Accelerated junctional tachycardia is a benign rhythm in which the atrioventricular node (A-V node, or junction) speeds up to within 15% faster than the sinus node (the natural rhythm of the heart). Junctional ectopic tachycardia is an abnormal heart rhythm (arrhythmia) in which the junction abnormally speeds up. This can occur due to the cells in the A-V node having what is called enhanced automaticity, or the ability to go much faster for no reason. The heart rates for these can vary widely, both depending on the age of the patient as well as the amount of enhanced automaticity.
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