Arrhythmia, Sinus

**Definition:** Irregular HEART RATE caused by abnormal function of the SINOATRIAL NODE. It is characterized by a greater than 10% change between the maximum and the minimum sinus cycle length or 120 milliseconds.

**Tree numbers:** - C14.280.067.093 - C23.550.073.093

**Synonyms:** - Sinus Arrhythmia - Arrhythmia, Sinoatrial - Sinoatrial Arrhythmia