[Comparative ultrastructural analysis of capillaries in the conducting and contracting myocardium of the heart sino-auricular region in suddenly died patients with coronary artery disease and alcoholic cardiomyopathy].

The EM study of capillaries in the sinus node (SN) and adjacent working myocardium has been performed in 12 patients who ceased a sudden coronal cardiac death at the age 34-69 years and in 8 patients with alcoholic cardiomyopathy who suddenly died at the age 32-60 years. Quantitative evaluation of the density of the capillaries and their diameters in the myocardium of this region was made. Acute and chronic changes were observed in the capillaries of SN and working myocardium. Possible causes of the ultrastructural pathology of the microvascular system in the sinoauricular region of the heart in persons who died suddenly are discussed.