New Noninvasive Assessment of Regional Left Ventricular Function by Digital Subtraction Angiography without the Use of Contrast Medium.
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概要
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We have developed a new noninvasive method to evaluate regional left ventricular (LV) function by digital subtraction angiography (DSA) without the use of contrast medium. DSA images of the left ventricle with and without contrast medium were obtained from 35 patients with anterior myocardial infarction (MI) and from 35 control subjects. Using an image-processing computer, regional LV time-density curves were constructed for one cardiac cycle. Regional LV time-density curves obtained from DSA without the use of contrast medium presented a pattern similar to those from intravenous DSA. The amplitude of regional LV time-density curves in patients with MI decreased along with increasing severity of regional wall motion abnormality assessed by conventional left ventriculography. In attempting semi-quantitative evaluation by DSA without the use of contrast medium, the regional wall motion index (RWI) in the 6 segments of the left ventricle was calculated by normalizing segmental density changes to the maximal segmental density changes. When compared with control subjects, patients with MI have significantly lower RWIs in the anterolateral and apical regions. RWI showed a good correlation with the regional ejection fraction (REF) obtained from intravenous contrast DSA (r=0.83). RWI decreased with increasing severity of regional wall motion abnormality by qualitative analysis in conventional left ventriculography, being consistent with REF. The diagnostic accuracy of RWI therefore seemed to be comparable to that of REF derived from intravenous contrast DSA. These results indicate that computerized analysis of DSA without the use of contrast medium is a valuable noninvasive method for semi-quantitative assessment of regional LV function.
著者
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Ueno Takafumi
Third Department Of Internal Medicine Kurume University School Of Medicine
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Koga Yoshinori
Third Department of Internal Medicine, Kurume University School of Medicine
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YAMAGA Akihiko
Third Department of Internal Medicine,Kurume University School of Medicine
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NAKAYAMA Hiroshi
Third Department of Internal Medicine, Kurume University School of Medicine
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Ikeda Hisao
Third Department Of Internal Medicine Kurume University School Of Medicine
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Koga Yoshinori
Third Department Of Internal Medicine Kurume University School Of Medicine
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SHIRAISHI Akihiko
Third Department of Internal Medicine, Kurume University School of Medicine
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TOSHIMA Hironori
Third Department of Internal Medicine ,Kurume University School of Medicine
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SHIBAO Keigo
Third Department of Internal Medicine, Kurume University School of Medicine
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KANEMITSU Yasuko
Third Department of Internal Medicine, Kurume University School of Medicine
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HIYAMUTA Kohji
Third Department of Internal Medicine, Kurume University School of Medicine
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YAMAGA Akihiko
Third Department of Internal Medicine, Kurume University School of Medicine
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