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Last updated: 16th Sep 2020

Arrhythmia, also known as cardiac dysrhythmia or heart arrhythmia, is a group of conditions in which there is a disruption in the rate of cardiac contractions or any other disparity in the rate or rhythm of the heartbeat. The main types of arrhythmia include atrial fibrillation, supraventricular tachycardia, bradycardia, heart block and ventricular fibrillation.

The causes of arrhythmia are varied and can include diabetes, heart attack or coronary heart disease. They are associated with a large range of conditions and can be classified by their site of origin, mechanism of disturbance, rate of disturbance and electrocardiogram appearance.

Arrhythmias can be acute or chronic and can either be asymptomatic or present with a range of symptoms including dizziness, breathlessness, and palpitations. Asymptomatic arrhythmias can be associated with an increased risk of adverse events such as a higher risk of blood clotting, heart failure, and stroke.

The type and severity of the arrhythmia will determine which treatment is used. In some people no treatment is necessary. For others, treatments can include lifestyle changes, medication (such as antiarrhythmic drugs and anticoagulant therapy), and surgery.

To find out more about cardiac arrhythmia visit our dedicated Learning Zone on anticoagulation for stroke prevention