M-mode echocardiography can be used to diagnose cor triatriatum by identifying abnormal echoes in the left atrium.
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M-mode echocardiography may aid cor triatriatum visualization in select cases; leaves open its role versus contemporary imaging.
Summary: M-mode echocardiography displayed abnormal echoes in the left atrium and posterior to the mitral leaflets in a child with severe heart failure. Cor triatriatum was demonstrated by angiography and cured by surgical excision. Subsequent echo studies no longer showed the abnormal structure.
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Bett et al. (1978) studied this question.
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