ECG Quest > Rhythms > Extra Beats > Premature atrial complex

Premature atrial complex

A premature atrial complex (PAC) is an extra beat that arrives early, originating from the atria. The P wave often has a different shape to normal. The QRS may be conducted normally (narrow), conducted with aberrancy (wide, often RBBB shaped), or non-conducted (absent). Nonconducted beats may be so early that the AV node is still refractory. There is usually a pause afterwards.

PACs are common and generally benign.

See also: Extra Beats

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References

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In the ECGquest archives, this ECG has been tagged with: - Chest pain Dyspnoea ST elevation in aVR Widespread ST depression Premature atrial complex Sinus tachycardia Aortic stenosis 12-Lead Dr Pendell Meyers Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
An elderly man with sudden cardiogenic shock, diffuse ST depressions, and STE in aVR
In the ECGquest archives, this ECG has been tagged with: - Nonspecific baseline artefact Premature atrial complex Aortic stenosis 12-Lead Dr Pendell Meyers Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
An elderly man with sudden cardiogenic shock, diffuse ST depressions, and STE in aVR

This ECG is from a man in his 80s who presented with sudden onset chest pain and dyspnoea. This was the repeat ECG after he had an aortic valve replacement and CABG.

In the ECGquest archives, this ECG has been tagged with: - Grouped Normal P waves Bigeminy Premature atrial complex 12-Lead ECG Interpretation Dr Ken Grauer CC-BY-NC-SA
ECG Blog #140 – (PVC – Atrial Bigeminy – PAC – LAHB – RBBB – LPHB – Aberration).