[Improvement of the non-invasive diagnosis of coronary heart disease using a new double-isotope method for the noninvasive determination of coronary transit times].
In conventional myocardial Thallium-201 scintigraphy, regional myocardial Thallium-201 activity is compared to the area of normal, i.e., maximal activity. In the presence of multivessel coronary artery disease, this mode of evaluation may yield false negative results. -In 87 patients suffering from coronary artery disease and in 26 controls, after simultaneous i.v. injection of Thallium-201 and Technetium-99m coronary transit times of Thallium-201 were determined as the interval between arrival of the tracer in the aortic root and the onset of its extraction in different myocardial areas. - Patients with hemodynamically significant coronary artery stenoses (greater than or equal to 75%) revealed a significant increase in coronary transit times over septum, apex, or posterolateral wall of the left ventricle. Using maximal coronary transit times, i.e., the largest of the regional values, an excellent discrimination between patients with severe coronary artery stenoses and controls was achieved. Following coronary vasodilatation with dipyridamole, even subcritical (50-75%) coronary artery stenoses could be detected with high sensitivity, since the shortening of coronary transit times in patients with subcritical stenoses was less pronounced as compared to controls. - Especially in the presence of diffuse three-vessel coronary artery disease, the quantitative assessment of regional coronary transit times yields important parametric data in addition to those obtained by conventional Thallium-201 scintigraphy combining static imaging with rapid sequence analysis of time-activity curves.
D003327:Coronary Disease / Q000000981:diagnostic imaging*; D006801:Humans; D011868:Radioisotopes; D011877:Radionuclide Imaging; D013667:Technetium; D013793:Thallium; D013997:Time Factors
D011868:Radioisotopes; D013667:Technetium; D013793:Thallium
Verbesserung der nichtinvasiven Diagnostik der koronaren Herzkrankheit durch nichtinvasive Bestimmung koronarer Passagezeiten mittels einer neuen Doppelisotopenmethode.