👉 A cardiac arrhythmia is a condition in which the heart's electrical system produces abnormal, irregular or fast-paced electrical activity. These irregularities can lead to a variety of symptoms, including chest pain, shortness of breath, and fatigue, among others. Cardiologists are trained professionals who diagnose and treat these conditions, often using medical devices such as pacemakers or defibrillators to help the heart beat more efficiently.