[Approaches to the choice of control group for a pathomorphological study of the heart]. 
It is generally accepted that an optimal control group for pathomorphological studies of the heart should be constituted by individuals who died from a craniocerebral injury without near-death experience.  Polarization microscopy is a principal tool for the assessment of pathomorphological characteristics of myocardium.  The presence of ethanol in the blood of a dead individual is associated with enhanced permeability of vascular walls, venous plethora, sludge phenomenon, microcirculatory thrombosis, perivascular and intermuscular oedema but does not on the whole interfere with the objective evaluation of microscopic images of the cardiac muscle.