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Ann Thorac Surg 2004;77:857-858
© 2004 The Society of Thoracic Surgeons
Department of Cardiothoracic Surgery, Stanford University, CVRB Building, 2nd Floor, 300 Pasteur Dr, Stanford, CA 94305, USA
Department of Cardiothoracic Surgery, Falk Cardiovascular Research Center, Stanford University School of Medicine, Stanford, CA 94305-5247, USA
e-mail: kotek1@stanford.edu
e-mail: dem@stanford.edu
| The first 20% of the full text of this article appears below. |
The mitral annulus is a discontinuous fibromuscular ring circumscribing the valve orifice, which has a poorly defined anatomical boundary and incompletely understood physiology. Since the pioneering canine experiments of Tsakiris et al in the 1960's, the sphincteric action of the mitral annulus has been thought to have important effects on valve performance by aiding both mitral valve closure and ventricular filling by virtue of its dynamic area change during the cardiac cycle. The current ovine data reported by Gorman and colleagues further elucidate the sphincteric action of the mitral annulus and emphasize its dynamic physiology.
In this elegantly designed sheep experiment,
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