[Interrelations between blood circulation and the activity of the sympathetic-adrenal system in infants with acute pneumonia and its suppurative complications].

: The interrelationship was established between circulation and activity of the sympathoadrenal system (SAS) in 71 children with acute complicated pneumonias. In children with compensatory hyperdynamia and venous supply deficiency the hyperactivity of the SAS with a moderate prevailing of the sympathetic link was a compensatory reaction. In hemodynamic situations due to the reduction of heart pump function (heart failure and its threat) and to excess peripheral resistance, alterations in the SAS marked by its depletion in the former case and by remarkable predominance of the sympathetic link in the latter one were found to be primary ones in the pathogenesis of the formation of the disorders under consideration. In pathologic hyperdynamia, the hyperactivity of the adrenal link, being compensatory in its nature, acquired the pathologic character whereby aggravating the circulatory abnormalities.