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Atrial Escape Complexes

Image 2 of 2 in Series "Ectopic Atrial Complexes"

Description

The underlying rhythm is sinus bradycardia. The third complex is a premature atrial complex. Refractoriness of the SA node increases, resulting in a longer pause. The fourth and fifth complexes are atrial escape complexes, which occur at a rate of approximately 46/min. The sinus rate then increases slightly and sinus bradycardia resumes at a rate of approximately 51/min. Note that the P wave morphologies of the premature atrial complex and the atrial escape complexes are different than those of the sinus complexes and that the PR intervals associated with these ectopic complexes are shorter than those associated with the sinus complexes.

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This image is part of the series "Ectopic Atrial Complexes"

Other images in this series

Premature Atrial Complexes

by: Joe B. Calkins, Jr., M.D.

The underlying rhythm is sinus bradycardia at a rate of approximately 52/min. The third, sixth and eighth complexes are premature atrial complexes. Note the different P wave morphologies as compared to the sinus complexes. Additional findings on this ECG are left axis deviation and an old anteroseptal infarct.