[The relative critical threshold of erythrocyte hemoglobin concentration in isovolemic hemodilution]

The purpose of our research was register the relative critical threshold of erythrocyte hemoglobin concentration: that criteria, on basis of which was possible to be determined, whether the parameters of red blood for maintenance of oxygen delivery are sufficient in each particular case. Have compared two groups patients afterwards surgical stoppage gastro-intestinal bleeding and urgent intravascular volume replacement; 1) hemotransfusion was accompanied decrease of concentration patient's lactate level; 2) hemotransfusion was not accompanied decrease of concentration patient's lactate level. Have generated the algorithm of indications for transfusion of homologous blood in kind pyramid, in basis are incorporated sensitive, but underspecifically symptoms: the decrease of hemoglobin concentration, especially less 6 g/dl; the decrease of oxygen pressure, degree of hemoglobin saturation with oxygen in venous blood; the increase of blood lactate level; the relative increase cardiac output for account frequency of stroke volume and/or value of stroke volume; positive "oxygen cost" of hemotransfusion.