What phenomenon occurs when the ring anode captures conduction on the right side of the interventricular septum (IVS) at higher outputs?

The phenomenon referred to occurs when the ring anode effectively captures and stimulates the conduction of cardiac signals in a specific area, particularly the right side of the interventricular septum, at higher outputs. This is known as anodal capture. In this context, the anode serves as the positive electrode that interacts with the heart's electrical system, resulting in the generation of depolarization at the site of capture.

Anodal capture primarily signifies that the stimulation from the ring anode is strong enough to influence the surrounding myocardial tissue, facilitating conduction pathways that may not have been otherwise engaged at lower output levels. This can lead to reliable pacing and rhythm management in patients with conduction abnormalities.

The understanding of this concept is crucial for electrophysiologists when optimizing pacing strategies, ensuring consistent capture, and recognizing the electrical behaviors of the heart under various stimulation conditions.