Scanning and Transmission Electron Microscopic Studies on Isolated Ruptures of Chordae Tendineae

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概要

• 論文の詳細を見る

• Electron microscopic studies of chordae tendineae of the mitral valve were carried out in 17 patients who underwent mitral valve replacement due to a spontaneously isolated rupture of chordae tendineae. The normal chordae, used as the control group, were obtained at autopsy from 5 patients who died from extracardiac causes and were compared with the ruptured chordae. In all patients with chordal rupture, scanning electron microscopy showed perforations of the chordae tendineae, with extensive desquamation and disruption of the endothelial cells and wide-spread destruction of the collagen fiber bundles in the central collagenous core. These pathological findings were not observed in the normal chordae from the control group. Transmission electron microscopy showed that the ruptured chordae were characterized by heterogeneous collagen fibrils with intrinsic structural alterations and disorganization in fibril arrangement. There was a wide variation in the diameters of collagen fibrils which always showed abnormal morphology, with abnormally large, peculiarly shaped fibrils. Apparent loss and/or a disordered arrangement of the typical periodicity of the fibrils were frequently observed. In addition, various degrees of degenerative changes of collagen tissue were often present. These abnormalities were never seen in the fibrils of the normal chordae, and were observed consistently in both the fibrils of the ruptured chordae and in the macroscopically intact chordae in the group with spontaneous rupture of chordae tendineae. These results suggest that a defective organization of collagen into fibrils and fibers, associated with secondary degeneration of collagen within the central collagenous core of the chordae tendineae, are important pathogenetic mechanisms for spontaneously isolated ruptures of chordae tendineae.

• International Heart Journal刊行会の論文

著者

• LEE Ying-Shiung

  Cardiovascular Division, Department of Internal Medicine, Chang Gung Memorial Hospital

• CHANG Chau-Hsiung

  Cardiovascular Division, Department of Internal Medicine, Chang Gung Memorial Hospital

• CHEN Hsin-Chin

  Cardiovascular Division, Department of Internal Medicine, Chang Gung Memorial Hospital

• LIANG Gan-Fang

  Cardiovascular Division, Department of Internal Medicine, Chang Gung Memorial Hospital

関連論文

• Scanning and Transmission Electron Microscopic Studies on Isolated Ruptures of Chordae Tendineae
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