The gastrointestinal tract is constantly exposed to various physical and chemical factors. In the intestine, the contact of bacteria and the epithelium largely depends on mucus, which mainly consists of highly glycosylated mucin-2 secreted by goblet cells in the epithelium. Goblet cells are located along the entire length of the small and large intestine and are responsible for the production and maintenance of a protective layer of mucus through the synthesis and secretion of high-molecular glycoproteins known as mucins. The article presents data on the embryogenesis of the small intestine in general and goblet cells, in particular, a literary review of the role of goblet cells in the morphology of the intestinal tract, the functional aсtivity of their secretion is carried out. Due to the unique nature of this highly polarized exocrine cell, the cellular mechanisms by which goblet cells  secrete their products are discussed.

Mitral regurgitation followed by acute coronary syndrome is a dangerous pathological condition which can to threat patient. Precise evaluating severity of mitral regurgitation followed by acute coronary syndrome could be difficult. Management of patients depends on severity of mitral regurgitation. Current review describes role of echocardiographic parameters in assessment of severity of mitral regurgitation.

In this article, a new look at cardiac rhythm and conduction disorders in children is outlined. These deviations, along with congenital malformations, have taken one of the first places in the structure of cardiovascular pathologies. This is one of the most serious problems that stands at the intersection of cardiology and pediatrics. The frequency of occurrence of severe forms of arrhythmias reaches 1:5000 of the child population, and life-threatening arrhythmias – 1:7000. Treatment of cardiac arrhythmias and conduction disorders is one of the most difficult sections of clinical pediatrics. There are medicinal and non-medicinal methods. According to experimental new data, nootropics, in particular the drug Cortexin, along with cardiotrophic drugs, form the basis of neuro-metabolic therapy and correction of children's arrhythmias.