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Biomedical subjects

A G Belonozhko

Publications and source records attributed to A G Belonozhko.

At least 19 recordsLinked to original sources
PubMed1998

[The hormone level of the blood from the aorta and the coronary sinus in patients with ischemic heart disease under conditions of preoperative stress].

A total of 156 patients with ischemic heart disease were examined under conditions of preoperative stress in a multiple-modality study performed with the aid of such techniques as echocardiography involving calculation of the myocardial mass index, coronaroventriculography, measurements of the adrenocorticotrophic hormone, hydrocortisone, somatotrophic hormone, triiodothyronine and thyroxin in the blood from the coronary sinus and aorta. A conclusion has been reached that emotional strain influences myocardial hypertrophy. A possible significance of the studied hormonal indices is shown together with features thereof in IHD patients presenting with different degrees of left ventricular hypertrophy.

Adult↗
PubMed1993

[Ventricular arrhythmias in patients with ischemic heart disease: a possible role of the autonomous nervous system].

To reveal possible factors that initiate ventricular arrhythmias (VA) in patients with coronary heart disease (CHD), a total of 44 patients with documented coronary artery stenosis were examined. The patients underwent coronary ventriculography, bicycle ergometry, 24-hour Holter monitoring, and examination of the autonomic nervous system (ANS). In 24 patients (Group 1), myocardial ischemic episodes were accompanied by VA. The latter were absent in myocardial ischemia in 20 patients (Group 2). In the two groups, there were no statistically significant differences in parameters, such as severity of atherosclerotic lesion of coronary arteries, total ejection fraction, existence of regional asynergy, exercise tolerance, number of daily myocardial ischemic episodes, their duration, degree of ST segment displacement. Increased activity of the sympathetic ANS was detected in 20 (83.3%) patients from Group 1 and only in 3 (15%) from Group 2 (p < 0.05). It is suggested that enhanced functional activity of ANS may be a prerequisite for displaying arrhythmogenic mechanisms in myocardial ischemia.

Adult↗
PubMed1992

[Diastolic filling of the left ventricle in relation to the degree of its hypertrophy in patients with ischemic heart disease].

The features of diastolic filling of the left ventricle (LV) were examined in relation to the nature of its hypertrophy in patients with coronary heart disease (CHD). A total of 110 male patients with CHD concurrent with essential hypertension or without it who underwent contrast ventriculography in order to determine LV diastolic stiffness. Radionuclide ventriculography was performed in 49 patients at rest and during exercise. The CHD patients with moderate LV concentric hypertrophy had more adequate LV diastolic filling in the presence of concurrent essential hypertension. Abnormal diastolic filling was more pronounced in CHD patients without hypertrophy or its eccentric development than in those without essential hypertension.

Adult↗
PubMed1990

[Causes and significance of myocardial ischemia occurring during coronary-ventriculography in patients with ischemic heart disease].

A relationship was examined between the development of myocardial ischemia in patients with coronary heart disease before coronary ventriculography and the status of coronary vessels, coronary reserve, myocardial contractility, and the autonomic nervous system. Before coronary ventriculography, myocardial ischemia was found to occur in the patients when there was a marked activation in the sympathetic portion of the autonomic nervous system and a clear-cut decrease in coronary reserve. The occurrence of myocardial ischemia in the patients before coronary ventriculography contributed to decreased left ventricular myocardial contractility and increased the cardiodepressive effects of a contrast agent.

Adult↗
PubMed1989

[Myocardial blood flow and changes in the electrocardiogram during veloergometry in patients with ischemic heart disease].

The authors studied in 64 patients with ischemic heart disease and 14 control persons the myocardial blood flow and its relationship with depolarization and repolarization indices and depression of the ST segment at threshold loads. The myocardial blood flow in IHD patients with stenosing atherosclerosis of two and three coronary arteries was reduced by 50% and the tolerance to physical load was low.

Coronary Circulation↗
PubMed1987

[Comparative analysis of the information value of electrocardiographic loading tests in relation to the characteristics of atherosclerotic lesions of the coronary arteries].

Diagnostic possibilities of various exercise tests (bicycle ergometry, the dipyridamole test, atrial electrostimulation) were demonstrated, as was a relationship between their sensitivity and the number of stenosed coronary arteries, the extent and level of obstruction, collateral circulation specificity and myocardial function.

Adult↗
PubMed1987

[ECG changes during the exercise test and perfusion pressure in the basin of the left coronary artery].

Variation in cumulative electrocardiographic depolarization (delta epsilon QRS) and repolarization (delta epsilon T and ST depression below 1 mm and more) parameters at threshold stress, achieved by stepwise augmentation, was compared with perfusion pressure in the left coronary arterial network, measured at coronaro-angiography, in 103 coronary patients. It is concluded that changes in cumulative ECG parameters at threshold stress can only be suggestive of a possible drop in perfusion pressure in the left coronary arterial network.

Adult↗
PubMed1986

[Importance of collateral circulation for compensating for myocardial ischemia during physical loading in ischemic heart disease patients].

Exercise-induced electrocardiotopographic ST depression was analysed with reference to the presence of a collateral blood flow, angiographic assessment of the coronary bed and a history of myocardial infarction in 94 coronary patients. The presence of a collateral blood flow is shown to contribute to a more rapid elimination of post-exercise myocardial ischemia, irrespective of the number of affected coronary arteries and the history of myocardial infarction. Myocardial ischemia developing in response to exercise is particularly extensive in case of multiple coronary arterial lesions and the presence of a collateral blood flow.

Adaptation, Physiological↗
PubMed1986

[Assessment of the the physical loading tolerance of ischemic heart disease patients in relation to different sites of the coronary artery lesion].

An analysis of physical exercise tolerance in CHD patients with the equal number of affected coronary arteries with relation to a coronary bed region involved in a pathological process, showed that its decrease was mostly pronounced in vasoconstriction of the left coronary arterial system and was determined by a decrease in the blood flow in this region.

Angina Pectoris↗