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(Chest. 1974;66:441-444.)
© 1974 American College of Chest Physicians

Sinus Rhythm with Ineffective Left Atrial Contraction in Severe Mitral Stenosis

Amadeo Betriu M.D.1; Gines Sanz M.D.1; Allan G. Adelman M.D.1; and E. Douglas Wigle M.D.1

1 Cardiovascular Unit and, Division of Cardiology, Toronto General Hospital and the Department of Medicine, University of Toronto

The present report documents the absence of left atrial "a" waves in two patients with sinus rhythm and longstanding mitral stenosis. In both cases clearly identified right atrial "a" waves were recorded. Left atrial pressure tracings were obtained by transseptal heart catheterization. Ineffective left atrial contraction due to electromichenical dissociation provided a satisfactory explanation for this phenomenoa.




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