The prevalence of arrhythmias varies widely based on the specific type and the population studied. For instance, atrial fibrillation (AF) is one of the most common arrhythmias, affecting approximately 1-2% of the general population. The prevalence increases with age, reaching up to 9% in those over 80 years old. Ventricular arrhythmias are less common but have a higher risk of sudden cardiac death.