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Coleman JR, Moore EE, Kelher MR, Jones K, Cohen MJ, Banerjee A, Silliman CC. Elucidating the molecular mechanisms of fibrinolytic shutdown after severe injury: The role of thrombin-activatable fibrinolysis inhibitor. J Trauma Acute Care Surg 2023; 94:857-862. [PMID: 36787438 PMCID: PMC10205661 DOI: 10.1097/ta.0000000000003911] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
BACKGROUND The mechanisms underlying trauma-induced coagulopathy remain elusive. Hyperfibrinolysis has been linked to increased plasminogen activation and antiprotease consumption; however, the mechanistic players in its counterpart, fibrinolysis shutdown, remain unclear. We hypothesize that thrombin-activatable fibrinolysis inhibitor (TAFI) plays a major role in fibrinolytic shutdown after injury. METHODS As part of this observational cohort study, whole blood was collected from trauma activation patients at a single, level 1 trauma center. Citrated rapid thrombelastography and the following enzyme-linked immunosorbent assays were conducted: thrombin, antithrombin, thrombin-antithrombin complex, TAFI, plasminogen, antiplasmin, plasmin-antiplasmin (PAP), tissue plasminogen activator, plasminogen activator inhibitor 1, and tissue plasminogen activator-plasminogen activator inhibitor 1 complex. Univariate and cluster analysis were performed. RESULTS Overall, 56 patients (median age, 33.5 years; 70% male) were included. The majority (57%) presented after blunt mechanism and with severe injury (median New Injury Severity Score, 27). Two clusters of patients were identified: Group 1 (normal fibrinolysis, n = 21) and Group 2 (fibrinolysis shutdown, n = 35). Group 2 had significantly lower fibrinolysis with a median LY30 of 1.1% (interquartile range [IQR], 0.1-1.9%) versus 2.1% (IQR, 0.5-2.8%) in Group 1; while the median LY30 was within physiologic range, 45% of patients in Group 2 were in shutdown (vs. 24% in Group 1, p = 0.09). Compared with Group 1, Group 2 had significantly higher PAP (median, 4.7 [IQR, 1.7-9.3] vs. 1.4 [1.0-2.1] μg/mL in Group 1; p = 0.002) and higher TAFI (median, 152.5% [IQR, 110.3-190.7%] vs. 121.9% [IQR, 93.2-155.6%]; p = 0.04). There was a strong correlation between PAP and TAFI ( R2 = 0.5, p = 0.0002). CONCLUSION The presented data characterize fibrinolytic shutdown, indicating an initial plasmin burst followed by diminished fibrinolysis, which is distinct from hypofibrinolysis (inadequate plasmin burst and fibrinolysis). After an initial thrombin and plasmin burst (increased PAP), fibrinolysis is inhibited, mediated in part by increased TAFI.
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Affiliation(s)
- Julia R Coleman
- From the Department of Surgery (J.R.C., E.E.M., M.J.C., A.B., C.C.S.), University of Colorado-Denver, Aurora; Department of Surgery (E.E.M.), Ernest E Moore Shock Trauma Center at Denver Health; Department of Cell Biology (K.J.), University of Oklahoma; Vitalant Research Institute (M.R.K.); and Department of Pediatrics (C.C.S.), School of Medicine, University of Colorado Denver, Aurora, Colorado
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Budnik I, Shenkman B, Morozova O, Einav Y. Thromboelastometry assessment of the effects of fibrinogen, activated prothrombin complex concentrate, and tranexamic acid on clot formation and fibrinolysis in a model of trauma-induced coagulopathy. Eur J Trauma Emerg Surg 2020; 47:1057-1063. [PMID: 31894349 DOI: 10.1007/s00068-019-01283-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 12/03/2019] [Indexed: 11/28/2022]
Abstract
PURPOSE Coagulation abnormalities are common following major trauma. The aim of this study was to assess the improvement of trauma-induced coagulopathy (TIC) in an in vitro model. METHODS TIC was created on blood taken from healthy individuals by inducing hemodilution, acidosis, hypothermia and fibrinolysis. Next, blood samples were subjected to rotational thromboelastometry to assess the effect of hemostasis modulators on blood coagulation and fibrinolysis. RESULTS Introducing to blood fibrinogen at 0.75 mg/mL, prothrombin complex concentrate at 0.66 IU/mL or tranexamic acid at 95 µg/mL increased clot strength. Higher effect was observed by combination of fibrinogen with tranexamic acid and prothrombin complex with tranexamic acid, whereas the maximal effect was achieved using all agents together. Fibrinolysis was inhibited by tranexamic acid and stronger by triple combination of the agents. Selective treating the TIC blood with fibrinogen, prothrombin complex or tranexamic acid at two time lower concentrations did not affect clot strength. Combining fibrinogen with prothrombin complex or with tranexamic acid stimulated clot strength but at lower extent compared to higher concentrations. Lysis onset time was prolonged by tranexamic acid. Maximal effect on both clot formation and fibrinolysis was achieved using all three agents together. CONCLUSIONS Blood clotting stimulation and fibrinolysis inhibition in the TIC model was enough combining subthreshold concentrations of fibrinogen, prothrombin complex and tranexamic acid. Further experiments are warranted in both in vitro and in vivo conditions with minimally effective concentrations of both pro-coagulant and anti-fibrinolytic drugs assuming that this combinatorial approach may not only improve coagulopathy but also minimize the risk of thrombotic complications.
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Affiliation(s)
- Ivan Budnik
- Department of Pathophysiology, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
| | - Boris Shenkman
- National Hemophilia Center, Sheba Medical Center, Tel Hashomer, Israel
| | - Olga Morozova
- Department of Pathophysiology, Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia
| | - Yulia Einav
- Faculty of Engineering, Holon Institute of Technology, Holon, Israel.
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High-dose Factor XIII administration induces effective hemostasis for trauma-associated coagulopathy (TAC) both in vitro and in rat hemorrhagic shock in vivo models. J Trauma Acute Care Surg 2019; 85:588-597. [PMID: 29851904 DOI: 10.1097/ta.0000000000001998] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND Trauma-associated coagulopathy (TAC) is an early and primary complication in severe trauma patients. Factor XIII (FXIII) is reported to stabilize a clot in the late phase of the coagulation cascade. The goal of this study was to investigate whether the administration of FXIII improves the condition of TAC both in vitro and in vivo. METHODS We evaluated the effects of different doses, including a very high dose of FXIII (3.6-32.4 IU/mL) on tissue-plasminogen activator-induced hyperfibrinolysis and the combined condition of dilutional coagulopathy and tissue-plasminogen activator-induced hyperfibrinolysis in vitro. The coagulation status was analyzed by rotational thromboelastometry (ROTEM) and Sonoclot. Then, we evaluated the effect of high-dose FXIII (300 IU/kg) for severe coagulopathy in vivo using a rat liver trauma model in which coagulopathy similar to TAC was observed. Survival time and the amount of intra-abdominal bleeding of rats were measured, and a coagulation test was also performed. Histologic evaluations of rats' lung and kidney after FXIII administration were completed. RESULTS High-dose FXIII significantly improved clot strength as well as increased resistance to hyperfibrinolysis in vitro which was confirmed by ROTEM. Platelet function on Sonoclot was significantly increased by FXIII in a dose-dependent manner. Factor XIII significantly decreased the total amount of bleeding and prolonged the survival time compared to control (control vs FXIII: 108.9 ± 11.4 vs 32.6 ± 5.5 mL/kg; p < 0.001; 26.0 ± 8.8 vs 120 minutes, p < 0.001) in a rat model. Rotational thromboelastometry parameters and platelet function on Sonoclot were significantly improved in the FXIII (+) group compared to control. No adverse effects of FXIII were detected histologically. CONCLUSION Factor XIII not only generated stable clot resistance to hyperfibrinolysis but also enhanced platelet function by facilitating clot retraction. High-dose FXIII administration therapy has significant clinical impact for severe trauma accompanied with TAC. STUDY TYPE Human in vitro and rat in vivo experimental study.
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Budnik I, Shenkman B, Morozova O, Andreichyn J, Einav Y. Correction of coagulopathy in thrombocytopenia and Glanzmann thrombasthenia models by fibrinogen and factor XIII as assessed by thromboelastometry. ACTA ACUST UNITED AC 2018; 25:347-351. [PMID: 29805054 DOI: 10.1016/j.pathophys.2018.05.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 05/07/2018] [Accepted: 05/22/2018] [Indexed: 11/24/2022]
Abstract
Thrombocytopenia (TCP) and Glanzmann thrombasthenia (GT) are typical platelet disorders characterized by mild to severe bleeding. This study aims to create in vitro models of TCP and GT and to correct the impaired clot formation by fibrinogen and coagulation factor XIII. The TCP model (mean platelet count, 16 × 109 L-1) was produced by differential centrifugation of normal blood followed by mixing plasma with packed cells. The GT model was created by treating normal blood with 50 μg/mL eptifibatide, an inhibitor of platelet integrin αIIbβ3. Clot formation was evaluated in whole blood by rotation thromboelastometry. In both models, the extent of clot strength was two-three times lower compared to normal blood. Fibrinogen and, to a lesser extent, factor XIII stimulated the propagation phase of clot formation both in TCP and GT models. Clot strength in TCP was increased by both agents, while in GT by fibrinogen only. Similar results were obtained in blood from patients with primary immune thrombocytopenia and Glanzmann thrombasthenia. In conclusion, the created models may be useful in the development of new ways to correct the impaired coagulation potential in TCP and GT.
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Affiliation(s)
- Ivan Budnik
- Sechenov First Moscow State Medical University, Moscow, Russia.
| | | | - Olga Morozova
- Sechenov First Moscow State Medical University, Moscow, Russia
| | - Jurii Andreichyn
- Ivan Horbachevsky Ternopil State Medical University, Ternopil, Ukraine
| | - Yulia Einav
- Holon Institute of Technology, Holon, Israel
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Shams Hakimi C, Carling MS, Hansson EC, Brisby H, Hesse C, Radulovic V, Jeppsson A. The Effect of Ex Vivo Factor XIII Supplementation on Clot Formation in Blood Samples From Cardiac and Scoliosis Surgery Patients. Clin Appl Thromb Hemost 2017. [PMID: 28651441 DOI: 10.1177/1076029617713872] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Excessive perioperative bleeding remains a substantial problem. Factor XIII (FXIII) contributes to clot stability, and it has therefore been suggested that supplementation with FXIII concentrate may improve perioperative hemostasis. We evaluated the effects of increasing doses of FXIII, alone or in combination with fibrinogen or platelet concentrate, in blood samples from 2 considerably different groups of surgical patients: cardiac and scoliosis surgery patients. Whole-blood samples were collected immediately after operation from cardiac and scoliosis surgery patients. The samples were supplemented with 3 clinically relevant doses of FXIII concentrate (+20%, +40%, and +60%), alone or in combination with a fixed dose of fibrinogen concentrate (+1.0 g/L) or fresh apheresis platelets (+92 × 109/L). Clot formation was assessed with rotational thromboelastometry (ROTEM). When the highest dose of FXIII concentrate was added, EXTEM clotting time was shortened by 10% in both cardiac and scoliosis surgery patients (95% confidence intervals: 2.4%-17% and 3.3%-17%, respectively), and FIBTEM maximum clot firmness was increased by 25% (9.3%-41%) in cardiac patients, relative to baseline. When fibrinogen was added, the dose-dependent effect of FXIII on clot stability was maintained, but the total effect was markedly greater than with FXIII alone, +150% (100%-200%) and +160% (130%-200%) for the highest FXIII dose in cardiac and scoliosis patients, respectively. Ex vivo supplementation with clinically relevant doses of FXIII improved clot formation moderately in blood samples from cardiac and scoliosis surgery patients, both alone and when given in combination with fibrinogen or platelet concentrate.
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Affiliation(s)
- Caroline Shams Hakimi
- 1 Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Malin S Carling
- 2 Department of Orthopedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Emma C Hansson
- 1 Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Helena Brisby
- 2 Department of Orthopedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Camilla Hesse
- 3 Department of Clinical Chemistry and Transfusion Medicine, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Vladimir Radulovic
- 4 Department of Medicine/Hematology and Coagulation Disorders, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Anders Jeppsson
- 1 Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Schmidt DE, Halmin M, Wikman A, Östlund A, Ågren A. Relative effects of plasma, fibrinogen concentrate, and factor XIII on ROTEM coagulation profiles in an in vitro model of massive transfusion in trauma. Scandinavian Journal of Clinical and Laboratory Investigation 2017. [PMID: 28632435 DOI: 10.1080/00365513.2017.1334128] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Massive traumatic haemorrhage is aggravated through the development of trauma-induced coagulopathy, which is managed by plasma transfusion and/or fibrinogen concentrate administration. It is yet unclear whether these treatments are equally potent in ensuring adequate haemostasis, and whether additional factor XIII (FXIII) administration provides further benefits. In this study, we compared ROTEM whole blood coagulation profiles after experimental massive transfusion with different transfusion regimens in an in vitro model of dilution- and transfusion-related coagulopathy. Healthy donor blood was mixed 1 + 1 with six different transfusion regimens. Each regimen contained RBC, platelet concentrate, and either fresh frozen plasma (FFP) or Ringer's acetate (RA). The regimens were further augmented through addition of a low- or medium-dose fibrinogen concentrate and FXIII. Transfusion with FFP alone was insufficient to maintain tissue-factor activated clot strength, coincidental with a deficiency in fibrin-based clot strength. Fibrinogen concentrate conserved, but did not improve coagulation kinetics and overall clot strength. Only combination therapy with FFP and low-dose fibrinogen concentrate improved both coagulation kinetics and fibrin-based clot strength. Administration of FXIII did not result in an improvement of clot strength. In conclusion, combination therapy with both FFP and low-dose fibrinogen concentrate improved clotting time and produced firm clots, representing a possible preferred first-line regimen to manage trauma-induced coagulopathy when RBC and platelets are also transfused. Further research is required to identify optimal first-line transfusion fluids for massive traumatic haemorrhage.
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Affiliation(s)
- David E Schmidt
- a Department of Medicine, Division of Haematology, Coagulation Unit , Karolinska University Hospital and Karolinska Institutet , Stockholm , Sweden
| | - Märit Halmin
- b Department of Medical Epidemiology and Biostatistics , Karolinska Institutet , Stockholm , Sweden.,c Department of Anesthesiology and Intensive Care , Danderyd Hospital , Stockholm , Sweden
| | - Agneta Wikman
- d Department of Clinical Immunology and Transfusion Medicine , Karolinska University Hospital and Karolinska Institutet , Stockholm , Sweden
| | - Anders Östlund
- e Department of Anaesthesiology and Intensive Care , Karolinska University Hospital and Karolinska Institutet , Stockholm , Sweden
| | - Anna Ågren
- a Department of Medicine, Division of Haematology, Coagulation Unit , Karolinska University Hospital and Karolinska Institutet , Stockholm , Sweden
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Model of trauma-induced coagulopathy including hemodilution, fibrinolysis, acidosis, and hypothermia. J Trauma Acute Care Surg 2017; 82:287-292. [DOI: 10.1097/ta.0000000000001282] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Shenkman B, Einav Y, Livnat T, Budnik I, Martinowitz U. Rotation thromboelastometry analysis of clot formation and fibrinolysis in severe thrombocytopenia: effect of fibrinogen, activated prothrombin complex concentrate, and thrombin- activatable fibrinolysis inhibitor. Int J Lab Hematol 2015; 37:521-9. [DOI: 10.1111/ijlh.12331] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Accepted: 01/07/2015] [Indexed: 12/16/2022]
Affiliation(s)
- B. Shenkman
- National Hemophilia Center; Sheba Medical Center; Tel-Hashomer Israel
| | - Y. Einav
- Faculty of Sciences; Holon Institute of Technology; Holon Israel
| | - T. Livnat
- National Hemophilia Center; Sheba Medical Center; Tel-Hashomer Israel
| | - I. Budnik
- Department of Pathophysiology; I. M. Sechenov First Moscow State Medical University; Moscow Russia
| | - U. Martinowitz
- National Hemophilia Center; Sheba Medical Center; Tel-Hashomer Israel
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Ramaiola I, Padró T, Peña E, Juan-Babot O, Cubedo J, Martin-Yuste V, Sabate M, Badimon L. Changes in thrombus composition and profilin-1 release in acute myocardial infarction. Eur Heart J 2014; 36:965-75. [PMID: 25217443 DOI: 10.1093/eurheartj/ehu356] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 08/08/2014] [Indexed: 12/11/2022] Open
Abstract
AIM Thrombus formation is a dynamic process regulated by flow, blood cells, and plasma proteins. The present study was performed to investigate the characteristics of human coronary thrombus in ST-segment elevation myocardial infarction (STEMI). METHODS AND RESULTS Patients admitted with ST-elevation myocardial infarction, in which thrombectomy was performed, were included (n = 86). Intracoronary thrombi and blood from the culprit coronary site and the systemic circulation were obtained during percutaneous coronary intervention (PCI). Thrombi were categorized by onset-of-pain-to-PCI elapsed time in thrombus of <3 (T3) and more than 6 h of evolution (T6). Clinical, morphological, and proteomic variables were investigated. While T3 were mainly composed by platelets and fibrin(ogen), T6 were characterized by a reduced platelet content, increased leucocytes infiltration (including monocytes, neutrophils, T-cells, and B-cells), and appearance of undifferentiated progenitor cells. Significant differences between T3 and T6 were found in the cell cytoskeleton-associated proteome (beta-actin and tropomyosin 3 and 4). By discovery proteomics, we have identified profilin-1 (Pfn-1) in the coronary thrombi and detected higher levels in T3 than in T6. While plasma Pfn-1 levels were low in T3 patients, levels significantly increased in both coronary and peripheral circulation in T6 patients indicating release. In vitro platelet aggregation studies showed that platelets secrete Pfn-1 upon complete activation. CONCLUSION Coronary thrombi show rapid dynamic changes both in structure and cell composition as a function of elapsed onset-of-pain-to-PCI time. Aged ischaemic thrombi were more likely to have reduced Pfn-1 content releasing Pfn-1 to the circulation. Onset-of-pain-to-PCI elapsed time in STEMI patients and hence age of occlusive thrombus can be profiled by Pfn-1 levels found in the peripheral circulation.
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Affiliation(s)
- Ilaria Ramaiola
- Cardiovascular Research Center (CSIC-ICCC), IIB SantPau, c/Sant Antoni Mª Claret 167, 08025 Barcelona, Spain
| | - Teresa Padró
- Cardiovascular Research Center (CSIC-ICCC), IIB SantPau, c/Sant Antoni Mª Claret 167, 08025 Barcelona, Spain
| | - Esther Peña
- Cardiovascular Research Center (CSIC-ICCC), IIB SantPau, c/Sant Antoni Mª Claret 167, 08025 Barcelona, Spain
| | - Oriol Juan-Babot
- Cardiovascular Research Center (CSIC-ICCC), IIB SantPau, c/Sant Antoni Mª Claret 167, 08025 Barcelona, Spain
| | - Judit Cubedo
- Cardiovascular Research Center (CSIC-ICCC), IIB SantPau, c/Sant Antoni Mª Claret 167, 08025 Barcelona, Spain
| | | | | | - Lina Badimon
- Cardiovascular Research Center (CSIC-ICCC), IIB SantPau, c/Sant Antoni Mª Claret 167, 08025 Barcelona, Spain Cardiovascular Research Chair UAB, Barcelona, Spain
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Clot stability and fibrin deposition is strongly reduced in mice in which mouse TAFI is replaced by human TAFI. Thromb Res 2014; 133:1166-8. [DOI: 10.1016/j.thromres.2014.03.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Revised: 03/26/2014] [Accepted: 03/27/2014] [Indexed: 11/17/2022]
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In vitro evaluation of clot quality and stability in a model of severe thrombocytopenia: effect of fibrinogen, factor XIII and thrombin-activatable fibrinolysis inhibitor. BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2013; 12:78-84. [PMID: 24333083 DOI: 10.2450/2013.0068-13] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Accepted: 09/04/2013] [Indexed: 11/21/2022]
Abstract
BACKGROUND The treatment options in severe thrombocytopenia (platelet count ≤20×10(9)/L) are limited. The aim of this study was to investigate ways of improving blood clotting and stability in reconstituted thrombocytopenia. MATERIALS AND METHODS Thrombocytopenia (platelets [16±4]×10(9)/L) was created by differential centrifugation of normal blood followed by reconstitution of whole blood which was subjected to clotting in a rotation thromboelastometer by CaCl2 and tissue factor, and to fibrinolysis by tissue plasminogen activator (tPA). In separate experiments, blood was diluted by 40% with TRIS/saline solution. Blood was treated with fibrinogen (fib), factor XIII (FXIII), and thrombin-activatable fibrinolysis inhibitor (TAFI). RESULTS The maximum clot firmness of thrombocytopenic blood was approximately 2-fold less than that of intact blood. Supplementation of blood with fib and FXIII improved clot formation. In the presence of tPA, among fib, FXIII and TAFI, only fib stimulated clot propagation whereas each of these agents increased clot strength. There was a synergistic effect when fib was added together with FXIII or TAFI. Fibrinolysis was inhibited by TAFI and to a greater extent by TAFI + FXIII. Fourty percent dilution of blood reduced clot strength and increased susceptibility to tPA. Clot strength was increased by the treatments in the following order: fib/FXIII/TAFI > fib/TAFI > fib > TAFI > FXIII. In the presence of tPA, TAFI and FXIII lysed the clots significantly more slowly. This effect was stronger when blood was treated with the combination of fib/FXIII/TAFI. Doubling the fib concentration, alone or together with other agents, did not improve clot strength or stability. DISCUSSION Augmentation of clot formation and anti-fibrinolysis by combining fib, FXIII and TAFI may be beneficial for the treatment of patients with severe thrombocytopenia especially when complicated by haemodilution following introduction of fluids to compensate for massive blood loss.
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Hanna J, Winstedt D, Schött U. Fibrinogen and FXIII dose response effects on albumin-induced coagulopathy. Scandinavian Journal of Clinical and Laboratory Investigation 2013; 73:553-62. [DOI: 10.3109/00365513.2013.821710] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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High haematocrit in cyanotic congenital heart disease affects how fibrinogen activity is determined by rotational thromboelastometry. Thromb Res 2013; 132:e145-51. [DOI: 10.1016/j.thromres.2013.07.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Revised: 06/18/2013] [Accepted: 07/09/2013] [Indexed: 01/08/2023]
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Effect of haematocrit on fibrin-based clot firmness in the FIBTEM test. BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2012; 11:412-8. [PMID: 23245708 DOI: 10.2450/2012.0043-12] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Accepted: 06/14/2012] [Indexed: 11/21/2022]
Abstract
BACKGROUND Point-of-care thromboelastometry (ROTEM(®)) can be used to assess coagulation in whole blood. In the ROTEM(®) FIBTEM test, cytochalasin D eliminates the contribution of platelets to the whole blood clot; hence, only the remaining elements, including fibrinogen/fibrin, red blood cells and factor XIII, contribute to clot strength. We investigated the relationships between FIBTEM maximum clot firmness (MCF), whole blood fibrinogen concentration and plasma fibrinogen concentration to determine the impact of haematocrit on these parameters during cardiac surgery. MATERIALS AND METHODS The relationships between FIBTEM MCF and both whole blood fibrinogen concentration and plasma fibrinogen concentration (Clauss assay) were evaluated pre-operatively and after cardiopulmonary bypass/protamine administration in haematocrit-based subgroups. RESULTS The study included 157 patients. The correlation coefficient rho between FIBTEM MCF and plasma fibrinogen concentration was 0.68 at baseline and 0.70 after protamine, while that between FIBTEM MCF and whole blood fibrinogen concentration was 0.74 at baseline and 0.72 after protamine (all P <0.001). In subgroup analyses based on haematocrit levels, pre-operative FIBTEM MCF and whole blood fibrinogen concentration were both significantly higher (P <0.05) for the lowest haematocrit subgroup, but plasma fibrinogen concentration was similar in all groups. After protamine, no significant differences were observed between the lowest haematocrit group and the other groups for any of the three parameters. CONCLUSIONS The effect of haematocrit on blood clotting is not reflected by plasma fibrinogen concentration, in contrast to FIBTEM MCF which incorporates the contribution of haematocrit to whole blood clot firmness. This effect does, however, appear to be negligible in haemodiluted patients.
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