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Left Atrial Enlargement

Atrial enlargement can be determined by analyzing the P waves in leads II and V1. The first half of the P wave represents right atrial depolarization, while the second half represents left atrial depolarization. In left atrial enlargement, a P-mitrale, or wide and notched P wave in lead II (greater than 120 ms) can be seen.

 

P wave morphologies for atrial enlargement in leads II and V1.

Examples

References

  1. Wagner GS, Strauss DG. Marriott’s Practical Electrocardiography. 12th ed. Lippincott Williams & Wilkins; 2014.