1
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Weng M, Guo M, Li T, Zhou C, Sun C, Yue Y, Liao Q, Cai S, Lu X, Zhou D, Miao C. Anemia tolerance versus blood transfusion on long-term outcomes after colorectal cancer surgery: A retrospective propensity-score-matched analysis. Front Oncol 2022; 12:940428. [PMID: 36046042 PMCID: PMC9421070 DOI: 10.3389/fonc.2022.940428] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 07/25/2022] [Indexed: 12/24/2022] Open
Abstract
Background Perioperative anemia and transfusion are intertwined with each other, and both have adverse impacts on the survival of colorectal cancer (CRC) patients. But the treatment of anemia still relies on transfusion in several countries, which leads us to question the effects of anemia tolerance and transfusion on the long-term outcomes of CRC patients. We investigated the combined effect of preoperative anemia and postoperative anemia and of preoperative anemia and blood transfusion, which imposes a greater risk to survival, to compare the effects of anemia tolerance and transfusion on overall survival (OS) and disease-free survival (DFS) in patients undergoing CRC surgery. Methods A retrospective propensity-score-matched analysis included patients with CRC undergoing elective surgery between January 1, 2008, and December 31, 2014. After propensity-score matching, Kaplan–Meier survival analysis and univariable and multivariable Cox proportional hazards models were used to study the prognostic factors for survivals. In univariate and multivariate Cox regression analysis, two novel models were built. Results Of the 8,121 patients with CRC, 1,975 (24.3%) and 6,146 (75.7%) patients presented with and without preoperative anemia, respectively. After matching, 1,690 patients remained in each group. In the preoperative anemia and postoperative anemia model, preoperative anemia and postoperative anemia was independent risk factor for OS (HR, 1.202; 95% CI, 1.043–1.385; P=0.011) and DFS (HR, 1.210; 95% CI, 1.050–1.395; P=0.008). In the preoperative anemia and transfusion model, preoperative anemia and transfused was the most dangerous independent prognostic factor for OS (HR, 1.791; 95% CI, 1.339–2.397; P<0.001) and DFS (HR, 1.857; 95% CI, 1.389–2.483; P<0.001). In patients with preoperative anemia, the OS and DFS of patients with transfusion were worse than those of patients without transfusion (P=0.026 in OS; P=0.037 in DFS). Conclusions Preoperative anemia and blood transfusion imposed a greater risk to OS and DFS in patients undergoing CRC surgery, indicating that the harm associated with blood transfusion was greater than that associated with postoperative anemia. These findings should encourage clinicians to be vigilant for the timely prevention and treatment of anemia, by appropriately promoting toleration of anemia and restricting the use of blood transfusion in patients with CRC.
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Affiliation(s)
- Meilin Weng
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Perioperative Stress and Protection, Zhongshan Hospital Fudan University, Shanghai, China
- Department of Anesthesiology, Shanghai Cancer Center, Fudan University, Shanghai, China
| | - Miaomiao Guo
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Perioperative Stress and Protection, Zhongshan Hospital Fudan University, Shanghai, China
| | - Ting Li
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Perioperative Stress and Protection, Zhongshan Hospital Fudan University, Shanghai, China
| | - Changming Zhou
- Department of Cancer Prevention, Shanghai Cancer Center, Fudan University, Shanghai, China
| | - Caihong Sun
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Perioperative Stress and Protection, Zhongshan Hospital Fudan University, Shanghai, China
| | - Ying Yue
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Perioperative Stress and Protection, Zhongshan Hospital Fudan University, Shanghai, China
| | - Qingwu Liao
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Perioperative Stress and Protection, Zhongshan Hospital Fudan University, Shanghai, China
| | - Sanjun Cai
- Department of Colorectal Surgery, Shanghai Cancer Center, Fudan University, Shanghai, China
| | - Xihua Lu
- Department of Anesthesiology, Affiliated Cancer Hospital of Zhengzhou University, Henan, China
- *Correspondence: Changhong Miao, ; Di Zhou, ; Xihua Lu,
| | - Di Zhou
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Perioperative Stress and Protection, Zhongshan Hospital Fudan University, Shanghai, China
- *Correspondence: Changhong Miao, ; Di Zhou, ; Xihua Lu,
| | - Changhong Miao
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Perioperative Stress and Protection, Zhongshan Hospital Fudan University, Shanghai, China
- *Correspondence: Changhong Miao, ; Di Zhou, ; Xihua Lu,
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2
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Shander A, Hardy JF, Ozawa S, Farmer SL, Hofmann A, Frank SM, Kor DJ, Faraoni D, Freedman J. A Global Definition of Patient Blood Management. Anesth Analg 2022; 135:476-488. [PMID: 35147598 DOI: 10.1213/ane.0000000000005873] [Citation(s) in RCA: 70] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
While patient blood management (PBM) initiatives are increasingly adopted across the globe as part of standard of care, there is need for a clear and widely accepted definition of PBM. To address this, an expert group representing PBM organizations, from the International Foundation for Patient Blood Management (IFPBM), the Network for the Advancement of Patient Blood Management, Haemostasis and Thrombosis (NATA), the Society for the Advancement of Patient Blood Management (SABM), the Western Australia Patient Blood Management (WAPBM) Group, and OnTrac (Ontario Nurse Transfusion Coordinators) convened and developed this definition: "Patient blood management is a patient-centered, systematic, evidence-based approach to improve patient outcomes by managing and preserving a patient's own blood, while promoting patient safety and empowerment." The definition emphasizes the critical role of informed choice. PBM involves the timely, multidisciplinary application of evidence-based medical and surgical concepts aimed at screening for, diagnosing and appropriately treating anemia, minimizing surgical, procedural, and iatrogenic blood losses, managing coagulopathic bleeding throughout the care and supporting the patient while appropriate treatment is initiated. We believe that having a common definition for PBM will assist all those involved including PBM organizations, hospital administrators, individual clinicians and policy makers to focus on the appropriate issues when discussing and implementing PBM. The proposed definition is expected to continue to evolve, making this endeavor a work in progress.
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Affiliation(s)
- Aryeh Shander
- From the Department of Anesthesiology, Critical Care and Hyperbaric Medicine, Englewood Health, Englewood, New Jersey.,Society for the Advancement of Patient Blood Management (SABM), Mount Royal, New Jersey
| | - Jean-Francois Hardy
- Department of Anaesthesiology and Pain Medicine, Université de Montréal, Montréal, Quebec, Canada.,Network for the Advancement of Patient Blood Management, Haemostasis and Thrombosis (NATA), Paris, France
| | - Sherri Ozawa
- Society for the Advancement of Patient Blood Management (SABM), Mount Royal, New Jersey.,Institute for Patient Blood Management and Bloodless Medicine and Surgery, Englewood Health, Englewood, New Jersey
| | - Shannon L Farmer
- Medical School and Division of Surgery, Faculty of Medicine and Health Sciences, The University of Western Australia, Perth, Western Australia, Australia.,Department of Haematology, Royal Perth Hospital, Perth, Western Australia, Australia.,International Foundation for Patient Blood Management, Basel, Switzerland.,The Western Australia Patient Blood Management Group, The University of Western Australia, Perth, Western Australia, Australia
| | - Axel Hofmann
- Medical School and Division of Surgery, Faculty of Medicine and Health Sciences, The University of Western Australia, Perth, Western Australia, Australia.,International Foundation for Patient Blood Management, Basel, Switzerland.,Department of Anesthesiology, University Hospital Zurich, Zurich, Switzerland
| | - Steven M Frank
- Department of Anesthesiology, Critical Care Medicine, Johns Hopkins Health System Patient Blood Management Program, The Armstrong Institute for Patient Safety and Quality, Johns Hopkins Medicine, Baltimore, Maryland
| | - Daryl J Kor
- Division of Critical Care Medicine, Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, Michigan.,Patient Blood Management Program, Mayo Clinic, Rochester, Michigan
| | - David Faraoni
- Network for the Advancement of Patient Blood Management, Haemostasis and Thrombosis (NATA), Paris, France.,Department of Anesthesiology, Hospital for Sick Children, Toronto, Ontario, Canada
| | - John Freedman
- Ontario Nurse Transfusion Coordinators Program (ONTraC), Ontario, Canada.,The Department of Medicine, University of Toronto, Toronto, Ontario, Canada
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3
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Unal D, Senayli Y, Polat R, Spahn DR, Toraman F, Alkis N. Peri-operative blood transfusion in elective major surgery: incidence, indications and outcome - an observational multicentre study. BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2020; 18:261-279. [PMID: 32697928 PMCID: PMC7375885 DOI: 10.2450/2020.0011-20] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Accepted: 04/23/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND Patients' demographic and epidemiological characteristics, local variations in clinicians' knowledge and experience and types of surgery can influence peri-operative transfusion practices. Sharing data on transfusion practices and recipients may improve patients' care and implementation of Patient Blood Management (PBM). MATERIALS AND METHODS This was a multicentre, prospective, observational, cross-sectional study that included 61 centres. Clinical and transfusion data of patients undergoing major elective surgery were collected; transfusion predictors and patients' outcomes were analysed. RESULTS Of 6,121 patients, 1,579 (25.8%) received a peri-operative transfusion. A total of 5,812 blood components were transfused: red blood cells (RBC), fresh-frozen plasma and platelets in 1,425 (23.3%), 762 (12.4%) and 88 (1.4%) cases, respectively). Pre-operative anaemia was identified in 2,019 (33%) patients. Half of the RBC units were used by patients in the age group 45-69 years. Specific procedures with the highest RBC use were coronary artery bypass grafting (16.9% of all units) and hip arthroplasty (14.9%). Low haemoglobin concentration was the most common indication for intra-operative RBC transfusion (57%) and plasma and platelet transfusions were mostly initiated for acute bleeding (61.3% and 61.1%, respectively). The RBC transfusion rate in study centres varied from 2% to 72%. RBC transfusion was inappropriate in 99% (n=150/151) of pre-operative, 23% (n=211/926) of intra-operative and 43% (n=308/716) of post-operative RBC transfusion episodes. Pre-operative haemoglobin, increased blood loss, open surgery and duration of surgery were the main independent predictors of intra-operative RBC transfusion. Low pre-operative haemoglobin concentration was independently associated with post-operative pulmonary complications. CONCLUSIONS These findings identified areas for improvement in peri-operative transfusion practice and PBM implementation in Turkey.
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Affiliation(s)
- Dilek Unal
- Department of Anaesthesiology and Reanimation, University of Health Sciences Diskapi Yildirim Beyazit Teaching Hospital, Ankara, Turkey
| | - Yesim Senayli
- Department of Anaesthesiology and Reanimation, “Ankara Gulhane” Teaching Hospital, Ankara, Turkey
| | - Reyhan Polat
- Department of Anaesthesiology and Reanimation, University of Health Sciences Diskapi Yildirim Beyazit Teaching Hospital, Ankara, Turkey
| | - Donat R. Spahn
- Institute of Anaesthesiology, University of Zurich and University Hospital Zurich, Zurich, Switzerland
| | - Fevzı Toraman
- Department of Anaesthesiology, “Acibadem Mehmet Ali Aydınlar” University School of Medicine, Istanbul, Turkey
| | - Neslıhan Alkis
- Department of Anaesthesiology and Reanimation, Ankara University Medical Faculty, Ankara, Turkey
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4
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Assmann AK, Akhyari P, Demler F, Lichtenberg A, Assmann A. A magnetic resonance imaging-compatible small animal model under extracorporeal circulation. Interact Cardiovasc Thorac Surg 2019; 29:612-614. [PMID: 31173089 DOI: 10.1093/icvts/ivz139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 04/30/2019] [Accepted: 05/05/2019] [Indexed: 11/15/2022] Open
Abstract
The impact of different extracorporeal circulation (ECC) scenarios on arterial blood flow profiles has not yet been revealed. To allow for exact measurements, magnetic resonance imaging (MRI) during ECC is required. Therefore, the present study addressed the feasibility of a high-resolution MRI-compatible animal model of ECC. For usage in New Zealand White rabbits, we developed an ECC device, the tubes of which were long enough to eliminate impacts of the magnetic field on the blood pump and heart-lung control machine. The miniaturized ECC system via thoracic access comprised an infant oxygenator, a pulsatile centrifugal pump, 1/8″ tubes, a 10-Fr aortic cannula and a 12-Fr venous cannula for vacuum-assisted drainage. This miniaturized ECC system has very low priming volume (230-255 ml) to reduce the system-inherent haemodilution to 50%. Consequently, haemoglobin rates remained high enough to guarantee adequate oxygenation (arterial pressure of oxygen >200 mmHg). Optimized venous drainage by an additionally inserted pulmonary artery vent catheter resulted in sufficient blood flow (31.6-65.8 ml/min/kg) that was maintained for 60 min with pulsatility. The current study demonstrates the feasibility of MRI-compatible ECC in rabbits, and this model allows for real-time blood flow profile measurements during different ECC scenarios in future projects.
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Affiliation(s)
- Anna Kathrin Assmann
- Department of Cardiovascular Surgery and Research Group for Experimental Surgery, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
| | - Payam Akhyari
- Department of Cardiovascular Surgery and Research Group for Experimental Surgery, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
| | - Florian Demler
- Department of Cardiovascular Surgery and Research Group for Experimental Surgery, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
| | - Artur Lichtenberg
- Department of Cardiovascular Surgery and Research Group for Experimental Surgery, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
| | - Alexander Assmann
- Department of Cardiovascular Surgery and Research Group for Experimental Surgery, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
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5
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Lin SY, Hsu WH, Lin CC, Lin CL, Yeh HC, Kao CH. Association of Transfusion With Risks of Dementia or Alzheimer's Disease: A Population-Based Cohort Study. Front Psychiatry 2019; 10:571. [PMID: 31474887 PMCID: PMC6706818 DOI: 10.3389/fpsyt.2019.00571] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 07/22/2019] [Indexed: 12/20/2022] Open
Abstract
Purpose: The association between neurodegenerative diseases and transfusion remains to be investigated. Methods: The study population comprised 63,813 patients who underwent a blood transfusion and 63,813 propensity score-matched controls between 2000 and 2010. Data were obtained from the Taiwan National Health Insurance Research Database, which is maintained by the National Health Research Institutes. A Cox regression analysis was conducted to elucidate the relationship between blood transfusions and the risk of dementia. Results: A multivariate Cox regression analysis of factors, such as age, sex, cardiovascular ischemia disease, and depression, revealed that patients who underwent a blood transfusion showed a 1.73-fold higher risk of dementia [95% confidence interval (CI) = 1.62-1.84] and a 1.37-fold higher risk of Alzheimer's disease (AD) [95% CI = 1.13-1.66] than those who did not. Patients who received a transfusion of washed red blood cells showed a 2.37-fold higher risk of dementia (95% CI = 1.63-3.44) than those who did not. Conclusion: Blood transfusion, especially transfusion of any type of red blood cells is associated with an increased risk of dementia.
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Affiliation(s)
- Shih-Yi Lin
- Graduate Institute of Biomedical Sciences, College of Medicine, China Medical University, Taichung, Taiwan.,Division of Nephrology and Kidney Institute, China Medical University Hospital, Taichung, Taiwan
| | - Wu-Huei Hsu
- Graduate Institute of Biomedical Sciences, College of Medicine, China Medical University, Taichung, Taiwan.,Division of Pulmonary and Critical Care Medicine, China Medical University Hospital and China Medical University, Taichung, Taiwan
| | - Cheng-Chieh Lin
- Graduate Institute of Biomedical Sciences, College of Medicine, China Medical University, Taichung, Taiwan.,Department of Family Medicine, China Medical University Hospital, Taichung, Taiwan
| | - Cheng-Li Lin
- Management Office for Health Data, China Medical University Hospital and Center of Augmented Intelligence in Healthcare, Taichung, Taiwan.,College of Medicine, China Medical University, Taichung, Taiwan
| | - Hung-Chieh Yeh
- Graduate Institute of Biomedical Sciences, College of Medicine, China Medical University, Taichung, Taiwan
| | - Chia-Hung Kao
- Graduate Institute of Biomedical Sciences, College of Medicine, China Medical University, Taichung, Taiwan.,Department of Nuclear Medicine, China Medical University Hospital, Taichung, Taiwan.,Department of Bioinformatics and Medical Engineering, Asia University, Taichung, Taiwan
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6
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Dhir A, Tempe DK. Anemia and Patient Blood Management in Cardiac Surgery—Literature Review and Current Evidence. J Cardiothorac Vasc Anesth 2018; 32:2726-2742. [DOI: 10.1053/j.jvca.2017.11.043] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Indexed: 12/24/2022]
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7
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Shander A, Goodnough LT. Management of anemia in patients who decline blood transfusion. Am J Hematol 2018; 93:1183-1191. [PMID: 30033541 DOI: 10.1002/ajh.25167] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 06/01/2018] [Accepted: 06/04/2018] [Indexed: 12/26/2022]
Abstract
Declining a treatment modality should not be considered the same as refusal of medical care as illustrated by the management of Jehovah's Witness patients who do not accept transfusions. Over the years, a comprehensive set of strategies have been developed to meet the specific needs of these patients and these strategies are collectively called "Bloodless Medicine and Surgery" (BMS). The focus in BMS is to optimize the patients' hematopoietic capacity to increase hemoglobin (Hgb) level, minimize blood loss, improve hemostasis, and provide supportive strategies to minimize oxygen consumption and maximize oxygen utilization. We present 3 case reports that illustrate some of the challenges faced and measures available to effectively treat these patients. Under BMS programs, patients with extremely low hemoglobin levels, not conducive to survival under ordinary conditions, have survived and recovered without receiving allogeneic transfusions. Additionally, the valuable experience gained from caring for these patients has paved the way to develop the concept of Patient Blood Management as a standard care to benefit all patients, and not only those for whom blood is not an option.
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Affiliation(s)
- Aryeh Shander
- Department of Anesthesiology and Critical Care medicine; Englewood Hospital and Medical Center, and TeamHealth Research Institute; Englewood New Jersey
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8
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Implementation of a Standardized Transfusion Protocol for Cardiac Patients Treated With Venoarterial Extracorporeal Membrane Oxygenation Is Associated With Decreased Blood Component Utilization and May Improve Clinical Outcome. Anesth Analg 2018; 126:1262-1267. [DOI: 10.1213/ane.0000000000002238] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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9
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Abstract
Transfusion decision making (TDM) in the critically ill requires consideration of: (1) anemia tolerance, which is linked to active pathology and to physiologic reserve, (2) differences in donor RBC physiology from that of native RBCs, and (3) relative risk from anemia-attributable oxygen delivery failure vs hazards of transfusion, itself. Current approaches to TDM (e.g. hemoglobin thresholds) do not: (1) differentiate between patients with similar anemia, but dissimilar pathology/physiology, and (2) guide transfusion timing and amount to efficacy-based goals (other than resolution of hemoglobin thresholds). Here, we explore approaches to TDM that address the above gaps.
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Affiliation(s)
- Chris Markham
- Division of Critical Care Medicine, Department of Pediatrics, Washington University School of Medicine, McDonnell Pediatric Research Building, Campus Box 8208, 660 South Euclid Avenue, St Louis, MO 63110-1093, USA
| | - Sara Small
- Social Systems Design Laboratory, Brown School of Social Work, Washington University, Campus Box 1196, 1 Brookings Drive, St Louis, MO 63130, USA
| | - Peter Hovmand
- Social Systems Design Laboratory, Brown School of Social Work, Washington University, Campus Box 1196, 1 Brookings Drive, St Louis, MO 63130, USA
| | - Allan Doctor
- Division of Critical Care Medicine, Department of Pediatrics, Washington University School of Medicine, McDonnell Pediatric Research Building, Campus Box 8208, 660 South Euclid Avenue, St Louis, MO 63110-1093, USA.
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10
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Abstract
Anemia is a common and often ignored condition in surgical patients. Anemia is usually multifactorial and iron deficiency and inflammation are commonly involved. An exacerbating factor in surgical patients is iatrogenic blood loss. Anemia has been repeatedly shown to be an independent predictor of worse outcomes. Patient blood management (PBM) provides a multimodality framework for prevention and management of anemia and related risk factors. The key strategies in PBM include support of hematopoiesis and improving hemoglobin level, optimizing coagulation and hemostasis, use of interdisciplinary blood conservation modalities, and patient-centered decision making throughout the course of care.
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Affiliation(s)
- Aryeh Shander
- Department of Anesthesiology and Critical Care Medicine, Englewood Hospital and Medical Center, TeamHealth Research Institute, 350 Engle Street, Englewood, NJ 07631, USA.
| | - Gregg P Lobel
- Department of Anesthesiology and Critical Care Medicine, Englewood Hospital and Medical Center, TeamHealth Research Institute, 350 Engle Street, Englewood, NJ 07631, USA
| | - Mazyar Javidroozi
- Department of Anesthesiology and Critical Care Medicine, Englewood Hospital and Medical Center, TeamHealth Research Institute, 350 Engle Street, Englewood, NJ 07631, USA
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11
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Lobel GP, Javidroozi M, Shander A. Risks of Anemia in Cardiac Surgery Patients. Semin Cardiothorac Vasc Anesth 2016; 19:288-92. [PMID: 26660052 DOI: 10.1177/1089253215613792] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Anemia is an common condition in patients undergoing cardiac surgery, and it is often present in one quarter to half of patients at admission. Several studies have indicated that anemia is a major risk factor for worse outcomes, including increased risk of mortality and major morbidity and prolonged hospitalization. Anemia is a leading reason for use of allogeneic blood transfusions. Harmful effects of anemia are often attributed to the reduced oxygen carrying capacity of blood, reduced viscosity and the resulting impaired rheologic characteristics of blood, underlying comorbidities, and the side effects of treatments given for anemia, namely, allogeneic blood transfusions. Patients undergoing cardiac surgery may be at increased risk of anemia given the often-existing cardiac comorbidities and the negative impacts of cardiopulmonary bypass. However, whether less restrictive transfusion practices are justified in patients undergoing cardiac surgery is still a matter of debate. The prevalence of anemia often increases during hospital stay, and it can persist for a long time beyond hospital discharge. Given the associated risks and available management strategies, clinicians should remain vigilant to detect and treat anemia throughout the course of care for patients undergoing cardiac surgery.
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Affiliation(s)
- Gregg P Lobel
- Englewood Hospital and Medical Center, Englewood, NJ, USA
| | | | - Aryeh Shander
- Englewood Hospital and Medical Center, Englewood, NJ, USA
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12
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Shander A, Gilsanz F. Monitoring, safety and efficiency in the use of blood components. ACTA ACUST UNITED AC 2016; 64:1-5. [PMID: 27567346 DOI: 10.1016/j.redar.2016.06.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 06/21/2016] [Indexed: 12/24/2022]
Affiliation(s)
- A Shander
- Department of Anesthesiology and Critical Care Medicine, Englewood Hospital and Medical Center, Englewood, New Jersey, Estados Unidos de América; TeamHealth Research Institute, Englewood, New Jersey, Estados Unidos de América.
| | - F Gilsanz
- Servicio de Anestesia-Reanimación, Hospital Universitario La Paz, Madrid, España
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13
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Cutaneous Mitochondrial Po2, but Not Tissue Oxygen Saturation, Is an Early Indicator of the Physiologic Limit of Hemodilution in the Pig. Anesthesiology 2016; 125:124-32. [DOI: 10.1097/aln.0000000000001156] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Abstract
Background
Hemodilution is a consequence of fluid replacement during blood loss and is limited by the individual ability to compensate for decreasing hemoglobin level. We tested the ability of a novel noninvasive method for measuring cutaneous mitochondrial Po2 (mitoPo2) to detect this threshold early.
Methods
Anesthetized and ventilated pigs were hemodynamically monitored and randomized into a hemodilution (n = 12) or a time control (TC) group (n = 14). MitoPo2 measurements were done by oxygen-dependent delayed fluorescence of protoporphyrin IX after preparation of the skin with 20% 5-aminolevulinic acid cream. Tissue oxygen saturation (StO2) was measured with near infrared spectroscopy on the thoracic wall. After baseline measurements, progressive normovolemic hemodilution was performed in the hemodilution group in equal steps (500 ml blood replaced by 500 ml Voluven®; Fresenius Kabi AG, Germany). Consecutive measurements were performed after 20-min stabilization periods and repeated 8 times or until the animal died.
Results
The TC animals remained stable with regard to hemodynamics and mitoPo2. In the hemodilution group, mitoPo2 became hemoglobin-dependent after reaching a threshold of 2.6 ± 0.2 g/dl. During hemodilution, hemoglobin and mitoPo2 decreased (7.9 ± 0.2 to 2.1 ± 0.2 g/dl; 23.6 ± 2 to 9.9 ± 0.8 mmHg), but StO2 did not. Notably, mitoPo2 dropped quite abruptly (about 39%) at the individual threshold. We observed that this decrease in mitoPo2 occurred at least one hemodilution step before changes in other conventional parameters.
Conclusions
Cutaneous mitoPo2 decreased typically one hemodilution step before occurrence of significant alterations in systemic oxygen consumption and lactate levels. This makes mitoPo2 a potential early indicator of the physiologic limit of hemodilution and possibly a physiologic trigger for blood transfusion.
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14
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Colomina MJ, Guilabert P. [Transfusion according to haemoglobin levels or therapeutic objectives]. REVISTA ESPANOLA DE ANESTESIOLOGIA Y REANIMACION 2016; 63:65-68. [PMID: 26626434 DOI: 10.1016/j.redar.2015.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Accepted: 10/13/2015] [Indexed: 06/05/2023]
Affiliation(s)
- M J Colomina
- Servicio de Anestesiología y Reanimación, Hospital Universitario Vall d'Hebron, Barcelona, España.
| | - P Guilabert
- Servicio de Anestesiología y Reanimación, Hospital Universitario Vall d'Hebron, Barcelona, España
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15
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Ferraris VA, Hochstetler M, Martin JT, Mahan A, Saha SP. Blood transfusion and adverse surgical outcomes: The good and the bad. Surgery 2015; 158:608-17. [DOI: 10.1016/j.surg.2015.02.027] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2015] [Revised: 02/15/2015] [Accepted: 02/27/2015] [Indexed: 01/09/2023]
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16
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Valentijn TM, Hoeks SE, Bakker EJ, van de Luijtgaarden KM, Verhagen HJ, Stolker RJ, van Lier F. The Impact of Perioperative Red Blood Cell Transfusions on Postoperative Outcomes in Vascular Surgery Patients. Ann Vasc Surg 2015; 29:511-9. [DOI: 10.1016/j.avsg.2014.08.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Revised: 07/18/2014] [Accepted: 08/24/2014] [Indexed: 11/28/2022]
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Spahn DR, Spahn GH, Stein P. Evidence base for restrictive transfusion triggers in high-risk patients. Transfus Med Hemother 2015; 42:110-4. [PMID: 26019706 DOI: 10.1159/000381509] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 03/09/2015] [Indexed: 01/28/2023] Open
Abstract
UNLABELLED Liberal versus restrictive red blood cell (RBC) transfusion triggers have been debated for years. This review illustrates the human body's physiologic response to acute anemia and summarizes the evidence from prospective randomized trials (RCTs) for restrictive use of RBC transfusions in high-risk patients. During progressive anemia, the human body maintains the oxygen delivery to the tissues by an increase in cardiac output and peripheral oxygen extraction. Seven RCTs with a total of 5,566 high-risk patients compared a restrictive hemoglobin (Hb) transfusion trigger (Hb < 70 or < 80 g/l) with a liberal Hb transfusion trigger (Hb < 90 or < 100 g/l). Unanimously these studies show non-inferiority, safety, and a significant reduction in RBC transfusions in the restrictive groups. In one RCT mortality was higher in the liberal Hb transfusion group, and in two additional RCTs mortality of subgroups or after risk adjustment was significantly higher in the liberal Hb transfusion trigger groups. CONCLUSION Strong RCT evidence suggests the safety of restrictive transfusion triggers. As a consequence, an Hb transfusion trigger of <70 g/l is recommended for high risk patients.
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Affiliation(s)
- Donat R Spahn
- Institute of Anesthesiology, University and University Hospital of Zurich, Zurich, Switzerland
| | - Gabriela H Spahn
- Institute of Anesthesiology, University and University Hospital of Zurich, Zurich, Switzerland
| | - Philipp Stein
- Institute of Anesthesiology, University and University Hospital of Zurich, Zurich, Switzerland
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Mackenzie CF, Shander A. What to do if no blood is available but the patient is bleeding? SOUTHERN AFRICAN JOURNAL OF ANAESTHESIA AND ANALGESIA 2014. [DOI: 10.1080/22201173.2008.10872520] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Zhu SH, Ji MH, Gao DP, Li WY, Yang JJ. Association between perioperative blood transfusion and early postoperative cognitive dysfunction in aged patients following total hip replacement surgery. Ups J Med Sci 2014; 119:262-7. [PMID: 24345210 PMCID: PMC4116766 DOI: 10.3109/03009734.2013.873502] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
INTRODUCTION Accumulating evidence suggests that enhanced inflammatory responses contribute to the pathogenesis of postoperative cognitive dysfunction (POCD). Blood transfusion can trigger an enhancement of acute inflammatory responses. Therefore, we hypothesized that perioperative blood transfusion is associated with a higher risk of POCD in aged patients following total hip replacement surgery. MATERIAL AND METHODS Patients older than 65 years undergoing elective total hip replacement surgery were enrolled from October 2011 to December 2012. Neurocognitive tests were evaluated at baseline and at 7 d after surgery by a Mini-Mental State Test. Multivariate logistic regression analysis was used to determine risk factors associated with POCD. RESULTS Fifty-six patients (27.3%) developed POCD 7 d postoperatively. Patients who developed POCD were older, had a lower education level and preoperative hemoglobin concentration, had more blood loss, and had a lower body weight (p < 0.05). Patients with POCD were more likely to receive red blood cells (RBCs) transfusion (51.8% versus 31.5%; p < 0.05). A multivariable logistic regression model identified older age, lower education level, and perioperative blood transfusion of more than 3 units as independent risk factors for POCD 7 d postoperatively. CONCLUSION Our data suggested that perioperative blood transfusion of more than 3 units of RBCs is an independent risk factor for POCD in aged patients following total hip replacement surgery.
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Affiliation(s)
- Si-Hai Zhu
- Department of Anesthesiology, Jinling Hospital, School of Medicine, Nanjing University , Nanjing , China
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Abstract
PURPOSE OF REVIEW This review provides a summary of the clinical trials evaluating transfusion thresholds and recommendations for red blood cell transfusion. We highlight the trial results in patients in the critical care setting, undergoing surgery, and patients with gastrointestinal bleed, acute coronary syndrome, and acute brain injury. RECENT FINDINGS Clinical trials in hip fracture patients with underlying cardiovascular disease or risk factors, and in cardiac surgery, support the findings from prior studies in intensive care unit patients that restrictive transfusion (7-8 g/dl) is well tolerated even in elderly high-risk patients. Restrictive transfusion strategy (7 g/dl) was further supported by the statistically lower mortality in patients with gastrointestinal bleeding compared with liberal transfusion (10 g/dl) strategy. Pilot trials in acute coronary syndrome raise the possibility that liberal transfusion improves outcome, but large trials are needed. SUMMARY A restrictive transfusion strategy of administering red blood cell transfusion in patients with hemoglobin concentration of 7-8 g/dl in most patients is supported by randomized clinical trials. Further randomized clinical trials are needed to establish the optimal transfusion threshold in patients with acute coronary syndrome and brain injury, and to elucidate physiological triggers.
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Song HK, von Heymann C, Jespersen CM, Karkouti K, Korte W, Levy JH, Ranucci M, Saugstrup T, Sellke FW. Safe application of a restrictive transfusion protocol in moderate-risk patients undergoing cardiac operations. Ann Thorac Surg 2014; 97:1630-5. [PMID: 24655469 DOI: 10.1016/j.athoracsur.2013.12.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Revised: 12/10/2013] [Accepted: 12/18/2013] [Indexed: 10/25/2022]
Abstract
BACKGROUND Perioperative red blood cell transfusion is associated with adverse outcomes after cardiac operations. Although restrictive transfusion protocols have been developed, their safety and efficacy are not well demonstrated, and considerable variation in transfusion practice persists. We report our experience with a restrictive transfusion protocol. METHODS We analyzed the outcomes in 409 patients undergoing cardiac operations enrolled in a trial conducted at 30 centers worldwide. Blood products were administered on the basis of a transfusion algorithm applied across all centers, with a restrictive transfusion trigger of hemoglobin less than or equal to 6 g/dL. Transfusion was acceptable but not mandatory for hemoglobin 6 to 8 g/dL. For hemoglobin 8 to 10 g/dL, transfusion was acceptable only with evidence for end-organ ischemia. RESULTS The patient population was moderately complex, with 20.5% having combined procedures and 29.6% having nonelective operations. The mean EuroSCORE for the population was 4.3, which predicted a substantial incidence of morbidity and mortality. Actual outcomes were excellent, with observed mortality of 0.49% and rates of cerebrovascular accident, myocardial infarction, and acute renal failure 1.2%, 6.1%, and 0.98%, respectively. The frequency of red blood cell transfusion was 33.7%, which varied significantly by center. Most transfusions (71.9%) were administered for hemoglobin 6 to 8 g/dL; 21.4% were administered for hemoglobin 8 to 10 g/dL with evidence for end-organ ischemia; 65.0% of patients avoided allogeneic transfusion altogether. CONCLUSIONS A restrictive transfusion protocol can be safely applied in the care of moderate-risk patients undergoing cardiac operations. This strategy has significant potential to reduce transfusion and resource utilization in these patients, standardize transfusion practices across institutions, and increase the safety of cardiac operations.
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Affiliation(s)
- Howard K Song
- Division of Cardiothoracic Surgery, Oregon Health & Science University, Portland, Oregon.
| | - Christian von Heymann
- Department of Anaesthesiology and Intensive Care Medicine, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | | | - Keyvan Karkouti
- Department of Anesthesia and Toronto General Research Institute, Toronto General Hospital, University Health Network, University of Toronto, Toronto, Ontario, Canada
| | | | - Jerrold H Levy
- Department of Anesthesiology and Critical Care, Duke University School of Medicine, Durham, North Carolina
| | - Marco Ranucci
- Department of Cardiothoracic-Vascular Anesthesia and Intensive Care Unit, IRCCS Policlinico San Donato, San Donato Milanese, Milan, Italy
| | | | - Frank W Sellke
- Department of Surgery, Rhode Island Hospital, Brown Medical School, Providence, Rhode Island
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Goodnough LT, Schrier SL. Evaluation and management of anemia in the elderly. Am J Hematol 2014; 89:88-96. [PMID: 24122955 DOI: 10.1002/ajh.23598] [Citation(s) in RCA: 161] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Accepted: 09/21/2013] [Indexed: 12/14/2022]
Abstract
Anemia is now recognized as a risk factor for a number of adverse outcomes in the elderly, including hospitalization, morbidity, and mortality. What constitutes appropriate evaluation and management for an elderly patient with anemia, and when to initiate a referral to a hematologist, are significant issues. Attempts to identify suggested hemoglobin levels for blood transfusion therapy have been confounded for elderly patients with their co-morbidities. Since no specific recommended hemoglobin threshold has stood the test of time, prudent transfusion practices to maintain hemoglobin thresholds of 9-10 g/dL in the elderly are indicated, unless or until evidence emerges to indicate otherwise.
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Affiliation(s)
- Lawrence Tim Goodnough
- Department of Pathology and Medicine; Stanford University School of Medicine; Stanford California
- Department of Medicine; Stanford University School of Medicine; Stanford California
- Division of Hematology; Stanford University School of Medicine; Stanford California
| | - Stanley L. Schrier
- Department of Medicine; Stanford University School of Medicine; Stanford California
- Division of Hematology; Stanford University School of Medicine; Stanford California
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Pape A, Steche M, Laout M, Wedel M, Schwerdel F, Weber CF, Zwissler B, Habler O. The limit of anemia tolerance during hyperoxic ventilation with pure oxygen in anesthetized domestic pigs. ACTA ACUST UNITED AC 2013; 51:156-69. [PMID: 24401552 DOI: 10.1159/000357171] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Accepted: 11/10/2013] [Indexed: 11/19/2022]
Abstract
BACKGROUND During acellular replacement of an acute blood loss, hyperoxic ventilation (HV) increases the amount of O2 physically dissolved in the plasma and thereby improves O2 supply to the tissues. While this effect could be demonstrated for HV with inspiratory O2 fraction (FiO2) 0.6, it was unclear whether HV with pure oxygen (FiO2 1.0) would have an additional effect on the physiological limit of acute normovolemic anemia. METHODS Seven anesthetized domestic pigs were ventilated with FiO2 1.0 and subjected to an isovolemic hemodilution protocol. Blood was drawn and replaced by a 6% hydroxyethyl starch (HES) solution (130/0.4) until a sudden decrease of total body O2 consumption (VO2) indicated the onset of O2 supply dependency (primary endpoint). The corresponding hemoglobin (Hb) concentration was defined as 'critical Hb' (Hbcrit). Secondary endpoints were parameters of myocardial function, central hemodynamics, O2 transport and tissue oxygenation. RESULTS HV with FiO2 1.0 enabled a large blood-for-HES exchange (156 ± 28% of the circulating blood volume) until Hbcrit was met at 1.3 ± 0.3 g/dl. After termination of the hemodilution protocol, the contribution of O2 physically dissolved in the plasma to O2 delivery and VO2 had significantly increased from 11.7 ± 2 to 44.2 ± 9.7% and from 29.1 ± 4.2 to 66.2 ± 11.7%, respectively. However, at Hbcrit, cardiovascular performance was found to have severely deteriorated. CONCLUSION HV with FiO2 1.0 maintains O2 supply to tissues during extensive blood-for-HES exchange. In acute situations, where profound anemia must be tolerated (e.g. bridging an acute blood loss until red blood cells become available for transfusion), O2 physically dissolved in the plasma becomes an essential source of oxygen. However, compromised cardiovascular performance might require additional treatment.
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Affiliation(s)
- A Pape
- Department of Anesthesia, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt, Frankfurt/Main, Germany
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25
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Impact of haemoglobin concentration on cardiovascular outcome after vascular surgery. Eur J Anaesthesiol 2013; 30:664-70. [DOI: 10.1097/eja.0b013e328362a5fd] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Beyer I, Compté N, Busuioc A, Cappelle S, Lanoy C, Cytryn E. Anemia and transfusions in geriatric patients: a time for evaluation. Hematology 2013; 15:116-21. [DOI: 10.1179/102453310x12583347010052] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Affiliation(s)
- I. Beyer
- Geriatric DepartmentUniversitair Ziekenhuis Brussel, Laarbeeklaan 101, Brussels B-1090, Belgium
| | - N. Compté
- Geriatric DepartmentHôpital Académique Erasme, Brussels, Belgium
| | - A. Busuioc
- Geriatric Department, Centre Hospitalier Universitaire Brugmann, Free University of Brussels (VUB/ULB), Brussels, Belgium
| | - S. Cappelle
- Geriatric DepartmentHôpital Académique Erasme, Brussels, Belgium
| | - C. Lanoy
- Geriatric Department, Centre Hospitalier Universitaire Brugmann, Free University of Brussels (VUB/ULB), Brussels, Belgium
| | - E. Cytryn
- Geriatric Department, Centre Hospitalier Universitaire Brugmann, Free University of Brussels (VUB/ULB), Brussels, Belgium
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The oxygen supply–demand balance: A monitoring challenge. Best Pract Res Clin Anaesthesiol 2013; 27:201-7. [DOI: 10.1016/j.bpa.2013.06.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Revised: 05/01/2013] [Accepted: 06/05/2013] [Indexed: 02/08/2023]
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Abstract
Recent progress has been made in the identification and implementation of best transfusion practices on the basis of evidence-based clinical trials, published clinical practice guidelines, and process improvements for blood use and clinical patient outcomes. However, substantial variability persists in transfusion outcomes for patients in some clinical settings--eg, patients undergoing cardiothoracic surgery. This variability could be the result of insufficient understanding of published guidelines; different recommendations of medical societies, including the specification of a haemoglobin concentration threshold to use as a transfusion trigger; the value of haemoglobin as a surrogate indicator for transfusion benefit, even though only changes in concentration and not absolute red cell mass of haemoglobin can be identified; and disagreement about the validity of the level 1 evidence for clinical practice guidelines. Nevertheless, institutional experience and national databases suggest that a restrictive blood transfusion approach is being increasingly implemented as best practice.
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Abstract
PURPOSE OF REVIEW Severe trauma is associated with hemorrhage, coagulopathy and transfusion of blood and blood products, all associated with considerable mortality and morbidity. The aim of this review is to focus on resuscitation, transfusion strategies and the management of bleeding in trauma as well as to emphasize on why coagulation has to be monitored closely and to discuss the rationale of modern and future transfusion strategies. RECENT FINDINGS Coagulopathy and uncontrolled bleeding remain leading causes of death in trauma, lead to blood transfusions and increased mortality as it has been recently shown that blood transfusion per se results in an adverse outcome. In the last years, damage control resuscitation, a combination of permissive hypotension, hemostatic resuscitation and damage control surgery, has been introduced to treat severely traumatized patients in hemorrhagic shock. Goals of treatment in trauma patients remain avoiding metabolic acidosis, hypothermia, treating coagulopathy and stabilizing the patient as soon as possible. The place of colloids and crystalloids in trauma resuscitation as well as the role of massive transfusion protocols with a certain FFP : RBC ratio and even platelets have to be reevaluated. SUMMARY Close monitoring of bleeding and coagulation in trauma patients allows goal-directed transfusions and thereby optimizes the patient's coagulation, reduces the exposure to blood products, reduces costs and may improve clinical outcome.
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Shander A, Gross I, Hill S, Javidroozi M, Sledge S. A new perspective on best transfusion practices. BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2013; 11:193-202. [PMID: 23399354 PMCID: PMC3626470 DOI: 10.2450/2012.0195-12] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Accepted: 10/25/2012] [Indexed: 01/08/2023]
Affiliation(s)
- Aryeh Shander
- Department of Anesthesiology and Critical Care Medicine, Englewood Hospital and Medical Center, Englewood, New Jersey
- Institute for Patient Blood Management and Bloodless Medicine, Englewood Hospital and Medical Center, Englewood, New Jersey
| | - Irwin Gross
- Department of Transfusion Services, Eastern Maine Medical Center, Bangor, Maine
| | - Steven Hill
- Division of Cardiothoracic Anesthesia, Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina
| | - Mazyar Javidroozi
- Department of Anesthesiology and Critical Care Medicine, Englewood Hospital and Medical Center, Englewood, New Jersey
| | - Sharon Sledge
- Department of Patient Blood Management, Newark Beth Israel Medical Center, Newark, New Jersey, United States of America
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Lafère P, Schubert T, De Bels D, Germonpré P, Balestra C. Can the normobaric oxygen paradox (NOP) increase reticulocyte count after traumatic hip surgery? J Clin Anesth 2013; 25:129-34. [PMID: 23333785 DOI: 10.1016/j.jclinane.2012.06.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Revised: 06/25/2012] [Accepted: 06/26/2012] [Indexed: 01/31/2023]
Abstract
STUDY OBJECTIVE To determine if the normobaric oxygen paradox (NOP) was effective in increasing reticulocyte count and reducing postoperative requirements for allogeneic red blood cell transfusion after traumatic hip surgery. DESIGN Prospective, randomized, double blinded, multi-center study. SETTING Surgical wards of two academic hospitals. PATIENTS 85 ASA physical status 1 and 2 patients undergoing surgery for traumatic hip fracture. INTERVENTIONS Patients were randomly assigned to receive 30 minutes of air [air group (control); n = 40] or 30 minutes of 100% oxygen (O2 group; n = 14) at 15 L/min every day from the first postoperative day (POD 1) until discharge. MEASUREMENTS Venous blood samples were taken at admission and after surgery on POD 1, POD 3, and POD 7. Hemoglobin (Hb), hematocrit (Hct), reticulocytes, hemodynamic variables, and transfusion requirements were recorded, as were hospital length of stay (LOS) and mortality. MAIN RESULTS Full analysis was obtained for 80 patients. On hospital discharge, the mean increase in reticulocyte count was significantly higher in the O2 group than the air group. Percent variation also increased: 184.9% ± 41.4% vs 104.7% ± 32.6%, respectively; P < 0.001. No difference in Hb or Hct levels was noted at discharge. Allogeneic red blood cell transfusion was 7.5% in the O2 group versus 35% in the air group (P = 0.0052). Hospital LOS was significantly shorter in the O2 group than the air group (7.2 ± 0.7 days vs 7.8 ± 1.6 days, respectively; P < 0.05). CONCLUSIONS Transient O2 administration increases reticulocyte count after traumatic hip surgery. Hospital LOS also was shorter in the O2 group than the control group. Allogeneic red blood cell transfusion was reduced in the O2 group but it was not due to the NOP mechanism.
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Affiliation(s)
- Pierre Lafère
- Department of Anesthesiology, Centre Hospitalier Hornu-Frameries, 7301 Hornu, Belgium
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Pape A, Kutschker S, Kertscho H, Stein P, Horn O, Lossen M, Zwissler B, Habler O. The choice of the intravenous fluid influences the tolerance of acute normovolemic anemia in anesthetized domestic pigs. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2012; 16:R69. [PMID: 22546374 PMCID: PMC3681398 DOI: 10.1186/cc11324] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Revised: 03/02/2012] [Accepted: 04/30/2012] [Indexed: 11/10/2022]
Abstract
INTRODUCTION The correction of hypovolemia with acellular fluids results in acute normovolemic anemia. Whether the choice of the infusion fluid has an impact on the maintenance of oxygen (O₂) supply during acute normovolemic anemia has not been investigated so far. METHODS Thirty-six anesthetized and mechanically ventilated pigs were hemodiluted to their physiological limit of anemia tolerance, reflected by the individual critical hemoglobin concentration (Hbcrit). Hbcrit was defined as the Hb-concentration corresponding with the onset of supply-dependency of total body O₂-consumption (VO₂). The hemodilution protocol was randomly performed with either tetrastarch (6% HES 130/0.4, TS-group, n = 9), gelatin (3.5% urea-crosslinked polygeline, GEL-group, n = 9), hetastarch (6% HES 450/0.7, HS-group, n = 9) or Ringer's solution (RS-group, n = 9). The primary endpoint was the dimension of Hbcrit, secondary endpoints were parameters of central hemodynamics, O₂ transport and tissue oxygenation. RESULTS In each animal, normovolemia was maintained throughout the protocol. Hbcrit was met at 3.7 ± 0.6 g/dl (RS), 3.0 ± 0.6 g/dl (HS P < 0.05 vs. RS), 2.7 ± 0.6 g/dl (GEL, P < 0.05 vs. RS) and 2.1 ± 0.4 g/dl (TS, P < 0.05 vs. GEL, HS and RS). Hemodilution with RS resulted in a significant increase of extravascular lung water index (EVLWI) and a decrease of arterial oxygen partial pressure (paO₂), and O₂ extraction ratio was increased, when animals of the TS-, GEL- and HS-groups met their individual Hbcrit. CONCLUSIONS The choice of the intravenous fluid has an impact on the tolerance of acute normovolemic anemia induced by acellular volume replacement. Third-generation tetrastarch preparations (e.g., HES 130/0.4) appear most advantageous regarding maintenance of tissue oxygenation during progressive anemia. The underlying mechanism includes a lower degree of extravasation and favourable effects on microcirculatory function.
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Affiliation(s)
- Andreas Pape
- Clinic of Anesthesiology, Intensive Care Medicine and Pain Management, JW Goethe-University Hospital Frankfurt, Theodor-Stern-Kai 7, Frankfurt/Main, 60590, Germany.
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Leal-Noval SR, Muñoz-Gómez M, Jiménez-Sánchez M, Cayuela A, Leal-Romero M, Puppo-Moreno A, Enamorado J, Arellano-Orden V. Red blood cell transfusion in non-bleeding critically ill patients with moderate anemia: is there a benefit? Intensive Care Med 2012. [PMID: 23184038 DOI: 10.1007/s00134-012-2757-z] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
PURPOSE This study was undertaken to investigate the efficacy of red blood cell transfusion (RBCT) at reversing the deleterious effects of moderate anemia in critically ill, non-bleeding patients. METHODS This was a retrospective, pair-matched (ratio 1:1) cohort study. Non-bleeding critically ill patients with moderate anemia (nadir hemoglobin level between 70 and 95 g/l), admitted to the ICU over a 27-month period, were included. Anemic patients were included upon meeting five matching criteria of having the same nadir hemoglobin (±5 g/l), APACHE II score (±5), SOFA score (±2), admission diagnostic group, and age (±5 years). Outcome events occurring over the whole ICU stay and after RBCT were collected. After hospital discharge, all patients had a 2-year follow-up period. RESULTS Two hundred fourteen non-transfused anemic patients (NTAPs) were successfully matched with 214 transfused anemic patients (TAPs). In addition to the matching criteria, at baseline, both groups were homogenous with respect to multiple comorbidities. Compared with TAPs, NTAPs showed significantly lower rates of hospital mortality (21 vs.13 %, respectively; p < 0.05) and ICU re-admission (7.4 vs. 1.9 %, respectively; p < 0.05). Additionally, NTAPs had significantly lower rates of nosocomial infection (12.9 vs. 6.7 %, respectively; p < 0.05) and acute kidney injury (24.8 vs. 16.7 %, respectively; p < 0.05). Similar results were obtained in subgroup analysis where only more anemic patients (68 matched pairs) or patients with cardiovascular comorbidities (63 matched pairs) were considered. CONCLUSIONS RBCT does not improve the clinical outcome in non-bleeding critically ill patients with moderate anemia.
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Crescenzi G, Torracca L, Capestro F, Matteucci MLS, Rossi M. Allogenic Blood Transfusion in Cardiac Surgery. J Card Surg 2012; 27:594-9. [DOI: 10.1111/j.1540-8191.2012.01522.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Cerebral oxygen saturation measurements in red cell transfusion. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012. [PMID: 22259081 DOI: 10.1007/978-1-4614-1566-4_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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Pape A, Kertscho H, Stein P, Lossen M, Horn O, Kutschker S, Zwissler B, Habler O. Neuromuscular blockade with rocuronium bromide increases the tolerance of acute normovolemic anemia in anesthetized pigs. ACTA ACUST UNITED AC 2011; 48:16-25. [PMID: 22189343 DOI: 10.1159/000333797] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2010] [Accepted: 09/15/2011] [Indexed: 11/19/2022]
Abstract
BACKGROUND The patient's individual anemia tolerance is pivotal when blood transfusions become necessary, but are not feasible for some reason. To date, the effects of neuromuscular blockade (NMB) on anemia tolerance have not been investigated. METHODS 14 anesthetized and mechanically ventilated pigs were randomly assigned to the Roc group (3.78 mg/kg rocuronium bromide followed by continuous infusion of 1 mg/kg/min, n = 7) or to the Sal group (administration of the corresponding volume of normal saline, n = 7). Subsequently, acute normovolemic anemia was induced by simultaneous exchange of whole blood for a 6% hydroxyethyl starch solution (130/0.4) until a sudden decrease of total body O(2) consumption (VO(2)) indicated a critical limitation of O(2) transport capacity. The Hb concentration quantified at this time point (Hb(crit)) was the primary endpoint of the protocol. Secondary endpoints were parameters of hemodynamics, O(2) transport and tissue oxygenation. RESULTS Hb(crit) was significantly lower in the Roc group (2.4 ± 0.5 vs. 3.2 ± 0.7 g/dl) reflecting increased anemia tolerance. NMB with rocuronium bromide reduced skeletal muscular VO(2) and total body O(2) extraction rate. As the cardiac index increased simultaneously, total body VO(2) only decreased marginally in the Roc group (change of VO(2) relative to baseline -1.7 ± 0.8 vs. 3.2 ± 1.9% in the Sal group, p < 0.05). CONCLUSION Deep NMB with rocuronium bromide increases the tolerance of acute normovolemic anemia. The underlying mechanism most likely involves a reduction of skeletal muscular VO(2). During acellular treatment of an acute blood loss, NMB might play an adjuvant role in situations where profound stages of normovolemic anemia have to be tolerated (e.g. bridging an unexpected blood loss until blood products become available for transfusion).
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Affiliation(s)
- A Pape
- Clinic of Anesthesiology, Intensive Care Medicine and Pain Management, J.W. Goethe University Hospital, Frankfurt a.M., Germany
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Abstract
This paper reviews co-factors that impact on oxygen delivery and uptake, in the attempt to unravel the mechanisms underlying the correlation between the decrease in oxygen delivery and oxygen consumption. In sequence, the following factors are analyzed that, besides a decrease in haemoglobin concentration, impair tissue metabolism: (1) lung diffusion and perfusion limitation in oxygen transport, (2) decrease in cardiac output, (3) impairment of peripheral microvascular perfusion and (4) reduced ability of cells to extract oxygen. The contribution of the various factors is modeled aiming to present a decisional flow chart for the functional evaluation of the efficiency of the oxygen transport system.
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Affiliation(s)
- Giuseppe Miserocchi
- Dipartimento di Medicina Sperimentale, Università Milano Bicocca, Via Cadore 48, 20052 Monza, Italy.
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Ranucci M, Aronson S, Dietrich W, Dyke CM, Hofmann A, Karkouti K, Levi M, Murphy GJ, Sellke FW, Shore-Lesserson L, von Heymann C. Patient blood management during cardiac surgery: Do we have enough evidence for clinical practice? J Thorac Cardiovasc Surg 2011; 142:249.e1-32. [DOI: 10.1016/j.jtcvs.2011.04.007] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2011] [Revised: 02/09/2011] [Accepted: 04/08/2011] [Indexed: 12/13/2022]
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Ranucci M, Castelvecchio S, Ditta A, Brozzi S, Boncilli A, Baryshnikova E. Transfusions during cardiopulmonary bypass: better when triggered by venous oxygen saturation and oxygen extraction rate. Perfusion 2011; 26:327-33. [DOI: 10.1177/0267659111407539] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
During cardiopulmonary bypass (CPB), red blood cell transfusions may be required to correct dilutional anemia. The decision-making process for transfusions is usually based on the level of hemoglobin.This study investigates the hypothesis that oxygen-derived variables (mixed venous oxygen saturation, SvO2, and oxygen extraction rate, O2ER) may be more reliable predictors of the efficacy of the transfusion. Thirty-six patients for 41 transfusion episodes during CPB were retrospectively analyzed. For each patient, oxygen-derived variables, including SvO2 and O2ER, were measured before and after the transfusion. No changes in pump flow were allowed between the two measurements. The efficacy of transfusion was defined as an increase in SvO2 of at least 5%. We identified 11 transfusion episodes leading to an efficacious SvO 2 increase. Factors associated with the efficacy of the transfusion were a low SvO2 and a high O2ER. No association was found with hemoglobin values, unless for a trend for efficacy of transfusion in patients with very low (<6 g/dL) hemoglobin values. Cut-off values of 68% for SvO2 and 39% for O2ER were predictive for the efficacy of red blood cell transfusions, with a high accuracy (c-statistics 0.856 and 0.848, respectively) and negative and positive predictive values exceeding 82%. In conclusion, SvO2 and O2ER are better than the hemoglobin value for guiding the decision-making process of red blood cell transfusions to correct hemodilutional anemia during CPB.
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Affiliation(s)
- M. Ranucci
- Department of Cardiothoracic - Vascular Anesthesia and Intensive Care, IRCCS Policlinico San Donato, Milan, Italy,
| | - S. Castelvecchio
- Department of Cardiothoracic - Vascular Anesthesia and Intensive Care, IRCCS Policlinico San Donato, Milan, Italy
| | - A. Ditta
- Department of Cardiothoracic - Vascular Anesthesia and Intensive Care, IRCCS Policlinico San Donato, Milan, Italy
| | - S. Brozzi
- Department of Cardiothoracic - Vascular Anesthesia and Intensive Care, IRCCS Policlinico San Donato, Milan, Italy
| | - A. Boncilli
- Department of Cardiothoracic - Vascular Anesthesia and Intensive Care, IRCCS Policlinico San Donato, Milan, Italy
| | - E. Baryshnikova
- Department of Cardiothoracic - Vascular Anesthesia and Intensive Care, IRCCS Policlinico San Donato, Milan, Italy
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Liumbruno GM, Bennardello F, Lattanzio A, Piccoli P, Rossetti G. Recommendations for the transfusion management of patients in the peri-operative period. II. The intra-operative period. BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2011; 9:189-217. [PMID: 21527082 PMCID: PMC3096863 DOI: 10.2450/2011.0075-10] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Madrazo-González Z, García-Barrasa A, Rodríguez-Lorenzo L, Rafecas-Renau A, Alonso-Fernández G. Anemia and transfusion therapy: an update. MEDICINA INTENSIVA (ENGLISH EDITION) 2011. [PMCID: PMC7147130 DOI: 10.1016/s2173-5727(11)70007-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Anemia is one of the most prevalent diseases in the general population and is a very frequently found condition in medical and surgical patients in all medical specialties. A good evaluation of its clinical impact and its therapeutic possibilities is essential. Allogenic blood transfusion is a useful procedure in anemia management, although it has important adverse effects. It is the responsibility of the clinician to know and to take into account all the available alternatives for the treatment of anemia. Blood transfusions, erythropoiesis-stimulating agents, iron therapy (oral and endovenous) and other therapeutic alternatives must be rationally used, in accordance with the currently available clinical evidence. This review article summarizes some epidemiological characteristics of anemia, its clinical evaluation and the main therapeutic possibilities based on the present knowledge, placing special emphasis on the critically ill patient.
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42
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Prittie JE. Controversies related to red blood cell transfusion in critically ill patients. J Vet Emerg Crit Care (San Antonio) 2010; 20:167-76. [PMID: 20487245 DOI: 10.1111/j.1476-4431.2010.00521.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To review the evolution of and controversies associated with allogenic blood transfusion in critically ill patients. DATA SOURCES Veterinary and human literature review. HUMAN DATA SYNTHESIS RBC transfusion practices for ICU patients have come under scrutiny in the last 2 decades. Human trials have demonstrated relative tolerance to severe, euvolemic anemia and a significant outcome advantage following implementation of more restricted transfusion therapy. Investigators question the ability of RBCs stored longer than 2 weeks to improve tissue oxygenation, and theorize that both age and proinflammatory or immunomodulating effects of transfused cells may limit efficacy and contribute to increased patient morbidity and mortality. Also controversial is the ability of pre- and post-storage leukoreduction of RBCs to mitigate adverse transfusion-related events. VETERINARY DATA SYNTHESIS While there are several studies evaluating the transfusion trigger, the RBC storage lesion and transfusion-related immunomodulation in experimental animal models, there is little research pertaining to clinical veterinary patients. CONCLUSIONS RBC transfusion is unequivocally indicated for treatment of anemic hypoxia. However, critical hemoglobin or Hct below which all critically ill patients require transfusion has not been established and there are inherent risks associated with allogenic blood transfusion. Clinical trials designed to evaluate the effects of RBC age and leukoreduction on veterinary patient outcome are warranted. Implementation of evidence-based transfusion guidelines and consideration of alternatives to allogenic blood transfusion are advisable.
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Affiliation(s)
- Jennifer E Prittie
- Department of Emergency and Critical Care, Animal Medical Center, New York, NY 10065, USA.
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44
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Abstract
Nearly 15 million units of packed red blood cells and whole blood are transfused annually in the United States alone. Until recently, the major risks from blood transfusion were thought to be transmission of viral infections, and overall, blood transfusion was believed by most providers to be safe. A safe hemoglobin threshold above which red cell transfusion is clearly unnecessary has not been established. This article addresses the numerous problems that surround the use and consequences of blood transfusion, such as hemoglobin and hematocrit levels, oxygenation, storage time, immunomodulation, infection, and anemia. The relevant literature is comprehensively reviewed.
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Madrazo-González Z, García-Barrasa A, Rodríguez-Lorenzo L, Rafecas-Renau A, Alonso-Fernández G. [Anemia and transfusion therapy: an update]. Med Intensiva 2010; 35:32-40. [PMID: 20483506 PMCID: PMC7131500 DOI: 10.1016/j.medin.2010.03.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2010] [Revised: 03/23/2010] [Accepted: 03/29/2010] [Indexed: 12/15/2022]
Abstract
Anemia is one of the most prevalent diseases in the general population and is a very frequently found condition in medical and surgical patients in all medical specialties. A good evaluation of its clinical impact and its therapeutic possibilities is essential. Allogenic blood transfusion is a useful procedure in anemia management, although it has important adverse effects. It is the responsibility of the clinician to know and to take into account all the available alternatives for the treatment of anemia. Blood transfusions, erythropoiesis-stimulating agents, iron therapy (oral and endovenous) and other therapeutic alternatives must be rationally used, in accordance with the currently available clinical evidence. This review article summarizes some epidemiological characteristics of anemia, its clinical evaluation and the main therapeutic possibilities based on the present knowledge, placing special emphasis on the critically ill patient.
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Affiliation(s)
- Z Madrazo-González
- Servicio de Cirugía General y Aparato Digestivo, Hospital Universitario de Bellvitge, Barcelona, España.
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Flückiger C, Béchir M, Brenni M, Ludwig S, Sommerfeld J, Cottini SR, Keel M, Stocker R, Stover JF. Increasing hematocrit above 28% during early resuscitative phase is not associated with decreased mortality following severe traumatic brain injury. Acta Neurochir (Wien) 2010; 152:627-36. [PMID: 20033233 DOI: 10.1007/s00701-009-0579-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Accepted: 12/04/2009] [Indexed: 01/10/2023]
Abstract
BACKGROUND To prevent iatrogenic damage, transfusions of red blood cells should be avoided. For this, specific and reliable transfusion triggers must be defined. To date, the optimal hematocrit during the initial operating room (OR) phase is still unclear in patients with severe traumatic brain injury (TBI). We hypothesized that hematocrit values exceeding 28%, the local hematocrit target reached by the end of the initial OR phase, resulted in more complications, increased mortality, and impaired recovery compared to patients in whom hematocrit levels did not exceed 28%. METHODS Impact of hematocrit (independent variable) reached by the end of the OR phase on mortality and morbidity determined by the extended Glasgow outcome scale (eGOS; dependent variables) was investigated retrospectively in 139 TBI patients. In addition, multiple logistic regression analysis was performed to identify additional important variables. FINDINGS Following severe TBI, mortality and morbidity were neither aggravated by hematocrit above 28% reached by the end of the OR phase nor worsened by the required transfusions. Upon multiple logistic regression analysis, eGOS was significantly influenced by the highest intracranial pressure and the lowest cerebral perfusion pressure values during the initial OR phase. CONCLUSIONS Based on this retrospective observational analysis, increasing hematocrit above 28% during the initial OR phase following severe TBI was not associated with improved or worsened outcome. This questions the need for aggressive transfusion management. Prospective analysis is required to determine the lowest acceptable hematocrit value during the OR phase which neither increases mortality nor impairs recovery. For this, a larger caseload and early monitoring of cerebral metabolism and oxygenation are indispensable.
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Affiliation(s)
- Carole Flückiger
- Surgical Intensive Care Medicine, University Hospital Zürich, 8091 Zürich, Switzerland
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Abstract
This article is one of ten reviews selected from the Yearbook of Intensive Care and Emergency Medicine 2010 (Springer Verlag) and co-published as a series in Critical Care . Other articles in the series can be found online at http://ccforum.com/series/yearbook . Further information about the Yearbook of Intensive Care and Emergency Medicine is available from http://www.springer.com/series/2855 .
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Affiliation(s)
- Benoit Vallet
- Department of Anesthesiology and Intensive Care Medicine, University Hospital of Lille, Rue Michel Polonovski, Lille, France.
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48
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Clinical evidence of blood transfusion effectiveness. BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2010; 7:250-8. [PMID: 20011636 DOI: 10.2450/2008.0072-08] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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49
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Vallet B, Robin E, Lebuffe G. Venous Oxygen Saturation as a Physiologic Transfusion Trigger. Intensive Care Med 2010. [DOI: 10.1007/978-1-4419-5562-3_29] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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50
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Nagarsheth NP, Sasan F. Bloodless Surgery in Gynecologic Oncology. ACTA ACUST UNITED AC 2009; 76:589-97. [DOI: 10.1002/msj.20146] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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