View source for Atrial Premature Complexes

{{Chapter|Supraventricular Rhythms}}
[[Image:Rhythm_premature.png|thumb| A premature atrial complex (PAC). (In this example the atrial p-wave is difficult to discern).]]
[[Image:Bes.png|thumb| A premature atrial complex (PAC) with evident negative p-wave]]
Premature atrial complexes origin from an ectopic pacing region in the atria. The result is a p-wave with often a different morphology as the preceding ones. 
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