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The causative mechanisms of mitral valve prolapse in progressive muscular dystrophy:Thorax and thoracic spine deformity and left ventricular dysfunction Yoshimitsu Yazawa 1 , Nobuyuki Miyatani 1 , Naoyuki Takasawa 1 , Akira Shibata 2 1Niigata National Sanatorium 2First Department of Internal Medicine, Niigata University School of Medicine pp.275-279
Published Date 1984/3/15
DOI https://doi.org/10.11477/mf.1404204407

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  • Abstract
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 The causative mechanisms of mitral valve prolapse (MVP) were evaluated in 58 patients (pts) with progressive muscular dystrophy (PMD). Two possible causes, 1) left ventricular (LV) dysfunction and 2) thorax and thoracic spine deformities were assessed. Pts were classified into three groups by echocardiographic findings. Group 1 (GI) : 31 pts MVP, G2 : 11 pts c MVP by M-mode echocardiogram only, G3 : 16 pts c MVP by both twodimensional and M-mode echocardiograms.

 LV functions evaluated by systolic time intervals and fractional shortening showed no significant differences among three groups.

 The degree of scoliosis of the thoracic spine defined by chest plain film was not related to the incidence of MVP. On the other hand, the pts with anteriorly deformed thoracic spines were found to have a very high incidence of MVP as follows. Lordotic or straight spines were found in 32.3%, 100%, 93.8% in Gl, G2 and G3 respectively. And the incidence of MVP in cases with kyphosis, straight spine and lordosis was 4.8%, 66.7% and 77.8% respectively.

 The shape of the thorax defined as the ratio of anteroposterior (AP) internal diameter and transverse internal diameter was more flattened in G2 and G3 than in G1.

 From these results, we concluded as follows :

 1) Depressions of LV function were not related to the incidence of MVP.

 2) The lordotic or straight spines and the thoraces with short AP internal thoracic diameters were thought to be major factors for the occurrence of MVP in PMD.


Copyright © 1984, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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