Narrow Complex Tachycardia VS Wide Complex Tachycardia

Tachycardia, also called tachyarrhythmia, is a common type of heart rhythm disorder in which the heart rate exceeds the normal resting rate. Usually, a resting heart rate over 100 beats per minute is regarded as tachycardia in adults.

There are different types of tachycardia, all these types can be classified into narrow and wide complex based on the QRS complex which represents the central and most visually obvious part of the tracing in ECG. Narrow and wide refer to the width of the QRS complex on the ECG. Usually, the narrow complex tachycardia tends to originate in the atria, while the wide complex tachycardia tends to originate in the ventricles.

The forms of narrow complex tachycardia.

  • Junctional tachycardia
  • Atrial tachycardia
  • AV nodal reentrant tachycardia
  • Accessory pathway mediated tachycardia
  • Multifocal atrial tachycardia
  • Sinus tachycardia
  • Atrial fibrillation
  • Atrial flutter

The forms of wide complex tachycardia.

  • Ventricular tachycardia
  • Pacemaker-tracked or pacemaker-mediated tachycardia
  • Supraventricular tachycardia with pre-excitation
  • Supraventricular tachycardia with aberrancy

Keywords: wide complex tachycardia; narrow complex tachycardia

* The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.