–Parkinson–White syndrome
Multifocal atrial<unk> ycardia (MAT)
Sinus<unk> ycardia with frequent PACs, PJCs, PVCs
Atrial fibrillation
Atrial fibrillation with RVR
Atrial flutter with variable conduction
Digoxin Toxicity
Atrial fibrillation with RVR
Ventricular tachycardia
Assume any wide-complex tachycardia is ventricular tachycardia until proven otherwise 
Junctional tachycardia
Regular
Wide-complex tachycardia
Monomorphic ventricular tachycardia
Torsades de pointes
PSVT with aberrant conduction: