Bradycardia

**Definition:** Cardiac arrhythmias that are characterized by excessively slow HEART RATE, usually below 50 beats per minute in human adults. They can be classified broadly into SINOATRIAL NODE dysfunction and ATRIOVENTRICULAR BLOCK.

**Tree numbers:** - C14.280.067.319 - C23.550.073.300

**Synonyms:** - Bradyarrhythmia - Bradyarrhythmias