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Health Dictionary

Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.

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Left Atrial Enlargement

Introduction

Overview

Overview

Left atrial enlargement may be observed among patients with pressure or volume overload of the left atrium.

Differential Diagnosis of Left Atrial Enlargement

Differential Diagnosis of Left Atrial Enlargement

EKG in Left Atrial Enlargement

EKG in Left Atrial Enlargement

Left atrial enlargement produces a broad, bifid P wave in lead II (P mitrale) and enhances the terminal negative portion (negative deflection) of the P wave in V1.

In lead I and/or II the following may be seen:

  • Bifid P wave with > 40 ms between the two peaks
  • Total P wave duration > 110 ms

In lead V1, the following may be seen:

  • Biphasic P wave with terminal negative portion > 40 ms duration (>0.04 sec or 1 small square)
  • Biphasic P wave with terminal negative portion > 1mm deep
Examples of Left Atrial Enlargement on EKG

Examples of Left Atrial Enlargement on EKG

  • Left atrial enlargement
    Left atrial enlargement
  • 12 lead EKG: Left atrial enlargement
    12 lead EKG: Left atrial enlargement
  • Left atrial enlargement as seen in lead V1.
    Left atrial enlargement as seen in lead V1.
  • Left atrial enlargement, a 12 lead ECG
    Left atrial enlargement, a 12 lead ECG
See Also

See Also


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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [2]; Cafer Zorkun, M.D., Ph.D. [3]