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Smith DR, Lim ST, Murphy SJX, Hickey FB, Offiah C, Murphy SM, Collins DR, Coughlan T, O'Neill D, Egan B, O'Donnell JS, O'Sullivan JM, McCabe DJH. von Willebrand factor antigen, von Willebrand factor propeptide and ADAMTS13 activity in TIA or ischaemic stroke patients changing antiplatelet therapy. J Neurol Sci 2024; 463:123118. [PMID: 39024743 DOI: 10.1016/j.jns.2024.123118] [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: 03/29/2024] [Revised: 06/10/2024] [Accepted: 06/28/2024] [Indexed: 07/20/2024]
Abstract
Data are limited on the impact of commencing antiplatelet therapy on von Willebrand Factor Antigen (VWF:Ag) or von Willebrand Factor propeptide (VWFpp) levels and ADAMTS13 activity, and their relationship with platelet reactivity following TIA/ischaemic stroke. In this pilot, observational study, VWF:Ag and VWFpp levels and ADAMTS13 activity were quantified in 48 patients ≤4 weeks of TIA/ischaemic stroke (baseline), and 14 days (14d) and 90 days (90d) after commencing aspirin, clopidogrel or aspirin+dipyridamole. Platelet reactivity was assessed at moderately-high shear stress (PFA-100® Collagen-Epinephrine / Collagen-ADP / INNOVANCE PFA P2Y assays), and low shear stress (VerifyNow® Aspirin / P2Y12, and Multiplate® Aspirin / ADP assays). VWF:Ag levels decreased and VWFpp/VWF:Ag ratio increased between baseline and 14d and 90d in the overall population (P ≤ 0.03). In the clopidogrel subgroup, VWF:Ag levels decreased and VWFpp/VWF:Ag ratio increased between baseline and 14d and 90d (P ≤ 0.01), with an increase in ADAMTS13 activity between baseline vs. 90d (P ≤ 0.03). In the aspirin+dipyridamole subgroup, there was an inverse relationship between VWF:Ag and VWFpp levels with both PFA-100 C-ADP and INNOVANCE PFA P2Y closure times (CTs) at baseline (P ≤ 0.02), with PFA-100 C-ADP, INNOVANCE PFA P2Y and C-EPI CTs at 14d (P ≤ 0.05), and between VWF:Ag levels and PFA-100 INNOVANCE PFA P2Y CTs at 90d (P = 0.03). There was a positive relationship between ADAMTS13 activity and PFA-100 C-ADP CTs at baseline (R2 = 0.254; P = 0.04). Commencing/altering antiplatelet therapy, mainly attributed to commencing clopidogrel in this study, was associated with decreasing endothelial activation following TIA/ischaemic stroke. These data enhance our understanding of the impact of VWF:Ag and VWFpp especially on ex-vivo platelet reactivity status at high shear stress after TIA/ischaemic stroke.
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Affiliation(s)
- D R Smith
- Vascular Neurology Research Foundation, c/o Department of Neurology, Tallaght University Hospital (TUH) / The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital (AMNCH), Dublin, Ireland; Department of Neurology, TUH / AMNCH, Dublin, Ireland; Academic Unit of Neurology, School of Medicine, Trinity College Dublin, Ireland
| | - S T Lim
- Department of Neurology, TUH / AMNCH, Dublin, Ireland; Stroke Service, TUH / AMNCH, Dublin, Ireland; Department of Clinical and Movement Neurosciences, Royal Free Campus, UCL Queen Square Institute of Neurology, London, UK; Academic Unit of Neurology, School of Medicine, Trinity College Dublin, Ireland
| | - S J X Murphy
- Department of Neurology, TUH / AMNCH, Dublin, Ireland; Stroke Service, TUH / AMNCH, Dublin, Ireland; Academic Unit of Neurology, School of Medicine, Trinity College Dublin, Ireland
| | - F B Hickey
- Trinity Centre for Health Sciences, Dept. of Clinical Medicine, School of Medicine, Trinity College Dublin, Ireland
| | - C Offiah
- Department of Neurology, TUH / AMNCH, Dublin, Ireland; Stroke Service, TUH / AMNCH, Dublin, Ireland; Academic Unit of Neurology, School of Medicine, Trinity College Dublin, Ireland
| | - S M Murphy
- Department of Neurology, TUH / AMNCH, Dublin, Ireland; Stroke Service, TUH / AMNCH, Dublin, Ireland; Academic Unit of Neurology, School of Medicine, Trinity College Dublin, Ireland
| | - D R Collins
- Department of Age-Related Health Care, TUH / AMNCH, Dublin, Ireland; Stroke Service, TUH / AMNCH, Dublin, Ireland
| | - T Coughlan
- Department of Age-Related Health Care, TUH / AMNCH, Dublin, Ireland; Stroke Service, TUH / AMNCH, Dublin, Ireland
| | - D O'Neill
- Department of Age-Related Health Care, TUH / AMNCH, Dublin, Ireland; Stroke Service, TUH / AMNCH, Dublin, Ireland
| | - B Egan
- Department of Vascular Surgery, TUH / AMNCH, Dublin, Ireland
| | - J S O'Donnell
- National Coagulation Centre, St James's Hospital, Dublin, Ireland; Irish Centre for Vascular Biology, School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - J M O'Sullivan
- Irish Centre for Vascular Biology, School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - D J H McCabe
- Vascular Neurology Research Foundation, c/o Department of Neurology, Tallaght University Hospital (TUH) / The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital (AMNCH), Dublin, Ireland; Department of Neurology, TUH / AMNCH, Dublin, Ireland; Stroke Service, TUH / AMNCH, Dublin, Ireland; Department of Clinical and Movement Neurosciences, Royal Free Campus, UCL Queen Square Institute of Neurology, London, UK; Academic Unit of Neurology, School of Medicine, Trinity College Dublin, Ireland.
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Valke LLFG, Rijpma S, Meijer D, Schols SEM, van Heerde WL. Thrombin generation assays to personalize treatment in bleeding and thrombotic diseases. Front Cardiovasc Med 2022; 9:1033416. [PMID: 36440026 PMCID: PMC9684194 DOI: 10.3389/fcvm.2022.1033416] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 10/26/2022] [Indexed: 07/30/2023] Open
Abstract
Treatment of bleeding and thrombotic disorders is highly standardized and based on evidence-based medicine guidelines. These evidence-based treatment schemes are well accepted but may lead to either insufficient treatment or over-dosing, because the individuals' hemostatic properties are not taken into account. This can potentially introduce bleeding or thrombotic complications in individual patients. With the incorporation of pharmacokinetic (PK) and pharmacodynamic (PK-PD) parameters, based on global assays such as thrombin generation assays (TGAs), a more personalized approach can be applied to treat either bleeding or thrombotic disorders. In this review, we will discuss the recent literature about the technical aspects of TGAs and the relation to diagnosis and management of bleeding and thrombotic disorders. In patients with bleeding disorders, such as hemophilia A or factor VII deficiency, TGAs can be used to identify patients with a more severe bleeding phenotype and also in the management with non-replacement therapy and/or bypassing therapy. These assays have also a role in patients with venous thrombo-embolism, but the usage of TGAs in patients with arterial thrombosis is less clear. However, there is a potential role for TGAs in the monitoring of (long-term) antithrombotic therapy, for example with the use of direct oral anticoagulants. Finally this review will discuss controversies, limitations and knowledge gaps in relation to the introduction of TGAs to personalize medicine in daily medical practice.
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Affiliation(s)
- Lars L. F. G. Valke
- Department of Hematology, Radboud University Medical Center, Nijmegen, Netherlands
- Hemophilia Treatment Center, Nijmegen, Netherlands
| | - Sanna Rijpma
- Department of Laboratory Medicine, Laboratory of Hematology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Danielle Meijer
- Department of Laboratory Medicine, Laboratory of Hematology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Saskia E. M. Schols
- Department of Hematology, Radboud University Medical Center, Nijmegen, Netherlands
- Hemophilia Treatment Center, Nijmegen, Netherlands
| | - Waander L. van Heerde
- Department of Hematology, Radboud University Medical Center, Nijmegen, Netherlands
- Hemophilia Treatment Center, Nijmegen, Netherlands
- Enzyre BV, Novio Tech Campus, Nijmegen, Netherlands
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Lim S, Murphy S, Murphy S, Coughlan T, O'Neill D, Tierney S, Egan B, Collins D, McCarthy A, Lim SY, Smith D, Cox D, McCabe D. Assessment of on-treatment platelet reactivity at high and low shear stress and platelet activation status after the addition of dipyridamole to aspirin in the early and late phases after TIA and ischaemic stroke. J Neurol Sci 2022; 441:120334. [DOI: 10.1016/j.jns.2022.120334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 05/30/2022] [Accepted: 06/30/2022] [Indexed: 11/24/2022]
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Melnichnikova OS, Nazarova IA, Sirotkina OV, Panov AV, Abesadze IT, Alugishvili MZ, Lokhovinina NL, Vavilova TV. [Integral tests of the hemostasis system in assessing the efficiency of acetylsalicylic acid in patients with ischemic heart disease]. BIOMEDIT︠S︡INSKAI︠A︡ KHIMII︠A︡ 2021; 67:427-433. [PMID: 34730556 DOI: 10.18097/pbmc20216705427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Despite the fact that acetylsalicylic acid (ASA) is the "gold" standard for the prevention of cardiovascular complications in patients with coronary heart disease (CAD), a number of patients still have risks of atherothrombosis. In the present study, the antithrombotic effect of ASA in patients with CAD was assessed in platelet-rich plasma (PRP) using integral tests of the hemostasis study: the T-TAS system (Total Thrombus-formation Analysis System) and the thrombin generation test (TGT). The study involved 34 patients with stable CAD (11 women, 23 men) and people (15 women, 18 men) in the control group. As a result of assessing the activity of thrombus formation using the T-TAS system, a significant decrease in the area under the curve (AUC10) was found in the group with CAD patients compared with the control (135.6 [88.0-222.3] and 260.5 [217.3-301.9], respectively, p.
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Affiliation(s)
- O S Melnichnikova
- V.A. Almazov National Medical Research Center, St.Petersburg, Russia
| | - I A Nazarova
- V.A. Almazov National Medical Research Center, St.Petersburg, Russia
| | - O V Sirotkina
- V.A. Almazov National Medical Research Center, St.Petersburg, Russia; Petersburg Nuclear Physics Institute named by B.P. Konstantinov of National Research Centre "Kurchatov Institute", St.Petersburg, Russia
| | - A V Panov
- V.A. Almazov National Medical Research Center, St.Petersburg, Russia
| | - I T Abesadze
- V.A. Almazov National Medical Research Center, St.Petersburg, Russia
| | - M Z Alugishvili
- V.A. Almazov National Medical Research Center, St.Petersburg, Russia
| | - N L Lokhovinina
- V.A. Almazov National Medical Research Center, St.Petersburg, Russia
| | - T V Vavilova
- V.A. Almazov National Medical Research Center, St.Petersburg, Russia
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de Breet CPDM, Zwaveling S, Vries MJA, van Oerle RG, Henskens YMC, Van't Hof AWJ, van der Meijden PEJ, Veenstra L, Ten Cate H, Olie RH. Thrombin Generation as a Method to Identify the Risk of Bleeding in High Clinical-Risk Patients Using Dual Antiplatelet Therapy. Front Cardiovasc Med 2021; 8:679934. [PMID: 34179143 PMCID: PMC8224526 DOI: 10.3389/fcvm.2021.679934] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 05/04/2021] [Indexed: 01/29/2023] Open
Abstract
Background: Patients using dual antiplatelet therapy after percutaneous coronary intervention are at risk for bleeding. It is currently unknown whether thrombin generation can be used to identify patients receiving dual antiplatelet therapy with increased bleeding risk. Objectives: To investigate whether thrombin generation measurement in plasma provides additional insight into the assessment of bleeding risk for high clinical-risk patients using dual antiplatelet therapy. Methods: Coagulation factors and thrombin generation in platelet-poor plasma were measured in 93 high clinical-risk frail patients using dual antiplatelet therapy after percutaneous coronary intervention. During 12-month follow-up, clinically relevant bleedings were reported. Thrombin generation at 1 and 6 months after percutaneous coronary intervention was compared between patients with and without bleeding events. Results: One month after percutaneous coronary intervention, the parameters of thrombin generation, endogenous thrombin potential, peak height, and velocity index were significantly lower in patients with bleeding in the following months compared to patients without bleeding. At 6 months follow-up, endogenous thrombin potential, peak height, and velocity index were still (significantly) decreased in the bleeding group as compared to non-bleeders. Thrombin generation in the patients' plasma was strongly dependent on factor II, V, and VIII activity and fibrinogen. Conclusion: High clinical-risk patients using dual antiplatelet therapy with clinically relevant bleeding during follow-up show reduced and delayed thrombin generation in platelet-poor plasma, possibly due to variation in coagulation factors. Thus, impaired thrombin-generating potential may be a "second hit" on top of dual antiplatelet therapy, increasing the bleeding risk in high clinical-risk patients. Thrombin generation has the potential to improve the identification of patients using dual antiplatelet therapy at increased risk of bleeding.
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Affiliation(s)
- C P D M de Breet
- Department of Internal Medicine, Maastricht Universitair Medisch Centrum+, Maastricht, Netherlands.,Department of Internal Medicine, Zuyderland Medisch Centrum, Heerlen, Netherlands
| | - S Zwaveling
- Department of Biochemistry-CARIM, Maastricht University, Maastricht, Netherlands.,Groene Hart Ziekenhuis, Gouda, Netherlands
| | - M J A Vries
- Department of Internal Medicine, Jeroen Bosch Ziekenhuis, 's-Hertogenbosch, Netherlands
| | - R G van Oerle
- Department of Biochemistry-CARIM, Maastricht University, Maastricht, Netherlands
| | - Y M C Henskens
- Department of Biochemistry-CARIM, Maastricht University, Maastricht, Netherlands
| | - A W J Van't Hof
- Department of Cardiology, Zuyderland Medisch Centrum, Heerlen, Netherlands.,Department of Cardiology, Maastricht Universitair Medisch Centrum+, Maastricht, Netherlands
| | | | - L Veenstra
- Department of Cardiology, Zuyderland Medisch Centrum, Heerlen, Netherlands
| | - H Ten Cate
- Department of Internal Medicine, Maastricht Universitair Medisch Centrum+, Maastricht, Netherlands.,Department of Biochemistry-CARIM, Maastricht University, Maastricht, Netherlands
| | - R H Olie
- Department of Internal Medicine, Maastricht Universitair Medisch Centrum+, Maastricht, Netherlands.,Department of Biochemistry-CARIM, Maastricht University, Maastricht, Netherlands
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Kinsella JA, Tobin WO, Kavanagh GF, O'Donnell JS, McGrath RT, Tierney S, Feeley TM, Egan B, O'Neill D, Collins DR, Coughlan T, Harbison JA, Doherty CP, Madhavan P, Moore DJ, O'Neill SM, Colgan MP, Saqqur M, Murphy RP, Moran N, Hamilton G, McCabe DJH. Increased thrombin generation potential in symptomatic versus asymptomatic moderate or severe carotid stenosis and relationship with cerebral microemboli. J Neurol Neurosurg Psychiatry 2015; 86:460-7. [PMID: 25033981 DOI: 10.1136/jnnp-2013-307556] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
INTRODUCTION The importance of thrombin generation in the pathogenesis of TIA or stroke and its relationship with cerebral microembolic signals (MES) in asymptomatic and symptomatic carotid stenosis has not been comprehensively assessed. METHODS Plasma thrombin generation parameters from patients with moderate or severe (≥ 50%) asymptomatic carotid stenosis were compared with those from patients with symptomatic carotid stenosis in the early (≤ 4 weeks) and late phases (≥ 3 months) after TIA or stroke in this prospective, pilot observational study. Thrombin generation profile was longitudinally assessed in symptomatic patients with data at each time point. Bilateral transcranial Doppler ultrasound monitoring of the middle cerebral arteries was performed whenever possible to classify patients as MES-positive or MES-negative. RESULTS Data from 31 asymptomatic, 46 'early symptomatic' and 35 'late symptomatic' patients were analysed. Peak thrombin (344.2 nM vs 305.3 nM; p = 0.01) and endogenous thrombin potential (1772.4 vs 1589.7; p = 0.047) were higher in early symptomatic than asymptomatic patients. Peak thrombin production decreased in symptomatic patients followed up from the early to late phase after TIA or stroke (339.7 nM vs 308.6 nM; p = 0.02). Transcranial Doppler ultrasound data were available in 25 asymptomatic, 31 early symptomatic and 27 late symptomatic patients. Early symptomatic MES-positive patients had a shorter 'time-to-peak thrombin' than asymptomatic MES-positive patients (p=0.04), suggesting a more procoagulant state in this early symptomatic subgroup. DISCUSSION Thrombin generation potential is greater in patients with recently symptomatic than asymptomatic carotid stenosis, and decreases over time following TIA or stroke associated with carotid stenosis. These data improve our understanding of the haemostatic/thrombotic biomarker profile in moderate-severe carotid stenosis.
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Affiliation(s)
- J A Kinsella
- Department of Neurology, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland
| | - W O Tobin
- Department of Neurology, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland
| | - G F Kavanagh
- Department of Neurology, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland
| | - J S O'Donnell
- Haemostasis Research Group, St James Hospital, Trinity College Dublin, Dublin, Ireland
| | - R T McGrath
- Haemostasis Research Group, St James Hospital, Trinity College Dublin, Dublin, Ireland
| | - S Tierney
- Department of Vascular Surgery, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland
| | - T M Feeley
- Department of Vascular Surgery, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland
| | - B Egan
- Department of Vascular Surgery, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland
| | - D O'Neill
- Age-Related Health Care, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland Stroke Service, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland
| | - D R Collins
- Age-Related Health Care, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland Stroke Service, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland
| | - T Coughlan
- Age-Related Health Care, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland Stroke Service, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland
| | - J A Harbison
- Departments of Medicine for the Elderly/Stroke Service, St James Hospital, Trinity College Dublin, Dublin, Ireland
| | - C P Doherty
- Department of Neurology, St James Hospital, Trinity College Dublin, Dublin, Ireland
| | - P Madhavan
- Department of Vascular Surgery, St James Hospital, Trinity College Dublin, Dublin, Ireland
| | - D J Moore
- Department of Vascular Surgery, St James Hospital, Trinity College Dublin, Dublin, Ireland
| | - S M O'Neill
- Department of Vascular Surgery, St James Hospital, Trinity College Dublin, Dublin, Ireland
| | - M P Colgan
- Department of Vascular Surgery, St James Hospital, Trinity College Dublin, Dublin, Ireland
| | - M Saqqur
- Department of Medicine (Neurology), University of Calgary, Alberta, Canada
| | - R P Murphy
- Department of Neurology, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland Stroke Service, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland
| | - N Moran
- Department of Molecular and Cellular Therapeutics, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - G Hamilton
- University Department of Surgery, Royal Free Hampstead NHS Trust, London, UK
| | - D J H McCabe
- Department of Neurology, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland Stroke Service, The Adelaide and Meath Hospital, Dublin, incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland Department of Clinical Neurosciences, Royal Free Campus, UCL Institute of Neurology, London, UK
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Tobin WO, Kinsella JA, Kavanagh GF, O'Donnell JS, McGrath RT, Coughlan T, Collins DR, O'Neill D, Egan B, Tierney S, Feeley TM, Murphy RP, McCabe DJH. Longitudinal assessment of von Willebrand factor antigen and von Willebrand factor propeptide in response to alteration of antiplatelet therapy after TIA or ischaemic stroke. J Neurol 2014; 261:1405-12. [PMID: 24781842 DOI: 10.1007/s00415-014-7362-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2014] [Revised: 04/18/2014] [Accepted: 04/18/2014] [Indexed: 10/25/2022]
Abstract
The impact of commencing or changing antiplatelet therapy on von Willebrand factor antigen (VWF:Ag) and von Willebrand factor propeptide (VWF:Ag II) levels has not been comprehensively assessed following TIA or ischaemic stroke. In this pilot, longitudinal, observational analytical study, VWF:Ag and VWF:Ag II levels were simultaneously quantified in platelet poor plasma by ELISA in patients within 4 weeks of TIA or ischaemic stroke (baseline), and then 14 days (14d) and >90 days (90d) after altering antiplatelet therapy. Ninety-one patients were recruited. Eighteen were initially assessed on no antiplatelet therapy, and then after 14d (N = 17) and 90d (N = 8) on aspirin monotherapy; 21 patients were assessed on aspirin and after 14d and 90d on clopidogrel; 52 were assessed on aspirin monotherapy, and after 14d and 90d on aspirin and dipyridamole combination therapy. VWF:Ag, VWF:Ag II levels and VWF:Ag/VWF:Ag II ratio were unchanged at 14d and 90d in the overall study population (p ≥ 0.1). VWF:Ag and VWF:Ag II levels remained stable at 14d and 90d after commencing aspirin (p ≥ 0.054), and after changing from aspirin to clopidogrel (p ≥ 0.2). Following the addition of dipyridamole MR to aspirin, there was a significant reduction in VWF:Ag levels at 14d (p = 0.03) and 90d (p = 0.005), but not in VWF:Ag II levels (p ≥ 0.3). The addition of dipyridamole to aspirin led to a persistent reduction in VWF:Ag but not in VWF:Ag II levels, suggesting that dipyridamole may inhibit release of platelet-derived VWF:Ag following TIA or ischaemic stroke.
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Affiliation(s)
- W O Tobin
- Department of Neurology, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Dublin, Ireland
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Smid M, Dielis AWJH, Spronk HMH, Rumley A, van Oerle R, Woodward M, ten Cate H, Lowe G. Thrombin generation in the Glasgow Myocardial Infarction Study. PLoS One 2013; 8:e66977. [PMID: 23826181 PMCID: PMC3691168 DOI: 10.1371/journal.pone.0066977] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Accepted: 05/15/2013] [Indexed: 01/30/2023] Open
Abstract
Background Thrombin is a key protease in coagulation also implicated in complex pathology including atherosclerosis. To address the role of thrombin in relation to myocardial infarction (MI) we explored thrombin generation analysis in plasma from patients and controls that had participated in the Glasgow MI Study (GLAMIS). Methods Thrombin generation at 1 and 2 pM TF and with and without thrombomodulin (TM) was performed on plasmas from 356 subjects (171 cases, 185 age and sex matched controls) from GLAMIS collected between 3 and 9 months after the MI event. Results Although thrombin generation was slightly delayed in cases (lag time increased from 3.3 to 3.6 min) at the highest trigger, the overall potential to generate thrombin was increased by 7% for the ETP and by 15% for the peak height (both at the 1 pM TF trigger) in cases. Addition of TM did not reveal differences. Furthermore, an increased thrombin generation was associated with MI [normalized ETP: adjusted OR for the highest percentile = 2.4 (95% CI 1.3–4.5) and normalized peak height: adjusted OR = 2.6 (1.3–5.0)] at the lowest trigger; normalized ETP and peak height being 2.1 (1.1–3.8) and 2.0 (1.0–4.1) at the higher 2 pM trigger. Conclusion In GLAMIS, patients with a previous MI had an increased thrombin generation compared to controls. The absence of a clear difference in TM reduction suggests an unaltered anticoagulant activity in these patients. Further research is needed in order to unravel the underlying mechanisms of enhanced thrombin generation after MI.
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Affiliation(s)
- Machiel Smid
- Laboratory of Clinical Thrombosis and Haemostasis, Department of Internal Medicine, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Arne W. J. H. Dielis
- Laboratory of Clinical Thrombosis and Haemostasis, Department of Internal Medicine, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Henri M. H. Spronk
- Laboratory of Clinical Thrombosis and Haemostasis, Department of Internal Medicine, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Ann Rumley
- Institute of Cardiovascular and Medical Studies, University of Glasgow, Glasgow, United Kingdom
| | - Rene van Oerle
- Laboratory of Clinical Thrombosis and Haemostasis, Department of Internal Medicine, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Mark Woodward
- George Institute, University of Sydney, Sydney, Australia
| | - Hugo ten Cate
- Laboratory of Clinical Thrombosis and Haemostasis, Department of Internal Medicine, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
- * E-mail:
| | - Gordon Lowe
- Institute of Cardiovascular and Medical Studies, University of Glasgow, Glasgow, United Kingdom
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Gremmel T, Panzer S, Steiner S, Seidinger D, Koppensteiner R, Pabinger I, Kopp CW, Ay C. Response to antiplatelet therapy is independent of endogenous thrombin generation potential. Thromb Res 2013; 132:e24-30. [PMID: 23623170 DOI: 10.1016/j.thromres.2013.04.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Revised: 03/14/2013] [Accepted: 04/07/2013] [Indexed: 02/02/2023]
Abstract
BACKGROUND Thrombin is the most potent platelet activator, and achieves rapid platelet activation even in the presence of antiplatelet therapy. Since activated platelets respond stronger to additional stimuli, the extent of endogenous thrombin generation may in part be responsible for the reported response variability to aspirin and clopidogrel therapy. PATIENTS AND METHODS Thrombin generation potential was measured with a commercially available assay, and platelet reactivity was assessed with the vasodilator-stimulated phosphoprotein (VASP) phosphorylation assay, light transmission aggregometry (LTA), the VerifyNow aspirin and P2Y12 assays, and multiple electrode aggregometry (MEA) in 316 patients on dual antiplatelet therapy undergoing angioplasty and stenting. RESULTS Peak thrombin, the lag phase and the area under the curve of thrombin generation correlated poorly with on-treatment platelet reactivity by all test systems. High on-treatment residual platelet reactivity (HRPR) in response to arachidonic acid was seen in 33 (10.5%), 41 (13%), and 79 (25.7%) patients by LTA, the VerifyNow aspirin assay, and MEA, respectively. HRPR in response to adenosine diphosphate was seen in 150 (48.1%), 48 (15.3%), 106 (33.7%), and 118 (38.3%) patients by the VASP assay, LTA, the VerifyNow P2Y12 assay, and MEA, respectively. Peak thrombin generation did not differ between patients without and with HRPR by the VASP assay, LTA, the VerifyNow P2Y12 assay and MEA. In the VerifyNow aspirin assay, patients without HRPR had higher peak thrombin generation than patients with HRPR (p=0.01). Finally, patients without and with high peak thrombin generation exhibited similar on-treatment platelet reactivity by all test systems, and high peak thrombin generation occurred to a similar extent in patients without and with HRPR. CONCLUSION Response to antiplatelet therapy with aspirin and clopidogrel is not associated with thrombin generation potential.
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Affiliation(s)
- Thomas Gremmel
- Division of Angiology, Department of Internal Medicine II, Medical University of Vienna, Vienna, Austria.
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