Cardiac dysrhythmia is an abnormal heart beat:
Heart rate and origin (atria or ventricles) are used to help classify cardiac dysrhythmias.
Tachycardia is a fast (over 100 beats per minute) heart rhythm
Dysrhythmias that originate in the atria are termed supraventricular dysrhythmias (supraventricular means above the ventricles).
Ventricular dysrhythmias originate in the ventricles and include:
Bradycardia is a slow (under 60 beats per minute) heart rhythm.
Bradyarrhythmias are slow heart rhythms arising from disease in the cardiac electrical conduction system.
A premature beat is an extra beat, occurring earlier than normal - it is termed an ectopic beat and may be atrial or ventricular in origin
Last reviewed 01/2018