Final answer:
Cardiac arrhythmias can result from disturbances in the heart's conduction system, ischemia and drugs, or failure of the SA node. Various factors such as ischemia, metabolic disorders, drug use, and neurological disorders can contribute to the development of arrhythmias.
Step-by-step explanation:
Cardiac arrhythmias can be caused by disturbances in the normal conduction system of the heart, ischemia and drugs, or failure of the sinoatrial (SA) node. These arrhythmias can include extra beats, supraventricular tachycardias, ventricular arrhythmias, and bradyarrhythmias. Ischemia to the heart muscle, diseases of the heart vessels or valves, metabolic disorders, endocrine system pathologies, neurological disorders, autoimmune pathologies, drug use, and prolonged bed rest can all contribute to the development of cardiac arrhythmias.