By means of water deprivation primary- and secondary-compensated and decompensated degrees of dehydration have been caused in 24 rats. Electron microscopical investigation has demonstrated a more pronounced granularity of cardiomyocytes in the left than in the right cardiac auricles. During the alimentary dehydration granularity of the atrial cardiomyocytes in the right auricles increases at the primary- and secondary-compensated degrees of dehydration, in the stage of decompensated dehydration it decreases, the character of distribution of the secretory granules, however, shows certain processes of exhaustion. Granularity of the atrial cardiomyocytes in the left auricles during alimentary dehydration of the organism does not change. Changes of the endocrine apparatus in the atrial cardiomyocytes occur against the background of microcirculatory disturbances in both auricles of the heart and are combined with dystrophic changes in cardiomyocytes.
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