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Abreu A, Máximo J, Almeida C, Lourenço A, Leite-Moreira A. The additive effects of anaemia and transfusion on long-term survival after coronary artery bypass surgery. Eur J Cardiothorac Surg 2024; 65:ezad403. [PMID: 38058180 PMCID: PMC10924300 DOI: 10.1093/ejcts/ezad403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 11/20/2023] [Accepted: 12/05/2023] [Indexed: 12/08/2023] Open
Abstract
OBJECTIVES To compare the independent and combined effects of anaemia and red blood cell transfusion on late survival after isolated coronary artery bypass grafting. METHODS Retrospective analysis of 5243 consecutive patients undergoing primary isolated coronary artery bypass grafting, performed from 2000 to 2015, in a Portuguese Academic Hospital. We identified 1649 patients with preoperative anaemia (A+) and 1422 patients who received a perioperative transfusion (T+)-the 4 possible combinations allowed for the creation of 4 subgroups (A-/T-, A-/T+, A+/T- and A+/T+). The primary endpoint was all-cause mortality at 10 years. We employed inverse probability weighting to control for confounding variables. RESULTS Thirty-one percent of the patients had preoperative anaemia, and 27.0% had at least one packed red blood cell transfusion. Inverse probability weighting was effective in eliminating differences in all significant baseline characteristics. The primary endpoint of all-cause mortality at 10 years occurred in 568 patients (20.5%) in the A-/T- group, as compared with 204 (24.4%) in the A-/T+ group (hazard ratio, 1.14; 95% confidence interval, 1.00 to 1.31; P = 0.053), 358 (33.8%) in the A+/T- group (hazard ratio, 1.53; 95% confidence interval, 1.38 to 1.71; P < 0.001), 254 (43.6%) in the A+/T+ group (hazard ratio, 2.25; 95% confidence interval, 1.97 to 2.56; P < 0.001). CONCLUSIONS This longitudinal, population-level study emphasizes the adverse long-term outcomes of preoperative anaemia and perioperative red blood cell transfusion. It stresses the importance of an evidence-based, multimodal and multidisciplinary approach to conserving blood resources and optimizing outcomes in patients at high risk for transfusion.
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Affiliation(s)
- Armando Abreu
- Department of Surgery and Physiology, Cardiovascular R&D Center—UnIC@RISE, Faculty of Medicine of the University of Porto, Porto, Portugal
- Department of Cardiothoracic Surgery, São João University Hospital Center, Porto, Portugal
| | - José Máximo
- Department of Surgery and Physiology, Cardiovascular R&D Center—UnIC@RISE, Faculty of Medicine of the University of Porto, Porto, Portugal
- Department of Cardiothoracic Surgery, São João University Hospital Center, Porto, Portugal
| | - Cláudia Almeida
- Department of Anesthesiology, São João University Hospital Center, Porto, Portugal
| | - André Lourenço
- Department of Surgery and Physiology, Cardiovascular R&D Center—UnIC@RISE, Faculty of Medicine of the University of Porto, Porto, Portugal
- Department of Anesthesiology, São João University Hospital Center, Porto, Portugal
| | - Adelino Leite-Moreira
- Department of Surgery and Physiology, Cardiovascular R&D Center—UnIC@RISE, Faculty of Medicine of the University of Porto, Porto, Portugal
- Department of Cardiothoracic Surgery, São João University Hospital Center, Porto, Portugal
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Ivascu Girardi N, Cushing MM, Evered LA, Benedetto U, Schwann TA, Kurlansky P, Habib RH, Gaudino MFL. Incidence and Impact of a Single-Unit Red Blood Cell Transfusion: Analysis of The Society of Thoracic Surgeons Database 2010-2019. Ann Thorac Surg 2023; 115:1035-1041. [PMID: 36528125 DOI: 10.1016/j.athoracsur.2022.11.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 11/10/2022] [Accepted: 11/20/2022] [Indexed: 12/23/2022]
Abstract
BACKGROUND As the adverse effects of blood transfusions are better understood, recommendations support single-unit red blood cell (RBC) transfusions (SRBCT). However, an isolated SRBCT across the entire index admission suggests even the single unit may be avoidable. We sought to identify the characteristics of cardiac surgery patients receiving an isolated SRBCT and analyze the impact on outcomes. METHODS The Society of Thoracic Surgeons Adult Cardiac Surgery Database was queried for the period between January 1, 2010, and December 31, 2019. Patients aged >18 years undergoing isolated coronary artery bypass grafting or isolated aortic valve replacement were included. A total of 2,151,430 encounters were analyzed. RESULTS Of the 847,442 patients (39.3%) receiving any RBC transfusion during their index admission, 206,555 (24.4%) received only 1 unit. Propensity-matching analysis determined SRBCT patients were significantly older (67.26 vs 64.02 years; odds ratio [OR], 1.02; P < .001), female (39.1% vs 17.8%; OR, 1.57; P < .001), non-White (18.2% vs 13.1%; OR, 0.81; P < .001), and had a smaller body surface area (1.94 vs 2.07 m2; OR, 0.20; P < .001). They also had higher mortality (1.4% vs 1.0%, P < .001), stroke (1.7% vs 1.2%, P < .001), prolonged ventilation (6.4% vs 3.4%, P < .001), renal failure (1.8% vs 0.9%, P < .001), and reoperations (1.3% vs. 0.5%, P < .001) than patients who received 0 RBCs. CONCLUSIONS SRBCT is a common occurrence in adult cardiac surgery. This low-volume transfusion is strongly associated with higher morbidity, even after controlling for preoperative risk factors.
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Affiliation(s)
| | - Melissa M Cushing
- Department of Anesthesiology, Weill Cornell Medical College, New York, New York; Department of Pathology, Weill Cornell Medical College, New York, New York
| | - Lisbeth A Evered
- Department of Anesthesiology, Weill Cornell Medical College, New York, New York
| | - Umberto Benedetto
- Department of Cardiac Surgery, University "G. d'Annunzio," Pescara, Italy
| | - Thomas A Schwann
- Division of Cardiac Surgery, Department of Surgery, University of Massachusetts Chan Medical School, Baystate Medical Center, Boston, Massachusetts
| | - Paul Kurlansky
- Department of Surgery, Columbia University College of Physician and Surgeons, New York, New York
| | - Robert H Habib
- The Society of Thoracic Surgeons Research Center, Chicago, Illinois
| | - Mario F L Gaudino
- Department of Cardiothoracic Surgery, Weill Cornell Medical College, New York, New York
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3
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Schwann TA, Vekstein AM, Engoren M, Grau-Sepulveda M, O'Brien S, Engelman D, Lobdell KW, Gaudino MF, Salenger R, Habib RH. Perioperative Anemia and Transfusions and Late Mortality in Coronary Artery Bypass Patients. Ann Thorac Surg 2023; 115:759-769. [PMID: 36574523 DOI: 10.1016/j.athoracsur.2022.11.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 08/14/2022] [Accepted: 11/08/2022] [Indexed: 11/27/2022]
Abstract
BACKGROUND Perioperative anemia and transfusions are associated with adverse operative outcomes after coronary artery bypass graft surgery (CABG). Their individual association with long-term outcomes is unclear. METHODS Patients aged 65 years and older who had undergone CABG and were in The Society of Thoracic Surgeons (STS) Adult Cardiac Surgery Database (n = 504,596) from 2011 to 2018 were linked to Centers for Medicare and Medicaid Service data to assess long-term survival. The association of intraoperative anemia defined by intraoperative nadir hematocrit (nHct) and red blood cell (RBC) transfusions, and their interactions, on long-term mortality were assessed with Kaplan-Meier estimates and multivariable Cox regression. Restricted cubic splines were used to explore the association between nHct as a continuous variable and long-term mortality. RESULTS 258,398 on-pump CABG STS Adult Cardiac Surgery Database patients surviving the perioperative period were linked to Centers for Medicare and Medicaid Service claims files. Per World Health Organization criteria, 41% had preoperative anemia. Mean intraoperative nHct was 24%; RBC transfusion rate was 43.7%. Univariable analysis associated both RBC transfusion and lower nHct with worse survival. Lower nHct was only marginally associated with risk-adjusted mortality: adjusted hazard ratio (AHR) 1.04 (95% CI, 1.01-1.06) and 1.07 (95% CI, 1.00-1.14) at nHct 20% and at nHct 14%, respectively. RBC transfusion was associated with significantly higher adjusted mortality irrespective of timing of transfusion: AHR intraoperative 1.21 (95% CI, 1.18-1.27); AHR postoperative 1.26 (95% CI, 1.22-1.30); AHR both 1.46 (95% CI, 1.40-1.52) and across all levels of nHct. RBC transfusion was not associated with improved survival at any level of nHct. CONCLUSIONS Among Medicare CABG patients, RBC transfusions were associated with increased risk-adjusted late mortality across all levels of nHct whereas intraoperative anemia was only marginally so. Tolerance of lower intraoperative nHct than currently accepted may be preferable to transfusions.
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Affiliation(s)
- Thomas A Schwann
- Department of Surgery, University of Massachusetts-Baystate, Springfield, Massachusetts.
| | - Andrew M Vekstein
- Department of Surgery, Duke University, Durham, North Carolina; Duke Clinical Research Institute, Durham, North Carolina
| | - Milo Engoren
- Department of Anesthesiology, University of Michigan, Ann Arbor, Michigan
| | | | - Sean O'Brien
- Duke Clinical Research Institute, Durham, North Carolina; Department of Biostatistics and Bioinformatics, Duke University, Durham, North Carolina
| | - Daniel Engelman
- Department of Surgery, University of Massachusetts-Baystate, Springfield, Massachusetts
| | - Kevin W Lobdell
- Department of Surgery, Atrium Health, Charlotte, North Carolina
| | - Mario F Gaudino
- Department of Surgery, Weill-Cornell Health, New York, New York
| | - Rawn Salenger
- Department of Surgery, University of Maryland, Baltimore, Maryland
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4
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Woodford SF, Butlin M, Wei B, Chao W, Avolio A. The pressure field as a methodology for fluid management and red cell preservation during cardiac surgery. J Cardiothorac Surg 2023; 18:36. [PMID: 36653847 PMCID: PMC9850517 DOI: 10.1186/s13019-023-02134-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Accepted: 01/03/2023] [Indexed: 01/19/2023] Open
Abstract
PURPOSE Anemia and red cell transfusion contribute to morbidity and mortality of surgery. The concept of patient blood management to mitigate preoperative anemia, optimize coagulation, conserve red cells intraoperatively and accept lower post-operative transfusion thresholds has recently gained widespread acceptance across a range of surgical disciplines. Fluid administration is likely to contribute significantly to perioperative anemia and red-cell transfusion requirements, yet a robust basis for managing fluid administration in this context has not been articulated. There is an urgent need for this. METHODS We developed 'the pressure field method' as a novel approach to guiding the administration of fluid and drugs to optimize tissue perfusion. The pressure field method was used for the intraoperative management of 67 patients undergoing semi-elective cardiac surgery. We compared intraoperative anemia and transfusion requirements in this cohort with a conventional group of 413 patients undergoing cardiac surgery. RESULTS In the pressure field group, no patients required transfusion whereas in the conventional group, 16% required transfusion during bypass and these patients received an average of 2.4 units of packed red cells (P < 0.0001). The average decrease in hemoglobin in the pressure field group was only 13 g/L, whereas in the conventional group it was 52 g/L (P < 0.0001). 80% of the pressure field group received no intravenous fluid during cardiac surgery, and the average intraoperative fluid load was 115 mL. CONCLUSION The pressure field method appears to reduce transfusion requirements due to decreased intraoperative fluid loading.
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Affiliation(s)
- Stephen F. Woodford
- grid.410678.c0000 0000 9374 3516Department of Anesthesia, Austin Health, Heidelberg, Australia ,Department of Anesthesia and Intensive Care, Brisbane Waters Private Hospital, 21 Vidler Ave., Woy Woy, Australia ,Department of Anesthesia and Intensive Care, Gosford Private Hospital, Burrabil Ave, Gosford, Australia ,grid.1004.50000 0001 2158 5405Faculty of Medicine, Health and Human Sciences, Macquarie Medical School, Macquarie University, Sydney, Australia
| | - Mark Butlin
- grid.1004.50000 0001 2158 5405Faculty of Medicine, Health and Human Sciences, Macquarie Medical School, Macquarie University, Sydney, Australia
| | - Bai Wei
- grid.411615.60000 0000 9938 1755Beijing Technology and Business University, Beijing, China
| | - Wei Chao
- grid.24516.340000000123704535Shanghai Tongji University, Shanghai, China
| | - Alberto Avolio
- grid.1004.50000 0001 2158 5405Faculty of Medicine, Health and Human Sciences, Macquarie Medical School, Macquarie University, Sydney, Australia
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5
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Yang SS, Al Kharusi L, Gosselin A, Chirico A, Baradari PG, Cameron MJ. Iron supplementation for patients undergoing cardiac surgery: a systematic review and meta-analysis of randomized controlled trials. Can J Anaesth 2021; 69:129-139. [PMID: 34559371 DOI: 10.1007/s12630-021-02113-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 08/11/2021] [Accepted: 08/12/2021] [Indexed: 12/29/2022] Open
Abstract
PURPOSE Iron supplementation has been evaluated in several randomized controlled trials (RCTs) for its potential to increase baseline hemoglobin and decrease red blood cell transfusion during cardiac surgery. This study's main objective was to evaluate the current evidence for iron administration in cardiac surgery patients. METHODS We searched MEDLINE, EMBASE, CENTRAL, Web of Science databases, and Google Scholar from inception to 19 November 2020 for RCTs evaluating perioperative iron administration in adult patients undergoing cardiac surgery. The RCTs were assessed using a risk of bias assessment and the quality of evidence was assessed using the grading of recommendations, assessments, development, and evaluations. RESULTS We reviewed 1,767 citations, and five studies (n = 554) met the inclusion criteria. The use of iron showed no statistical difference in incidence of transfusion (risk ratio, 0.86; 95% confidence interval, 0.65 to 1.13). Trial sequential analysis suggested an optimal information size of 1,132 participants, which the accrued information size did not reach. CONCLUSION The current literature does not support or refute the routine use of iron therapy in cardiac surgery patients. TRIAL REGISTRATION PROSPERO (CRD42020161927); registered 19 December 2019.
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Affiliation(s)
- Stephen Su Yang
- Faculty of Medicine, McGill University, Montreal, QC, Canada. .,Division of Critical Care, Department of Anesthesia, Jewish General Hospital, K1400-3755, Cote Sainte Catherine, Montreal, QC, H3T 1E2, Canada.
| | | | - Adam Gosselin
- Faculty of Medicine, McGill University, Montreal, QC, Canada
| | - Anissa Chirico
- Faculty of Medicine, McGill University, Montreal, QC, Canada
| | | | - Matthew J Cameron
- Faculty of Medicine, McGill University, Montreal, QC, Canada.,Division of Critical Care, Department of Anesthesia, Jewish General Hospital, K1400-3755, Cote Sainte Catherine, Montreal, QC, H3T 1E2, Canada
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6
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Cameron MJ, Al Kharusi L, Gosselin A, Baradari PG, Chirico A, Amar-Zifkin A, Yang SS. Iron supplementation for patients undergoing cardiac surgery: a protocol for a systematic review and meta-analysis of randomized controlled trials. CMAJ Open 2021; 9:E623-E626. [PMID: 34088733 PMCID: PMC8191589 DOI: 10.9778/cmajo.20200204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Iron administration has been evaluated in several randomized controlled trials for the potential of increasing baseline hemoglobin values and decreasing the incidence of red blood cell transfusion during cardiac surgery. We describe the protocol for a study aiming to evaluate the efficacy and safety of perioperative iron administration in patients undergoing cardiac surgery. METHODS We will search MEDLINE, Embase, the Cochrane Central Register of Controlled Trials and the Web of Science, from inception to Nov. 19, 2020, for randomized controlled trials in any language evaluating the perioperative administration of iron in adult patients undergoing cardiac surgery; we will also include the first 50 results from Google Scholar. The primary outcome will be the incidence of red blood cell transfusion from the study intervention time until 8 weeks postoperatively. The secondary outcomes will be the number of red blood cell units transfused; change in ferritin level, reticulocyte count and hemoglobin concentration after iron administration; and adverse events. We will assess the risk of bias with the Cochrane Collaboration Risk of Bias Tool, and will analyze the primary and secondary outcomes using a random-effects model. INTERPRETATION This study will summarize the current evidence about perioperative iron administration in patients undergoing cardiac surgery, help determine whether this intervention should be included in enhanced-recovery protocols, and shape future research if needed. The final manuscript will be submitted to a peer-reviewed journal. TRIAL REGISTRATION PROSPERO no. CRD42020161927.
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Affiliation(s)
- Matthew J Cameron
- Faculty of Medicine (Cameron, Gosselin, Gholipour Baradari, Chirico, Yang), McGill University; Department of Anesthesia (Cameron, Al Kharusi, Yang), McGill University; Department of Anesthesia (Cameron, Yang), Jewish General Hospital; McGill University Health Centre Medical Libraries (Amar-Zifkin), Montréal, Que.
| | - Latifa Al Kharusi
- Faculty of Medicine (Cameron, Gosselin, Gholipour Baradari, Chirico, Yang), McGill University; Department of Anesthesia (Cameron, Al Kharusi, Yang), McGill University; Department of Anesthesia (Cameron, Yang), Jewish General Hospital; McGill University Health Centre Medical Libraries (Amar-Zifkin), Montréal, Que
| | - Adam Gosselin
- Faculty of Medicine (Cameron, Gosselin, Gholipour Baradari, Chirico, Yang), McGill University; Department of Anesthesia (Cameron, Al Kharusi, Yang), McGill University; Department of Anesthesia (Cameron, Yang), Jewish General Hospital; McGill University Health Centre Medical Libraries (Amar-Zifkin), Montréal, Que
| | - Pouya Gholipour Baradari
- Faculty of Medicine (Cameron, Gosselin, Gholipour Baradari, Chirico, Yang), McGill University; Department of Anesthesia (Cameron, Al Kharusi, Yang), McGill University; Department of Anesthesia (Cameron, Yang), Jewish General Hospital; McGill University Health Centre Medical Libraries (Amar-Zifkin), Montréal, Que
| | - Anissa Chirico
- Faculty of Medicine (Cameron, Gosselin, Gholipour Baradari, Chirico, Yang), McGill University; Department of Anesthesia (Cameron, Al Kharusi, Yang), McGill University; Department of Anesthesia (Cameron, Yang), Jewish General Hospital; McGill University Health Centre Medical Libraries (Amar-Zifkin), Montréal, Que
| | - Alexandre Amar-Zifkin
- Faculty of Medicine (Cameron, Gosselin, Gholipour Baradari, Chirico, Yang), McGill University; Department of Anesthesia (Cameron, Al Kharusi, Yang), McGill University; Department of Anesthesia (Cameron, Yang), Jewish General Hospital; McGill University Health Centre Medical Libraries (Amar-Zifkin), Montréal, Que
| | - Stephen S Yang
- Faculty of Medicine (Cameron, Gosselin, Gholipour Baradari, Chirico, Yang), McGill University; Department of Anesthesia (Cameron, Al Kharusi, Yang), McGill University; Department of Anesthesia (Cameron, Yang), Jewish General Hospital; McGill University Health Centre Medical Libraries (Amar-Zifkin), Montréal, Que
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7
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Saraçoğlu A, Ezelsoy M, Saraçoğlu KT. Does Transfusion of Blood and Blood Products Increase the Length of Stay in Hospital? Indian J Hematol Blood Transfus 2019; 35:313-320. [PMID: 30988569 DOI: 10.1007/s12288-018-1039-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 10/31/2018] [Indexed: 11/30/2022] Open
Abstract
We aimed to analyze the use of blood products in cardiac surgery and to investigate its effect on clinical outcomes. Perioperative transfusion requirement, survival and complication rates and the duration of hospitalization were noted. Patients were divided into two groups considering the duration of hospital and intensive care unit (ICU) stay. The cardiopulmonary bypass time and the cross clamp time, and the amount of used cryoprecipitate, fresh frozen plasma, platelet, red blood cell and the bleeding amount were significantly higher in groups that stayed at the hospital for > 7 days and at the ICU for > 2 days (p > 0.05). In the univariate model, to predict the patients who might stay at the hospital for more than 1 week and who might stay at the ICU for more than 3 days, we considered the significant efficacy of postoperative blood transfusion, bleeding amount, and the cardiopulmonary bypass time (p < 0.05). In the reduced multivariate model, however, we analyzed the significant-independent efficacy of the postoperative fresh frozen plasma use to determine the patients who would stay at the hospital for more than 1 week and who would stay at the ICU for more than 3 days (p < 0.05). We have concluded that increased use of blood products was associated with the cross clamp and cardiopulmonary bypass time and prolonged duration of hospital and ICU stays. In open cardiac surgeries, the use of blood products due to bleeding was identified as a predictor for staying longer than 3 days at the ICU and longer than 7 days at the hospital.
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Affiliation(s)
- Ayten Saraçoğlu
- 1Department of Anesthesiology and Intensive Care, Marmara University Medical School, Istanbul, Turkey
| | - Mehmet Ezelsoy
- 2Department of Cardiovascular Surgery, Istanbul Bilim University Medical School, Istanbul, Turkey
| | - Kemal Tolga Saraçoğlu
- 3Department of Anesthesiology and Intensive Care, Health Sciences University Medical School, Derince Training and Research Hospital, Ibnisina Mh. Lojman Sk. No: 1, 41900 Derince Kocaeli, Turkey
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Mirzaei S, Hershberger PE, DeVon HA. Association Between Adverse Clinical Outcomes After Coronary Artery Bypass Grafting and Perioperative Blood Transfusions. Crit Care Nurse 2019; 39:26-35. [DOI: 10.4037/ccn2019589] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Background
Bleeding is a serious complication of coronary artery bypass grafting that often leads to blood transfusion. Approximately 50% of patients who have the surgery receive blood products, and blood transfusions play a role in adverse outcomes after the surgery.
Objective
To examine the association between perioperative blood transfusion and postoperative adverse outcomes in patients undergoing coronary artery bypass grafting.
Methods
A systematic review of the literature, via the matrix method of quality evaluation, was conducted. PubMed, CINAHL, and Science Direct databases for 2000 through 2016 were searched. Inclusion criteria were articles published in English and original research related to clinical outcomes of blood transfusion after coronary artery bypass grafting. Seventeen articles were included in the review.
Results
Mortality, both short- and long-term, was significantly higher in transfusion patients than in nontransfusion patients. Patients with transfusion of red blood cells had higher resource utilization and more complications, including infection, pneumonia, renal failure, graft occlusion, and atrial fibrillation, than did nontransfusion patients.
Conclusion
An association exists between red blood cell transfusions and adverse clinical outcomes for patients undergoing coronary artery bypass grafting. Transfusion of red blood cells is sometimes unnecessary, may be injurious, and should be used cautiously. Even a single-unit increase in perioperative red blood cell transfusions can have a significant adverse impact on outcomes. Individual benefits and risks should be weighed before transfusion to avoid adverse outcomes. Transfusion guidelines should be reviewed to include the latest evidence to guarantee the most appropriate use of blood products.
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Affiliation(s)
- Sahereh Mirzaei
- Sahereh Mirzaei is a doctoral student at the University of Illinois at Chicago, and a clinical practitioner in the open heart intensive care unit, University of Illinois at Chicago, College of Nursing, Chicago, Illinois
| | - Patricia E. Hershberger
- Patricia Hershberger is the doctoral instructor for the Developing Literature Reviews course at the University of Illinois at Chicago
| | - Holli A. DeVon
- Holli DeVon is the doctoral instructor for the Philosophy of Science and Evidence-Based Practice courses at the University of Illinois at Chicago
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9
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Lim J, Miles L, Litton E. Intravenous Iron Therapy in Patients Undergoing Cardiovascular Surgery: A Narrative Review. J Cardiothorac Vasc Anesth 2017; 32:1439-1451. [PMID: 29246691 DOI: 10.1053/j.jvca.2017.11.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Indexed: 12/26/2022]
Affiliation(s)
- Jolene Lim
- Intensive Care Unit, Fiona Stanley Hospital, Perth, Western Australia, Australia
| | - Lachlan Miles
- Department of Anaesthesia, Austin Health, Melbourne, Australia; Anaesthesia, Perioperative and Pain Medicine Unit, School of Medicine, University of Melbourne, Parkville, Australia
| | - Edward Litton
- Intensive Care Unit, Fiona Stanley Hospital, Perth, Western Australia, Australia; School of Medicine and Pharmacology, University of Western Australia, Perth, Western Australia; Australia.
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10
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Koster A, Zittermann A, Börgermann J, Gummert JF. No Significant Association Between the Transfusion of Small Volumes of Leukocyte-Depleted Red Blood Cells and Mortality Over 7 Years of Follow-up in Patients Undergoing Cardiac Surgery: A Propensity Score Matched Analysis. Anesth Analg 2017; 126:1469-1475. [PMID: 29064873 DOI: 10.1213/ane.0000000000002581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND The impact of red blood cell (RBC) transfusion on long-term clinical outcome is controversial. METHODS We prospectively recorded follow-up data of 6124 cardiac surgical patients who received no transfusion (RBC- group) or 1-2 units of leukocyte-depleted RBC (RBC+ group) at our institution. The primary end point was overall mortality up to 7 years after cardiac surgery; secondary end point was coronary artery revascularization during follow-up. To correct for nonrandomized group assignment, propensity score (PS) matching was performed. A subgroup analysis was also performed in patients with preoperative anemia. RESULTS PS matching was possible in 4118 patients. During a mean follow-up of 4.05 years (range, 0.0-7.3 years), 140 patients (14.6%) died in the RBC- group and 173 (17.2%) died in the RBC+ group. The hazard ratio for the RBC+ group versus the RBC- group was 1.00 (95% confidence interval, 0.79-1.25; P = .969). The number of revascularizations was 96 (9.9%) and 125 (10.6%), respectively, with a hazard ratio of 1.21 (95% confidence interval, 0.92-1.58; P = .166) for the RBC+ group. Preoperative anemia was not a risk factor for postoperative mortality, even when patients were transfused. CONCLUSIONS This PS-matched analysis does not provide evidence for an association of the transfusion of small volumes of leukocyte-depleted RBCs with an increased postoperative mortality in cardiac surgical patients. Moreover, preoperative anemia could not be identified as a risk factor for increased postoperative mortality.
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Affiliation(s)
| | - Armin Zittermann
- Clinic for Thoracic and Cardiovascular Surgery, Herz- und Diabeteszentrum NRW, Bad Oeynhausen, Ruhr-University of Bochum, Germany
| | - Jochen Börgermann
- Clinic for Thoracic and Cardiovascular Surgery, Herz- und Diabeteszentrum NRW, Bad Oeynhausen, Ruhr-University of Bochum, Germany
| | - Jan F Gummert
- Clinic for Thoracic and Cardiovascular Surgery, Herz- und Diabeteszentrum NRW, Bad Oeynhausen, Ruhr-University of Bochum, Germany
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11
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Klein A, Collier T, Yeates J, Miles L, Fletcher S, Evans C, Richards T. The ACTA PORT-score for predicting perioperative risk of blood transfusion for adult cardiac surgery. Br J Anaesth 2017; 119:394-401. [DOI: 10.1093/bja/aex205] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/01/2017] [Indexed: 01/09/2023] Open
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12
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Velasquez CA, Singh M, Bin Mahmood SU, Brownstein AJ, Zafar MA, Saeyeldin A, Ziganshin BA, Elefteriades JA. The Effect of Blood Transfusion on Outcomes in Aortic Surgery. Int J Angiol 2017; 26:135-142. [PMID: 28804230 DOI: 10.1055/s-0037-1604417] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The use of blood transfusion in cardiac surgery varies widely. The beneficial effects of blood products are offset by an increase in morbidity and mortality. Despite multiple studies showing an association between blood product exposure and adverse short- and long-term events, it is difficult to determine causality. Nevertheless, the implication is sufficient to warrant the search for alternative strategies to reduce the use of blood products while providing a standard of care that optimizes postoperative outcomes. Aortic surgery, in particular, is associated with an increased risk of bleeding requiring a blood transfusion. There is a paucity of evidence within aortic surgery regarding the deleterious effects of blood products. Here, we review the current evidence regarding patient outcomes after blood transfusion in cardiac surgery, with special emphasis on aortic surgery.
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Affiliation(s)
- Camilo A Velasquez
- Aortic Institute at Yale-New Haven Hospital, Yale University School of Medicine, New Haven, Connecticut
| | - Mrinal Singh
- Aortic Institute at Yale-New Haven Hospital, Yale University School of Medicine, New Haven, Connecticut
| | - Syed Usman Bin Mahmood
- Aortic Institute at Yale-New Haven Hospital, Yale University School of Medicine, New Haven, Connecticut
| | - Adam J Brownstein
- Aortic Institute at Yale-New Haven Hospital, Yale University School of Medicine, New Haven, Connecticut
| | - Mohammad A Zafar
- Aortic Institute at Yale-New Haven Hospital, Yale University School of Medicine, New Haven, Connecticut
| | - Ayman Saeyeldin
- Aortic Institute at Yale-New Haven Hospital, Yale University School of Medicine, New Haven, Connecticut
| | - Bulat A Ziganshin
- Aortic Institute at Yale-New Haven Hospital, Yale University School of Medicine, New Haven, Connecticut.,Department of Surgical Diseases #2, Kazan State Medical University, Kazan, Russia
| | - John A Elefteriades
- Aortic Institute at Yale-New Haven Hospital, Yale University School of Medicine, New Haven, Connecticut
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Rungatscher A, Milani E, Covajes C, Hallström S, Gottin L, Guidi GC, Luciani GB, Faggian G. Blood transfusions may impair endothelium-dependent vasodilatation during coronary artery bypass surgery. Microvasc Res 2017; 112:109-114. [PMID: 28385576 DOI: 10.1016/j.mvr.2017.04.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 02/21/2017] [Accepted: 04/01/2017] [Indexed: 11/19/2022]
Abstract
OBJECTIVE The hemolytic product free-hemoglobin (fHb) reduces nitric oxide (NO) bioavailability. The present study aims to establish whether administration of different blood transfusions result in increased circulating fHb levels and NO consumption with effects on arterial NO-dependent blood flow in patients undergoing CABG surgery. METHODS Ninety-five consecutive patients undergoing elective CABG surgery were prospectively divided in four groups based on blood transfusion requirements during surgery: stored blood cells (SBC, n. 21), intraoperative autologous salvaged blood (ASB, n. 25), SBC and ASB (n.22), no transfusion (control, n. 27). Blood samples were collected before and after intervention to analyse plasma levels of fHb and NO consumption. Endothelium-dependent relaxation was assessed in left internal mammary artery (LIMA) rings harvested before chest closure. Peripheral artery tonometry was assessed after intervention. RESULTS Transfusions with SBC increased plasma fHb (p<0.05). Transfusions of ASB resulted in higher plasma fHb compared to SBC (p<0.01). fHb concentrations directly correlated with NO consumption (r=0.65, p<0.001). Maximal endothelium-dependent relaxation in LIMA was significantly attenuated in SBC and ASB patients compared to control (15.2±3.1% vs 21.1±2.5% vs 43±5.0% respectively; p<0.01). Significant correlations were identified between the aortic pressure wave velocity, plasma fHb concentration and NO consumption (p<0.01). CONCLUSIONS Intraoperative blood transfusions and particularly autologous salvaged blood impair endothelium-dependent relaxation through NO scavenging by fHb. These findings obtained in vitro and in vivo provide new insights into the adverse relation between blood transfusions and patient outcome.
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Affiliation(s)
- Alessio Rungatscher
- Department of Surgery, Division of Cardiac Surgery, University of Verona, Verona, Italy.
| | - Elisabetta Milani
- Department of Surgery, Division of Cardiac Surgery, University of Verona, Verona, Italy
| | - Cecilia Covajes
- Department of Surgery, Division of Cardiac Surgery, University of Verona, Verona, Italy
| | - Seth Hallström
- Institute of Physiological Chemistry, Medical University of Graz, Graz, Austria.
| | - Leonardo Gottin
- Department of Surgery, Division of Cardiac Surgery, University of Verona, Verona, Italy
| | - Gian Cesare Guidi
- Division of Clinical Biochemistry and Molecular Biology, University of Verona, Verona, Italy
| | | | - Giuseppe Faggian
- Department of Surgery, Division of Cardiac Surgery, University of Verona, Verona, Italy
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Toma de decisiones en cirugía coronaria. Indicaciones y resultados del tratamiento quirúrgico del paciente con cardiopatía isquémica. CIRUGIA CARDIOVASCULAR 2017. [DOI: 10.1016/j.circv.2017.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Anderson BR, Blancha VL, Duchon JM, Chai PJ, Kalfa D, Bacha EA, Krishnamurthy G, Ratner V. The effects of postoperative hematocrit on shunt occlusion for neonates undergoing single ventricle palliation. J Thorac Cardiovasc Surg 2016; 153:947-955. [PMID: 27938905 DOI: 10.1016/j.jtcvs.2016.09.085] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 09/20/2016] [Accepted: 09/28/2016] [Indexed: 12/22/2022]
Abstract
OBJECTIVES Our primary objective was to test the effects of first postoperative hematocrit on early shunt occlusion for children undergoing systemic to pulmonary artery shunt placement. Because any intervention to reduce shunt occlusion is only beneficial if it reduces mortality or is, at least, mortality neutral, we also tested the effects of first postoperative hematocrit on in-hospital mortality. METHODS We conducted a retrospective study on all neonates who underwent primary systemic to pulmonary artery shunt placement, with or without a Norwood/Damus-Kaye-Stansel procedure, at Columbia University Medical Center between January 2010 and July 2015. Univariable regression was used to test the effects of first postoperative hematocrit on early shunt occlusion and 30-day mortality, clustering standard errors by surgeon. In secondary analyses, we also tested associations between red blood cell transfusion volumes in the first 24 postoperative hours and first postoperative hematocrit, shunt occlusion, and mortality. RESULTS Eighty infants met inclusion criteria. Median initial postoperative hematocrit was 41.7% (interquartile range, 37.9-46.0). Six infants (7.5%) died. Four infants (5.0%) died within the first 30 days. Five infants (6.3%) experienced early shunt occlusion. No children with early shunt occlusion died. In univariable models, for every 5 additional percentage points of hematocrit, an infant's odds of early shunt occlusion more than doubled (odds ratio, 2.70; P = .009). The odds of all-cause 30-day mortality remained unchanged. CONCLUSIONS Higher postoperative hematocrit levels are associated with early shunt occlusions in infants undergoing primary systemic to pulmonary artery shunt placement. Multicenter investigations are warranted to validate these findings and to determine ideal postoperative hematocrit targets for this population.
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Affiliation(s)
- Brett R Anderson
- Division of Pediatric Cardiology, NewYork-Presbyterian/Morgan Stanley Children's Hospital, Columbia University Medical Center, New York, NY.
| | | | - Jennifer M Duchon
- Division of Pediatric Infectious Disease, NewYork-Presbyterian/Morgan Stanley Children's Hospital, New York, NY
| | - Paul J Chai
- Division of Cardiothoracic Surgery, Columbia University College of Physicians and Surgeons, New York, NY
| | - David Kalfa
- Division of Cardiothoracic Surgery, Columbia University College of Physicians and Surgeons, New York, NY
| | - Emile A Bacha
- Division of Cardiothoracic Surgery, Columbia University College of Physicians and Surgeons, New York, NY
| | - Ganga Krishnamurthy
- Division of Neonatology, NewYork-Presbyterian/Morgan Stanley Children's Hospital, Columbia University Medical Center, New York, NY
| | - Veniamin Ratner
- Division of Neonatology, NewYork-Presbyterian/Morgan Stanley Children's Hospital, Columbia University Medical Center, New York, NY
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Schwann TA, Habib JR, Khalifeh JM, Nauffal V, Bonnell M, Clancy C, Engoren MC, Habib RH. Effects of Blood Transfusion on Cause-Specific Late Mortality After Coronary Artery Bypass Grafting—Less Is More. Ann Thorac Surg 2016; 102:465-73. [DOI: 10.1016/j.athoracsur.2016.05.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 03/18/2016] [Accepted: 05/02/2016] [Indexed: 01/06/2023]
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Predicted Risk of Mortality, Transfusion, and Postoperative Outcomes in Isolated Primary Valve Operations. Ann Thorac Surg 2016; 101:620-4. [DOI: 10.1016/j.athoracsur.2015.08.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 08/03/2015] [Accepted: 08/07/2015] [Indexed: 11/17/2022]
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18
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More Data Are Needed to Determine an Association Between Transfusions and Coronary Artery Bypass Graft Occlusion. Ann Thorac Surg 2015; 100:1135. [PMID: 26354661 DOI: 10.1016/j.athoracsur.2015.04.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2015] [Revised: 04/05/2015] [Accepted: 04/08/2015] [Indexed: 11/23/2022]
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19
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Engoren M, Schwann TA, Jewell E, Neill S, Benedict P, Likosky DS, Habib RH. Reply: To PMID 25497075. Ann Thorac Surg 2015; 100:1135-6. [PMID: 26354660 DOI: 10.1016/j.athoracsur.2015.04.134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2015] [Revised: 04/26/2015] [Accepted: 04/30/2015] [Indexed: 11/28/2022]
Affiliation(s)
- Milo Engoren
- Department of Anesthesiology, University of Michigan, Ann Arbor, MI; Department of Anesthesiology, Mercy St. Vincent Medical Center, Toledo, OH.
| | - Thomas A Schwann
- Department of Cardiothoracic Surgery, University of Toledo, Toledo, OH
| | - Elizabeth Jewell
- Department of Anesthesiology, University of Michigan, Ann Arbor, MI
| | - Sean Neill
- Department of Anesthesiology, University of Michigan, Ann Arbor, MI
| | - Patrick Benedict
- Department of Anesthesiology, University of Michigan, Ann Arbor, MI
| | - Donald S Likosky
- Section of Health Services Research and Quality, Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI
| | - Robert H Habib
- Department of Internal Medicine, Outcomes Research Unit, American University of Beirut, Beirut, Lebanon
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Tan TW, Eslami M, Rybin D, Doros G, Zhang WW, Farber A. Blood transfusion is associated with increased risk of perioperative complications and prolonged hospital duration of stay among patients undergoing amputation. Surgery 2015; 158:1609-16. [PMID: 26094176 DOI: 10.1016/j.surg.2015.04.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 04/09/2015] [Accepted: 04/22/2015] [Indexed: 01/28/2023]
Abstract
OBJECTIVE We evaluated the outcomes of patients undergoing major lower-extremity amputation who received packed red blood cell transfusion. METHODS Using the dataset of the National Surgical Quality Improvement Program (2005-2011), we examined 5,739 above-knee and 6,725 below-knee amputations. Patients were stratified by perioperative (preoperative, intraoperative, or postoperative) blood transfusion. Outcomes included perioperative mortality, myocardial infarction (MI), thromboembolism, and duration of stay (DOS) at the hospital. Adjusted comparisons of outcomes between transfused and not-transfused patients were performed by matching the 2 groups for age, smoking, diabetes, renal failure, coronary artery disease, classification of the American Society of Anesthesiologists, functional status, and procedure type. Multivariable logistic and gamma regression were used to examine associations between transfusion and outcomes. RESULTS Of the 12,464 amputations in the study cohort 2,133 (17%) required transfusion. The majority of the cases were performed for critical limb ischemia (8,205 amputations; 66%) and the overall 30-days mortality was 9%. In both crude and matched cohorts, although perioperative mortality and cardiac complication rates were similar, transfusion was associated with a greater incidence of pneumonia (crude: 6.1% vs 3%, P < .001; matched: 5.9% vs 3.7%, P < .001), thromboembolism (2.5% vs 1.6%, P = .003; 2.5% vs 1.4%, P = .002) and longer DOS (18 ± 19 vs 13.6 ± 14.3 days, P < .001; 17.8 ± 18.4 vs 14.2 ± 14.5 days, P < .001). Multivariable adjustment for confounding variables in the crude cohort demonstrated that transfusion was independently associated with a greater odds of perioperative pneumonia (odds ratio [OR]:1.6; 95% confidence interval [CI]:1.3-2; P < .001), thromboembolism (OR 1.3, 95% CI 1.0-1.9, P = .09) and longer DOS (mean ratio: 1.1; 95% CI 1.1-1.6; P = .006). CONCLUSION Among patients who had major lower-extremity amputation, perioperative transfusion independently predicted greater risks for perioperative pneumonia, thromboembolism, and prolonged hospital DOS.
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Affiliation(s)
- Tze-Woei Tan
- Louisiana State University Health Shreveport, Shreveport, LA.
| | | | - Denis Rybin
- Boston University Medical Center, Boston, MA
| | | | - Wayne W Zhang
- Louisiana State University Health Shreveport, Shreveport, LA
| | - Alik Farber
- Boston University Medical Center, Boston, MA
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Elhenawy AM, Meyer SR, Bagshaw SM, MacArthur RG, Carroll LJ. Role of preoperative intravenous iron therapy to correct anemia before major surgery: study protocol for systematic review and meta-analysis. Syst Rev 2015; 4:29. [PMID: 25874460 PMCID: PMC4369835 DOI: 10.1186/s13643-015-0016-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Accepted: 02/24/2015] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Preoperative anemia is a common and potentially serious hematological problem in elective surgery and increases the risk for perioperative red blood cell (RBC) transfusion. Transfusion is associated with postoperative morbidity and mortality. Preoperative intravenous (IV) iron therapy has been proposed as an intervention to reduce perioperative transfusion; however, studies are generally small, limited, and inconclusive. METHODS/DESIGN We propose performing a systematic review and meta-analysis. We will search MEDLINE, EMBASE, EBM Reviews, Cochrane-controlled trial registry, Scopus, registries of health technology assessment and clinical trials, Web of Science, ProQuest Dissertations and Theses, and conference proceedings in transfusion, hematology, and surgery. We will contact our study drug manufacturer for unpublished trials. Titles and abstracts will be identified and assessed by two reviewers for potential relevance. Eligible studies are: randomized or quasi-randomized clinical trials comparing preoperative administration of IV iron with placebo or standard of care to reduce perioperative blood transfusion in anemic patients undergoing major surgery. Screening, data extraction, and quality appraisal will be conducted independently by two authors. Data will be presented in evidence tables and in meta-analytic forest plots. Primary efficacy outcomes are change in hemoglobin concentration and proportion of patients requiring RBC transfusion. Secondary outcomes include number of units of blood or blood products transfused perioperatively, transfusion-related acute lung injury, neurologic complications, adverse events, postoperative infections, cardiopulmonary complications, intensive care unit (ICU) admission/readmission, length of hospital stay, acute kidney injury, and mortality. Dichotomous outcomes will be reported as pooled relative risks and 95% confidence intervals. Continuous outcomes will be reported using calculated weighted mean differences. Meta-regression will be performed to evaluate the impact of potential confounding variables on study effect estimates. DISCUSSION Reducing unnecessary RBC transfusions in perioperative medicine is a clinical priority. This involves the identification of patients at risk of receiving transfusions along with blood conservation strategies. Of potential pharmacological blood conservation strategies, IV iron is a compelling intervention to treat preoperative anemia; however, existing data are uncertain. We propose performing a systematic review and meta-analysis evaluating the efficacy and safety of IV iron administration to anemic patients undergoing major surgery to reduce transfusion and perioperative morbidity and mortality. SYSTEMATIC REVIEW REGISTRATION PROSPERO CRD42015016771.
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Affiliation(s)
- Abdelsalam M Elhenawy
- School of Public Health, University of Alberta, 4075 RTF, 8308 114 Street, Edmonton, Alberta, T6G 2E1, Canada.
| | - Steven R Meyer
- Division of Cardiac Surgery, Department of Cardiac Surgery, Faculty of Medicine and Dentistry, University of Alberta, 8440-112 Street, Edmonton, Alberta, T6G 2B7, Canada.
| | - Sean M Bagshaw
- Division of Critical Care Medicine, Faculty of Medicine and Dentistry, University of Alberta, 2-124 Clinical Sciences Building 8440-112 Street, Edmonton, Alberta, T6G 2B7, Canada.
| | - Roderick G MacArthur
- Division of Cardiac Surgery, Department of Cardiac Surgery, Faculty of Medicine and Dentistry, University of Alberta, 8440-112 Street, Edmonton, Alberta, T6G 2B7, Canada.
| | - Linda J Carroll
- School of Public Health, University of Alberta, 4075 RTF, 8308 114 Street, Edmonton, Alberta, T6G 2E1, Canada.
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