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  • Title: Pericardial effusion and electrical alternans: echocardiographic assessment.
    Author: Sbarbaro JA, Brooks HL.
    Journal: Postgrad Med; 1978 Mar; 63(3):105-9, 112. PubMed ID: 628641.
    Abstract:
    Clinical diagnosis of pericardial effusion is often difficult, and assessment of the effects of effusion on cardiac hemodynamics is often imprecise. Electrical alternans is a reasonably specific ECG indicator of the presence of a large effusion and imminent or actual cardiac tamponade. If echocardiography verifies the presennce of pericardial fluid and shows abnormal cardiac motion, a diagnosis of cardiac tamponade can be made without further, more invasive, studies.
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