An irregular heartbeat
The electrical impulses that cause the heart to contract must flow, a pathway, in order for it to work right. Any interruption to that, is a result to Arrhythmia
Treat, or, if possible, avoid any risks.
Medicine, procedures, or surgery.
Arrhythmia is diagnosed by 'Cardiologists', which are special doctors, that graduated from their schools to look at people with the heart problem, and diagnose them with the disease.