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Biomedical subjects

V V Kovtun

Publications and source records attributed to V V Kovtun.

At least 19 recordsLinked to original sources
PubMed1996

High resolution electrocardiographic abnormalities as possible indexes of electric instability of the myocardium.

OBJECTIVE: To evaluate the signal-averaged high resolution electrocardiogram in the time domain and the frequency domain in various cardiac patients. DESIGN: Patients in seven clinical diagnostic categories were compared with a healthy control group. PATIENTS AND METHODS: The control group consisted of 70 clinically healthy persons. The 525 cardiac patients were divided as follows: group 1, 29 patients with surgically corrected mitralvalvular disease; group 2, 42 postinfarction patients with-bypass grafting; group 3, 57 patients with ventricular tachycardia; group 4, 198 patients with medically treated angina; group 5, 63 patients with hypertension; group 6, 46 patients with paroxysmal atrial fibrillation; and group 7, 90 patients with acute pulmonary insufficiency. The Frank orthogonal leads were used to derive the signal-averaged electrocardiogram in the usual manner by averaging over 200 complexes. Time domain and frequency domain data were recorded for both the P wave and the QRS complex. RESULTS: Ventricular late potentials were found most often in patients with postinfarction ventricular tachycardia (59%). The prevalence of ventricular late potentials in the mitral valvular disease group increased from 45% to 70% after surgery; in the bypass grafting group it also increased. Spectral temporal mapping revealed a substantial decrease of the total spectral power in the bypass grafting group, to 129 +/- 19 microV2/Hz compared with the preoperative period (205 +/- 16 microV2/Hz). The high frequency power decreased, so the ratio of low frequency to high frequency power increased. A significant correlation was found between the root-mean-square signal in the last 40 ms of the QRS complex and each of the amplitude parameter, the frequency domain localization and time domain localization of the power density peaks. CONCLUSIONS: High resolution electrocardiography including time domain and frequency domain analyses may prove helpful in diagnosis and management.

Action Potentials↗
PubMed1991

[Use of a Soviet-made device for recording late ventricular potentials].

Late ventricular potentials (LVP) were detected with an ECG signal-averaging installation developed at the Institute of Radio Engineering and Electronics, USSR Academy of Sciences. A total of 103 patients were examined: 33 with sustained ventricular tachycardia (VT), 30 with unsustained VT and high-grade ventricular premature contraction, 20 with coronary heart disease, postinfarction cardiosclerosis without arrhythmias and 20 apparently healthy subjects (controls). LVPs are the most susceptible to sustained VT in the presence of postinfarction cardiosclerosis (77%), their specificity is lower (70%). LVPs are a low sensitive marker (35%) for sustained idiopathic VT. In unsustained VT and high-grade premature ventricular contraction, LVPs were recorded infrequently in 1 (3%) of the 30 patients.

Action Potentials↗
PubMed1990

[Experience in the use of external fixation devices in the treatment of limb bone fractures, their sequelae and complications].

The present paper reflects the experience of treatment of 243 patients with utilization of external fixation apparatus. Two methods of extrafocal perosseous osteosynthesis were employed: traction wire apparatus were utilized in 217 (89.3%) victims, rod apparatus--in 26 (10.7%). The construction of employed traction wire apparatus and method of its application have been described. Remote results of treatment have been followed in 194 (79.8%) patients. Fracture consolidation has been observed in 187 (77%) patients. Complications, registered in the process of application of apparatus of different constructions, have been analyzed. The authors have come to a conclusion about high efficiency of the employed apparatus, indicated obvious advantages of the rod apparatus.

Adolescent↗
PubMedDate not supplied

[Late potentials of the heart ventricles and a method of spectral mapping for evaluating the action of dalargin in intensive therapy].

The data of 114 examinations of 38 patients with respiratory failure of different genesis have been presented. The method used was that of averaging the ECG signal with analysis of late ventricular potentials and parameters of spectral mapping, as well as analysis of the R-R intervals. The patients were examined initially, 30-45 min after intravenous injection of 1 mg dalargin and 16-20 hours later. The results have shown that there were differences in the changes of a number of basic characteristics of the QRS complex spectrum. In 18 cases (21%) signs of late potentials have been recorded, 14 of them (78%) in the group with decreased total spectral density. A shift of extremums by the beginning of QRS was observed. Statistical and spectral characteristics of the R-R intervals changed in one direction. It has been shown that dalargin has a complex effect on electrophysiological myocardial properties. The use of the method of ECG signal averaging and its different modifications broadens considerably the quality of evaluation of the drug effect in the heart. The technique of spectral-time mapping simplifies the diagnosis of late potentials and elucidates their inner structure.

Adult↗