Considering beta-endorphin as a sign of tension and adaptation, the changes in its level have been studied during operations and surgery in patients with congenital heart valve defects subjected to cardiopulmonary bypass surgery. The goal of the study was determination of beta-endorphin concentration for the assessment of general anesthesia adequacy. A step-by-step study of beta-endorphin blood concentration, central and peripheral hemodynamics, diuresis, changes in temperature taken in 3 spots, adrenalin, dopamine and noradrenaline blood levels has been performed in 12 patients aged 4 to 17 years. A stable beta-endorphin blood content at all stages of anesthesia and surgery has been established. A correlation has been established between changes in adrenalin and dopamine blood levels, temperature gradient, diuresis intensity and mean BP, on the one hand, and changes in beta-endorphin blood level, on the other hand. Multifactor systemic analysis of the data obtained makes it possible to conclude that beta-endorphin blood level is informative when assessing the adequacy of general anesthesia.
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