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D Djurić

Publications and source records attributed to D Djurić.

27 records · Page 2Linked to original sources
PubMedDate not supplied

[The effect of gender on vasomotor function of the vascular endothelium and cardiovascular remodelling during aging].

INTRODUCTION: Aging is correlated with decreased endothelial vasomotor influence, increased carotid intima-media thickness and stiffness, increased left ventricular mass index and increased blood pressure [1-3]. However, these changes are not expressed in the same way in both genders [4, 5]. It seems that females are more protected from cardiovascular changes during aging compared to males [1, 6]. AIM OF THE STUDY: The aim of the study was to evaluate the influence of gender on brachial vasomotor responses (reactive hyperemia test) as well as the correlation with vascular and cardiac remodelling in healthy volunteers of different ages. MATERIAL AND METHODS: The study was carried out on healthy subjects (n = 66; 37 males, 29 females) of different ages (20-82 years) with no history of cardiovascular diseases and diabetes mellitus. All subjects were normotensive, non-smokers with normal blood lipid and glucose values, were not taking any medication at the time of investigation and were asked to refrain from eating and drinking alcohol, coffee or tea 12 hours before the examination. Subjects were divided in two groups (male and female) and 5 age-related groups according to appropriate decade (20-29, 30-39, 40-49, 50-59, and above 60 years). All subjects underwent regular cardiologic examination, ECG recording and cardiac ultrasound in order to exclude valvular diseases, decreased myocardial contractility and ejection fraction. During the study blood pressure and ECG were recorded continuously. Carotid artery intima-media thickness and brachial artery diastolic internal diameter (mm) and blood flow (ml/min) values were measured continuously using high-resolution ultrasound. Brachial artery parameters were measured in baseline condition, during ischaemia and reactive hyperemia (endothelium-dependent relaxation) and after nitroglycerin administration (endothelium independent relaxation, 2 x 400 micrograms, sublingual) [7, 8]. Brachial ischaemia was induced by inflation of a pneumatic tourniquet placed at the forearm to a pressure of 300 mmHg followed by deflation after 3 min. We analyzed changes in peripheral arteries (changes in brachial artery diastolic diameter and flow during 90 sec after cuff deflation), structural changes of carotid artery, functional and structural changes of the left ventricle (19-11). We used cardiac ultrasound (Hewlett Packard Sonos 2500) with a 2.0-2.5 MHz imaging transducer and a 7.0-MHz linear array transducer for vascular measurements. Demographic and clinical characteristics of subjects are presented in Table 1. All results are expressed as mean and S.E.M. Data analysis was done by linear regression analyses, multivariate test (LSD procedure) and Student's T-test. P values less than 0.05 were considered to be significant. RESULTS: Relative changes in brachial artery diastolic diameter in reactive hyperemia in comparison to aging (with gender distribution) are shown in Graphs 1 and 2. Our study showed decrease in brachial vasodilator response to reactive hyperemia during aging (male p < 0.05, female p < 0.001). Data analysis showed a significant difference between age-related groups above 40 years and groups below 30 years of age (p < 0.001). The analysis of carotid intima-media thickness showed increased values during aging in both genders but without statistical significance (Graph 2). Analysis of relationship between carotid intima-media thickness and aging (by gender) showed a good correlation of these parameters expressed by the following formula: intima-media thickness (cm) = 0.0009 x years of age + 0.0139. ANOVA test for age-related groups showed significant correlation (p < 0.01) between all age-related groups except 30-40 vs. 40-50 year group. Student's T-test showed no significant correlation between genders. The relationship between the left ventricular mass index (LVMI) and aging (with gender distribution) is shown in Graphs 3 and 4. The left ventricular mass index was increased during aging

Adult↗
PubMedDate not supplied

Changes in serum angiotensin I converting enzyme activity due to carbon disulfide exposure.

The activity of serum angiotensin I converting enzyme (ACE) was determined in 50 workers from a viscose factory in Banja Luka, Yugoslavia, and in 50 control subjects. Activity of serum ACE was significantly lower in workers exposed to carbon disulfide than in the control group. No correlation was found between a decrease of serum ACE in exposed workers and duration of exposure. These findings indicate that the serum ACE may be influenced by carbon disulfide, but the mechanism of these changes remains to be elucidated in this case.

Adult↗
PubMedDate not supplied

Proposal for the "Antabuse test".

Author describes development of the "Antabuse test" as preemployment predictive test of susceptibility of workers to carbon disulfide. He reviews all publications of his group, as well as publications of other groups on this subject. In discussion the hypothesis explaining this phenomenon is presented. Also practical suggestions for performing "Antabuse test" are mentioned.

Administration, Oral↗
PubMedDate not supplied

Study of ocular tissue changes, brain GABA and polyamine levels in rats exposed to carbon disulfide.

The authors observed Wistar rats exposed to the various concentrations of carbon disulphide. They studied as the histological tissue changes as brain GABA and polyamine levels. They found the identical tissue changes in the both exposed groups and changes in the control one. The level of spermine was increased for about 1103% in the brain of animals exposed to CS2 concentration of 2500 mg/m3 and 137% in exposure to 5000 mg/m3 of CS2, which differences were statistically significant in comparison with the control group. It suggests that CS2 was producing inhibition of enzyme system involved in the degradation of spermine.

Animals↗
PubMedDate not supplied

[Functional characteristics of endothelium in arterial hypertension].

With findings of prostacyclin, known as a very potent antiplatelet, anticoagulant, vasodilator, a profibrinolytic and cytoprotective substance from arachidonic acid cascade, many different endothelium-derived vasoactive substances were discovered. It is known (1980) that intact endothelium is necessary for the vasorelaxant effect of acetylcholine in isolated rabbit aorta. The balance between relaxing and contracting factors of endothelial origin is very important for optimal blood vessel diameter and tissue perfusion. The existence of endothelium-derived vascular smooth muscle cells growth and proliferation factors is a new important dimension in the understanding of function of vascular endothelium.

Animals↗