What term describes arrhythmias that originate below the bundle of His?

The term that correctly describes arrhythmias originating below the bundle of His is ventricular rhythms. The bundle of His is an essential structure in the heart's conduction system that transmits electrical impulses from the atrioventricular (AV) node to the ventricles. Arrhythmias that occur below this conduction structure involve the ventricles directly, which can lead to various types of ventricular rhythms, such as ventricular tachycardia or ventricular fibrillation.

Ventricular rhythms are characterized by their origin in the ventricular myocardium, which can manifest as different patterns of heartbeats distinct from those originating in the atria or junctional areas, allowing for essential differentiation in diagnosing and treating cardiac conditions. Understanding this distinction is critical for proper management of arrhythmias with potentially significant clinical implications.