<prompt> Answer this question truthfullyCould you please explain what atrial enlargement is?  <response>: <reason> Right atrial enlargement is defined as either:A P wave 2.5 mm in leads II, III and aVF A P wave 1.5 mm in lead V1Shown below is an illustration of right atrial enlargement:Shown below is an EKG demonstrating large P waves in leads to 2,3, and aVF which have a P-wave height greater than 2.5 mm consistent with right each one enlargement: 