[Evaluation of the indicators of acid-base equilibrium, oxygen and electrolyte blood levels for early diagnosis of hemodynamic disorders after heart surgery].

In 30 patients operated on under extracorporeal circulation the acid-base, oxygen and electrolytes balance parameters were studied in order to evaluate their potentials as additional diagnostic tests for various clinical forms of acute circulatory disorders in the early post-operative period. Cardiac insufficiency is predominantly characterized by a reduced oxygen saturation of mixed venous blood, an increased oxygen arterio-venous gradient and "lactate excess", hypokalemia and hypernatremia in plasma and erythrocytes. Metabolic and gas parameters of acid-base balance cannot be used for the diagnosis of postoperative cardiac insufficiency. In cases of hypovolemia the changes of the laboratory tests data are determined by the compensatory capacities of the human body in response to circulating blood volume deficit.