INDIVIDUAL VARIABILITY OF THE STRUCTURE OF THE CONDUCTING SYSTEM OF THE HUMAN HEART

Abstract

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Background. Development of surgical treatment methods of arrhythmia and congenital heart defects to a large extent by the correct assessment of the cardiac conducting system (CCS) structural variability. Aim. The aim of this work is to study individual differences in position, size and shape of parts of the CCS atrioventricular portion in terms of age and with regard to the cardiac structure. Material and Methods. By applying generally accepted morphological methods in 501 heart specimens of fetuses, children and adults of both sexes and different ages, studied the position, size and configuration of the atrioventricular node, AV bundle and its branches with regard to the structure of cardiac ventricles and portions of the interventricular septum (sinus, trabecular, conica). Results and Discussion. In prenatal and postnatal periods of ontogenesis are similar variants of the structure of the ventricles of the heart with certain proportions of the linear dimensions inflow and outflow sections, parameters parts of interventricular septum (IVS). Each of options of structural organization of heart ventricles and its IVS corresponds to set of specific features of portions of cardiac conducting system, signifying change of the positional angles, linear dimensions and shape. It was to the AV bundle and sine of the IVS of the correlation pair. Conclusions. Form of the sine part, ratio of its parameters can be used as a criterion for estimating the length of preventive AV bundle without its isolation.