We had recently 10 cases of intraoperative autotransfusion with arterial blood and concomitantly normovolemic hemodilution with Hartmanns solution and Rheomacrodex® which amount 6 d to half the removal of arterial blood through a cannulated radial artery. We observed mean arterial pure, heart rate, central venous pressure, hematocrit and arteriovenous oxygen content difference compared to controls, just after removal of arterial blood with concomitant hemodilution and after autotransfusion. There were no changes of the above observations except for hematocrit values during the experiment. We recommend intraoperative autotransfusion with arterial blood and normovolemic hemodilution as a safe technique.