The term ectopic refers to an extra muscle bundle consisting of working myocardial tissue that forms a connection between the atria and ventricles outside the normal conduction system.

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The term ectopic, which means out of place, is used to describe an impulse that originates from a source other than the SA node. Ectopic pacemaker sites include the cells of the AV bundle and Purkinje fibers, although their intrinsic rates are slower than that of the SA node.

The Term Ectopic Refers to an Extra Muscle Bundle Consisting