1.
Retrograde autologous priming of the cardiopulmonary bypass circuit reduces blood transfusion in small adults: a prospective, randomized trial
Hou X, Yang F, Liu R, Yang J, Zhao Y, Wan C, Ni H, Gong Q, Dong P
European Journal of Anaesthesiology. 2009;26((12):):1061-6.
Abstract
BACKGROUND AND OBJECTIVE Extreme haemodilution occurring with cardiopulmonary bypass imposes a primary risk factor for blood transfusion in small adult cardiac surgical patients. Priming of the cardiopulmonary bypass circuit with patients' own blood [retrograde autologous priming (RAP)] is a technique used to limit haemodilution and reduce transfusion requirements. We designed this study to evaluate the effects of RAP on reducing perioperative blood transfusion in small adults. METHODS One hundred and twenty patients with a body surface area of less than 1. 5 m undergoing first-time, nonemergency cardiac surgery were randomized to either the standard priming group or the RAP group. All patients followed strict transfusion criteria. Homologous transfusion, haematocrit, plasma colloid osmotic pressure and postoperative clinical outcomes were evaluated perioperatively. RESULTS Patient characteristics and operative parameters were equal for patients in both groups. With autologous priming, a mean volume of 614. 8 +/- 138. 8 ml of priming solution was replaced with autologous blood. This allowed a significantly higher haematocrit value during cardiopulmonary bypass (P < 0. 05). Red blood cell transfusion was necessary in 83. 3% of patients of the standard priming group on pump, whereas only 26. 7% of patients of the RAP group required transfusion (P < 0. 01). The overall transfusion rate of the RAP group was significantly less than that in the standard priming group during the hospitalization (90. 0 vs. 50. 0%, P < 0. 01). Amongst patients who received transfusion on pump, the number of homologous units of packed red blood cells was less in the RAP group than that in the standard priming group intraoperatively and perioperatively (0. 94 +/- 0. 32 vs. 1. 48 +/- 0. 68 units, P = 0. 03; 1. 24 +/- 0. 54 vs. 1. 69 +/- 0. 69 units, P = 0. 15). Ten minutes after aortic cross-clamp, colloid osmotic pressure was reduced by 39. 7 +/- 2. 8% in the standard priming group and by 28. 6 +/- 3. 2% in the RAP group (P < 0. 05). Clinical outcomes were similar with respect to pulmonary, renal and hepatic function, length of ICU stay and hospital stay. CONCLUSION RAP resulted in a significant decrease in intraoperative haemodilution and conserved the use of blood. This technique should be considered for patients with a small body surface area (<1. 5 m) undergoing open heart surgery.
2.
Evaluation of the quality of processed blood salvaged during craniotomy
Liang H, Zhao Y, Wang D, Wang B
Surgical Neurology. 2009;71((1):):74-80.
Abstract
BACKGROUND The objective of the study was to evaluate the quality of salvaged blood retrieved during craniotomy after the processing by autotransfusion devices and to compare the processing effects of 2 autotransfusion devices: ZITI-2000 (Jingjing Medical Equipment Limited, Beijing, PR China) and BRAT 2 (Cobe Cardiovascular Inc, Division of Sorin Biomedica Arvada Co, Arvada, Colo). METHODS Twenty-four patients scheduled for elective craniotomy were randomly allocated into 2 groups, and 1 of the 2 autotransfusion devices (ZITI-2000 and BRAT 2) was used for each group. The blood samples were collected, washed, and tested for select blood components. The efficacy of centrifugation and washing was assessed by determining the ER of PLTs, WBCs, K+, and fHb. The morphology of the washed erythrocytes and the 2-week-old PRBCs was evaluated by means of SEM. RESULTS Extensive hemolysis was observed in the collected blood of both ZITI-2000 and BRAT 2 groups, with fHb being 464. 8 +/- 111. 6 and 459. 0 +/- 91. 6 mg/dL, respectively. The ERs of PLTs, WBCs, K+, and fHb were >35%, >80%, >90%, and >90%, respectively. Although some shape-changed red cells were observed in the washed blood, discocytes were the dominant form in both groups, with the percentages of discocytes being 58. 0% +/- 8. 0% and 59. 7% +/- 8. 3%, respectively. A greater number of shape-changed red cells were found in 2-week-old PRBCs (P < . 01). CONCLUSION For craniotomies, the quality of salvaged blood processed by both devices (ZITI-2000 and BRAT 2) is equally satisfactory. Although extensive hemolysis is noted in the salvaged blood, IBS can be effectively and safely used.