Which arrhythmia originates below the bundle of His?

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The arrhythmia that originates below the bundle of His is classified as a ventricular rhythm. In the heart's electrical conduction system, the bundle of His is responsible for conducting impulses from the atria to the ventricles. When an arrhythmia originates below this point, it typically indicates that the abnormal electrical activity is occurring within the ventricles themselves.

Ventricular rhythms can arise from several conditions, including ventricular escape rhythms or ventricular tachycardia, and these rhythms often lead to altered heart rates that can have significant implications for the effective pumping action of the heart. This is critical for understanding patient management in telemetry settings, as ventricular rhythms can be more severe and may necessitate immediate medical attention.

In contrast, arrhythmias like supraventricular tachycardia and atrial fibrillation originate above the bundle of His, involving either the atria or the junction of the atria and ventricles. Junctional rhythms also originate at or just below the atrioventricular node, which is still considered above the bundle of His. Consequently, only ventricular rhythms originate from below this point in the conduction pathway, making it the correct answer.