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僧帽弁輪部の石灰化病変に関する報告は,1930年代から数多くみられ,直接的な原因は現在に至っても今だ明らかにされていないが,近年ではLev1),Lenegre2),Fulkerson3),およびPomerance4)らの詳しい論文があり,その病態変化は不整脈を中心に僧帽弁や大動脈の石灰化等,多彩にわたって存在することが知られている。我々の施設でも,ここ数年来明らかに僧帽弁輪部の石灰化病変が確認された8例を経験したが,その多くに失神発作を呈する高度な房室ブロックを伴い,さらにヒス束電位記録により第1度から第3度にわたるヒス束内ブロックを呈していた例が多く認められたため,うち1症例を提示し,多少の考察を加え報告する。
Eight cases of mitral annular calcification were studied. All cases were accompanied by other cardiac abnormalities. Electrocardiographic ab-normalities were manifested in seven of the 8 cases. The abnormalities were as follows ; second degree or high grade atrioventricular conduction disturbances in 4 cases, left anterior hemiblock and bifascicular block in two cases respectively, and atrial fibrillation in one case.
And 4 of these cases were followed by Stokes-Adams syndrome. In three of these 4 cases, intra-His conduction disturbances were manifested by His bundle electrocardiography, detecting III-rd degree intra His block in two cases, and I-st to II-nd degree intra His block in one case.
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