[Tl-201 perfusion scintigraphy of the myocardium in patients with anomalous origin of the left coronary artery from the pulmonary trunk (clinico-anatomical comparisons)].

The clinical significance of 201Tl myocardial perfusion scintigraphy was studied in 7 patients with abnormal branch of the left coronary artery from the pulmonary trunk and in 1 patient with that of the anterior interventricular artery from the pulmonary trunk. Radiological criteria for the defect were established on the basis of comparative analysis of the data of myocardial scintigraphy with those of electrocardiographic, coronary angiography and anatomic examinations. It was shown that it was feasible to make a differential diagnosis between abnormal left coronary artery branch and dilated cardiomyopathy and that the technique was of value for comparative assessment of the efficacy of various types of surgical treatment for abnormal left coronary artery ramus from the pulmonary trunk.

[Experimental validation of a method for the early diagnosis of the infection of vascular prostheses using 99m-TC-labelled leukocytes].

Experiments on 9 dogs were staged for a study of a method of early diagnosis of infectivity of vascular prostheses of the abdominal aorta with the help of 99m-Tc-labelled leukocytes. A sterile synthetic vascular prosthesis was used for prosthetics of the abdominal aorta in the 1st control group of animals, a prosthesis, previously infected with St. aureus, was used in the 2nd group, a sterile prosthesis with its subsequent infecting by i.

[Quantitative analysis of perfusion scintigrams of the myocardium using 201Tl in ischemic heart disease].

Altogether 111 patients with coronary heart disease (CHD) were examined using loading perfusion scintigraphy testing of the myocardium with 201Tl. Quantitative assessment of scintigrams was based on a computer-assisted method proposed by the authors which was used for determination of indices characterizing a degree of perfusion disorder in each segment of the left ventricular myocardium: the M/B ratio (the ratio of a mean level of radioactivity of a myocardial segment to a mean level of background radioactivity) and the TAI (the thallium accumulation index--a quantitative value of segmental perfusion). The method permits the detection of a zone of disturbed perfusion (ischemia, scar changes and left ventricular aneurysm) and quantitative assessment of the depth of scar lesion of the left ventricular myocardium.

[Central hemodynamic status and left ventricular contractile function in patients with chronic obstructive lung diseases and stable pulmonary hypertension (based on data from radionuclide study methods)].

Systemic, central and intracardiac hemodynamics and left-ventricular contractility were studied radiocardiographically and radioventriculographically in 22 patients with stable pulmonary hypertension, developing in the presence of chronic obstructive pulmonary diseases. A tendency to increased circulating blood volume, significantly elevated end diastolic and end systolic indices, reduced total ejection fraction, and a tendency to decreased segmental ejection fractions were demonstrated. A significant reduction of the speed and percentage of left-ventricular myocardial circular fibre contraction is another evidence of incompetent left-ventricular contractility, in addition to the reduced ejection fraction.