Oxygen transport and hemodynamics of stroma-free hemoglobin solutions.

The intravascular persistence of hb-W is significantly longer than of pyridoxylated hb (hb-PLP), however, no significant differences in BV were observed after isovolemic exchange of 20 ml/kg b.w. Even though the oxygen affinity of hb-PLP in vitro was reduced when compared to the affinity of hb-W significant differences in vivo were lacking. The development of hypovolemia and thus the lack of an adequate increase in cardiac output have been recognized as the most relevant causes to explain the changes observed. Neither of the solutions is yet to be recommended for clinical blood replacement therapy.