In cardiac physiology, what term refers to the abnormal triggering of depolarization following a single electrical impulse?

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The term that refers to the abnormal triggering of depolarization following a single electrical impulse is "triggered activity." This phenomenon occurs when a cardiac cell experiences a depolarizing event that leads to an additional phase of depolarization, often resulting in premature or extra heartbeats. Triggered activity may arise due to various mechanisms, including afterdepolarizations, which are additional oscillations in the membrane potential that occur after the normal action potential. This can lead to arrhythmias, as the cell is activated inappropriately due to the abnormal depolarization following the initial impulse.

In contrast, automaticity refers to the ability of certain cardiac cells to generate spontaneous action potentials without external stimulation. Reentry is a mechanism whereby an electrical impulse travels in a continuous loop within a circuit of myocardial tissue, often leading to tachyarrhythmias. Ectopic pacing occurs when impulses are generated from a location outside the normal pacemaker of the heart, usually resulting from abnormal automaticity or triggered activity but does not specifically describe the phenomenon of abnormal depolarization after a single impulse like triggered activity does. Thus, your selection of "triggered activity" as the correct answer aptly captures the essence of the question.