Ectopic atrial rhythm is atrial activity arising from a site other than the anatomical region of the sinus node.

Electrocardiographic Criteria

  • The P wave has a morphology (polarity) different from that of sinus rhythm.

ECG in Ectopic Atrial Rhythm

Electrocardiogram showing ectopic atrial rhythm

Ectopic atrial rhythm. Regular rhythm with negative P waves in leads II, III, aVL and V3 to V6.

References

  1. Samesima N, God EG, Kruse JCL, Leal MG, et al. Diretriz da Sociedade Brasileira de Cardiologia sobre a Análise e Emissão de Laudos Eletrocardiográficos – 2022. Arq Bras Cardiol. 2022;93(3 Suppl 2):2–19.