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The So-Called 'Eclipsed' Mitral Regurgitation.

An 89-year-old female was referred to the authors' institution for repeating pulmonary edema. Recent transthoracic echocardiography (TTE) showed only a mild mitral regurgitation (MR), but a transient severe reversible functional MR was observed during an episode of respiratory distress. TTE demonstrated the functional nature of the regurgitation with a transient tenting of the mitral leaflets, resulting in a total absence of coaptation.