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The Teflon disc of Beall valves is subject to extraordinary wear and tear. Clinical evidence of valvular dysfunction is critical in following patients who have implanted Beall valves. We describe 4 patients with the interesting auscultatory finding of intermittent mitral regurgitation. Each of these patients demonstrated severe wear of the Teflon disc with abnormal intermittent disc tilting noted at cardiac catheterization. Intermittent mitral regurgitation in patients with Beall valves in the mitral position heralds severe valvular dysfunction and should prompt urgent cardiac catheterization and valve replacement.
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