Atrial Premature Complexes

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This is part of: Supraventricular Rhythms
A premature atrial complex (PAC). (In this example the atrial p-wave is difficult to discern).
A premature atrial complex (PAC) with evident negative p-wave

Premature atrial complexes origin from an ectopic pacing region in the atria. They are an example of ectopic beats. The result is a p-wave with often a different morphology as the preceding ones.