Arrhythmia is caused by abnormal excitation of the sinoatrial node or excitation originating outside the sinoatrial node, where the propagation of excitation is slow, blocked, or conducted through abnormal channels, leading to abnormalities in the frequency and/or rhythm of heartbeats due to origins and (or) conduction disorders of cardiac activity. Arrhythmia is an important group of diseases within cardiovascular diseases. It can occur independently or in conjunction with other cardiovascular diseases. Its prognosis is related to the causes, inducing factors, and evolutionary trends of the arrhythmia, and whether it leads to severe hemodynamic disturbances. It can cause sudden death or continuously affect the heart leading to its failure.