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Narrow Complex Tachycardia ❤️
Related Subjects: |Wolff-Parkinson White syndrome (WPW) AVRT |Lown Ganong Levine Syndrome AVRT |Supraventricular Tachycardia (SVT) |Atrioventricular Nodal Reentrant Tachycardia AVNRT |Atrial Flutter |Atrial Fibrillation |Sinus Tachycardia |Sinus Arrhythmia |Multifocal Atrial Tachycardia |Resuscitation - Adult Tachycardia Algorithm
Overview
- Narrow Complex Tachycardia is characterized by a QRS complex duration of less than 120 milliseconds (or 3 small squares on an ECG).
- This type of tachycardia indicates that the source of the rapid heart rate is typically above the ventricles (supraventricular in origin), leading to efficient and synchronous ventricular contraction.
Key Characteristics
- QRS Duration: < 120 ms (3 small squares)
- Heart Rate: Generally > 100 bpm, often ranging from 150-250 bpm in conditions such as atrioventricular nodal reentrant tachycardia (AVNRT).
- Types: Common forms include:
- Atrioventricular Nodal Reentrant Tachycardia (AVNRT)
- Atrioventricular Reentrant Tachycardia (AVRT)
- Atrial Tachycardia
- Atrial Flutter with 2:1 Conduction (often presenting with a heart rate around 150 bpm)
Diagnostic Links and Causes
- Refer to links on common causes of supraventricular tachycardias (SVTs), such as AVNRT, AVRT, and atrial tachycardias for further details.
ECG Example
Example of Narrow Complex Tachycardia on ECG: Below is an image illustrating the ECG features of a typical narrow complex tachycardia, with rapid, regular rhythm and narrow QRS complexes.
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