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- W2467257343 abstract "Relationships between segmental left ventricular wall motion abnormalities and myocardial fibrosis at autopsy were examined in 12 patients who died of dilated cardiomyopathy. In each case, wall motion abnormalities were assessed by two-dimensional echocardiograms for 11 segments, and semiquantitatively evaluated as normokinesis (N) to hypokinesis (H), severe hypokinesis (SH) or akinesis (A). From the necropsy specimens, the myocardial fibrosis ratio was histologically quantitated using a point-counting method in each segment corresponding to the echocardiographic segment. Wall motion abnormalities and the fibrosis ratio correlated significantly in a total of 132 segments of the 12 patients, but there were some discordances. The cases were then categorized in uniform and non-uniform groups based on the patterns of myocardial fibrosis. Wall motion abnormalities correlated much better with the fibrosis ratio in a total of 44 segments among four cases with non-uniform fibrosis, whereas no significant correlation was found in a total of 88 segments in eight cases with uniform fibrosis. The latter group had more severe segmental wall motion abnormalities in the interventricular septum than in the left ventricular free wall; and in the apical portion rather than in the basal portion, although no significant difference was observed in the fibrosis ratio among these regions. Patients with non-uniform fibrosis had higher incidences of chest pain and sudden deaths and a significantly larger left ventricular end-diastolic dimension on M-mode echocardiogram as compared to those with uniform fibrosis. Pathologically, in the former group, the heart was heavier, the mean left ventricular fibrosis ratio was significantly higher, and there was a greater incidence of infiltration of the myocardium by mononuclear cells, but there was no difference in the mean left ventricular wall thickness. These results suggest that myocardial fibrosis mainly contributes to the wall motion abnormalities in cases with non-uniform fibrosis which may be caused by chronic myocarditis, but not in cases with uniform fibrosis. In the latter group, other factors such as reduced contractility of the myocardial cells or lack of a compensatory mechanism for wall stress seem to play important roles in causing left ventricular wall motion abnormalities." @default.
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- W2467257343 date "1987-06-01" @default.
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- W2467257343 title "[Relationships between segmental left ventricular wall motion abnormalities and pathological findings in patients with dilated cardiomyopathy]." @default.
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