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  1. An electrocardiographic criterion of left atrial enlargement is a P wave that is too wide in lead II.
    • Dog: P > 0.04 sec
    • Cat: P > 0.04 sec
  2. An electrocardiographic criterion of right atrial enlargement is a P wave that is too tall in lead II.
    • Dog: P > 0.4 mv
    • Cat: P > 0.2 mv
  3. An electrocardiographic criterion of biatrial enlargement is a P wave that is too tall and too wide in lead II.

Comment: The sensitivity and specificity of the ECG criteria for atrial enlargement are low.