SOME HEMODYNAMIC PARAMETERS IN UNINTENTIONAL HYPOTHERMIA

Part of Russia's territory is located in cold and temperate climate zones, where people are constantly exposed to the risk of hypothermia and cryotrauma. When exposed to cold, general metabolic processes in the body are inhibited, leading to disruption of the central nervous system, respiratory and other vital functions of the body. Studies by many authors have shown that not a single functional system remains intact during acute hypothermia. Purpose of the study . To identify patterns of changes in central hemodynamics, cardiac activity, vascular parameters depending on the severity and period of general unintentional hypothermia. Research methods . The study included 26 patients of both genders, aged from 18 to 50 years – 2 groups of 13 patients – with mild and moderate (group 1) and with severe (group 2) degree of unintentional hypotermia. Results. In patients with severe hypothermia, a decrease in pulse arterial pressure was recorded from admission to day 7 of observation, compared to patients with mild hypothermia. A decrease in cardiac output was also recorded on the first day of severe hypothermia. Stroke volume and ejection rate were higher in patients with severe hypothermia compared to those with mild and moderate hypothermia. In patients with mild hypothermia, an increase in pulse wave velocity was observed on days 3 and 7 of observation, compared to day 1. Conclusion . The increase in stroke arterial pressure corresponds to adaptive changes in hemodynamics in the post-hypothermic period of general cold injury. In severe hypothermia, pulse pressure and cardiac output are lower, while stroke volume and ejection rate are higher, compared to mild hypothermia. Over time, an increase in pulse wave velocity was observed in patients with mild hypothermia.