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Bavinck AP, Heerde WV, Schols SEM. Point-of-Care Testing in Patients with Hereditary Disorders of Primary Hemostasis: A Narrative Review. Semin Thromb Hemost 2024. [PMID: 38950596 DOI: 10.1055/s-0044-1787976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/03/2024]
Abstract
Inherited disorders of primary hemostasis, such as von Willebrand disease and congenital platelet disorders, can cause extensive, typically mucocutaneous bleeding. Assays to diagnose and monitor these disorders, such as von Willebrand factor activity assays and light transmission aggregometry, are performed in specialized hemostasis laboratories but are commonly not available in local hospitals. Due to the complexity and relative scarcity of these conventional assays, point-of-care tests (POCT) might be an attractive alternative in patients with hereditary bleeding disorders. POCTs, such as thromboelastography, are increasingly used to assess hemostasis in patients with acquired hemostatic defects, aiding clinical decision-making in critical situations, such as during surgery or childbirth. In comparison, the use of these assays in patients with hereditary hemostasis defects remains relatively unexplored. This review aims to give an overview of point-of-care hemostasis tests in patients with hereditary disorders of primary hemostasis. A summary of the literature reporting on the performance of currently available and experimental POCTs in these disorders is given, and the potential utility of the assays in various use scenarios is discussed. Altogether, the studies included in this review reveal that several POCTs are capable of identifying and monitoring severe defects in the primary hemostasis, while a POCT that can reliably detect milder defects of primary hemostasis is currently lacking. A better understanding of the strengths and limitations of POCTs in assessing hereditary defects of primary hemostasis is needed, after which these tests may become available for clinical practice, potentially targeting a large group of patients with milder defects of primary hemostasis.
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Affiliation(s)
- Aernoud P Bavinck
- Department of Hematology, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Waander van Heerde
- Department of Hematology, Radboud University Medical Centre, Hemophilia Treatment Centre Nijmegen-Eindhoven-Maastricht, Nijmegen, The Netherlands
| | - Saskia E M Schols
- Department of Hematology, Radboud University Medical Centre, Hemophilia Treatment Centre Nijmegen-Eindhoven-Maastricht, Nijmegen, The Netherlands
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2
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Nash J, Davies A, Saunders CV, George CE, Williams JO, James PE. Quantitative increases of extracellular vesicles in prolonged cold storage of platelets increases the potential to enhance fibrin clot formation. Transfus Med 2023; 33:467-477. [PMID: 37553476 DOI: 10.1111/tme.12989] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 07/04/2023] [Accepted: 07/26/2023] [Indexed: 08/10/2023]
Abstract
BACKGROUND Platelet derived extracellular vesicles (EVs) display a pro-coagulant phenotype and are generated throughout platelet concentrate (PC) storage. Cold storage (CS) of PCs is thought to provide a superior haemostatic advantage over room temperature (RT) storage and could prolong the storage time. However, the effect of storage conditions on EV generation and PC function is unknown. We investigated EV production under CS and RT conditions and assessed whether these EVs exhibited a more pro-coagulant phenotype in model experiments. MATERIALS AND METHODS Buffy-coat-derived PCs in a platelet additive solution (PAS) to plasma ratio of approximately 65:35 were stored at RT (22 ± 2°C) or CS (4 ± 2°C) for a prolonged storage duration of 20 days. Impedance aggregometry assessed platelet function. EVs were isolated throughout storage and quantified using nanoparticle tracking analysis. EVs were applied to a coagulation assay to assess the impact on fibrin clot formation and lysis. RESULTS CS produced significantly larger EVs from day 4 onwards. EV concentration was significantly increased in CS compared to RT from day 15. EVs, regardless of storage, significantly reduced time to clot formation and maximum optical density measured compared to the no EV control. Clot formation was proportionate to the number of EV applied but was not statistically different across storage conditions when corrected for EV number. CONCLUSION EVs in CS and RT units showed similar clot formation capacity. However, the higher number of larger EVs generated in CS compared to RT suggests PC units derived from CS conditions may overall exhibit a haemostatically superior capacity compared to RT storage.
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Affiliation(s)
- J Nash
- Cardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
- Component Development and Research Laboratory, Welsh Blood Service, Pontyclun, UK
| | - A Davies
- Cardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
| | - C V Saunders
- Component Development and Research Laboratory, Welsh Blood Service, Pontyclun, UK
| | - C E George
- Component Development and Research Laboratory, Welsh Blood Service, Pontyclun, UK
| | - J O Williams
- Cardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
| | - P E James
- Cardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
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3
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Garaj M, Durila M, Vajter J, Solcova M, Marecek F, Hrachovinová I. Extracorporeal membrane oxygenation seems to induce impairment of primary hemostasis pathology as measured by a Multiplate analyzer: An observational retrospective study. Artif Organs 2021; 46:899-907. [PMID: 34904233 DOI: 10.1111/aor.14142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 11/12/2021] [Accepted: 12/10/2021] [Indexed: 11/27/2022]
Abstract
BACKGROUND Extracorporeal membrane oxygenation (ECMO) support is often associated with bleeding complications caused by secondary or primary hemostasis pathology. However, there are limited data investigating primary hemostasis using Multiplate aggregometry with specific diagnostics tests for vWF (von Willebrand factor) deficiency. AIMS The aim of this study was to find out whether short-term ECMO produces the pathology of primary hemostasis that is detected by Multiplate aggregometry and to investigate the pathology of vWF. METHODS In this study, blood samples of 20 patients undergoing lung transplantations with short-term perioperative ECMO support were analyzed. The multimeric structure, the levels of von Willebrand factor antigen (vWF), ristocetin cofactor (RCo), collagen-binding protein (CB), and the results of multiple electrode aggregometry RISTO (ristocetin), ADP (adenosine diphosphate), ASPI (Aspirin®; arachidonic acid), and TRAP (thrombin receptor activating peptide) tests were compared to the samples obtained before and after ECMO support. RESULTS The Multiplate ADP and RISTO tests showed the presence of significant pathology in primary hemostasis after surgery (p < 0.05), suggesting the presence of acquired platelet dysfunction. Although the RISTO tests suggest the presence of acquired vWF deficiency, laboratory tests for vWF antigen and RCo and CB tests showed an increase in this case. The multimeric structure of vWF did not show clinically significant deterioration. CONCLUSIONS Multiple aggregometry ADP, ASPI, and TRAP tests seem to be able to detect primary hemostasis pathology (platelets aggregation and adhesion pathology) that is present during short-term perioperative ECMO support in lung transplantation procedures. Interestingly, RISTO tests seem to be more suitable for the diagnosis of platelet dysfunction than the diagnosis of acquired vWF deficiency in this situation.
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Affiliation(s)
- Michal Garaj
- Department of Anesthesiology and Intensive Care Medicine, Second Faculty of Medicine, Charles University and Motol University Hospital, Prague, the Czech Republic
| | - Miroslav Durila
- Department of Anesthesiology and Intensive Care Medicine, Second Faculty of Medicine, Charles University and Motol University Hospital, Prague, the Czech Republic
| | - Jaromir Vajter
- Department of Anesthesiology and Intensive Care Medicine, Second Faculty of Medicine, Charles University and Motol University Hospital, Prague, the Czech Republic
| | - Michaela Solcova
- Department of Clinical Hematology, Motol University Hospital, Prague, the Czech Republic
| | - Frantisek Marecek
- Institute of Hematology and Blood Transfusion, Prague, the Czech Republic
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4
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Kovacevic KD, Greisenegger S, Langer A, Gelbenegger G, Buchtele N, Pabinger I, Petroczi K, Zhu S, Gilbert JC, Jilma B. The aptamer BT200 blocks von Willebrand factor and platelet function in blood of stroke patients. Sci Rep 2021; 11:3092. [PMID: 33542410 PMCID: PMC7862663 DOI: 10.1038/s41598-021-82747-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 01/25/2021] [Indexed: 12/15/2022] Open
Abstract
The effect of conventional anti-platelet agents is limited in secondary stroke prevention, and their effects are blunted under high shear stress in the presence of increased levels of circulating von Willebrand factor (VWF). VWF is critically involved in thrombus formation at sites of stenotic extracranial/intracranial arteries. A third generation anti-VWF aptamer (BT200) has been generated which could be useful for secondary stroke prevention. To characterize the effects of BT200 in blood of patients with large artery atherosclerosis stroke (LAA). Blood samples were obtained from 33 patients with acute stroke or transient ischemic attack to measure inhibition of VWF activity and VWF-dependent platelet function. Patients who received clopidogrel or dual antiplatelet therapy did not differ in VWF dependent platelet function tests from aspirin treated patients. Of 18 patients receiving clopidogrel with or without aspirin, only 3 had a prolonged collagen adenosine diphosphate closure time, and none of the patients had ristocetin induced aggregation in the target range. BT200 concentration-dependently reduced median VWF activity from 178 to < 3%, ristocetin induced platelet aggregation from 40U to < 10U and prolonged collagen adenosine diphosphate closure times from 93 s to > 300 s. Baseline VWF activity correlated (r = 0.86, p < 0.001) with concentrations needed to reduce VWF activity to < 20% of normal, indicating that BT200 acts in a target concentration-dependent manner. Together with a long half-life supporting once weekly administration, the safety and tolerability observed in an ongoing phase I trial, and the existence of a reversal agent, BT200 is an interesting drug candidate.
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Affiliation(s)
- Katarina D Kovacevic
- Department of Clinical Pharmacology, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria.
| | | | - Agnes Langer
- Department of Neurology, Medical University of Vienna, Vienna, Austria
| | - Georg Gelbenegger
- Department of Clinical Pharmacology, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria
| | - Nina Buchtele
- Department of Internal Medicine I, Medical University of Vienna, Vienna, Austria
| | - Ingrid Pabinger
- Division of Hematology, Department of Internal Medicine I, Medical University of Vienna, Vienna, Austria
| | - Karin Petroczi
- Department of Clinical Pharmacology, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria
| | - Shuhao Zhu
- Guardian Therapeutics, Lexington, MA, USA
| | | | - Bernd Jilma
- Department of Clinical Pharmacology, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria
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5
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Nakajima Y, Yada K, Ogiwara K, Furukawa S, Shimonishi N, Shima M, Nogami K. A microchip flow-chamber assay screens congenital primary hemostasis disorders. Pediatr Int 2021; 63:160-167. [PMID: 32640065 DOI: 10.1111/ped.14378] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 06/04/2020] [Accepted: 07/02/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND Von Willebrand disease (VWD) and platelet function disorders (PFDs) are congenital bleeding disorders caused by primary hemostasis defects. Platelet function tests are time-consuming and require considerable amounts of blood sample, and there have been no easy-to-use assays for assessing platelet function quickly and sensitively. We report the usefulness of a microchip flow-chamber system (T-TAS® ) for detecting and/or predicting clinical severity in patients with VWD type 1 and type 2N and platelet storage pool disease. Here, we developed an application of a screening assay for primary hemostasis disorders. METHODS Microchips coated with collagen (PL-chip) and collagen/thromboplastin (AR-chip) were utilized to evaluate platelet thrombus formation (PTF) at high shear and fibrin-rich PTF at low shear, respectively, in whole blood samples from 22 patients with VWD (16 type 2A, four type 2B, two type 3) and four patients with PFDs (two BSS, two Glanzmann thrombasthenia). The time-to-increase by 10 kPa (T10 ) was calculated from flow pressure curves. Also, whole blood-induced platelet aggregation was assessed using Multiplate® analysis. RESULTS PL-chip T10 values ≥10 min successfully distinguished patients with all types of VWD and PFDs from healthy controls, irrespective of age, bleeding scores, and von Willebrand factor levels. However, AR-chip assay incompletely distinguished between type 2A patients and healthy ones. Multiplate analysis permitted screening of PFDs and type 3 VWD, but values in type 2A partially overlapped with those in controls. PL-chip assay did not reflect the clinical severity in these patients. CONCLUSIONS T-TAS with PL-chip could be a quick screening tool for congenital primary hemostasis disorder, VWD, and PFDs.
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Affiliation(s)
- Yuto Nakajima
- Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan
| | - Koji Yada
- Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan.,The Course of Hemophilia Education, Nara Medical University, Kashihara, Nara, Japan
| | - Kenichi Ogiwara
- Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan
| | - Shoko Furukawa
- Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan.,The Course of Thrombosis and Hemostasis Molecular Pathology, Nara Medical University, Kashihara, Nara, Japan
| | - Naruto Shimonishi
- Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan
| | - Midori Shima
- Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan
| | - Keiji Nogami
- Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan
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6
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The aptamer BT200 effectively inhibits von Willebrand factor (VWF) dependent platelet function after stimulated VWF release by desmopressin or endotoxin. Sci Rep 2020; 10:11180. [PMID: 32636459 PMCID: PMC7341806 DOI: 10.1038/s41598-020-68125-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 06/05/2020] [Indexed: 12/19/2022] Open
Abstract
Von Willebrand factor (VWF) plays a major role in arterial thrombosis. Antiplatelet drugs induce only a moderate relative risk reduction after atherothrombosis, and their inhibitory effects are compromised under high shear rates when VWF levels are increased. Therefore, we investigated the ex vivo effects of a third-generation anti-VWF aptamer (BT200) before/after stimulated VWF release. We studied the concentration-effect curves BT200 had on VWF activity, platelet plug formation under high shear rates (PFA), and ristocetin-induced platelet aggregation (Multiplate) before and after desmopressin or endotoxin infusions in healthy volunteers. VWF levels increased > 2.5-fold after desmopressin or endotoxin infusion (p < 0.001) and both agents elevated circulating VWF activity. At baseline, 0.51 µg/ml BT200 reduced VWF activity to 20% of normal, but 2.5-fold higher BT200 levels were required after desmopressin administration (p < 0.001). Similarly, twofold higher BT200 concentrations were needed after endotoxin infusion compared to baseline (p < 0.011). BT200 levels of 0.49 µg/ml prolonged collagen-ADP closure times to > 300 s at baseline, whereas 1.35 µg/ml BT200 were needed 2 h after desmopressin infusion. Similarly, twofold higher BT200 concentrations were necessary to inhibit ristocetin induced aggregation after desmopressin infusion compared to baseline (p < 0.001). Both stimuli elevated plasma VWF levels in a manner representative of thrombotic or pro-inflammatory conditions such as arterial thrombosis. Even under these conditions, BT200 potently inhibited VWF activity and VWF-dependent platelet function, but higher BT200 concentrations were required for comparable effects relative to the unstimulated state.
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7
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Zhu S, Gilbert JC, Liang Z, Kang D, Li M, Tarantino PM, Jilma B. Potent and rapid reversal of the von Willebrand factor inhibitor aptamer BT200. J Thromb Haemost 2020; 18:1695-1704. [PMID: 32275107 PMCID: PMC7384040 DOI: 10.1111/jth.14822] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 03/26/2020] [Accepted: 03/31/2020] [Indexed: 12/20/2022]
Abstract
BACKGROUND BT200, a pegylated form of the aptamer BT100, inhibits binding of von Willebrand factor (VWF) to platelet glycoprotein GPIb, preventing arterial thrombosis in cynomolgus monkeys. It is being developed for secondary prevention of arterial thrombosis such as stroke or myocardial infarction. Inhibition of thrombogenesis by BT200 is expected to provide a therapeutic benefit. However, there may be unexpected bleeding (eg, incidental trauma) in which a reversal agent is required. To address this need, BT101, a complementary aptamer, has been developed to specifically inhibit BT100 and BT200 function. OBJECTIVES To characterize the effects of BT101 both in vitro and in vivo. METHODS The direct interaction between BT101 and the core aptamer BT100 was evaluated using polyacrylamide gel electrophoresis. The binding of BT200 to purified human VWF and inhibition of VWF activity was further characterized using enzyme-linked immunosorbent assay. VWF-dependent platelet function was measured by the platelet function analyzer and aggregometry in whole blood. In addition, both the in vivo pharmacokinetic profile of BT101 as well as its ability to reverse BT200 activity, were evaluated in cynomolgus monkeys. RESULTS BT101 bound to the core aptamer BT100 at a 1:1 ratio, inhibited BT200 binding to purified human VWF, and reversed BT200-induced inhibition of both VWF activity and VWF-dependent platelet function in vitro. After intravenous injection to monkeys, BT101 reversed BT200-induced effects on VWF activity and platelet function within minutes, without causing any adverse effects. CONCLUSIONS The results of this study demonstrate that BT101 is an effective reversal agent for BT200.
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Affiliation(s)
| | | | - Zicai Liang
- Suzhou Ribo Life Science Co., LtdKunshan CityChina
| | - Daiwu Kang
- Suzhou Ribo Life Science Co., LtdKunshan CityChina
| | - Ming Li
- Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghaiChina
| | | | - Bernd Jilma
- Department of Clinical PharmacologyMedical University of ViennaViennaAustria
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8
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Oran I, Cinar C, Bozkaya H, Parildar M, Duman S. Reduced Activity of von Willebrand Factor after Flow-Diverting Stent Implantation for Intracranial Aneurysms: A Link to Acquired von Willebrand Disease? AJNR Am J Neuroradiol 2020; 41:140-146. [PMID: 31896567 DOI: 10.3174/ajnr.a6343] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 10/20/2019] [Indexed: 12/26/2022]
Abstract
BACKGROUND AND PURPOSE Vascular devices generating high shear stress can cause type 2A acquired von Willebrand disease, which is characterized by low von Willebrand factor activity accompanied by hemorrhagic complications. The braided mesh structure of flow-diverting stents with a relatively small strut size can create abnormally high shear stress while arterial blood flows through the stent struts into the aneurysm, and flow-diverting stent may be associated with reduced von Willebrand factor activity. MATERIALS AND METHODS Aneurysmal morphologic parameters and patient data were examined retrospectively among patients who had an unruptured intracranial aneurysm treated with a flow-diverting stent. The RISTOtest (test for whole blood ristocetin-induced platelet aggregation) for von Willebrand factor activity, as well as tests for aspirin and clopidogrel/prasugrel effectiveness, were performed immediately before the endovascular procedure and 24 hours later by multiple electrode aggregometry. RESULTS A total of 39 patients with 56 aneurysms were recruited, and statistical analyses were performed in 32 patents with 49 aneurysms. Compared with the baseline values, von Willebrand factor activity was reduced in 16 patients but increased in 23 patients. Aneurysmal variables (eg, neck area, volume, volume-to-neck area ratio, size ratio, and morphologic index) clearly distinguished patients with reduced von Willebrand factor activity from those with nonreduced von Willebrand factor activity. The receiver operating characteristic curve showed that the morphologic index and volume had the highest discriminative power, with an area under the curve of 0.99. CONCLUSIONS In high-volume/large-neck aneurysms, flow-diverting stent implantation can cause reduced von Willebrand factor activity, which may be linked causally to acquired von Willebrand disease.
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Affiliation(s)
- I Oran
- From the Departments of Radiology (I.O., C.C., H.B., M.P.) .,Dr Oran is currently affiliated with Section of Interventional Radiology, KENT Hospital, Izmir, Turkey
| | - C Cinar
- From the Departments of Radiology (I.O., C.C., H.B., M.P.)
| | - H Bozkaya
- From the Departments of Radiology (I.O., C.C., H.B., M.P.)
| | - M Parildar
- From the Departments of Radiology (I.O., C.C., H.B., M.P.)
| | - S Duman
- Internal Medicine (S.D.), Ege University Medical School, Izmir, Turkey
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9
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Nakajima Y, Nogami K, Yada K, Ogiwara K, Furukawa S, Shimonishi N, Shima M. Whole blood ristocetin‐induced platelet impedance aggregometry does not reflect clinical severity in patients with type 1 von Willebrand disease. Haemophilia 2019; 25:e174-e179. [DOI: 10.1111/hae.13725] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 02/12/2019] [Accepted: 02/12/2019] [Indexed: 11/30/2022]
Affiliation(s)
- Yuto Nakajima
- Department of Pediatrics Nara Medical University Kashihara Nara Japan
| | - Keiji Nogami
- Department of Pediatrics Nara Medical University Kashihara Nara Japan
| | - Koji Yada
- Department of Pediatrics Nara Medical University Kashihara Nara Japan
- The Course of Hemophilia Education Nara Medical University Kashihara Nara Japan
| | - Kenichi Ogiwara
- Department of Pediatrics Nara Medical University Kashihara Nara Japan
| | - Shoko Furukawa
- Department of Pediatrics Nara Medical University Kashihara Nara Japan
- The Course of Thrombosis and Hemostasis Molecular Pathology Nara Medical University Kashihara Nara Japan
| | - Naruto Shimonishi
- Department of Pediatrics Nara Medical University Kashihara Nara Japan
| | - Midori Shima
- Department of Pediatrics Nara Medical University Kashihara Nara Japan
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10
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Bercovitz RS. An introduction to point-of-care testing in extracorporeal circulation and LVADs. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2018; 2018:516-521. [PMID: 30504352 PMCID: PMC6245959 DOI: 10.1182/asheducation-2018.1.516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
There is a delicate balance between bleeding and clotting in patients on circuits such as ventricular assist devices or extracorporeal membrane oxygenation. Traditional coagulation tests, prothrombin time, activated partial thromboplastin time, and anti-factor Xa levels, are used to monitor patients on these devices. However, turnaround times and inability to assess global hemostasis, including platelets and fibrinogen have contributed to a recognition that faster, accurate, and more informative coagulation tests are needed. Activated clotting time is used to monitor heparin in patients on circuits and has the advantages of being a near-patient point-of-care test. However, its utility is limited to heparin monitoring. Viscoelastic tests (thromboelastometry and thromboelastography) are global, whole-blood coagulation tests, and whole-blood platelet aggregometry evaluates platelet function. Ideally, these tests can ensure that patients are within the therapeutic range of their antithrombotic medications, identify patients at risk for hemorrhagic or thrombotic complications, and guide management of acute bleeding complications. This ideal is currently hampered by a lack of studies that delineate clear ranges that are clinically relevant. Future research is needed to better understand the optimal use of point-of-care coagulation testing in patients on extracorporeal circuits and ventricular assist devices.
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Affiliation(s)
- Rachel Sara Bercovitz
- Division of Hematology/Oncology/Stem Cell Transplant, Department of Pediatrics, Feinberg School of Medicine, Northwestern University, Chicago, IL; and Ann & Robert H. Lurie Children's Hospital, Chicago, IL
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11
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Abstract
Von Willebrand disease (VWD) is an inherited bleeding disorder that affects up to 1% of the population. In most cases, VWD results from a mutation in the von Willebrand Factor (VWF) gene, which alters the amount and function of VWF, a key glycoprotein in both primary and secondary hemostasis. A comprehensive analysis of patients with VWD should include VWF activity, antigen levels, platelet function, and a careful bleeding history. Treatment options include antifibrinolytics, desmopressin, and VWF replacement therapy. VWF levels fluctuate due to age, stress, environmental exposures, and pharmacologic treatment. Treatment guidelines exist to treat and prevent bleeding for patients undergoing surgery and medical procedures, but often these must be reevaluated in the setting of age-related comorbidities including cardiovascular events, venous thrombosis, and malignancy. In addition, many age-related complications are associated with a secondary acquired von Willebrand syndrome (AVWS), including malignancies, hypothyroidism, cardiovascular diseases, and cardiac replacement devices. The current literature is limited by a lack of older patients in clinical trials. Larger studies are needed to determine if age-related comorbidities affect VWD patients at different frequencies than the general elderly population. There is also a significant need for registry-based studies to evaluate many age-related comorbidities in VWD patients.
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Affiliation(s)
- John Chapin
- Department of Hematology, Shire, Lexington, MA, USA,
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12
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Haas T, Cushing MM, Varga S, Gilloz S, Schmugge M. Usefulness of multiple electrode aggregometry as a screening tool for bleeding disorders in a pediatric hospital. Platelets 2018; 30:498-505. [DOI: 10.1080/09537104.2018.1475631] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Thorsten Haas
- Department of Anesthesia, University Children’s Hospital Zurich, Zurich, Switzerland
| | - Melissa M. Cushing
- Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Stephanie Varga
- Department of Anesthesia, University Children’s Hospital Zurich, Zurich, Switzerland
| | - Séverine Gilloz
- Department of Hematology, University Children’s Hospital Zurich, Zurich, Switzerland
| | - Markus Schmugge
- Department of Hematology, University Children’s Hospital Zurich, Zurich, Switzerland
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13
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Nummi V, Lassila R, Joutsi-Korhonen L, Armstrong E, Szanto T. Comprehensive re-evaluation of historical von Willebrand disease diagnosis in association with whole blood platelet aggregation and function. Int J Lab Hematol 2018; 40:304-311. [PMID: 29427305 DOI: 10.1111/ijlh.12785] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 01/11/2018] [Indexed: 11/28/2022]
Abstract
INTRODUCTION Diagnosis of von Willebrand disease (VWD) is challenging, particularly for type 1. The current diagnostic guidelines emphasize simultaneous bleeding symptoms and von Willebrand factor (VWF) levels of <30-40 IU/dL. Historical diagnoses require updated evaluation. We assessed the accuracy of past VWD diagnoses in our comprehensive care center with the standardized bleeding score (BS) and central laboratory analysis, focusing on VWF-dependent platelet functions in whole blood. METHODS Our study comprised 83 adults with prior VWD who were diagnosed a median of 20 years ago. We assessed BS, VWF antigen and activity (minimum of 3 measurements), FVIII, PFA-100® , and platelet aggregation via Multiplate® . Genetic testing was targeted to types 3, 2N, 2B, and equivocal cases. RESULTS All 13/13 (100%) type 3 and 29/32 (90%) type 2, but only 10/38 (26%) of type 1 (overall 52/83 (63%)) patients met the current criteria for VWD. All confirmed cases had abnormal BS, impaired PFA-100® , and decreased or absent ristocetin-induced platelet aggregation (RIPA), except subtype 2B. VWF, FVIII, RIPA, and PFA correlated with BS including all study subjects. Ten of the 38 patients with previous type 1 had low VWF (35-50 IU/dL) and variable VWF-dependent platelet function. Altogether, 21/83 patients (25%) had repeatedly normal VWF:RCo (>50 IU/dL). CONCLUSION von Willebrand disease is associated with impaired VWF-dependent whole blood platelet functions that match traditional VWF measurements. We detected normal VWF in 25% of historically diagnosed patients, mainly type 1 patients, implying that there is a need to systematically re-evaluate historical VWD diagnoses.
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Affiliation(s)
- V Nummi
- Faculty of Medicine, University of Helsinki, Helsinki, Finland.,Coagulation Disorders Unit, Department of Hematology and Comprehensive Cancer, Helsinki University Hospital, Helsinki, Finland
| | - R Lassila
- Faculty of Medicine, University of Helsinki, Helsinki, Finland.,Coagulation Disorders Unit, Department of Hematology and Comprehensive Cancer, Helsinki University Hospital, Helsinki, Finland
| | - L Joutsi-Korhonen
- Coagulation Disorders Unit, Department of Clinical Chemistry, HUSLAB Laboratory Services, Helsinki University Hospital, Helsinki, Finland
| | - E Armstrong
- Coagulation Disorders Unit, Department of Hematology and Comprehensive Cancer, Helsinki University Hospital, Helsinki, Finland
| | - T Szanto
- Coagulation Disorders Unit, Department of Clinical Chemistry, HUSLAB Laboratory Services, Helsinki University Hospital, Helsinki, Finland
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