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Mendrala K, Czober T, Darocha T, Hudziak D, Podsiadło P, Kosiński S, Jagoda B, Gocoł R. Hemolysis during open heart surgery in patients with hereditary spherocytosis - systematic review of the literature and case study. Perioper Med (Lond) 2024; 13:54. [PMID: 38858770 PMCID: PMC11163860 DOI: 10.1186/s13741-024-00411-w] [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: 09/02/2023] [Accepted: 05/27/2024] [Indexed: 06/12/2024] Open
Abstract
BACKGROUND Due to the distinctive nature of cardiac surgery, patients suffering from hereditary spherocytosis (HS) are potentially at a high risk of perioperative complications resulting from hemolysis. Despite being the most prevalent cause of hereditary chronic hemolysis, the standards of surgical management are based solely on expert opinion. OBJECTIVE We analyze the risk of hemolysis in HS patients after cardiac surgery based on a systematic review of the literature. We also describe a case of a patient with hereditary spherocytosis who underwent aortic valve repair. METHODS This systematic review was registered in the PROSPERO international prospective register of systematic reviews (CRD42023417666) and included records from Embase, MEDLINE, Web of Science, and Google Scholar databases. The case study investigates a 38-year-old patient who underwent surgery for an aortic valve defect in mid-2022. RESULTS Of the 787 search results, 21 studies describing 23 cases of HS undergoing cardiac surgery were included in the final analysis. Hemolysis was diagnosed in five patients (one coronary artery bypass graft surgery, two aortic valve bioprosthesis, one ventricular septal defect closure, and one mitral valve plasty). None of the patients died in the perioperative period. Also, no significant clinical hemolysis was observed in our patient during the perioperative period. CONCLUSIONS The literature data show that hemolysis is not common in patients with HS undergoing various cardiac surgery techniques. The typical management of a patient with mild/moderate HS does not appear to increase the risk of significant clinical hemolysis. Commonly accepted beliefs about factors inducing hemolysis during cardiac surgery may not be fully justified and require further investigation.
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Affiliation(s)
- Konrad Mendrala
- Department of Anaesthesiology and Intensive Care, Medical University of Silesia, Katowice, Poland.
| | - Tomasz Czober
- Department of Anaesthesiology and Intensive Care, Medical University of Silesia, Katowice, Poland
| | - Tomasz Darocha
- Department of Anaesthesiology and Intensive Care, Medical University of Silesia, Katowice, Poland
| | - Damian Hudziak
- Department of Cardiac Surgery, Upper-Silesian Medical Centre, Medical University of Silesia, Katowice, Poland
| | - Paweł Podsiadło
- Department of Emergency Medicine, Jan Kochanowski University, Kielce, Poland
| | - Sylweriusz Kosiński
- Department of Intensive Interdisciplinary Therapy, Jagiellonian University Collegium Medicum, Krakow, Poland
| | - Bogusz Jagoda
- Department of Anaesthesiology and Intensive Care, Medical University of Silesia, Katowice, Poland
| | - Radosław Gocoł
- Department of Cardiac Surgery, Upper-Silesian Medical Centre, Medical University of Silesia, Katowice, Poland
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Abbasciano RG, Tomassini S, Roman MA, Rizzello A, Pathak S, Ramzi J, Lucarelli C, Layton G, Butt A, Lai F, Kumar T, Wozniak MJ, Murphy GJ. Effects of interventions targeting the systemic inflammatory response to cardiac surgery on clinical outcomes in adults. Cochrane Database Syst Rev 2023; 10:CD013584. [PMID: 37873947 PMCID: PMC10594589 DOI: 10.1002/14651858.cd013584.pub2] [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] [Indexed: 10/25/2023]
Abstract
BACKGROUND Organ injury is a common and severe complication of cardiac surgery that contributes to the majority of deaths. There are no effective treatment or prevention strategies. It has been suggested that innate immune system activation may have a causal role in organ injury. A wide range of organ protection interventions targeting the innate immune response have been evaluated in randomised controlled trials (RCTs) in adult cardiac surgery patients, with inconsistent results in terms of effectiveness. OBJECTIVES The aim of the review was to summarise the results of RCTs of organ protection interventions targeting the innate immune response in adult cardiac surgery. The review considered whether the interventions had a treatment effect on inflammation, important clinical outcomes, or both. SEARCH METHODS CENTRAL, MEDLINE, Embase, conference proceedings and two trial registers were searched on October 2022 together with reference checking to identify additional studies. SELECTION CRITERIA RCTs comparing organ protection interventions targeting the innate immune response versus placebo or no treatment in adult patients undergoing cardiac surgery where the treatment effect on innate immune activation and on clinical outcomes of interest were reported. DATA COLLECTION AND ANALYSIS Searches, study selection, quality assessment, and data extractions were performed independently by pairs of authors. The primary inflammation outcomes were peak IL-6 and IL-8 concentrations in blood post-surgery. The primary clinical outcome was in-hospital or 30-day mortality. Treatment effects were expressed as risk ratios (RR) and standardised mean difference (SMD) with 95% confidence intervals (CI). Meta-analyses were performed using random effects models, and heterogeneity was assessed using I2. MAIN RESULTS A total of 40,255 participants from 328 RCTs were included in the synthesis. The effects of treatments on IL-6 (SMD -0.77, 95% CI -0.97 to -0.58, I2 = 92%) and IL-8 (SMD -0.92, 95% CI -1.20 to -0.65, I2 = 91%) were unclear due to heterogeneity. Heterogeneity for inflammation outcomes persisted across multiple sensitivity and moderator analyses. The pooled treatment effect for in-hospital or 30-day mortality was RR 0.78, 95% CI 0.68 to 0.91, I2 = 0%, suggesting a significant clinical benefit. There was little or no treatment effect on mortality when analyses were restricted to studies at low risk of bias. Post hoc analyses failed to demonstrate consistent treatment effects on inflammation and clinical outcomes. Levels of certainty for pooled treatment effects on the primary outcomes were very low. AUTHORS' CONCLUSIONS A systematic review of RCTs of organ protection interventions targeting innate immune system activation did not resolve uncertainty as to the effectiveness of these treatments, or the role of innate immunity in organ injury following cardiac surgery.
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Affiliation(s)
| | | | - Marius A Roman
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
| | - Angelica Rizzello
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
| | - Suraj Pathak
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
| | - Joussi Ramzi
- Leicester Medical School, University of Leicester, Leicester, UK
| | - Carla Lucarelli
- Department of Cardiac Surgery, University of Verona, Verona, Italy
| | - Georgia Layton
- University Hospitals of Leicester NHS Trust, Leicester, UK
| | - Ayesha Butt
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
| | - Florence Lai
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
| | - Tracy Kumar
- Leicester Clinical Trials Unit, University of Leicester, Leicester, UK
| | - Marcin J Wozniak
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
| | - Gavin J Murphy
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
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Bhirowo YP, Raksawardana YK, Setianto BY, Sudadi S, Tandean TN, Zaharo AF, Ramsi IF, Kusumawardani HT, Triyono T. Hemolysis and cardiopulmonary bypass: meta-analysis and systematic review of contributing factors. J Cardiothorac Surg 2023; 18:291. [PMID: 37833747 PMCID: PMC10571250 DOI: 10.1186/s13019-023-02406-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Accepted: 09/30/2023] [Indexed: 10/15/2023] Open
Abstract
BACKGROUND The use of cardiopulmonary bypass (CPB) is almost inevitable in cardiac surgery. However, it can cause complications, including hemolysis. Until now, there have not been any standards for reducing hemolysis from CPB. Therefore, this systematic review was conducted to determine the factors that increase or reduce hemolysis in the use of CPB. METHODS Keywords Earches (cardiac surgery AND cardiopulmonary bypass AND hemolysis) were done on PubMed databases and Cochrane CENTRAL from 1990-2021 for published randomized controlled trials (RCTs) that studied interventions on CPB, in cardiac surgery patients, and measured hemolysis as one of the outcomes. Studies involving patients with preoperative hematological disorders, prosthetic valves, preoperative use of intra-aortic balloon pumps and extracorporeal circulation, emergency and minimally invasive surgery are excluded RESULTS: The search yielded 64 studies that met the inclusion criteria, which involved a total of 3,434 patients. The most common surgery was coronary revascularization (75%). Out of 64 studies, 33 divided into 7 analyses. Remaining 31 studies were synthesized qualitatively. Significant decreases were found in centrifugal vs roller pumps for PFHb (p = 0.0006) and Hp (p < 0.0001) outcomes, separated vs combined suctioned blood (p = 0.003), CPB alternatives vs conventional CPB (p < 0.0001), and mini extracorporeal circulation (MiniECC) vs conventional CPB for LDH (p = 0.0008). Significant increases were found in pulsatility (p = 0.03) and vacuum-assisted venous drainage (VAVD) vs gravity-assisted venous drainage (GAVD) (p = 0.002). CONCLUSION The review shows that hemolysis could be caused by several factors and efforts have been made to reduce it, combining significant efforts could be beneficial. However, this review has limitations, such as heterogeneity due to no standards available for conducting CPB. Therefore, further research with standardized guidelines for CPB is needed to yield more comparable studies. Meta-analyses with more specific parameters should be done to minimize heterogeneity.
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Affiliation(s)
- Yudo P Bhirowo
- Department of Anesthesiology and Intensive Care, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito General Hospital, Jl. Kesehatan No. 1, Sendowo, Sekip Utara, Depok District, Sleman Regency, Yogyakarta, 55281, Indonesia.
| | - Yusuf K Raksawardana
- Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Budi Y Setianto
- Department of Cardiology, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito General Hospital, Yogyakarta, Indonesia
| | - Sudadi Sudadi
- Department of Anesthesiology and Intensive Care, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito General Hospital, Jl. Kesehatan No. 1, Sendowo, Sekip Utara, Depok District, Sleman Regency, Yogyakarta, 55281, Indonesia
| | - Tommy N Tandean
- Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Alfia F Zaharo
- Department of Ophthalmology, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito General Hospital, Yogyakarta, Indonesia
| | - Irhash F Ramsi
- Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Hening T Kusumawardani
- Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Teguh Triyono
- Department of Clinical Pathology and Laboratory Medicine, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Dr. Sardjito General Hospital, Yogyakarta, Indonesia
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Hanekop G, Kollmeier JM, Frahm J, Iwanowski I, Khabbazzadeh S, Kutschka I, Tirilomis T, Ulrich C, Friedrich MG. Turbulence in surgical suction heads as detected by MRI. THE JOURNAL OF EXTRA-CORPOREAL TECHNOLOGY 2023; 55:70-81. [PMID: 37378439 DOI: 10.1051/ject/2023015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 04/06/2023] [Indexed: 06/29/2023]
Abstract
BACKGROUND Blood loss is common during surgical procedures, especially in open cardiac surgery. Allogenic blood transfusion is associated with increased morbidity and mortality. Blood conservation programs in cardiac surgery recommend re-transfusion of shed blood directly or after processing, as this decreases transfusion rates of allogenic blood. But aspiration of blood from the wound area is often associated with increased hemolysis, due to flow induced forces, mainly through development of turbulence. METHODS We evaluated magnetic resonance imaging (MRI) as a qualitative tool for detection of turbulence. MRI is sensitive to flow; this study uses velocity-compensated T1-weighted 3D MRI for turbulence detection in four geometrically different cardiotomy suction heads under comparable flow conditions (0-1250 mL/min). RESULTS Our standard control suction head Model A showed pronounced signs of turbulence at all flow rates measured, while turbulence was only detectable in our modified Models 1-3 at higher flow rates (Models 1 and 3) or not at all (Model 2). CONCLUSIONS The comparison of flow performance of surgical suction heads with different geometries via acceleration-sensitized 3D MRI revealed significant differences in turbulence development between our standard control Model A and the modified alternatives (Models 1-3). As flow conditions during measurement have been comparable, the specific geometry of the respective suction heads must have been the main factor responsible. The underlying mechanisms and causative factors can only be speculated about, but as other investigations have shown, hemolytic activity is positively associated with degree of turbulence. The turbulence data measured in this study correlate with data from other investigations about hemolysis induced by surgical suction heads. The experimental MRI technique used showed added value for further elucidating the underlying physical phenomena causing blood damage due to non-physiological flow.
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Affiliation(s)
- Gunnar Hanekop
- Department of Anesthesiology, Intensive Care, Emergency Medicine, Pain Therapy, University Medicine, Georg-August-University, Robert-Koch-Strasse 40, 37075 Goettingen, Germany
| | - Jost M Kollmeier
- Max-Planck-Institute for Multidisciplinary Sciences, Am Faßberg 11, 37077 Goettingen, Germany
| | - Jens Frahm
- Max-Planck-Institute for Multidisciplinary Sciences, Am Faßberg 11, 37077 Goettingen, Germany
| | - Ireneusz Iwanowski
- Department of Heart-Thoracic- and Vascular-Surgery, University Medicine, Georg-August-University, Robert-Koch-Strasse 40, 37075 Goettingen, Germany
| | - Sepideh Khabbazzadeh
- Department of Anesthesiology, Intensive Care, Emergency Medicine, Pain Therapy, University Medicine, Georg-August-University, Robert-Koch-Strasse 40, 37075 Goettingen, Germany
| | - Ingo Kutschka
- Department of Heart-Thoracic- and Vascular-Surgery, University Medicine, Georg-August-University, Robert-Koch-Strasse 40, 37075 Goettingen, Germany
| | - Theodor Tirilomis
- Department of Heart-Thoracic- and Vascular-Surgery, University Medicine, Georg-August-University, Robert-Koch-Strasse 40, 37075 Goettingen, Germany
| | - Christian Ulrich
- Department of Heart-Thoracic- and Vascular-Surgery, University Medicine, Georg-August-University, Robert-Koch-Strasse 40, 37075 Goettingen, Germany
| | - Martin G Friedrich
- Department of Heart-Thoracic- and Vascular-Surgery, University Medicine, Georg-August-University, Robert-Koch-Strasse 40, 37075 Goettingen, Germany
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Nitric Oxide Attenuates the Inflammatory Effects of Air During Extracorporeal Circulation. ASAIO J 2021; 66:818-824. [PMID: 31425266 DOI: 10.1097/mat.0000000000001057] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Cardiopulmonary bypass causes a systemic inflammatory response reaction that may contribute to postoperative complications. One cause relates to the air/blood interface from the extracorporeal circuit. The modulatory effects of blending nitric oxide (NO) gas into the ventilation/sweep gas of the membrane lung was studied in a porcine model of air-induced inflammation in which NO gas was added and compared with controls with or without an air/blood interface. Healthy swine were supported on partial bypass under four different test conditions. Group 1: no air exposure, group 2: air alone, group 3: air plus 50 ppm NO, and group 4: air plus 500 ppm NO. The NO gas was blended into the ventilation/sweep site of the membrane lung. The platelets and leucocytes were activated by air alone. Addition of NO to the sweep gas attenuated the inflammatory response created by the air/blood interface in this model.
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Carr BD, Johnson TJ, Gomez-Rexrode A, Mohammed A, Coughlin M, Toomasian JM, Rojas-Pena A, Bartlett RH, Haft JW. Inflammatory Effects of Blood-Air Interface in a Porcine Cardiopulmonary Bypass Model. ASAIO J 2020; 66:72-78. [PMID: 30585871 DOI: 10.1097/mat.0000000000000938] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Cardiopulmonary bypass (CPB) causes a systemic inflammatory response syndrome (SIRS) associated with multiorgan injury. A model was developed to test whether a blood-air interface (BAI) in the CPB circuit causes blood element activation and inflammation. Ten healthy swine were placed on partial CPB for 2 hours via the cervical vessels and monitored for 96 hours postoperatively. Five pigs (control group) had minimal air exposure in the circuit, while five were exposed to a BAI simulating cardiotomy suction. There were no significant differences in bypass flow or hemodynamics between the groups. In the BAI group, there was an increase in hemolysis after bypass (plasma-free hemoglobin 5.27 ± 1.2 vs. 0.94 ± 0.8 mg/dl; p = 0.01), more aggressive platelet consumption (28% vs. 83% of baseline; p = 0.009), leukocyte consumption (71% vs. 107% of baseline; p = 0.02), and increased granulocyte CD11b expression (409% vs. 106% of baseline; p = 0.009). These data suggest the inflammatory pattern responsible for the CPB-SIRS phenomenon may be driven by blood-air interaction. Future efforts should focus on BAI-associated mechanisms for minimizing blood trauma and inflammation during CPB.
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Affiliation(s)
- Benjamin D Carr
- From the Extracorporeal Life Support Laboratory, Department of Surgery, Michigan Medicine, University of Michigan, Ann Arbor, Michigan
| | - Thomas J Johnson
- From the Extracorporeal Life Support Laboratory, Department of Surgery, Michigan Medicine, University of Michigan, Ann Arbor, Michigan
| | - Amalia Gomez-Rexrode
- From the Extracorporeal Life Support Laboratory, Department of Surgery, Michigan Medicine, University of Michigan, Ann Arbor, Michigan
| | - Azmath Mohammed
- From the Extracorporeal Life Support Laboratory, Department of Surgery, Michigan Medicine, University of Michigan, Ann Arbor, Michigan
| | - Megan Coughlin
- From the Extracorporeal Life Support Laboratory, Department of Surgery, Michigan Medicine, University of Michigan, Ann Arbor, Michigan
| | - John M Toomasian
- From the Extracorporeal Life Support Laboratory, Department of Surgery, Michigan Medicine, University of Michigan, Ann Arbor, Michigan
| | - Alvaro Rojas-Pena
- From the Extracorporeal Life Support Laboratory, Department of Surgery, Michigan Medicine, University of Michigan, Ann Arbor, Michigan
| | - Robert H Bartlett
- From the Extracorporeal Life Support Laboratory, Department of Surgery, Michigan Medicine, University of Michigan, Ann Arbor, Michigan
| | - Jonathan W Haft
- Department of Cardiac Surgery, Michigan Medicine, University of Michigan, Ann Arbor, Michigan
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Toomasian CJ, Aiello SR, Drumright BL, Major TC, Bartlett RH, Toomasian JM. The effect of air exposure on leucocyte and cytokine activation in an in-vitro model of cardiotomy suction. Perfusion 2018; 33:538-545. [DOI: 10.1177/0267659118766157] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Introduction: Cardiopulmonary bypass (CPB) is known to cause a systemic inflammatory and immune response. Objective: An in-vitro model of cardiotomy suction was designed to quantify the effects of incrementally increased air-blood exposure on leucocyte marker CD11b and cytokine activation in two common anticoagulants, heparin and citrate. Methods: Fresh human blood was exposed to increasing amounts of air flow for ten minutes. Leucocyte and cytokine levels were measured prior to and after ten minutes of air flow. Cytokine levels were also measured after air exposure when incubated for 24 hours at 37oC. Results: Leucocyte activation, measured by CD11b, was elevated between baseline and air flow rates up to 50 mL/min. After 10 minutes of air exposure, no measured cytokine levels were elevated. After 24 hours of incubation, cytokine levels of TNFα, IL-10, IL-6, and IL-8 were elevated. However, only IL-8 was significantly elevated in citrated blood, but not in heparinized blood, when compared to baseline samples that were also incubated for 24 hours. Conclusion: This study investigates CD11b levels in response to an air stimulus in blood that was anticoagulated with citrate or heparin. Exposure to an air stimulus activates leucocytes. Activation of CD11b was less when using heparin as an anticoagulant compared to citrate. Cytokine activation occurs with air stimulation, but levels do not immediately rise, indicating that time is required to generate free cytokines.
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Affiliation(s)
- Cory J. Toomasian
- Department of Surgery, Extracorporeal Life Support Laboratory, University of Michigan, Ann Arbor, MI, USA
| | - Salvatore R. Aiello
- Department of Surgery, Extracorporeal Life Support Laboratory, University of Michigan, Ann Arbor, MI, USA
| | - Benjamin L. Drumright
- Department of Surgery, Extracorporeal Life Support Laboratory, University of Michigan, Ann Arbor, MI, USA
| | - Terry C. Major
- Department of Surgery, Extracorporeal Life Support Laboratory, University of Michigan, Ann Arbor, MI, USA
| | - Robert H. Bartlett
- Department of Surgery, Extracorporeal Life Support Laboratory, University of Michigan, Ann Arbor, MI, USA
| | - John M. Toomasian
- Department of Surgery, Extracorporeal Life Support Laboratory, University of Michigan, Ann Arbor, MI, USA
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Extracorporeal Circulation During Lung Transplantation Procedures: A Meta-Analysis. ASAIO J 2018; 63:551-561. [PMID: 28257296 DOI: 10.1097/mat.0000000000000549] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Extracorporeal circulation (ECC) is an invaluable tool in lung transplantation (lutx). More than the past years, an increasing number of centers changed their standard for intraoperative ECC from cardiopulmonary bypass (CPB) to extracorporeal membrane oxygenation (ECMO) - with differing results. This meta-analysis reviews the existing evidence. An online literature research on Medline, Embase, and PubMed has been performed. Two persons independently judged the papers using the ACROBAT-NRSI tool of the Cochrane collaboration. Meta-analyses and meta-regressions were used to determine whether veno-arterial ECMO (VA-ECMO) resulted in better outcomes compared with CPB. Six papers - all observational studies without randomization - were included in the analysis. All were considered to have serious bias caused by heparinization as co-intervention. Forest plots showed a beneficial trend of ECMO regarding blood transfusions (packed red blood cells (RBCs) with an average mean difference of -0.46 units [95% CI = -3.72, 2.80], fresh-frozen plasma with an average mean difference of -0.65 units [95% CI = -1.56, 0.25], platelets with an average mean difference of -1.72 units [95% CI = -3.67, 0.23]). Duration of ventilator support with an average mean difference of -2.86 days [95% CI = -11.43, 5.71] and intensive care unit (ICU) length of stay with an average mean difference of -4.79 days [95% CI = -8.17, -1.41] were shorter in ECMO patients. Extracorporeal membrane oxygenation treatment tended to be superior regarding 3 month mortality (odds ratio = 0.46, 95% CI = 0.21-1.02) and 1 year mortality (odds ratio = 0.65, 95% CI = 0.37-1.13). However, only the ICU length of stay reached statistical significance. Meta-regression analyses showed that heterogeneity across studies (sex, year of ECMO implementation, and underlying disease) influenced differences. These data indicate a benefit of the intraoperative use of ECMO as compared with CPB during lung transplant procedures regarding short-term outcome (ICU stay). There was no statistically significant effect regarding blood transfusion needs or long-term outcome. The superiority of ECMO in lutx patients remains to be determined in larger multi-center randomized trials.
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Issitt R, Ball J, Bilkhoo I, Mani A, Walsh B, Voegeli D. Leukocyte filtration of the cardiotomy suction. Does it affect systemic leukocyte activation or pulmonary function? Perfusion 2017; 32:574-582. [DOI: 10.1177/0267659117709922] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background: Cardiopulmonary bypass is thought to propagate a global systemic response through contact with the non-physiological surfaces of the extracorporeal circuit, leading to the stimulation of leukocytes, their adherence to endothelial cells and the release of cytotoxic molecules. This, in turn, has been shown to accelerate pulmonary injury. This study tested a new leukocyte-filtration system (RemoweLL) against a conventional system with no leukocyte-depleting capacity to determine the efficacy of the filtration system and its effects on pulmonary function. Methods: Thirty patients underwent coronary artery bypass graft surgery using either the RemoweLL filtration system (15 patients) or a conventional cardiopulmonary bypass circuit (15 patients). Data were collected on the total number of leukocytes, their differentiation and activation, using the leukocyte adhesion integrin CD11b as a surrogate marker. Pulmonary function was assessed using the Alveolar-arterial Oxygenation Index (AaOI) and patients were categorized using the Berlin definition of acute respiratory distress syndrome (ARDS). Results: Both groups showed significant increases in leukocyte numbers during CPB (p<0.001), with no differences noted between the groups. CD11b showed a significant increase in both groups, with peak activation occurring at the end of CPB, but no difference between the groups (p=0.8). There was a trend towards lower AaOI increases in the filtration group, but this did not reach significance (p=0.075) and there was no difference in ARDS definitions (p=0.33). Conclusions: Leukocyte filtration of cardiotomy suction did not influence total leukocyte counts or activation as measured by CD11b upregulation. Furthermore, no evidence could be found to suggest improved pulmonary function.
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Affiliation(s)
- Richard Issitt
- Perfusion Department, Great Ormond Street Hospital for Children, London, UK
- Faculty of Health Sciences, University of Southampton, Southampton, UK
| | - Jon Ball
- Perfusion Department, University Hospital Southampton, Southampton, UK
| | - Indie Bilkhoo
- Perfusion Department, University Hospital Southampton, Southampton, UK
| | - Adnan Mani
- Flow Cytometry Department, University Hospital Southampton, Southampton, UK
| | - Bronagh Walsh
- Faculty of Health Sciences, University of Southampton, Southampton, UK
| | - David Voegeli
- Faculty of Health Sciences, University of Southampton, Southampton, UK
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10
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Lagny MG, Gothot A, Hans GA, Koch JN, Blaffart F, Hella D, Donneau AF, Roediger L, Lecut C, Pincemaïl J, Cheramy-Bien JP, Defraigne JO. Efficacy of the RemoweLL cardiotomy reservoir for fat and leucocyte removal from shed mediastinal blood: a randomized controlled trial. Perfusion 2016; 31:544-51. [DOI: 10.1177/0267659116649427] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Introduction: Re-transfusion of lipid particles and activated leucocytes with shed mediastinal blood (SMB) can aggravate cardiopulmonary bypass-associated inflammation and increase the embolic load. This study evaluated the fat and leucocyte removal capacity of the RemoweLL cardiotomy reservoir. Methods: Forty-five patients undergoing elective on-pump cardiac surgery were randomly allocated to filtration of SMB using the RemoweLL or the Admiral cardiotomy reservoir. The primary outcome was a drop in leucocytes and lipid particles obtained with the two filters. The effect of the filters on other blood cells and inflammatory mediators, such as myeloperoxidase (MPO), was also assessed. Results: The RemoweLL cardiotomy filter removed 16.5% of the leucocytes (p<0.001) while no significant removal of leucocytes was observed with the Admiral (p=0.48). The percentage reductions in lipid particles were similar in the two groups (26% vs 23%, p=0.2). Both filters similarly affected the level of MPO (p=0.71). Conclusion: The RemoweLL filter more effectively removed leucocytes from SMB than the Admiral. It offered no advantage in terms of lipid particle clearance.
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Affiliation(s)
- Marc-Gilbert Lagny
- Division of Cardio-vascular and Thoracic Surgery, University of Liège Hospital, Liège, Belgium
| | - Andre Gothot
- Haematology Department, University of Liège Hospital, Liège, Belgium
| | - Gregory A. Hans
- Division of Anaesthesiology, University of Liège Hospital, Liege Belgium
| | - Jean-Noël Koch
- Division of Cardio-vascular and Thoracic Surgery, University of Liège Hospital, Liège, Belgium
| | - Francine Blaffart
- Division of Cardio-vascular and Thoracic Surgery, University of Liège Hospital, Liège, Belgium
| | - Dominique Hella
- Division of Cardio-vascular and Thoracic Surgery, University of Liège Hospital, Liège, Belgium
| | | | - Laurence Roediger
- Division of Anaesthesiology, University of Liège Hospital, Liege Belgium
| | - Christelle Lecut
- Haematology Department, University of Liège Hospital, Liège, Belgium
| | - Joël Pincemaïl
- Division of Cardio-vascular and Thoracic Surgery, University of Liège Hospital, Liège, Belgium
| | - Jean-Paul Cheramy-Bien
- Division of Cardio-vascular and Thoracic Surgery, University of Liège Hospital, Liège, Belgium
| | - Jean-Olivier Defraigne
- Division of Cardio-vascular and Thoracic Surgery, University of Liège Hospital, Liège, Belgium
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Hall R. Identification of Inflammatory Mediators and Their Modulation by Strategies for the Management of the Systemic Inflammatory Response During Cardiac Surgery. J Cardiothorac Vasc Anesth 2013; 27:983-1033. [DOI: 10.1053/j.jvca.2012.09.013] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Indexed: 12/21/2022]
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12
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Prieto MA, Guash S, Mendez JC, Munoz C, Planas A, Reyes G. Does use of cell saver decrease the inflammatory response in cardiac surgery? Asian Cardiovasc Thorac Ann 2013; 21:37-42. [PMID: 23430418 DOI: 10.1177/0218492312446838] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND The role of a cell-saver device in the inflammatory response to cardiac surgery has not been well documented. We hypothesized that the use of a cell saver may reduce proinflammatory cytokine concentrations in patients undergoing cardiac surgery. METHODS 57 patients presenting for first-time nonemergency cardiac surgery were prospectively randomized to control or cell salvage groups. Blood samples for inflammatory marker assays were collected from the arterial line on induction of anesthesia, at the end of cardiopulmonary bypass, 1 h after surgery, and 24 h after surgery. Plasma proinflammatory cytokines were analyzed using a sandwich solid-phase enzyme-linked immunosorbent assay. RESULTS The highest cytokine levels were observed 1 h after surgery. When comparing serum interleukin levels in both patient groups during the different perioperative periods, we found a higher interleukin-8 concentration 24 h after the procedure, and higher concentrations of the p40 subunit of interleukin-12 at 1 h and 24 h postoperatively. The concentrations of interleukin-6 and p40 were greater in blood stored by the cardiotomy suction system than in blood processed by the cell saver (p = 0.01 in both cases). The interleukin-8 concentration was higher in the blood processed by the cell saver (p = 0.03). No significant differences were observed in interleukin-1 and interferon gamma levels in blood from both systems. Clinical outcomes were similar in both groups. CONCLUSIONS Our results suggest that cell salvage in low-risk patients undergoing their first elective cardiac procedure does not decrease the inflammatory response after surgery.
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Affiliation(s)
- Maria A Prieto
- Department of Anesthesiology, Hospital Universitario La Princesa, Madrid, Spain
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13
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Kamra C, Beney A. Human albumin in extracorporeal prime: effect on platelet function and bleeding. Perfusion 2013; 28:536-40. [DOI: 10.1177/0267659113492836] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Purpose: Synthetic starches have been positioned as an equivalent substitute for human albumin in extracorporeal prime, with both providing osmotic and oncotic pressure. Another effect of albumin is its ability to coat the synthetic surfaces of an extracorporeal circuit with a biopassivating protein monolayer. Whether this protein biopassivation has any benefit to the patient, assessed by platelet count, platelet function and 24-hour bleeding rate, is considered. Methods: Patients presenting for coronary artery bypass at a Canadian tertiary care hospital were randomized into two groups until a final study size of 20 patients was obtained. The Study Group received 2.5 g of human albumin in the extracorporeal prime and the Control Group remained protein free. Both groups included Voluven 6% as a synthetic starch. Blood samples were obtained at three intervals; Pre-bypass, During bypass (30 minutes after initiation of bypass), and Post-bypass. These samples were assayed for platelet function, platelet count and hemoglobin. Chest tube drainage over a 24-hour period was monitored. Results: Platelet count was significantly higher in the During sample in the Study Group (196 ± 56.5 x 109/ml versus 160 ± 18.5 x 109/ml, p<0.05), however, this difference was no longer significant with the Post-bypass sample (135 ±36.0 x 109/mL versus 127 ±19 x 109/mL). Platelet function assays (PFA) showed no significant differences. Chest tube drainage after 24 hours was significantly lower in the Study Group (586 ± 131.8 ml/24 h versus 741 ± 272.5 ml/24 h, p<0.05). Conclusions: Human albumin can passivate the synthetic surfaces of the extracorporeal circuit, which is supported by observations of preserved platelet count and reduced chest tube drainage. Although some statistically significant benefits were observed, the practical benefits of passivating an extracorporeal circuit with human albumin may be minimal.
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Affiliation(s)
- C Kamra
- Memorial University of Newfoundland, St. John’s, NL, Canada
| | - A Beney
- Eastern Health, St. John’s, NL, Canada
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14
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Abstract
Based on their design, all membrane oxygenators generate a certain resistance to flow. In clinical practice, this resistance is calculated by measuring both blood flow and the pressure drop over the oxygenator. Historically, some designs, such as the Kolobow spiral coil oxygenator and the Cobe flat sheet oxygenator, had quite a high pressure drop, but were, nevertheless, considered very haemocompatible. Today, both medium and low pressure drop oxygenators are commercially available. Based on physics and the existing literature, this review aims to investigate whether pressure drop by itself can be considered an independent factor of haemolysis.
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Affiliation(s)
- F De Somer
- Heart Centre, University Hospital Ghent, Belgium
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15
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Starck CT, Bettex D, Felix C, Reser D, Dreizler T, Hasenclever P, Falk V. Initial results of an optimized perfusion system. Perfusion 2013; 28:292-7. [PMID: 23404056 DOI: 10.1177/0267659113476126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND In order to reduce the negative effects of extracorporeal circulation (ECC), the perfusion system and management were optimized at our institution. The goals of optimization were a reduction in the priming volume, in the foreign surface area and in microbubble activity, as well as optimization of suction blood management. METHODS Sixty patients were included in this retrospective study. Patients were assigned to two groups, with regard to the use of an optimized perfusion system (OPS-group, n=30) and a standard perfusion system (SPS-group, n=30). All patients underwent elective procedures. RESULTS There were no significant differences with respect to patient demographics and operation time. ECC time and cross-clamp time were significantly longer in the OPS group. Statistically significant differences in outcome between the two groups were seen with regard to the following variables: effective priming volume (OPS: 775±447ml; SPS: 1610±0ml; p<0.0001), hemoglobin drop after the start of ECC (OPS: 2.7±1.2g/dl; SPS: 4.2±0.8g/dl; p<0.0001), c-reactive protein on postoperative day 2 (OPS: 121.0±59.4 U/l; SPS: 164.0±50.2 U/l; p=0.003). With regard to the use of blood transfusions, a 33% reduction in the overall amount of transfused units was seen. The rate of patients without transfusions during the entire hospital stay increased from 37% (SPS) to 53% (OPS). The mean transfused red blood cell units per patient was lower in the OPS-group (1.6±2.4 units) than in the SPS-group (2.3±3.5 units). CONCLUSION With the described optimized perfusion system, a significantly lower priming volume, leading to less hemodilution after the onset of CPB, was achieved. The amount of blood transfusions and the inflammatory response were reduced.
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Affiliation(s)
- C T Starck
- Clinic of Cardiac and Vascular Surgery, University Hospital Zurich, 8091 Zurich, Switzerland.
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16
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Sniecinski RM, Chandler WL. Activation of the Hemostatic System During Cardiopulmonary Bypass. Anesth Analg 2011; 113:1319-33. [DOI: 10.1213/ane.0b013e3182354b7e] [Citation(s) in RCA: 149] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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17
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Dell'Amore A, Tripodi A, Cavallucci A, Guerrini F, Ronchi B, Zanoni S, Lamarra M. Efficacy of a New Oxygenator-Integrated Fat and Leukocyte Removal Device. Asian Cardiovasc Thorac Ann 2010; 18:546-50. [DOI: 10.1177/0218492310386516] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We evaluated the effectiveness of a new oxygenator-integrated device for removing lipid particles and leukocytes from shed mediastinal blood in 20 patients undergoing elective cardiac surgery under cardiopulmonary bypass. Another 20 patients undergoing cardiac surgery without the device served as controls. After filtration with the RemoveLL device, lipid particles, leukocytes, and fats were significantly reduced compared to preoperative levels. In the control group, blood fats and lipid particles at the end of cardiopulmonary bypass were significantly increased compared to preoperative levels. Leukocyte counts at the end of bypass were significantly lower in patients who had the filtration device compared to the control group. Platelets counts and hematocrit changes were not significantly different between the 2 groups.
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Affiliation(s)
| | | | - Andrea Cavallucci
- Technical Perfusion Service Villa Maria Cecilia GVM Hospital for Care and Research Cotignola, Italy
| | - Franco Guerrini
- Technical Perfusion Service Villa Maria Cecilia GVM Hospital for Care and Research Cotignola, Italy
| | - Barbara Ronchi
- Technical Perfusion Service Villa Maria Cecilia GVM Hospital for Care and Research Cotignola, Italy
| | - Silvia Zanoni
- Intensive Care Unit Villa Maria Cecilia GVM Hospital for Care and Research Cotignola, Italy
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18
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Abstract
Cardiotomy suction is used for preservation of autologous blood during on-pump cardiac surgery at present. Controversially, the exclusion of cardiotomy suction in some types of operations (coronary artery bypass surgery) is not necessarily associated with an increased transfusion requirement. On the other hand, the use of cardiotomy suction causes an amplification of systemic inflammatory response and a resulting coagulopathy, as well as exacerbation of the microembolic load and hemolysis. This leads to a tendency towards increased blood loss, transfusion requirement and organ dysfunction. On the basis of these facts, it is appropriate to reconsider routine use of cardiotomy suction in on-pump coronary artery surgery.
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Affiliation(s)
- Vladimir Svitek
- Department of Anesthesiology, Resuscitation and Intensive Care of Charles University in Prague, Faculty of Medicine in Hradec Kralove, University Hospital in Hradec Kralove, Czech Republic,
| | - Vladimir Lonsky
- Department of Cardiac Surgery of Palacky University Faculty of Medicine and Dentistry and University Hospital in Olomouc, Czech Republic
| | - Faraz Anjum
- Department of Anesthesiology, Resuscitation and Intensive Care of Charles University in Prague, Faculty of Medicine in Hradec Kralove, University Hospital in Hradec Kralove, Czech Republic
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Cell Saver for On-pump Coronary Operations Reduces Systemic Inflammatory Markers: A Randomized Trial. Ann Thorac Surg 2010; 89:1511-7. [DOI: 10.1016/j.athoracsur.2010.02.003] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2008] [Revised: 01/27/2010] [Accepted: 02/02/2010] [Indexed: 11/19/2022]
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20
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Quimby KR, Greenidge A, Harris A, Landis RC. Phenotypic commitment of monocytes towards a protective hemoglobin scavenging phenotype (CD14posCD163highHLA-DRlow) following cardiopulmonary bypass. CYTOMETRY PART B-CLINICAL CYTOMETRY 2010; 78:357-60. [DOI: 10.1002/cyto.b.20524] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Pohlmann JR, Toomasian JM, Hampton CE, Cook KE, Annich GM, Bartlett RH. The relationships between air exposure, negative pressure, and hemolysis. ASAIO J 2009; 55:469-73. [PMID: 19730004 DOI: 10.1097/mat.0b013e3181b28a5a] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The purpose of this study was to describe the hemolytic effects of both negative pressure and an air-blood interface independently and in combination in an in vitro static blood model. Samples of fresh ovine or human blood (5 ml) were subjected to a bubbling air interface (0-100 ml/min) or negative pressure (0-600 mm Hg) separately, or in combination, for controlled periods of time and analyzed for hemolysis. Neither negative pressure nor an air interface alone increased hemolysis. However, when air and negative pressure were combined, hemolysis increased as a function of negative pressure, the air interface, and time. Moreover, when blood samples were exposed to air before initiating the test, hemolysis was four to five times greater than samples not preexposed to air. When these experiments were repeated using freshly drawn human blood, the same phenomena were observed, but the hemolysis was significantly higher than that observed in sheep blood. In this model, hemolysis is caused by combined air and negative pressure and is unrelated to either factor alone.
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Affiliation(s)
- Joshua R Pohlmann
- Department of Surgery, Division of Critical Care, University of Michigan Medical School, Ann Arbor, Michigan 48109, USA
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22
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Boodhwani M, Nathan HJ, Mesana TG, Rubens FD. Effects of Shed Mediastinal Blood on Cardiovascular and Pulmonary Function: A Randomized, Double-Blind Study. Ann Thorac Surg 2008; 86:1167-73. [DOI: 10.1016/j.athoracsur.2008.06.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2008] [Revised: 05/30/2008] [Accepted: 06/09/2008] [Indexed: 11/26/2022]
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23
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Benk C, Klemm R, Schaller S, Brehm K, Schlensak C, Beyersdorf F. Was der Herzchirurg schon immer über die Herz-Lungen-Maschine wissen wollte. ZEITSCHRIFT FUR HERZ THORAX UND GEFASSCHIRURGIE 2008. [DOI: 10.1007/s00398-008-0644-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Lagan AL, Melley DD, Evans TW, Quinlan GJ. Pathogenesis of the systemic inflammatory syndrome and acute lung injury: role of iron mobilization and decompartmentalization. Am J Physiol Lung Cell Mol Physiol 2008; 294:L161-74. [DOI: 10.1152/ajplung.00169.2007] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Changes in iron homeostatic responses routinely accompany infectious or proinflammatory insults. The systemic inflammatory response syndrome (SIRS) and the development of acute lung injury (ALI) feature pronounced systemic and lung-specific alterations in iron/heme mobilization and decompartmentalization; such responses may be of pathological significance for both the onset and progression of acute inflammation. The potential for excessive iron-catalyzed oxidative stress, altered proinflammatory redox signaling, and provision of iron as a microbial growth factor represent obvious adverse aspects of altered in vivo iron handling. The release of hemoglobin during hemolytic disease or surgical procedures such as those utilizing cardiopulmonary bypass procedures further impacts on iron mobilization, turnover, and storage with associated implications. Genetic predisposition may ultimately determine the extent to which SIRS and related syndromes develop in response to such changes. The design of specific therapeutic interventions based on endogenous stratagems to limit adverse aspects of altered iron handling may prove of therapeutic benefit for the treatment of SIRS and ALI.
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25
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Current World Literature. Curr Opin Anaesthesiol 2008; 21:85-8. [DOI: 10.1097/aco.0b013e3282f5415f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Lau K, Shah H, Kelleher A, Moat N. Coronary artery surgery: cardiotomy suction or cell salvage? J Cardiothorac Surg 2007; 2:46. [PMID: 17961227 PMCID: PMC2173896 DOI: 10.1186/1749-8090-2-46] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2007] [Accepted: 10/25/2007] [Indexed: 11/29/2022] Open
Abstract
Coronary artery bypass grafting (CABG) today results in what may be regarded as acceptable levels of blood loss with many institutions avoiding allogeneic red cell transfusion in over 60% of their patients. The majority of cardiac surgeons employ cardiotomy suction to preserve autologous blood during on-pump coronary artery bypass surgery; however the use of cardiotomy suction is associated with a more pronounced systemic inflammatory response and a resulting coagulopathy as well as exacerbating the microembolic load. This leads to a tendency to increased blood loss, transfusion requirement and organ dysfunction. Conversely, the avoidance of cardiotomy suction in coronary artery bypass surgery is not associated with an increased transfusion requirement. There is therefore no indication for the routine use of cardiotomy suction in on-pump coronary artery surgery.
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Affiliation(s)
- Kelvin Lau
- Department of Cardiac Surgery, Royal Brompton Hospital, and NHLI at Imperial College, London SW3 6NP, UK.
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