The incidence of allogeneic blood transfusion in cardiac surgery depends on the institution and not on the surgical procedure. A common threshold value of hemoglobin for the transfusion of blood trigger even for comparable procedures could not be detected among the centers. Especially in female patients, there was a wide variation in allogeneic blood transfusion. Autologous blood predonation reduces blood requirement significantly, however, it is practiced with variing intensity. The data set did not include information about transfusion regimen in the postoperative period, thus, these data do not allow to draw conclusions for the whole perioperative period.

A retrospective comparison was made between two groups of 50 adult patients who underwent open-heart surgery in an operating suite with two adjacent rooms, one of which was equipped with a laminar flow enclosure. Core and body surface temperatures were measured at 15-min intervals for the 1st h after commencement of surgery. Patients in a laminar flow enclosure showed a significantly greater decrease in core temperature with time. Possible means of counteracting this are suggested.