RESUMO
Myocardial infarction is one of the most serious and widespread diseases in the world. In this work, a minimally invasive method for simulating myocardial infarction in mice is described in the Russian Federation for the very first time; the procedure is carried out by ligation of the coronary heart artery or by controlled electrocoagulation. As a part of the methodology, a series of anesthetic, microsurgical and revival protocols are designed, owing to which a decrease in the postoperational mortality from the initial 94.6 to 13.6% is achieved. ECG confirms the development of large-focal or surface myocardial infarction. Postmortal histological examination confirms the presence of necrosis foci in the heart muscles of 87.5% of animals. Altogether, the medical data allow us to conclude that an adequate mouse model for myocardial infarction was generated. A further study is focused on the standardization of the experimental procedure and the use of genetically modified mouse strains, with the purpose of finding the most efficient therapeutic approaches for this disease.
RESUMO
Material for this study from 61 patients (thyroid papillary carcinoma) is shown to represent a heterogenic group of tumors differing from each other morphologically, molecular-biologically and histogenetically. The most malignant were long-cell and B-cell variants and the least malignant--a follicular variant. 81% of the tumors had neuro-endocrine differentiation and their malignant potential was higher compared to tumors without this differentiation.