Biomedical subjects

B Shakhov

Publications and source records attributed to B Shakhov.

22 records · Page 2Linked to original sources

PubMed1978

[Precordial electrocartography (mapping) in cardiac infarct].

After a detailed literature survey the authors share the results from the precordial electromapping with the registration of 30 points upon the chest in 34 patients with ischemic heart disease (30 with transmural infarction and 4 with intermediary syndrome). The following indices were followed up: sigmaST (the sum of the elevation of ST segment measured at 60 msec of the S deflection recording) and the index nST (the sum of the points with an elevation greater than 0.1 mV/1 mm). Both indices well correlate to the level of blood creatine phosphokinase, determined 24 hours after the examination. Due to the close degree of correlation dependence, the two indices are interchangable for the practice. The precordial electromapping reflects the degree of extent of the "myocardial hypoxia" as well as the degree of the disturbed biological activity of the tissues, affected by the myocardial infarction.

Acute Disease↗

PubMed1977

[Diagnostic value of Frank's corrected orthogonal electrocardiogram].

The changes in the corrected orthogonal electrocardiograms of 411 patients were analyzed: 134 with right ventricle loading, 137 with left ventricle loading and 140 with myocardial infarction (chronic phase). On the base of sensitivity and specificity criteria the indices SXmV, SXmsec and QZmV for the patients with right ventricle loading and RXmV and RZmV for the patients with left ventricle loading proved to be with the highest diagnostic value. Sensitivity is within 19% to 61%. Sensitivity is within 85% and 95% in patients with myocardial infarction (chronic phase), for the different indices depending on the infarction zone. The comparative analyses of the indices of the corrected orthagonal Frank electrocardiogram and the standard electrocardiogram (12 leads) give a certain preference to the indices of the standard electrocardiography.

Cardiomegaly↗

PubMed1977

[Spatial analysis of the electrophysiological changes in ventricular loading].

Space analysis methods of the changes in heart electromotive force are described (EMF). The size of the space vector in millivolts, azimuth and elevation are obtained by formula substitution in the mathematical analysis. The same values, in graphis analysis, are obtained by the "Circle for space vectors determination", proposed by the authors. Axial and space analysis of the changes in the electrogenesis of right ventricle was performed in 27 patients with pulmonary stenosis, confirmed by catheterization, on the base of the corrective orthogonal electrocardiogram according to Frank. The axial indices, indicating the size of the forces directed to the right (Sxmv) and forward (Qzmv) are compared as well as the size, elevation and azimuth of the maximal space vector, directed to the right (Vmax.sp-x) and forward (Vmax.sp-z). The index from the axial analysis (sensitivity 62%, r = 0.65) shows a priority for the forces, directed to the right. The priority is on the side of the indices from space analysis (sensitivity 33%, r = 0.78) in case of forces directed forward. There is no statistically significant difference in the diagnostic value of the two methods.

Adult↗

PubMed1977

[Atypical hypoxic changes in the T wave].

Three patients with clinical diagnosis of myocardial infarction are described, whose cardiograms are characterized by a transitory positivation of the negative T-waves. The confrontation of those changes with the clinical picture reveals that the transitory positivation of the T-wave coincides with the clinical and paraclinical signs of intensification of the myocardial hypoxia (pain, collapse, enzyme positivation). The possible electrophysiological mechanisms are discussed that could explain the transitory positivation of the negative T-waves, as a manifestation of the intensified ischemia.

Acute Disease↗