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Left atrial abnormality is commonly caused by high blood pressure and the left heart failure. This abnormality means that the left atrium is slightly enlarged under EKG.

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Q: What causes left artial abnormality?
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What is a left atrial abnormality?

Left Atrial Abnormality is a finding on electrocardiograms (EKG). It is suggestive but not diagnostic of an enlarged left atrium, the chamber receiving blood from the lungs. The most common cause of a big left atrium is high blood pressure but it is by far not the only cause. Other causes include mitral valve disease (valve separating left atrium and left ventricle) and left heart failure (cardiomyopathies).