[Perfusion studies of the myocardium using computerized tomography. Comparative studies in normal XXXX and @entity1 with coronary heart disease].

@entity1 @entity453 @entity5377 @entity4341
As a noninvasive method of examination, conventional computer tomography (CT) has assumed an important role in assessment of pathologic anatomy of the heart. In contrast, previously, CT has not been applied for routine investigations of myocardial perfusion. In this study, a new method is described which, with intravenous injection of contrast medium, enables delineation of perfusion differences in the myocardium. Studies were performed in ten healthy male subjects and 71 @entity1 with angiographically-documented @entity453 with a Somatom SF ( @entity5377 ) with a scanning time of five seconds. Prior to contrast injection, a native scan was obtained in the short axis view of the left ventricle as well as in apical and central view. After injection of 30 ml of contrast medium through a 7F ring catheter positioned in the inferior vena cava, imaging was again performed and then repeated subsequent to administration of 0.5 mg/kg @entity4341 . Quantitative evaluation of the CT images was carried out through circumferential analysis of the apical and central segments. The circumference was divided into 60 segments of six degrees each and for each segment ten density measurements were performed to obtain average values subendocardially, intramurally and subepicardially. After correction for the density value of the ascending aorta in healthy subjects, the density profile was constructed. The density profile of the healthy subjects was designated as the mean value curve. The circumferential profile of @entity1 with @entity453 was tested against the mean value curve from which two indexes for description of perfusion disturbances were defined.(ABSTRACT TRUNCATED AT 250 WORDS)
