title: Clinical evaluation of stress myocardial scintigraphy with thallium-201 in patients with ischemic heart disease. Semiquantitative analysis of single dose myocardial imaging.
abstract: In order to evaluate the usefulness of a stress T1-201 myocardial scintigraphy in semiquantifying the myocardial perfusion, 10 normal subjects and 71 patients with coronary artery diseases were studied with sequential imaging over 3 hours. Myocardial to background ration (M/B) in the exercise phase was significantly higher in the normal subject group than in the coronary artery disease groups. Three hours after exercise (redistribution phase), M/B decreased significantly in the normal subject group but remained unchanged in the coronary artery disease groups. Percent change of M/B with exercise was lower in the effort angina pectoris group (97 +/- 11.2%), and the old myocardial infarction group (101 +/- 14.5%) than in the normal subject group (127 +/- 12%). Sensitivity and specificity of this method were 93% and 47%, respectively. Out of 11 patients with variant angina pectoris, 9 patients showed positive scintigram. Of the 9, however, 6 cases were without organic coronary stenosis in the coronary angiography. There was a significant correlation between M/B on redistribution images (RD.M/B) and ejection fraction determined by left ventriculograms (r = 0.61, p less than 0.001), indicating a close relation between the amount of the residual viable myocardium and the left ventricular function. M/B and its percent change with stress T1-201 myocardial scintigraphy reflect the myocardial perfusion and myocardial perfusion reserve and their semiquantitative analysis provides a useful means for detection of ischemic heart disease.
mesh_terms: D000328:Adult; D000368:Aged; D000787:Angina Pectoris / Q000000981:diagnostic imaging; D000788:Angina Pectoris, Variant / Q000000981:diagnostic imaging; D001157:Arterial Occlusive Diseases / Q000000981:diagnostic imaging; D017023:Coronary Angiography; D003327:Coronary Disease / Q000000981:diagnostic imaging*; D004307:Dose-Response Relationship, Radiation; D005080:Exercise Test; D005188:False Negative Reactions; D005189:False Positive Reactions; D005260:Female; D006321:Heart / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000000981:diagnostic imaging; D011868:Radioisotopes; D011877:Radionuclide Imaging; D013318:Stroke Volume; D013793:Thallium
chemical_list: D011868:Radioisotopes; D013793:Thallium