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Biomedical subjects

V I Ershov

Publications and source records attributed to V I Ershov.

At least 19 recordsLinked to original sources
PubMed2006

[Free radical peroxidation processes and cardiotoxicity in treatment of malignant lymphomas].

The dynamics of free radical and peroxidation processes in patients with non-Hodgkin lymphomas (NHL) was studied parallel to the evaluation of changes in the functional condition of the cardiovascular system during a course of chemotherapy. Thirty-one patients (17 men; 14 women) aged 30 to 81, were examined. The dynamics of active oxygen forms (AOF) generation was studied using chemiluminiscent technique. The intensity of leucocyte chemiluminiscence (CL) (basal and zimozan-stimulated ones), the blood level of malonic dialdehyde, the antiperoxidation blood plasma activity according to its hydrogen peroxide-induced CL intensity, were measured. The functional condition of the cardiovascular system was evaluated using ECG, EchoCG, and Holter monitoring. The study revealed an increase in AOF generation by leucocytes, which correlated with the severity of the disease. The treatment of the NHL patients with cytostatics was associated with the activation of free radical reactions, which was maximal during the first 24 hours 1 hour after drug administration. Cytostatic therapy was characterized by a cardiotoxic effect, which consisted in an increase in the rate of various arrhythmias and a decrease in the heart contractility. The study demonstrates a direct correlation between the degree of AOF generation growth and the prominence of myocardial lesion signs. The authors conclude that the intensification of free radical reactions under the conditions of cytostatic therapy causes cardiotoxic effects, which requires a course of preventive cardioprotective therapy before chemotherapy is commenced.

Adult↗
PubMed2004

[Multifactor analysis in prediction of outcome for ischemic stroke with combined cardiac symptomatology].

Basing on the results of multiple classifications of 70 clinical, paraclinical and anamnestic signs of ischemic stroke with combined cardiac symptomatology, the models predicting clinical outcome in acute period of the disease and an original scale of numerical score have been worked out. It is mathematically proved that the severity of ischemic stroke with combined cardiac symptomatology, scoring 75 and above, inevitably results in progression of fatal outcome. A group of unfavorable clinical predictors was singled out. The periods with high rate of fatal outcome within exacerbation of ischemic stroke and pathogenic types of stroke were studied. It is first-ever shown that a role of cardiac and neurological symptoms in predicting fatal outcome depends on ischemic stroke severity. A relation between the probable fatal outcome and dynamics of severity of stroke with combined cardiac symptomatology within the first 3 days of the disease was also revealed for the first time.

Adult↗
PubMed2001

[Clinical significance of interaction between Chlamydia infection (Chlamydia pneumoniae) and free radical processes during ischemic heart disease].

AIM: To determine occurrence and activity of chlamydial infection (CI) as well as activity of free radical processes in clinical course of different forms of ischemic heart disease. MATERIAL AND METHODS: 34 coronary heart disease (CHD) patients entered the study. 23(67.6%) of them had effort angina and unstable angina, 11(32.4%) patients had non-Q myocardial infarction (19 men and 15 women). 14 healthy donors served control. CI was detected with enzyme immunoassay. The examinations were made in exacerbation and 2 weeks later in clinical improvement. Chlamydia pneumoniae infection in the tissues of the aorta and left coronary artery was studied in 15 dead bodies using the polymeric chain reaction. Generation of active oxygen forms by leukocytes was tested by luminol-dependent chemiluminescence method. In addition, the patients and donors were examined for malonic dialdehyde. RESULTS: Titers of IgA and IgG of C. pneumoniae antibodies were high in CHD exacerbation. IgM antibodies were not found in the diagnostic titers. Follow-up values of IgA and IgG titers lowered. C. pneumoniae was found in 12 of 15 autopsy specimens. Basal and stimulated indices of leukocytic generation of active oxygen forms in patients with CHD exacerbation were higher than in donors. Later, the generation declined. Malonic dialdehyde was also elevated in the exacerbation and lowered in clinical improvement. A correlation exists between IgA and IgG antibodies titers and chemiluminescence intensity in CHD exacerbation. CONCLUSION: In progression of atherosclerotic process including CHD and its exacerbations CI and free radical processes activate. These may be related showing a feasibility of C. pneumoniae involvement in development of atherosclerosis.

Antibodies, Bacterial↗
PubMed2000

[Enalapril treatment of residual pulmonary hypertension in patients operated rheumatic mitral valve defects].

A pilot trial of efficiency of enalapril maleate in the treatment of residual pulmonary hypertension was made in 22 patients operated for rheumatic mitral valve defects. Degree I, II and III of pulmonary hypertension was registered in 5, 13 and 4 patients, respectively. Thus, the patients had NYHA functional classes III and IV (22.7 and 77.3%, respectively. Enalapril given for 6 months in a mean daily dose 12.3 +/- 1.57 mg/m2 (5-30 mg a day) normalized pressure in the pulmonary artery in 18.2% of patients. 50% of patients showed hypertension degree I, only one female retained hypertension degree III. To the end of the treatment the functional classes were the following: II--in 68.2%, III--in 27.3% and IV--in 4.5%.

Adult↗
PubMed2000

[Program of examination for patients with isolated mitral valve defects to evaluate the degree of pulmonary hypertension].

98 patients with isolated rheumatic mitral valve defects of the heart entered the study. Their central hemodynamics was studied intraoperatively before surgical correction of the defect. The results were compared to those provided by conventional noninvasive methods: chest x-ray, ECG, echo-CG, external respiration function test. Correlation analysis using computer intellect PolyAnalyst v.1.01R helped to design a program and practical nomogram which can quantitatively determine the degree of pulmonary hypertension on the basis of digital values of Rv1 wave amplitude (ECG) and right ventricular cavity size (echoCG).

Adult↗
PubMed2000

[Course of pulmonary hypertension in patients operated for rheumatic mitral heart disease].

AIM: To study changes in pulmonary hypertension in patients with isolated mitral valvular defects of rheumatic etiology after surgical correction and in the early postoperative period. MATERIALS AND METHODS: Central hemodynamics in heart chamber probing before operation and intraoperatively were measured in 98 patients with rheumatic mitral defects (41 males, 57 females, mean age 39.5 +/- 8.74). Manometry before and after the defect correction, intraoperative catheterization (cath. Swan-Ganz) for hemodynamics 24-h follow-up were made. RESULTS: After valvular defect correction 90(91%) patients had residual pulmonary hypertension, stage II-III in 41%. CONCLUSION: Patients operated for rheumatic heart disease complicated by pulmonary hypertension often suffer from residual pulmonary hypertension. This requires pharmacological correction.

Adult↗
PubMed1998

[Efficiency of computed tomography in diagnosis of silicotuberculosis].

The routine methods X-ray study and computed tomography (CT) were compared in a group of patients engaged in fireproof industry. CT yields valuable additional data in early silicotuberculosis, which makes it possible to follow the extent of a silicotuberculous process more completely, to make a better diagnosis of nodal and focal shadows, to identify small decay cavities in the foci and infiltrates. CT is the method of choice in following up patients with silicotuberculosis.

Humans↗
PubMed1995

[Active computer systems for medical education: approach and implementation].

The methodological bases and ways of building and using the new type of the educational computer-aided systems for physicians, the Diagnostic trainer, are discussed in the paper. The user's work on the Diagnostic Trainer proceeds in the form of a game during which the system stimulates clinical cases while the user analyzes them. The Diagnostic Trainer uses its knowledge base for simulations and requires no clinical cases to be prepared beforehand. The Diagnostic Trainer never forces the user to do, but always fixes his/her attention on the available essential points and possible contradictions between the specific clinical case and the user's strategy to make a decision.

Computer-Assisted Instruction↗
PubMed1994

[The mechanisms of the intensification of free radical processes in patients with IHD-stenocardia in relation to its severity].

The ability of leukocytes to generate active oxygen forms and plasmic levels of malonic dialdehyde as indicators of free radical process activity and that of lipid peroxidation (POL), respectively, were investigated in 50 patients with angina pectoris (20 patients with functional class I-II and 30 patients with functional class III-IV) versus 18 donors. The anginal patients are shown to have enhanced POL and free radical processes which appeared correlated with the disease severity. The authors identify factors intensifying free radical processes in anginal patients: platelet inhibition of leukocytic ability to generate active oxygen forms, changes in plasmic levels of IgM, C-reactive protein, serum iron.

Adult↗
PubMed1992

[Effects of blood platelets on generation of free radicals by leukocytes].

The paper is concerned with studies on generation of free radicals by donor leukocytes in plasma rich or poor in platelets. NBT test and chemiluminescence were employed. Platelets are shown to inhibit generation of free radicals. Changes in free radicals generation were studied under stimulation by zymosan and addition of washed platelet fraction. The conclusion is made that platelets inhibit leukocyte generation of free radicals by adsorption factors necessary for this process from plasma.

Blood Platelets↗
PubMed1992

[The interrelationship of doses and the pharmacological effects of cardiac peptides].

Low-molecular weight peptides prepared according to an original procedure from a cattle heart possess a protecting effect on the myocardium during ischemia. Peptides in doses of 10(-7) g/ml and less improve the indexes of contractility function of the isolated heart after total ischemia and correct respiration warranting cardiomyocytes survival during hypoxia. However, in different models high doses of heart peptides (5 x 10(-6) g/ml and more) are shown to inhibit contractility, to stop respiration, the action of the peptides increasing with myocardial ischemia degree.

Animals↗
PubMed1991

[Effects of a polypeptide drug on the state of energy metabolism of myocardial cells in hypoxic and ischemic conditions].

Cordialin, the agent extracted from the heart, is known to inhibit hyperoxidation of succinic acid, increasing NADH oxidation speed in suspension of cardiomyocytes in hypoxia. Cordialin presence in oxygenated cells' suspension oxidating succinate, doesn't change oxygen consumption speed. The results received may be a theoretical basis for cordialin utilization in therapy of myocardial diseases, associated with hypoxia and ischemia. Cordialin utilization may be recommended for the treatment of acute myocardial infarction and for prolongation of time-period for thrombolytic therapy, treatment of IMD, angina and other pathological states, in which oxygen transport disturbance to myocardium cells occurs.

Animals↗