Tachycardia classification
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor-In-Chief: M.Umer Tariq [2]
Overview
Tachycardias can be classified in a variety of ways. One form of classification is whether it is a wide-complex tachycardia, or whether it is a narrow-complex tachycardia. Another way of classifying tachycardia is whether the rhythm is regular or whether it is irregular. Tachycardia can also be distinguished by type; whether is is a sinus tachycardia, a ventricular tachycardia, a supraventricular tachycardia, or atrial fibrillation.
Classification
Origin of the Pacemaker
Atrial Rhythms
- Atrial fibrillation (Afib)
- Atrial flutter
- Multifocal atrial tachycardia
- Premature atrial contractions (PACs)
- Sick sinus syndrome
- Sinus tachycardia
- Supraventricular tachycardia (SVT)
- Wandering atrial pacemaker
Atrial Ventricular Arrhythmias
Junctional Arrhythmias
- Junctional rhythm
- Junctional tachycardia
- Premature junctional complex
Ventricular Rhythms
- Accelerated idioventricular rhythm
- Premature ventricular contractions (PVC)
- Ventricular tachycardia
- Ventricular fibrillation
QRS Morphology
It is sometimes useful to classify tachycardias as either narrow complex tachycardias (often referred to as supraventricular tachycardias) or wide complex tachycardias. Narrow and wide refer to the width of the QRS complex on the ECG. Narrow complex tachycardias tend to originate in the atria, while wide complex tachycardias tend to originate in the ventricles.
Rhythm Regularity
Tachycardias can be further classified as either regular or irregular.