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Premature Atrial Contractions in the Inferior Aspect of the Right Atrium

The ECG below contains a PAC originating from the inferior aspect of the right atrium near the coronary artery sinus. Negative P waves appear in inferior lead aVF.

47-year-old man during annual physical ECG.

47-Year-Old Man During Annual Physical ECG

The PR interval in this case is approximately 0.12 seconds. Negative P waves appear in avF, so the origin of the aberrant focus is clearly from the inferior aspect of the right atrium near the coronary sinus rather than from the AV junction.

Related Video – ECG Rhythm Review – Premature atrial Complex (PAC)

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ECG with PACs.

ECG With PACs

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