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| There are many diagnostic tests that have abnormal results in the presence of mitral regurgitation.
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| These tests suggest the diagnosis of mitral regurgitation and may indicate to the physician that further testing is warranted. For instance, the [[electrocardiogram]] (ECG) in long standing mitral regurgitation may show evidence of left atrial enlargement and [[left ventricular hypertrophy]].
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| [[Atrial fibrillation]] may also be noted on the ECG in individuals with chronic mitral regurgitation.
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| The ECG may not show any of these finding in the setting of acute mitral regurgitation.
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| The quantification of mitral regurgitation usually employs imaging studies such as echocardiography or magnetic resonance angiography of the heart.
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