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Cortesi V, Cavallaro G, Raffaeli G, Ghirardello S, Mosca F, Klei TR, Fustolo-Gunnink S, Stanworth S, New HV, Deschmann E, Lopriore E. Why might cord blood be a better source of platelets for transfusion to neonates? BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2024; 22:292-302. [PMID: 38557319 PMCID: PMC11251836 DOI: 10.2450/bloodtransfus.566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 09/04/2023] [Indexed: 04/04/2024]
Abstract
Thrombocytopenia (defined as a platelet count <150×109/L) is a common condition in preterm neonates and may occur in 18-35% of all infants admitted to the Neonatal Intensive Care Unit (NICU). Neonatal platelet functionality in terms of reactivity is often described as reduced compared to adults, even in healthy, term neonates. However, this platelet "hyporeactivity" does not correspond to a global functional impairment of the normal delicately balanced neonatal hemostatic system. The extent to which neonatal thrombocytopenia and platelet hyporeactivity contribute to the bleeding risk in preterm neonates remains unknown. Prophylactic platelet transfusions are often administered to them to reduce the risk of bleeding. However, recent literature indicates that adopting a higher platelet transfusion threshold than a lower one results in significantly higher death rates or major bleeding and can be harmful. Although the mechanism by which this occurs is not entirely clear, a mismatch between adult transfused platelets and the neonatal hemostatic system, as well as volume overload, are speculated to be potentially involved. Therefore, future research should consider novel transfusion products that may be more suitable for premature neonates. Blood products derived from umbilical cord blood (UCB) are promising, as they might perfectly match neonatal blood features. Here, we discuss the current knowledge about UCB-derived products, focusing on UCB-derived platelet concentrates and their potential for future clinical application. We will discuss how they may overcome the potential risks of transfusing adult-derived platelets to premature infants while maintaining efficacy.
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Affiliation(s)
- Valeria Cortesi
- Neonatal Intensive Care Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
- Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy
| | - Giacomo Cavallaro
- Neonatal Intensive Care Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Genny Raffaeli
- Neonatal Intensive Care Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
- Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy
| | - Stefano Ghirardello
- Neonatal Intensive Care Unit, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Fabio Mosca
- Neonatal Intensive Care Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
- Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy
| | - Thomas R.L. Klei
- Department of Product and Process Development, Sanquin Blood Supply, Amsterdam, the Netherlands
| | - Suzanne Fustolo-Gunnink
- Sanquin Blood Supply Foundation, Amsterdam, the Netherlands
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, the Netherlands
- Department of Pediatric Hematology, Emma Children’s Hospital, Amsterdam University Medical Center (UMC), University of Amsterdam, Amsterdam, the Netherlands
| | - Simon Stanworth
- Department of Hematology, Oxford University Hospitals, NHS Foundation Trust, Oxford, United Kingdom
| | - Helen V. New
- Clinical Directorate, NHS Blood and Transplant, London, United Kingdom
| | - Emöke Deschmann
- Department of Neonatology, Karolinska University Hospital and Karolinska Institute, Stockholm, Sweden
| | - Enrico Lopriore
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, the Netherlands
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Garcia Guerra A, Ryerson L, Garros D, Nahirniak S, Granoski D, Calisin O, Sheppard C, Lequier L, Garcia Guerra G. Standard Versus Restrictive Transfusion Strategy for Pediatric Cardiac ECLS Patients: Single Center Retrospective Cohort Study. ASAIO J 2023; 69:681-686. [PMID: 37084290 DOI: 10.1097/mat.0000000000001917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/23/2023] Open
Abstract
This retrospective cohort study aimed to compare blood component transfusion before and after the implementation of a restrictive transfusion strategy (RTS) in pediatric cardiac Extracorporeal Life Support (ECLS) patients. The study included children admitted to the pediatric cardiac intensive care unit (PCICU) at the Stollery Children's Hospital who received ECLS between 2012 and 2020. Children on ECLS between 2012 and 2016 were treated with standard transfusion strategy (STS), while those on ECLS between 2016 and 2020 were treated with RTS. During the study, 203 children received ECLS. Daily median (interquartile range [IQR]) packed red blood cell (PRBC) transfusion volume was significantly lower in the RTS group; 26.0 (14.4-41.5) vs. 41.5 (26.6-64.4) ml/kg/day, p value <0.001. The implementation of a RTS led to a median reduction of PRBC transfusion of 14.5 (95% CI: 6.70-21.0) ml/kg/day. Similarly, the RTS group received less platelets: median (IQR) 8.4 (4.50-15.0) vs. 17.5 (9.40-29.0) ml/kg/day, p value <0.001. The implementation of a RTS resulted in a median reduction of platelet transfusion of 9.2 (95% CI: 5.45-13.1) ml/kg/day. The RTS resulted in less median (IQR) fluid accumulation in the first 48 hours: 56.7 (2.30-121.0) vs. 140.4 (33.8-346.2) ml/kg, p value = 0.001. There were no significant differences in mechanical ventilation days, PCICU/hospital days, or survival. The use of RTS resulted in lower blood transfusion volumes, with similar clinical outcomes.
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Affiliation(s)
| | - Lindsay Ryerson
- Stollery Children's Hospital, Edmonton, Alberta, Canada
- Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada
| | - Daniel Garros
- Stollery Children's Hospital, Edmonton, Alberta, Canada
- Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada
| | - Susan Nahirniak
- Department of Pediatrics, University of Calgary, Alberta Children's Hospital, Calgary, Alberta, Canada
| | - Don Granoski
- Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada
| | - Olivia Calisin
- Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada
| | - Cathy Sheppard
- Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada
| | - Laurance Lequier
- Stollery Children's Hospital, Edmonton, Alberta, Canada
- Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada
| | - Gonzalo Garcia Guerra
- Department of Pediatrics, University of Calgary, Alberta Children's Hospital, Calgary, Alberta, Canada
- Department of Pediatrics, University of Calgary, Calgary, Alberta, Canada
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Llancalahuen FM, Vallejos A, Aravena D, Prado Y, Gatica S, Otero C, Simon F. α1-Adrenergic Stimulation Increases Platelet Adhesion to Endothelial Cells Mediated by TRPC6. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1408:65-82. [PMID: 37093422 DOI: 10.1007/978-3-031-26163-3_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/25/2023]
Abstract
Stimulation of a1-adrenergic nervous system is increased during systemic inflammation and other pathological conditions with the consequent adrenergic receptors (ARs) activation. It has been reported that a1-stimulation contributes to coagulation since a1-AR blockers inhibit coagulation and its organic consequences. Also, coagulation induced by a1-AR stimulation can be greatly decreased using a1-AR blockers. In health, endothelial cells (ECs) perform anticoagulant actions at cellular and molecular level. However, during inflammation, ECs turn dysfunctional promoting a procoagulant state. Endothelium-dependent coagulation progresses at cellular and molecular levels, promoting endothelial acquisition of procoagulant properties to potentiate coagulation by means of prothrombotic and antifibrinolytic proteins expression increase in ECs releasing them to circulation, the thrombus formation is strengthened. Calcium signaling is a main feature of coagulation. Inhibition of ion channels involved in Ca2+ entry severely decreases coagulation. The transient receptor potential canonical 6 (TRPC6) is a non-selective Ca2+-permeable ion channel. TRPC6 activity is induced by diacylglycerol, suggesting that is regulated by a1-ARs. Furthermore, a1-ARs stimulation elicits a TRPC-like current in rat mesenteric artery smooth muscle and mesangial cells. However, whether TRPC6 could promote an ECs-mediated platelet adhesion induced by a1-adrenergic stimulation is currently not known. Therefore, the aim of this study was to examine if the TRPC6 calcium channel mediates platelet adhesion induced by a1-adrenergic stimulation. Our results suggest that platelet adhesion to ECs is enhanced by the a1-adrenergic stimulation evoked by phenylephrine mediated by TRPC6 activity. We conclude that TRPC6 is a molecular determinant in platelet adhesion to ECs with implications in systemic inflammatory diseases treatment.
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Affiliation(s)
- Felipe M Llancalahuen
- Faculty of Life Sciences, Universidad Andres Bello, Santiago, Chile
- Millennium Institute on Immunology and Immunotherapy, Santiago, Chile
| | - Alejando Vallejos
- Faculty of Life Sciences, Universidad Andres Bello, Santiago, Chile
- Millennium Institute on Immunology and Immunotherapy, Santiago, Chile
| | - Diego Aravena
- Faculty of Life Sciences, Universidad Andres Bello, Santiago, Chile
- Millennium Institute on Immunology and Immunotherapy, Santiago, Chile
| | - Yolanda Prado
- Faculty of Life Sciences, Universidad Andres Bello, Santiago, Chile
- Millennium Institute on Immunology and Immunotherapy, Santiago, Chile
| | - Sebastian Gatica
- Faculty of Life Sciences, Universidad Andres Bello, Santiago, Chile
- Millennium Institute on Immunology and Immunotherapy, Santiago, Chile
| | - Carolina Otero
- Escuela de Química y Farmacia, Facultad de Medicina, Universidad Andres Bello, Santiago, Chile
| | - Felipe Simon
- Faculty of Life Sciences, Universidad Andres Bello, Santiago, Chile.
- Millennium Institute on Immunology and Immunotherapy, Santiago, Chile.
- Millennium Nucleus of Ion Channel-Associated Diseases, Santiago, Chile.
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Davenport P, Sola‐Visner M. Platelets in the neonate: Not just a small adult. Res Pract Thromb Haemost 2022; 6:e12719. [PMID: 35592812 PMCID: PMC9102610 DOI: 10.1002/rth2.12719] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 03/08/2022] [Accepted: 03/31/2022] [Indexed: 12/25/2022] Open
Abstract
Neonates, particularly those born preterm, have a high incidence of thrombocytopenia and bleeding, most commonly in the brain. Because of this, it has historically been accepted that neonates should be transfused at higher platelet counts than older children or adults, to decrease their bleeding risk. However, a number of observational studies and a recent large, randomized trial found a higher incidence of bleeding and mortality in neonates who received more platelet transfusions. The mechanisms underlying the deleterious effects of platelet transfusions in neonates are unknown, but it has been hypothesized that transfusing adult platelets into the very different physiological environment of a neonate may result in a “developmental mismatch” with potential negative consequences. Specifically, neonatal platelets are hyporeactive in response to multiple agonists and upon activation express less surface P‐selectin than adult platelets. However, this hyporeactivity is well balanced by factors in neonatal blood that promote clotting, such as the elevated hematocrit, elevated von Willebrand factor (VWF) levels, and a predominance of ultra‐long VWF polymers, with the net result of normal neonatal primary hemostasis. So far, most studies on the developmental differences between neonatal and adult platelets have focused on their hemostatic functions. However, it is now clear that platelets have important nonhemostatic functions, particularly in angiogenesis, immune responses, and inflammation. Whether equally important developmental differences exist with regard to those nonhemostatic platelet functions and how platelet transfusions perturb those processes in neonates remain unanswered questions.
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Affiliation(s)
- Patricia Davenport
- Division of Newborn Medicine Boston Children's Hospital Harvard Medical School Boston MA USA
| | - Martha Sola‐Visner
- Division of Newborn Medicine Boston Children's Hospital Harvard Medical School Boston MA USA
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Sola-Visner M, Leeman KT, Stanworth SJ. Neonatal platelet transfusions: New evidence and the challenges of translating evidence-based recommendations into clinical practice. J Thromb Haemost 2022; 20:556-564. [PMID: 35112471 DOI: 10.1111/jth.15664] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 01/28/2022] [Indexed: 01/19/2023]
Abstract
Platelet transfusions are a common intervention for thrombocytopenia. Although the main reason for transfusing platelets is to improve hemostasis, platelets have many additional physiological roles, including interactions with immune pathways. Much of the evidence base for safe and effective transfusions has been informed by randomized trials in adult patients with hematological malignancies. Only three randomized trials have been conducted in sick neonates. These trials have indicated evidence of harm, including a significantly higher rate of death or major bleeding within 28 days after randomization for the largest trial, which enrolled 660 infants. The overall research indicates limited effectiveness of platelet transfusions to reduce bleeding risk. It is important that the results of trials are implemented into practice, but uptake of research findings into neonatal medicine remains inconsistent, as for many areas of health care. There is a need to establish which potential implementation strategies (cost-) efficiently enact change, such as audit and feedback, automated reminder systems for ordering transfusions, and use of opinion leaders. Research is exploring potential mechanisms underlying the lack of effectiveness of platelet transfusions and the increased bleeding and mortality observed in neonatal randomized trials. One potential mechanism concerns the roles of platelets to promote excessive angiogenic signals during a vulnerable period of brain development. A further hypothesis explores the effects of transfusing "adult" platelets into "neonatal" thrombocytopenic blood on primary hemostasis and immune responses.
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Affiliation(s)
- Martha Sola-Visner
- Pediatrics, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Kristen T Leeman
- Pediatrics, Boston Children's Hospital, Harvard Neonatal-Perinatal Fellowship Program, Harvard Medical School, Boston, Massachusetts, USA
| | - Simon J Stanworth
- Haematology and Transfusion Medicine, Department of Haematology, NHS Blood and Transplant, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
- Radcliffe Department of Medicine, University of Oxford, Oxford, UK
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Abstract
The neonatal hemostatic system is strikingly different from that of adults. Among other differences, neonates exhibit hyporeactive platelets and decreased levels of coagulation factors, the latter translating into prolonged clotting times (PT and PTT). Since pre-term neonates have a high incidence of bleeding, particularly intraventricular hemorrhages, neonatologists frequently administer blood products (i.e., platelets and FFP) to non-bleeding neonates with low platelet counts or prolonged clotting times in an attempt to overcome these "deficiencies" and reduce bleeding risk. However, it has become increasingly clear that both the platelet hyporeactivity as well as the decreased coagulation factor levels are effectively counteracted by other factors in neonatal blood that promote hemostasis (i.e., high levels of vWF, high hematocrit and MCV, reduced levels of natural anticoagulants), resulting in a well-balanced neonatal hemostatic system, perhaps slightly tilted toward a prothrombotic phenotype. While life-saving in the presence of active major bleeding, the administration of platelets and/or FFP to non-bleeding neonates based on laboratory tests has not only failed to decrease bleeding, but has been associated with increased neonatal morbidity and mortality in the case of platelets. In this review, we will present a clinical overview of bleeding in neonates (incidence, sites, risk factors), followed by a description of the key developmental differences between neonates and adults in primary and secondary hemostasis. Next, we will review the clinical tests available for the evaluation of bleeding neonates and their limitations in the context of the developmentally unique neonatal hemostatic system, and will discuss current and emerging approaches to more accurately predict, evaluate and treat bleeding in neonates.
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Affiliation(s)
- Patricia Davenport
- Division of Newborn Medicine, Boston Children's Hospital, Boston, MA, United States
| | - Martha Sola-Visner
- Division of Newborn Medicine, Boston Children's Hospital, Boston, MA, United States
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7
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Deschmann E, Saxonhouse MA, Feldman HA, Norman M, Barbian M, Sola-Visner M. Association of Bleeding Scores and Platelet Transfusions With Platelet Counts and Closure Times in Response to Adenosine Diphosphate (CT-ADPs) Among Preterm Neonates With Thrombocytopenia. JAMA Netw Open 2020; 3:e203394. [PMID: 32338750 PMCID: PMC7186855 DOI: 10.1001/jamanetworkopen.2020.3394] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
This cohort study analyzes the association of closure time in response to adenosine diphosphate (CT-ADP) with bleeding score and the associations of platelet transfusions with change in platelet count, CT-ADP, and bleeding scores in preterm neonates with thrombocytopenia.
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Affiliation(s)
- Emoke Deschmann
- Division of Neonatology, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
- Department of Neonatology, Karolinska University Hospital, Stockholm, Sweden
- Division of Newborn Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Matthew A Saxonhouse
- Division of Neonatology, Levine Children's Hospital, Atrium Healthcare, University of North Carolina School of Medicine, Charlotte
| | - Henry A Feldman
- Division of Newborn Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts
- Institutional Centers for Clinical and Translational Research, Boston Children's Hospital, Boston, Massachusetts
| | - Mikael Norman
- Department of Neonatology, Karolinska University Hospital, Stockholm, Sweden
- Division of Pediatrics, Department of Clinical Science, Intervention, and Technology, Karolinska Institutet, Stockholm, Sweden
| | - Maria Barbian
- Division of Neonatology, Levine Children's Hospital, Atrium Healthcare, University of North Carolina School of Medicine, Charlotte
| | - Martha Sola-Visner
- Division of Newborn Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts
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8
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Keene SD, Patel RM, Stansfield BK, Davis J, Josephson CD, Winkler AM. Blood product transfusion and mortality in neonatal extracorporeal membrane oxygenation. Transfusion 2019; 60:262-268. [PMID: 31837026 DOI: 10.1111/trf.15626] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 11/21/2019] [Accepted: 11/21/2019] [Indexed: 01/28/2023]
Abstract
BACKGROUND Neonates receiving extracorporeal membrane oxygenation (ECMO) support are transfused large volumes of red blood cells (RBCs) and platelets (PLTs). Transfusions are often administered in response to specific, but largely unstudied thresholds. The aim of this study is to examine the relationship between RBC and PLT transfusion rates and mortality in neonates receiving ECMO support. STUDY DESIGN AND METHODS We retrospectively examined outcomes of neonates receiving ECMO support in the neonatal intensive care unit (NICU) for respiratory failure between 2010 and 2016 at a single quaternary-referral NICU. We examined the association between RBC and PLT transfusion rate (mL per kg per day) and in-hospital mortality, adjusting for confounding by using a validated composite baseline risk score (Neo-RESCUERS). RESULTS Among the 110 neonates receiving ECMO support, in-hospital mortality was 28%. The median RBC transfusion rate (mL/kg/d) after cannulation was greater among non-survivors, compared to survivors: 12.4 (IQR 9.3-16.2) versus 7.3 (IQR 5.1-10.3), p < 0.001. Similarly, PLT transfusion rate was greater among non-survivors: 22.9 (9.3-16.2) versus 12.1 (8.4-20.1), p = 0.02. After adjusting for baseline mortality risk, both RBC transfusion (adjusted relative risk per 5 mL/kg/d increase: 1.33; 95% CI 1.05-1.69, p = 0.02) and PLT transfusion (adjusted relative risk per 5 mL/kg/d increase: 1.12; 95% CI 1.02-1.23, p = 0.02) were both associated with in-hospital mortality. CONCLUSIONS RBC and PLT transfusion rates are associated with in-hospital mortality among neonates receiving ECMO. These data provide a basis for future studies evaluating more restrictive transfusion practices for neonates receiving ECMO support.
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Affiliation(s)
- Sarah D Keene
- Children's Healthcare of Atlanta, Atlanta, Georgia.,Emory University School of Medicine, Atlanta, Georgia.,Emory + Children's Pediatric Institute, Atlanta, Georgia
| | - Ravi Mangal Patel
- Children's Healthcare of Atlanta, Atlanta, Georgia.,Emory University School of Medicine, Atlanta, Georgia.,Emory + Children's Pediatric Institute, Atlanta, Georgia
| | | | - Joel Davis
- Children's Healthcare of Atlanta, Atlanta, Georgia
| | - Cassandra D Josephson
- Children's Healthcare of Atlanta, Atlanta, Georgia.,Emory University School of Medicine, Atlanta, Georgia
| | - Anne M Winkler
- Emory University School of Medicine, Atlanta, Georgia.,Instrumentation Laboratory, Bedford, Massachusetts
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