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| {{Infobox_Disease |
| | #redirect:[[Right atrial enlargement]] |
| Name = {{PAGENAME}} |
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| Image = RAE.png|
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| Caption = |
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| Width = 200px |
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| DiseasesDB = |
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| ICD10 = |
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| ICD9 = |
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| ICDO = |
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| OMIM = |
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| MedlinePlus = |
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| eMedicineSubj = |
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| eMedicineTopic = |
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| MeshName = Right+Atrial+Enlargement |
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| MeshNumber = |
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| }}
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| {{SI}}
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| {{CMG}}; '''Associate Editor-In-Chief:''' {{CZ}}
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| {{SK}} Himalayan P waves, Himalayan P-wave, giant P waves, right atrial abnormality
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| ==Overview==
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| [[Right atrial enlargement]] can result from increased pressure in the [[pulmonary artery]]. A [[P wave]] >2.5 mm in leads II, III and aVF
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| or a [[P wave]] >1.5 mm in lead V1 indicates right atrial enlargement. Despite the increase in the height of the [[P wave]], the width of the [[P wave]] does not change. Sometimes these large [[P waves]] can be referred to as Himalayan P waves.
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| == Differential Diagnosis of Underlying Causes of Right Atrial Enlargement==
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| * [[Atrial aneurysm]]
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| * [[Atrial septal defect]]
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| * [[Cor pulmonale]] or [[right heart failure]]
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| * [[Ebstein's anomaly]]
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| * [[Primary Cardiac Tumors|Tumor]]
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| * [[Pulmonic stenosis]]
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| * [[Tricuspid prolapse]]
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| * [[Tricuspid regurgitation]]
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| * [[Tricuspid stenosis]]
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| ==The EKG in Right Atrial Enlargement==
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| Right atrial enlargement is defined as either:
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| * A [[P wave]] >2.5 mm in leads II, III and aVF
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| * A [[P wave]] >1.5 mm in lead V1
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| Shown below is an illustration of right atrial enlargement:
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| [[Image:right_atrial_enlargement.jpg|center|500px]]
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| ----
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| 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:
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| [[Image:RAE.png|Right atrial enlargement|center|500px]]
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| ----
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| [[Category:Electrophysiology]]
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| [[Category:Cardiology]]
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