术中自体血回输与输注异体血对脊柱手术术后血液流变学的影响

目的 对比术中自体血回输和输注异体血对脊柱手术病人血液流变学（凝血功能）的影响,进一步探讨术中血液回收的安全性和可行性。方法 选择2015年1月至2016年12月我院收治的术前实验室检验正常、无凝血功能异常且未接受抗凝治疗、非恶性肿瘤、术中血液无污染的骨科脊柱开放性手术病人100例。严格遵守献血与输血的伦理准则分组：①自体血液回输组（自体组）,即术中回输经洗涤处理的自体血,男22例,女28例;②异体输血组（异体组）,即行异体输血,男23例,女27例。两组病人一般资料比较,差异均无统计学意义（均P＞0.05）。同时进行血液流变学项目监测,并对比输血对病人凝血功能的影响。结果 自体组的术中回输自体血量为（289.4±55.7） ml,少于异体组的异体输血量［（396.5±141.1） ml］,两者比较差异有统计学意义（t=4.992,P＜0.05）。术后第3天两组病人的红细胞压积,自体组为31.00%±5.84%,小于异体组的34.25%±6.15%,两组比较差异具有统计学意义（t=2.710,P=0.007）;两组病人其余血液流变学参数比较,差异均无统计学意义（均P＞0.05）。术后第7、14天,两组病人各项血液流变学参数比较,差异均无统计学意义（均P＞0.05）。结论 自体血回输对血液流变学参数的影响与输注异体血相比无显著差异,可广泛应用于临床。     

Autologous blood donation in cardiac surgery: reduction of allogeneic blood transfusion and cost-effectiveness

OBJECTIVE: The purpose of this study was to assess transfusion requirements in patients undergoing cardiac surgery with and without autologous blood donation and to calculate the costs of predonation from the hospital perspective. DESIGN: Observational study. SETTING: Single university hospital. PARTICIPANTS: Four thousand three hundred twenty-five patients undergoing elective cardiac surgery with and without autologous blood donation. INTERVENTIONS: Eight hundred forty-nine patients (20%) underwent autologous blood donation, whereas 3,476 (80%) did not. Perioperative allogeneic blood transfusion was recorded as the primary endpoint. To avoid selection bias, patients were stratified according to their preoperative risk score. A decision model was derived from acquired data for the optimization of autologous blood donation. MEASUREMENTS AND MAIN RESULTS: Allogeneic blood transfusion rate was 13% in patients with predonation versus 48% without predonation (p < 0.05). This difference remained statistically significant even after risk stratification. The predonation of 1, 2, or 3 units reduced the probability of receiving allogeneic blood to 24%, 14%, and 9%, respectively. An efficient program of predonation within the department of anesthesiology allowed keeping the costs of predonation low. Decision-tree analysis revealed that predonation of 2 autologous units of blood saved the most allogeneic blood for the smallest increase in costs. Incremental cost for male patients predonating 2 units was dollars 33 (US), whereas for females predonation could be done at no extra cost in comparison to patients without predonation. CONCLUSION: Autologous blood donation significantly reduces allogeneic blood requirement in cardiac surgery. If adjusted for diagnosis and gender, autologous blood donation is a cost-effective alternative to reduce allogeneic blood consumption.     

Factors influencing blood loss and allogeneic blood transfusion practice in craniosynostosis surgery

Objective/Aims: To identify factors influencing perioperative blood loss and transfusion practice in craniosynostotic corrections. Background: Craniosynostotic corrections are associated with large amounts of blood loss and high transfusion rates. Methods: A retrospective analysis was performed of all pediatric craniosynostotic corrections during the period from January 2003 to October 2009. The primary endpoint was the receipt of an allogeneic blood transfusion (ABT) during or after surgery. Pre‐, intra‐, and postoperative data were acquired using the electronic hospital registration systems and patients’ charts. Results: Forty‐four patients were operated using open surgical techniques. The mean estimated blood loss during surgery was 55 ml·kg^?1. In 42 patients, red blood cells were administered during or after surgery with a mean of 38 ml·kg^?1. In 23 patients, fresh frozen plasma was administered with a mean of 28 ml·kg^?1. A median of two different donors per recipient was found. Longer duration of surgery and lower bodyweight were associated with significantly more blood loss and red blood cell transfusions. Higher perioperative blood loss and surgery at an early age were correlated with a longer duration of admission. Conclusions: In this study, craniosynostotic corrections were associated with large amounts of blood loss and high ABT rates. The amount of ABT could possibly be reduced by appointing a dedicated team of physicians, by using new less‐invasive surgical techniques, and by adjusting anesthetic techniques.     

Use of intravenous tranexamic acid to reduce allogeneic blood transfusion in total hip and knee arthroplasty: a meta-analysis

Total hip or knee arthroplasty is associated with significant blood loss. Techniques such as the use of antifibrinolytics or desmopressin, or normovolaemic haemodilution have been used to reduce the need for allogeneic blood transfusion. Tranexamic acid has been used to reduce blood loss and transfusion requirement for total hip and knee arthroplasty, with variable results. This meta-analysis aims to evaluate whether intravenous tranexamic acid, when compared with placebo, reduces blood loss and transfusion requirement in total hip and knee joint replacement surgery and whether it might increase the risk of thromboembolic complications. The literature search was based on MEDLINE, EMBASE, Cochrane Controlled Trials Register, and information from the pharmaceutical company that produces tranexamic acid (Pharmacia-Upjohn). We identified 15 clinical trials and 12 were considered suitable for detailed data extraction. Tranexamic acid reduces the proportion of patients requiring allogeneic blood transfusion (OR 0.16, 95% CI: 0.09-0.26), total amount of blood loss (WMD 460 ml, 95% CI: 274-626 ml), and the total number of units of allogeneic blood transfused (WMD 0.85 unit, 95% CI: 0.36-1.33). Tranexamic acid does not increase the risk of thromboembolic complications such as deep vein thrombosis, pulmonary embolism, thrombotic cerebral vascular accident, or myocardial infarction (OR 0.98, 95% CI: 0.45-2.12). Intravenous tranexamic acid appears effective and safe in reducing allogeneic blood transfusion and blood loss in total hip and knee arthroplasty.     

Reducing perioperative blood loss and allogeneic blood transfusion in patients undergoing major spine surgery

At present, individual techniques, including intraoperative acute normovolemic hemodilution, use of tranexamic acid, use of intrathecal morphine, proper positioning, and modification of operative techniques, seem most promising for reducing perioperative blood loss and allogeneic blood transfusion in patients undergoing major spine surgery. Other techniques including preoperative autologous predonation; mandatory discontinuation of use of antiplatelet agents; intraoperative and postoperative red-blood-cell salvage; use of aprotinin, epsilon-aminocaproic acid, recombinant factor VIIa, or desmopressin; induced hypotension; avoidance of hypothermia; and minimally invasive operative techniques require additional studies to either establish their effectiveness or address safety considerations.     

Perflubron emulsion (AF0144) augments harvesting of autologous blood: a phase II study in cardiac surgery

OBJECTIVE: To assess tolerance and preliminary efficacy of a perfluorocarbon emulsion (AF0144) used with acute normovolemic hemodilution to reduce allogeneic blood transfusion for patients undergoing coronary artery bypass graft (CABG) surgery with cardiopulmonary bypass (CPB). DESIGN: Controlled, single-blind, parallel-group phase II dose escalation trial. SETTING: Single-institution university medical center. PARTICIPANTS: Adult patients undergoing elective CABG surgery (n = 36). INTERVENTIONS: A calculated volume of autologous whole blood was harvested for each patient with a target on-bypass hematocrit of 20% to 22%. Placebo, low-dose (1.8 g/kg) AF0144, or high-dose (2.7 g/kg) AF0144 was infused. During CPB, blood was transfused at protocol-defined triggers (hematocrit <15%, PvO(2) <30 mmHg, SvO(2) <60%). After CPB, all autologous whole blood was reinfused. Allogeneic red blood cells were transfused if a trigger was reached. MEASUREMENTS AND MAIN RESULTS: Safety assessments (vital signs, hematology, blood chemistry, coagulation, and adverse events) were monitored through postoperative day 21. Efficacy endpoints included percentage of patients reaching a transfusion trigger and number of allogeneic units of red blood cells transfused. During CPB, <25% of subjects reached a transfusion trigger. During hospitalization, significantly fewer (p < 0.01) high-dose subjects (33%) reached a trigger than did control patients (91%). Allogeneic red blood cell transfusion did not differ significantly among groups. Safety assessments indicated AF0144 was well tolerated. CONCLUSION: The data suggest that AF0144 when used with acute normovolemic hemodilution is well tolerated and may be effective when used to enhance oxygen delivery for patients undergoing CABG surgery. Confirmation of safety and efficacy in a larger phase III clinical trial is warranted.     

Polymerized bovine hemoglobin solution as a replacement for allogeneic red blood cell transfusion after cardiac surgery: results of a randomized,double-blind trial

BACKGROUND: Blood loss leading to reduced oxygen-carrying capacity is usually treated with red blood cell transfusions. This study examined the hypothesis that a hemoglobin-based oxygen-carrying solution can serve as an initial alternative to red blood cell transfusion. METHODS: In a randomized, double-blind efficacy trial of HBOC-201, a total of 98 patients undergoing cardiac surgery and requiring transfusion were randomly assigned to receive either red blood cell units or HBOC-201 (Hemopure; Biopure Corporation, Cambridge, Mass) for the first three postoperative transfusions. Patients were monitored before and after transfusion, at discharge, and at 3 to 4 weeks after the operation for subsequent red blood cell use, hemodynamics, and clinical laboratory parameters. RESULTS: The use of HBOC-201 eliminated the need for red blood cell transfusions in 34% of cases (95% confidence interval 21%-49%). Patients in the HBOC group received a mean of 1.72 subsequent units of red blood cells; those who received red blood cells only received a mean of 2.19 subsequent units (P =.05). Hematocrit values were transiently lower in the HBOC group but were similar in the two groups at discharge and follow-up. Oxygen extraction was greater in the HBOC group (P =.05). Mean increases in blood pressure were greater in the HBOC group, but not significantly so. CONCLUSION: HBOC-201 may be an initial alternative to red blood cell transfusions for patients with moderate anemia after cardiac surgery. In a third of cases, HBOC-201 eliminated the need for red blood cell transfusion, although substantial doses were needed to produce this modest degree of blood conservation.     

Cell salvage does not minimize perioperative allogeneic blood transfusion in abdominal vascular surgery: a systematic review

PURPOSE: To determine whether the use of cell salvage reduces the proportion of patients receiving at least one unit of allogeneic packed red blood cells during the perioperative period of an elective vascular surgery. SOURCE: We identified all relevant articles through the combined use of electronic searches of the MEDLINE and EMBASE databases, the Cochrane library as well as hand searching of all randomized clinical trials and review articles. The electronic search included articles published between 1966 and April 2001. The search included textword searches using "autotransfusion," "cell salvage," "device," or Medical Subject Headings "autologous blood transfusion" or a "randomized controlled trials" filter. PRINCIPAL FINDINGS: Five randomized controlled trials (RCT) were identified involving cell salvage and vascular surgeries. In infra renal abdominal aortic aneurysm surgery the risk ratio (the risk of receiving at least one unit of allogeneic red cells) was 0.37 [95% confidence intervals (CI) of 0.06 to 2.36]. In elective aorto-femoral bypass surgery the risk ratio was 0.97 (95% CI of 0.66 to 1.42). The pooled risk ratio for cell salvage in vascular surgery was 0.67 (95% CI of 0.35 to 1.28). CONCLUSION: Cell salvage, a commonly used technique to recover red cells from the operative field, has been the subject of several studies in vascular surgery. There is insufficient evidence to recommend the routine use of cell salvage in elective abdominal aortic aneurysm and aorto-femoral bypass surgeries. A large RCT would elucidate whether cell salvage is effective as a blood conservation technique.     

Assessment of intraoperative blood transfusion practice during elective non-cardiac surgery in an Indian tertiary care hospital

Background. We assessed appropriate intraoperative use of wholeblood during elective surgery. Methods. This prospective observational audit by a team of anaesthetistsover 3 months in a multi-speciality tertiary care teaching hospitalused strict preset criteria to evaluate the use of blood transfusionduring elective surgery by anaesthetists. The criteria usedto evaluate the rate of appropriate transfusion were haemoglobinless than 8 g dl^–1, haemoglobin less than 10 g dl^–1in patients with medical co-morbidities and blood loss greaterthan 20% of blood volume when more than 1000 ml. Results. The overall rate of appropriate use of blood was 40.7%;it was inappropriate in 19.2% of cases (haemoglobin >11 gdl^–1). The primary trigger was low haemoglobin (measuredintraoperatively or derived from blood loss). Patients in whomhaemoglobin was measured intraoperatively had a significantlyhigher appropriate use of blood (P<0.05). There was a reductionin blood use over the 3-month audit period (P<0.05). Conclusions. Current intraoperative blood use is sub-optimal.Intraoperative haemoglobin estimation is an effective and simplemeasurement to improve appropriate use of blood. The indicationfor transfusion should be recorded in the case notes. Br J Anaesth 2003; 91: 586–9     

Compatibility of different colloid plasma expanders with perflubron emulsion: an intravital microscopic study in the hamster

BACKGROUND: Perfluorocarbon-based oxygen carriers have been proposed as an adjunct to autologous blood conservation techniques during elective surgery. To date, the effects of perfluorocarbon emulsions at the microcirculatory level have not been studied extensively. In this study the effects of perflubron emulsion on the microcirculation after acute normovolemic hemodilution (ANH) were investigated using different colloid plasma expanders. METHODS: The dorsal skin fold chamber model and intravital fluorescence microscopy were used for analysis of the microcirculation in the thin striated skin muscle of conscious hamsters (body weight, 40-60 g). Measurements of microvascular perfusion and leukocyte adhesion (n = 6 animals per experimental group) were made before and at 10, 30, and 60 min after ANH (to hematocrit 0.3) with either 6% hydroxyethyl starch 200/0.6 (HES), 3.5% gelatin, 5% human serum albumin (HSA), or 6% dextran 60 (DX-60) followed by intravenous injection of 3 ml/kg body weight of a 60% weight/volume perfluorocarbon emulsion based on perflubron (perfluorooctyl bromide) emulsified with egg yolk lecithin. RESULTS: Acute normovolemic hemodilution with HES, gelatin, or HSA followed by injection of perflubron emulsion elicited no alterations of local microvascular perfusion or leukocyte-endothelium interaction as assessed in arterioles and postcapillary venules. However, ANH with DX-60 followed by injection of perflubron emulsion led to a significant reduction of erythrocyte velocity in postcapillary venules and an increase in venular leukocyte sticking that was never observed with DX-60 alone. CONCLUSIONS: Hydroxyethyl starch, gelatin, and HSA are compatible with perflubron emulsion in the setting of ANH. Only DX-60 appeared to be incompatible with perflubron emulsion, as evidenced by impairment of capillary perfusion.     

Predictors of intra-operative blood loss and blood transfusion in orthognathic surgery: a retrospective cohort study in 92 patients

Background

Patients undergoing orthognathic procedures can require blood transfusions. The objectives of this study were to evaluate the predictors of intra-operative blood loss in patients undergoing orthognathic procedures and the transfusion rates and practices of our institution.

Materials and methods

This retrospective study included 92 patients who underwent the following four types of orthognathic procedures: Group 1, bimaxillary; Group 2, bimaxillary with bone grafts; Group 3, LeFort I osteotomies; and Group 4, LeFort I osteotomies with bone grafts. The intra-operative blood loss, operative time, age, gender and pre- and post-operative HGB and HCT were assessed.

Results

The mean blood loss for all groups was 650±397.8 mL, and there were differences in blood loss between the four groups (p = 0.211). The mean operative time was 5 hours and 32 minutes. There were no differences in intra-operative blood loss between the genders or the BMI categories. The operative time was moderately correlated with the intra-operative blood loss (p < 0.001, r =0.332). Eighteen of the 92 patients (19.5%) received blood transfusions. The mean intra-operative blood loss was higher among the patients who received transfusions (p < 0.001).

Conclusions

The only predictor of intra-operative blood loss was operative time. The observed transfusion rate was higher than those that have been reported for similar procedures; thus, our institution needs to revisit our transfusion policy and use more time-efficient techniques in the operating room.

     

结、直肠肿瘤患者围术期输血与术后感染的关系

目的 探讨结、直肠肿瘤患者围术期输血与术后感染之间的关系。方法 收集213例于2001年在中山大学附属第一医院外科一区行结、直肠肿瘤根治术的病例,通过多因素分析校正了混杂因素的影响后,判断围术期输血与术后感染的关系。结果 输血的患者术后感染发生率明显高于未输血的患者(P<0.01)。在校正了对输血及术后感染均有影响的混杂因素的影响后,输血与不输血的患者发生术后感染的优势比值为1.133(P<0.01)。Logistic回归得出的回归预测方程为P(I)=1/[1+e-(-2.756+0.125U)]。结论 异体输血是导致受血者术后感染的独立危险因素。输血与术后感染之间存在量效关系,但是这种因果联系较弱,提示输血是术后感染的助因。     

Mortality in diabetic patients undergoing non-cardiac surgery: a 7-year follow-up study

Background: The prognosis of diabetic patients after non-cardiac surgery remains controversial. This study was designed to compare the long-term mortality between diabetic and non-diabetic control patients undergoing non-cardiac surgery and to evaluate the possible risk factors.
Methods: We investigated 274 consecutive diabetic patients and 282 non-diabetic control patients who underwent non-cardiac surgery within 1 year in a tertiary care hospital in Finland. The control group was matched for the same type of operations. Patients were followed for up to 7 years on average. The main outcome measure was mortality within 7 years.
Results: Mortality both in the short-term postoperatively (≤21 days) and in the long-term (up to 87 ½ months) was significantly higher in the diabetic patients compared with the non-diabetic group: 3.5 vs. 0% ( P <0.05) and 37.2 vs. 15% ( P <0.00001), respectively. The major causes of death among diabetic subjects were diseases of the cardiovascular system (56.8%) compared with non-diabetic patients (18.6%), P <0.0001. We found that diabetes mellitus per se is not a risk factor for post-operative mortality but a combination of variables had a significant effect on both short- and long-term mortality.
Conclusion: Diabetic patients undergoing non-cardiac surgery had a significantly higher incidence of short-term post-operative and long-term mortality compared with non-diabetic subjects. We propose a model of predictors of death among diabetic individuals undergoing non-cardiac surgery within a 7-year follow-up. The majority of deaths were associated with cardiovascular diseases.     

Use of clinically based troponin underestimates the cardiac injury in non-cardiac surgery: a single-centre cohort study in 51,701 consecutive patients

Purpose

Postoperative myocardial infarction causes hundreds of thousands of deaths annually, and ??failure to rescue?? is a leading cause of hospital mortality. Strategies to recognize cardiac injury are important to reduce the burden of cardiac-related morbidity. For these reasons, we chose to assess the association between postoperative troponin I elevations and 30-day in-hospital mortality and, secondarily, to compare the predictive value of regularly scheduled troponin estimates with troponin ordered in response to clinical indications.

Methods

We carried out a retrospective cohort analysis of 51,701 consecutive patients throughout 2003 to 2009. All patients were from a single university referral hospital and included all non-cardiac non-transplant surgery patients requiring overnight admission. Logistic regression was used to assess the risk-adjusted associations between troponin I and 30-day in-hospital mortality.

Results

The multivariable predictive model for death improved after troponin I was included. The receiver operating characteristic was 0.902 before troponin I vs 0.934 after troponin I (P?<?0.0001). The likelihood ratio for troponin was 3.0 (95% confidence interval 2.8 to 3.2) and evident in each surgical service. Increasing troponin I showed a dose-response associated with increased mortality, and compared with clinically based measurements, a regularly scheduled postoperative troponin protocol showed a threefold increase in the probability of detecting myocardial injury. However, troponin I was not found to improve the risk prediction model in the lowest risk patients (n?=?18,953; probability of death?<?0.02%) with one cardiac death.

Conclusions

Postoperatively elevated troponin I is associated with 30-day in-hospital mortality in a dose-dependent manner. A postoperative measurement protocol provides a threefold increase in the ability to detect myocardial injury. Conversely, in patients with a low mortality risk, cardiac injury is low; there is minimal improvement in the ability to detect cardiac injury, and the rescue rates from cardiac injury are excellent. These findings suggest that a surveillance protocol of troponin I would be optimal when limited to moderate to high-risk patients.