Cardiomegaly electrocardiogram

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor in Chief: Cafer Zorkun, M.D., Ph.D. [2]

Electrocardiogram

• The presence of q waves suggest a prior MI to account for the enlargement.
• ST segment elevation would suggest either ongoing or resolving ST Elevation Myocardial Infarction or Myocarditis or Pericarditis.
• The EKG may suggest signs of left atrial enlargement, right atrial enlargement or right axis deviation which may point toward a specific diagnosis.

Images shown below are courtesy of Professor Peter Anderson DVM PhD and published with permission. © PEIR, University of Alabama at Birmingham, Department of Pathology

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  Right atrial enlargement

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  Biatrial enlargement