Tachycardia is a heart rate that exceeds what would be considered as a normal heart rate. Typically this is a resting heart rate greater than 100 beats per minute (bpm). Tachycardia can be a dangerous condition depending on the type of rhythm and speed of heart rate. This can result in unstable tachycardia where cardiac output is reduced to the point of causing symptoms. If tachycardia becomes symptomatic, then treating the tachyarrhythmia becomes necessary.
An ECG is used to classify the type of Tachycardia. Tachycardia is either narrow or wide complex based on the QRS complex.
- Sinus tachycardia
- Atrial fibrillation
- Atrial flutter
- AV nodal reentrant tachycardia
- Accessory pathway mediated tachycardia
- Atrial Tachycardia
- Multifocal atrial tachycardia
- Junctional tachycardia
- Ventricular tachycardia
- Wide complex tachycardia tend to originate in the ventricles