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In-vivo Thrombus Imaging With 18F-GP1, a Novel Platelet PET Radiotracer (iThrombus)

Primary Purpose

Thrombosis, Atherothrombosis, Myocardial Infarction

Status
Completed
Phase
Not Applicable
Locations
United Kingdom
Study Type
Interventional
Intervention
18F-GP1 PET CT
Sponsored by
University of Edinburgh
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional basic science trial for Thrombosis

Eligibility Criteria

40 Years - undefined (Adult, Older Adult)All SexesDoes not accept healthy volunteers

4.2 Myocardial infarction group inclusion/exclusion criteria 4.2.1 Myocardial infarction Inclusion criteria

  • Male or females over the age of 40 with recent (within 7 days) type 1 myocardial infarction (21) awaiting or have undergone inpatient coronary angiography, or with suspected myocardial infarction in the context of confirmed COVID-19 requiring hospital admission.
  • Provision of informed consent prior to any study specific procedures

4.2.2 Myocardial infarction Exclusion Criteria Subjects should not enter the study if any of the following criteria are fulfilled

  • Inability or unwilling to give informed consent.
  • Unable to tolerate the supine position
  • Impaired renal function with eGFR of <30 mL/min/1.73m2
  • Allergy to iodinated contrast
  • Severe or significant comorbidity
  • Women who are pregnant or breastfeeding

4.3 Stable CAD inclusion/exclusion criteria

4.3.1 Stable CAD inclusion criteria

  • Male or females over the age of 40 with stable coronary artery disease who have undergone a recent (<30 days) coronary angiogram + PCI
  • Provision of informed consent prior to any study specific procedures

4.3.2 Stable coronary disease exclusion criteria

  • Myocardial infarction less than 3 months ago
  • Inability or unwilling to give informed consent.
  • Unable to tolerate the supine position
  • Allergy to iodinated contrast
  • Impaired renal function with eGFR of <30 mL/min/1.73m2
  • Severe or significant comorbidity
  • Women who are pregnant or breastfeeding

4.4 Bioprosthetic heart valve inclusion/exclusion criteria

4.4.1 Bioprosthetic aortic valve inclusion criteria

  • Ability to give informed consent
  • Males or females over 40 years of age with recent (up to 6±4 weeks) surgical bioprosthetic heart valve replacement (SAVR or SMVR) or transcatheter bioprosthetic heart valve insertion (TAVI or TMVR).

4.4.2 Bioprosthetic heart valve exclusion criteria

  • Inability to give informed consent
  • Pregnancy
  • Breastfeeding
  • Claustrophobia
  • Allergy to iodinated contrast
  • Liver failure
  • Chronic kidney disease (with estimated glomerular filtration rate <30 mL/min)
  • Paget's disease
  • Metastatic malignancy
  • Inability to tolerate the supine position
  • Women who are pregnant or breastfeeding

4.5 DVT/PE inclusion/exclusion criteria 4.5.1 DVT/PE inclusion criteria

  • Male or females over the age of 40 with recently confirmed (<30 days) DVT on ultrasound or PE on CTPA as per ESC diagnostic guidelines (22), or with suspected DVT or PE in the context of confirmed COVID-19 requiring hospital admission
  • Provision of informed consent prior to any study specific procedures

4.5.2 DVT/PE exclusion criteria

  • Inability or unwilling to give informed consent.
  • Unable to tolerate the supine position
  • Impaired renal function with eGFR of <30 mL/min/1.73m2
  • Allergy to iodinated contrast
  • Contraindication to iodinated contrast agents
  • Severe of significant comorbidity
  • Women who are pregnant or breastfeeding
  • Contra-indication to Magnetic Resonance imaging in the 6 patients offered PET MR scanning.

4.6 Stroke and TIA inclusion/exclusion criteria

4.6.1 Stroke and TIA inclusion criteria

  • Male or females over the age of 40 with recently diagnosed stroke or TIA as per diagnostic criteria of the American Heart and Stroke Association guidelines (23), with or without COVID-19.
  • Provision of informed consent prior to any study specific procedures

4.6.2 Stroke and TIA exclusion criteria

  • Inability or unwilling to give informed consent.
  • Unable to tolerate the supine position
  • Impaired renal function with eGFR of <30 mL/min/1.73m2
  • Allergy to iodinated contrast
  • Contraindication to iodinated contrast agents
  • Severe of significant comorbidity
  • Women who are pregnant or breastfeeding

Sites / Locations

  • University of Edinburgh

Arms of the Study

Arm 1

Arm 2

Arm 3

Arm 4

Arm 5

Arm Type

Experimental

Active Comparator

Active Comparator

Active Comparator

Active Comparator

Arm Label

Myocardial Infarction

Stable coronary disease with intracoronary stent insertion

Deep vein thrombosis and Pulmonary embolus

Surgical and Transcatheter Aortic valve replacement

Transient ischaemic attack and stroke

Arm Description

Outcomes

Primary Outcome Measures

Ratio of 18F-GP1 standardised uptake values (SUV's) in thrombus compared with the SUVs recorded in the blood pool.
Expression of the glycoprotein IIb/IIIa receptor (assessed by SUV) within thrombus in the arterial and venous circulation.

Secondary Outcome Measures

Ratio of 18F-GP1 standardised uptake values (SUV's) in thrombus formed in each of the 5 disease states.
Expression of the glycoprotein IIb/IIIa receptor (assessed by SUV) within thrombus in the arterial and venous circulation in all 5 disease states

Full Information

First Posted
April 22, 2019
Last Updated
October 13, 2021
Sponsor
University of Edinburgh
Collaborators
British Heart Foundation
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1. Study Identification

Unique Protocol Identification Number
NCT03943966
Brief Title
In-vivo Thrombus Imaging With 18F-GP1, a Novel Platelet PET Radiotracer
Acronym
iThrombus
Official Title
In-vivo Thrombus Imaging With 18F-GP1, a Novel Platelet PET Radiotracer
Study Type
Interventional

2. Study Status

Record Verification Date
October 2021
Overall Recruitment Status
Completed
Study Start Date
November 11, 2019 (Actual)
Primary Completion Date
July 2, 2021 (Actual)
Study Completion Date
October 13, 2021 (Actual)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Sponsor
Name of the Sponsor
University of Edinburgh
Collaborators
British Heart Foundation

4. Oversight

Studies a U.S. FDA-regulated Drug Product
No
Studies a U.S. FDA-regulated Device Product
No
Data Monitoring Committee
No

5. Study Description

Brief Summary
To date, the investigators have successfully employed a radiotracer (18F-sodium fluoride) as a marker of necrotic inflammation in human atherosclerosis. The investigators aim to further the mechanistic understanding of atherothrombosis by studying the activation of glycoprotein IIb/IIIa receptors in cardiovascular thrombus using the novel platelet radiotracer (18F-GP1). Binding of 18F-GP1 to activated platelets in venous and arterial thrombi has already been demonstrated in pre-clinical studies and a phase 1 trial in man. If successful, this study would define the role of the glycoprotein IIb/IIIa receptor within in vivo thrombosis across a range of cardiovascular diseases.
Detailed Description
Cardiovascular thrombotic conditions were estimated to account for 1 in 4 deaths worldwide in 2010 and are the leading cause of global mortality. Divided into arterial and venous thromboses, ischaemic heart disease and ischemic stroke comprise the major arterial thromboses and deep-vein thrombosis and pulmonary embolism comprise the major venous thromboses. Although both arterial and venous thrombi differ in both aetiology and pathophysiology, many commonalities remain. Thrombosis begins with damage to the vascular wall. Physiological haemostasis is triggered when underlying collagen is exposed to circulating platelets which bind directly to collagen with collagen-specific glycoprotein surface receptors. After an initial signalling cascade involving release of platelet binder von Willebrand Factor, platelets become activated which allows adherence to the site of injury. Following activation, phospholipase A2 modifies the integrin membrane glycoprotein IIb/IIIa (GP IIb/IIIa) increasing platelet ability to bind fibrinogen. The activated platelets then change shape from spherical to stellate, and the fibrinogen cross-links with glycoprotein IIb/IIIa aiding aggregation of more platelets and completing primary haemostasis. Secondary haemostasis involves activation of the coagulation cascade through extrinsic and intrinsic pathways and ends with cross linked fibrin deposition and a mature thrombus. The haemostatic process is fluid and dynamic with the expression of activated membrane proteins and coagulation factors changing throughout. Platelet expression of GP IIb/IIIa falls as a thrombus matures hence why it is a pharmacological target for antithrombotic therapies. The investigators aim to explore the expression and distribution of GP IIb/IIIa receptors in a range of thrombotic conditions listed below spanning across both arterial and venous systems. Improving understanding of how clinical presentation relates to platelet activation over a range of conditions is crucially important when deciding appropriate anti-thrombotic regimes. 1.2.1 Coronary Heart Disease and Myocardial Infarction Coronary heart disease is the leading cause of death worldwide and is responsible for 17.5 million or 46% of all non-communicable deaths in 2012. The majority of the cardiovascular morbidity and mortality is attributable to coronary atherosclerosis and thrombosis. Atherosclerosis is the central process by which the heart arteries narrow and harden due to the deposition of fatty plaques within the artery wall. This process can result in damage to the lining of the artery which can cause a thrombus (clot) to form within the artery which can partially or completely occlude the flow of blood to the heart muscle thereby precipitating myocardial infarction. This is the commonest form of a heart attack and responsible for a large proportion of sudden cardiac deaths. Thrombus in myocardial infarction is classically thought to be composed of predominantly platelets. However, recent research has shown that 56% of thrombus in MI is composed of fibrin with only 17% platelets. Ischaemic time correlated positively with thrombus fibrin content and negatively with thrombus platelet component. This illustrates the dynamic interaction between platelets and fibrin over time. 1.2.2 Bioprosthetic heart valve thrombosis Bioprosthetic valve thrombosis is an increasingly recognised complication of valve replacement. Patient risks include early prosthesis failure requiring redo operation plus stroke or other systemic embolism. A meta-analysis has estimated the incidence of bioprosthetic thrombosis to be 0.03 per 100 patient years with the risk of embolism being highest in the first 3 months post implantation. The composition of prosthetic valve thrombosis varies depending on valve type and time from insertion. Interestingly in the MISTRAL-C randomised controlled trial, 50% of acute thromboembolic events within 3 days of transcatheter aortic valve insertion were platelet-fibrin thrombus, not calcific debris from the aortic root. Thromboembolism was less common in those on anticoagulant rather than antithrombotic treatment suggesting a fibrin predominance. Similar results were found in a large registry of over 25,000 patients undergoing surgical bioprosthetic valve insertion. Warfarin plus aspirin was more effective than aspirin alone in preventing thromboembolic events and death. 1.2.3 Venous thromboembolic disease Pulmonary embolism is a common cardiovascular condition with a high morbidity and mortality. Embolisation of a venous thrombosis from the deep veins of the lower limbs or pelvis is the aetiology in more than 90% events. Thrombus formation is triggered by intravascular activation of coagulation and thrombin-mediated intraluminal fibrin deposition. Red blood cells (RBCs) are thought to be incorporated into venous thrombi via passive trapping in the growing fibrin network, culminating in the production of a RBC and fibrin rich venous thrombus. Treatment for both DVT and PE reduces mortality and secondary prophylaxis with anticoagulation is effective at preventing further events. The clinically most frequently applied imaging test for visualisation of suspected PE is CT pulmonary angiography (CTPA). For DVT, a range of imaging modalities can be used (US, CT or MR) with ultrasound the most common first line investigation. 1.2.4 Stroke and Transient Ischaemic Attack (TIA) Stroke and TIA are leading causes of preventable death and morbidity worldwide. Thrombus composition is thought to depend on source (cardiac chamber or head or neck artery) and time from event. Fibrin-dominant thrombus is likely to be more refractory to thrombolytic drugs as is the presence of chronic histopathologic features in clots such as endothelialisation and calcification. Diagnosis is based on clinical presentation followed by CT or MRI of the brain with US or MR assessment of carotid stenosis performed thereafter to ascertain future event risk. 1.2.5 COVID-19 The COVID-19 pandemic has resulted in major mortality and morbidity. Consistent clinical concerns have been raised in published literature, news outlets and social media regarding thromboembolic events affecting the microvasculature as well as large vessels. This has received widespread attention and led to the reported use of prophylactic or therapeutic anticoagulation regimes, or even fibrinolysis, outwith standard protocols and indications in the absence of firm evidence of clinical benefit, such is the concern. Given its sensitivity for detecting activated platelets, which our pilot data has suggested may be superior to other imaging modalities in some settings, 18F-GP1 PET-CT may offer a suitable method to examine the posited association between COVID-19 and thromboembolic disease. 1.3 Understanding Platelet Biology As platelet aggregation is a major component of both arterial and venous thrombi, the investigators propose to explore whether a radiolabelled ligand (18F-GP1) of the glycoprotein IIb/IIIa (GPIIb/IIIa) receptor can detect activated platelets on thrombus. GPIIb/IIIa receptors mediate platelet adherence and aggregation. They are expressed in greater numbers and assume a more ligand binding conformation on activation which binds protein ligands including von Willebrand factor and Fibrinogen. This allows for platelet bridging and aggregation. Accordingly, they represent an attractive target for acute thrombus imaging. We hope to identify activated platelets in the five groups presented above. Identification of activated platelets in all conditions will further enhance our understanding of the role of this receptor in both arterial and venous thrombosis and how anti-thrombotic therapy influences expression. 1.4 Glycoprotein IIb/IIIa inhibition Three intravenous platelet glycoprotein (GP) IIb/IIIa inhibitors have been studied extensively and are available for clinical use: abciximab, tirofiban, and eptifibatide. Abciximab is a monoclonal antibody directed against the receptor, while tirofiban and eptifibatide are high affinity non-antibody receptor inhibitors. Antiplatelet therapy with intravenous GP IIb/IIIa inhibitors has been evaluated in patients with acute coronary syndrome (ACS) and in those undergoing intracoronary stent implantation and stroke but not DVT/PE or prosthetic valve implantation. Meta-analyses have evaluated the use of intravenous glycoprotein (GP) IIb/IIIa inhibitors in a variety of settings related to coronary disease. The impact of the intravenous GP IIb/IIIa inhibitors on clinical outcomes was assessed in a pooled analysis of 21 trials involving various groups of patients with ischemic heart disease. The GP IIb/IIIa inhibitor reduced the combined end point of death, nonfatal myocardial infarction (MI), or urgent revascularization at 30 days in the following groups of patients: Those undergoing a percutaneous coronary intervention (PCI) Those with non-ST elevation myocardial infarction (NSTEMI) Those with an ST elevation MI (STEMI) treated with percutaneous transluminal coronary angioplasty (PTCA) However, these trials were performed largely before the routine use drug eluting stents and dual oral antiplatelet therapy with aspirin and a platelet P2Y12 receptor blocker. In summary, the role of P2Y12 inhibitors has decreased the role of GP IIb/IIIa therapy in coronary heart disease, although it continues to be important in some subgroups of patients. We aim to explore the expression of activated platelets within both stable and unstable coronary disease and how PCI and use of anti-thrombotic drugs (P2Y12 and GPIIb/IIIa inhibitors) mediate expression. In stroke disease, a single randomised controlled trial (SaTIS) performed in moderate ischaemic stroke demonstrated a significant reduction in mortality at 5 months with tirofiban when compared to placebo. Importantly there was no difference in major haemorrhage.The investigators aim to explore the expression of GPIIb/IIIa in stroke and TIA and explore how it may differ in the embolised thrombus when compared with the culprit plaque. Efficacy of GPIIb/IIIa inhibition in recent bioprosthetic valve insertion and DVT/PE is unknown. We aim to explore activated platelet expression in both conditions to gain insight as to whether GPIIb/IIIa inhibition may be a potentially useful treatment. 1.5 Background of 18F-GP1 GP1 is a ligand of the fiban class of molecule which has a high affinity for the glycoprotein IIb/IIIa receptor; highly expressed on activated platelets. It is an excellent target for imaging arterial thrombi with a large activated platelet component. After a 2 step radiofluorination subsequent purification process 18F-GP1 can be used for PET imaging. 18F-GP1 has undergone pre-clinical and phase 1 clinical evaluation demonstrating a high affinity to GPIIb/IIIa, the key receptor for platelet aggregation. It binds in a stable and specific manner to in vivo arterial, venous and intracardiac human thrombus. Binding is crucially not altered by anticoagulation therapy (aspirin and heparin). In the recent phase 1 study 18F-GP1 demonstrated a high detection rate of thromboembolic foci in 20 patients with recently formed deep vein thrombi (DVT) and pulmonary thromboemboli. The tracer also performed favourably with regards to its metabolism, pharmacokinetic and dosimetry profile. There were no significant adverse events in any of the 20 recruited participants. 1.6 Study Aims We aim to examine the expression of the glycoprotein IIb/IIIa receptor in: Intracoronary thrombus following spontaneous myocardial infarction Intracoronary thrombus following routine stent insertion. Bioprosthetic heart valve thrombosis (surgical or transcatheter valves). Venous thromboembolic disease in those with recently confirmed deep vein thrombosis and pulmonary embolism. Carotid and cerebral thrombus in those with stroke and TIA. This would enhance our understanding of the incidence, consequences and natural history of platelet activation within cardiovascular thrombosis. 1.7 Research Hypothesis GPIIb/IIIa receptor expression is varied by thrombotic condition including venous (DVT/PE) versus arterial (MI/stroke), in situ (MI) versus embolic (stroke, PE) and prosthetic material (stents and valves) versus diseased native tissue (MI, stroke, DVT/PE). 1.8 Rationale for Study To date, the investigators have successfully employed a radiotracer (18F-sodium fluoride) as a marker of necrotic inflammation in human atherosclerosis. Binding of 18F-GP1 to activated platelets in venous and arterial thrombi has already been demonstrated in pre-clinical studies and a phase 1 trial in man. If successful, this study would define the role of the glycoprotein IIb/IIIa receptor within in vivo thrombosis across a range of cardiovascular diseases.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Thrombosis, Atherothrombosis, Myocardial Infarction, STEMI, NSTEMI - Non-ST Segment Elevation MI, DVT, Pulmonary Embolism, Stroke, Transient Ischemic Attack, Prosthetic Valve Thrombosis, PET

7. Study Design

Primary Purpose
Basic Science
Study Phase
Not Applicable
Interventional Study Model
Parallel Assignment
Model Description
Single centre prospective pilot study
Masking
None (Open Label)
Allocation
Non-Randomized
Enrollment
73 (Actual)

8. Arms, Groups, and Interventions

Arm Title
Myocardial Infarction
Arm Type
Experimental
Arm Title
Stable coronary disease with intracoronary stent insertion
Arm Type
Active Comparator
Arm Title
Deep vein thrombosis and Pulmonary embolus
Arm Type
Active Comparator
Arm Title
Surgical and Transcatheter Aortic valve replacement
Arm Type
Active Comparator
Arm Title
Transient ischaemic attack and stroke
Arm Type
Active Comparator
Intervention Type
Diagnostic Test
Intervention Name(s)
18F-GP1 PET CT
Intervention Description
PET CT scan using platelet radiotracer 18F-GP1
Primary Outcome Measure Information:
Title
Ratio of 18F-GP1 standardised uptake values (SUV's) in thrombus compared with the SUVs recorded in the blood pool.
Description
Expression of the glycoprotein IIb/IIIa receptor (assessed by SUV) within thrombus in the arterial and venous circulation.
Time Frame
6 months from end of recruitment
Secondary Outcome Measure Information:
Title
Ratio of 18F-GP1 standardised uptake values (SUV's) in thrombus formed in each of the 5 disease states.
Description
Expression of the glycoprotein IIb/IIIa receptor (assessed by SUV) within thrombus in the arterial and venous circulation in all 5 disease states
Time Frame
6 months from end of recruitment

10. Eligibility

Sex
All
Minimum Age & Unit of Time
40 Years
Accepts Healthy Volunteers
No
Eligibility Criteria
4.2 Myocardial infarction group inclusion/exclusion criteria 4.2.1 Myocardial infarction Inclusion criteria Male or females over the age of 40 with recent (within 7 days) type 1 myocardial infarction (21) awaiting or have undergone inpatient coronary angiography, or with suspected myocardial infarction in the context of confirmed COVID-19 requiring hospital admission. Provision of informed consent prior to any study specific procedures 4.2.2 Myocardial infarction Exclusion Criteria Subjects should not enter the study if any of the following criteria are fulfilled Inability or unwilling to give informed consent. Unable to tolerate the supine position Impaired renal function with eGFR of <30 mL/min/1.73m2 Allergy to iodinated contrast Severe or significant comorbidity Women who are pregnant or breastfeeding 4.3 Stable CAD inclusion/exclusion criteria 4.3.1 Stable CAD inclusion criteria Male or females over the age of 40 with stable coronary artery disease who have undergone a recent (<30 days) coronary angiogram + PCI Provision of informed consent prior to any study specific procedures 4.3.2 Stable coronary disease exclusion criteria Myocardial infarction less than 3 months ago Inability or unwilling to give informed consent. Unable to tolerate the supine position Allergy to iodinated contrast Impaired renal function with eGFR of <30 mL/min/1.73m2 Severe or significant comorbidity Women who are pregnant or breastfeeding 4.4 Bioprosthetic heart valve inclusion/exclusion criteria 4.4.1 Bioprosthetic aortic valve inclusion criteria Ability to give informed consent Males or females over 40 years of age with recent (up to 6±4 weeks) surgical bioprosthetic heart valve replacement (SAVR or SMVR) or transcatheter bioprosthetic heart valve insertion (TAVI or TMVR). 4.4.2 Bioprosthetic heart valve exclusion criteria Inability to give informed consent Pregnancy Breastfeeding Claustrophobia Allergy to iodinated contrast Liver failure Chronic kidney disease (with estimated glomerular filtration rate <30 mL/min) Paget's disease Metastatic malignancy Inability to tolerate the supine position Women who are pregnant or breastfeeding 4.5 DVT/PE inclusion/exclusion criteria 4.5.1 DVT/PE inclusion criteria Male or females over the age of 40 with recently confirmed (<30 days) DVT on ultrasound or PE on CTPA as per ESC diagnostic guidelines (22), or with suspected DVT or PE in the context of confirmed COVID-19 requiring hospital admission Provision of informed consent prior to any study specific procedures 4.5.2 DVT/PE exclusion criteria Inability or unwilling to give informed consent. Unable to tolerate the supine position Impaired renal function with eGFR of <30 mL/min/1.73m2 Allergy to iodinated contrast Contraindication to iodinated contrast agents Severe of significant comorbidity Women who are pregnant or breastfeeding Contra-indication to Magnetic Resonance imaging in the 6 patients offered PET MR scanning. 4.6 Stroke and TIA inclusion/exclusion criteria 4.6.1 Stroke and TIA inclusion criteria Male or females over the age of 40 with recently diagnosed stroke or TIA as per diagnostic criteria of the American Heart and Stroke Association guidelines (23), with or without COVID-19. Provision of informed consent prior to any study specific procedures 4.6.2 Stroke and TIA exclusion criteria Inability or unwilling to give informed consent. Unable to tolerate the supine position Impaired renal function with eGFR of <30 mL/min/1.73m2 Allergy to iodinated contrast Contraindication to iodinated contrast agents Severe of significant comorbidity Women who are pregnant or breastfeeding
Facility Information:
Facility Name
University of Edinburgh
City
Edinburgh
Country
United Kingdom

12. IPD Sharing Statement

Plan to Share IPD
Undecided
Citations:
PubMed Identifier
27126645
Citation
Wendelboe AM, Raskob GE. Global Burden of Thrombosis: Epidemiologic Aspects. Circ Res. 2016 Apr 29;118(9):1340-7. doi: 10.1161/CIRCRESAHA.115.306841.
Results Reference
background
Citation
Organisation WH. Cardiovascular diseases 2018 [Available from: www.who.int/cardiovascular_diseases/en/
Results Reference
background
PubMed Identifier
21414532
Citation
Silvain J, Collet JP, Nagaswami C, Beygui F, Edmondson KE, Bellemain-Appaix A, Cayla G, Pena A, Brugier D, Barthelemy O, Montalescot G, Weisel JW. Composition of coronary thrombus in acute myocardial infarction. J Am Coll Cardiol. 2011 Mar 22;57(12):1359-67. doi: 10.1016/j.jacc.2010.09.077.
Results Reference
background
PubMed Identifier
11257081
Citation
Puvimanasinghe JP, Steyerberg EW, Takkenberg JJ, Eijkemans MJ, van Herwerden LA, Bogers AJ, Habbema JD. Prognosis after aortic valve replacement with a bioprosthesis: predictions based on meta-analysis and microsimulation. Circulation. 2001 Mar 20;103(11):1535-41. doi: 10.1161/01.cir.103.11.1535.
Results Reference
background
PubMed Identifier
7897124
Citation
Heras M, Chesebro JH, Fuster V, Penny WJ, Grill DE, Bailey KR, Danielson GK, Orszulak TA, Pluth JR, Puga FJ, et al. High risk of thromboemboli early after bioprosthetic cardiac valve replacement. J Am Coll Cardiol. 1995 Apr;25(5):1111-9. doi: 10.1016/0735-1097(94)00563-6.
Results Reference
background
PubMed Identifier
27436602
Citation
Van Mieghem NM, van Gils L, Ahmad H, van Kesteren F, van der Werf HW, Brueren G, Storm M, Lenzen M, Daemen J, van den Heuvel AF, Tonino P, Baan J, Koudstaal PJ, Schipper ME, van der Lugt A, de Jaegere PP. Filter-based cerebral embolic protection with transcatheter aortic valve implantation: the randomised MISTRAL-C trial. EuroIntervention. 2016 Jul 20;12(4):499-507. doi: 10.4244/EIJV12I4A84.
Results Reference
background
PubMed Identifier
22921973
Citation
Brennan JM, Edwards FH, Zhao Y, O'Brien S, Booth ME, Dokholyan RS, Douglas PS, Peterson ED; DEcIDE AVR Research Team. Early anticoagulation of bioprosthetic aortic valves in older patients: results from the Society of Thoracic Surgeons Adult Cardiac Surgery National Database. J Am Coll Cardiol. 2012 Sep 11;60(11):971-7. doi: 10.1016/j.jacc.2012.05.029. Epub 2012 Aug 22.
Results Reference
background
PubMed Identifier
26780736
Citation
Heit JA, Spencer FA, White RH. The epidemiology of venous thromboembolism. J Thromb Thrombolysis. 2016 Jan;41(1):3-14. doi: 10.1007/s11239-015-1311-6.
Results Reference
background
PubMed Identifier
4138834
Citation
Sevitt S. The structure and growth of valve-pocket thrombi in femoral veins. J Clin Pathol. 1974 Jul;27(7):517-28. doi: 10.1136/jcp.27.7.517.
Results Reference
background
PubMed Identifier
22837532
Citation
Darbousset R, Thomas GM, Mezouar S, Frere C, Bonier R, Mackman N, Renne T, Dignat-George F, Dubois C, Panicot-Dubois L. Tissue factor-positive neutrophils bind to injured endothelial wall and initiate thrombus formation. Blood. 2012 Sep 6;120(10):2133-43. doi: 10.1182/blood-2012-06-437772. Epub 2012 Jul 26.
Results Reference
background
PubMed Identifier
29310137
Citation
Wells PS, Ihaddadene R, Reilly A, Forgie MA. Diagnosis of Venous Thromboembolism: 20 Years of Progress. Ann Intern Med. 2018 Jan 16;168(2):131-140. doi: 10.7326/M17-0291. Epub 2018 Jan 9.
Results Reference
background
PubMed Identifier
24449944
Citation
Feigin VL, Forouzanfar MH, Krishnamurthi R, Mensah GA, Connor M, Bennett DA, Moran AE, Sacco RL, Anderson L, Truelsen T, O'Donnell M, Venketasubramanian N, Barker-Collo S, Lawes CM, Wang W, Shinohara Y, Witt E, Ezzati M, Naghavi M, Murray C; Global Burden of Diseases, Injuries, and Risk Factors Study 2010 (GBD 2010) and the GBD Stroke Experts Group. Global and regional burden of stroke during 1990-2010: findings from the Global Burden of Disease Study 2010. Lancet. 2014 Jan 18;383(9913):245-54. doi: 10.1016/s0140-6736(13)61953-4. Erratum In: Lancet. 2014 Jan 18;383(9913):218.
Results Reference
background
PubMed Identifier
24339566
Citation
Singh P, Kaur R, Kaur A. Clot composition and treatment approach to acute ischemic stroke: The road so far. Ann Indian Acad Neurol. 2013 Oct;16(4):494-7. doi: 10.4103/0972-2327.120433.
Results Reference
background
PubMed Identifier
19935740
Citation
Dobrucki LW, Sinusas AJ. PET and SPECT in cardiovascular molecular imaging. Nat Rev Cardiol. 2010 Jan;7(1):38-47. doi: 10.1038/nrcardio.2009.201. Epub 2009 Nov 24.
Results Reference
background
PubMed Identifier
10974186
Citation
Sabatine MS, Jang IK. The use of glycoprotein IIb/IIIa inhibitors in patients with coronary artery disease. Am J Med. 2000 Aug 15;109(3):224-37. doi: 10.1016/s0002-9343(00)00474-5.
Results Reference
background
PubMed Identifier
21852609
Citation
Siebler M, Hennerici MG, Schneider D, von Reutern GM, Seitz RJ, Rother J, Witte OW, Hamann G, Junghans U, Villringer A, Fiebach JB. Safety of Tirofiban in acute Ischemic Stroke: the SaTIS trial. Stroke. 2011 Sep;42(9):2388-92. doi: 10.1161/STROKEAHA.110.599662. Epub 2011 Aug 18.
Results Reference
background
PubMed Identifier
10605738
Citation
Nurden AT. Inherited abnormalities of platelets. Thromb Haemost. 1999 Aug;82(2):468-80. No abstract available.
Results Reference
background
PubMed Identifier
28302764
Citation
Lohrke J, Siebeneicher H, Berger M, Reinhardt M, Berndt M, Mueller A, Zerna M, Koglin N, Oden F, Bauser M, Friebe M, Dinkelborg LM, Huetter J, Stephens AW. 18F-GP1, a Novel PET Tracer Designed for High-Sensitivity, Low-Background Detection of Thrombi. J Nucl Med. 2017 Jul;58(7):1094-1099. doi: 10.2967/jnumed.116.188896. Epub 2017 Mar 16.
Results Reference
background
PubMed Identifier
24224999
Citation
Joshi NV, Vesey AT, Williams MC, Shah AS, Calvert PA, Craighead FH, Yeoh SE, Wallace W, Salter D, Fletcher AM, van Beek EJ, Flapan AD, Uren NG, Behan MW, Cruden NL, Mills NL, Fox KA, Rudd JH, Dweck MR, Newby DE. 18F-fluoride positron emission tomography for identification of ruptured and high-risk coronary atherosclerotic plaques: a prospective clinical trial. Lancet. 2014 Feb 22;383(9918):705-13. doi: 10.1016/S0140-6736(13)61754-7. Epub 2013 Nov 11.
Results Reference
background
PubMed Identifier
22516444
Citation
Dweck MR, Chow MW, Joshi NV, Williams MC, Jones C, Fletcher AM, Richardson H, White A, McKillop G, van Beek EJ, Boon NA, Rudd JH, Newby DE. Coronary arterial 18F-sodium fluoride uptake: a novel marker of plaque biology. J Am Coll Cardiol. 2012 Apr 24;59(17):1539-48. doi: 10.1016/j.jacc.2011.12.037.
Results Reference
background
PubMed Identifier
25689940
Citation
Thygesen K, Alpert JS, Jaffe AS, Simoons ML, Chaitman BR, White HD; Writing Group on behalf of the Joint ESC/ACCF/AHA/WHF Task Force for the Universal Definition of Myocardial Infarction. Third universal definition of myocardial infarction. Glob Heart. 2012 Dec;7(4):275-95. doi: 10.1016/j.gheart.2012.08.001. Epub 2012 Sep 26. No abstract available.
Results Reference
background
PubMed Identifier
25173341
Citation
Konstantinides SV, Torbicki A, Agnelli G, Danchin N, Fitzmaurice D, Galie N, Gibbs JS, Huisman MV, Humbert M, Kucher N, Lang I, Lankeit M, Lekakis J, Maack C, Mayer E, Meneveau N, Perrier A, Pruszczyk P, Rasmussen LH, Schindler TH, Svitil P, Vonk Noordegraaf A, Zamorano JL, Zompatori M; Task Force for the Diagnosis and Management of Acute Pulmonary Embolism of the European Society of Cardiology (ESC). 2014 ESC guidelines on the diagnosis and management of acute pulmonary embolism. Eur Heart J. 2014 Nov 14;35(43):3033-69, 3069a-3069k. doi: 10.1093/eurheartj/ehu283. Epub 2014 Aug 29. No abstract available. Erratum In: Eur Heart J. 2015 Oct 14;36(39):2666. Eur Heart J. 2015 Oct 14;36(39):2642.
Results Reference
background
PubMed Identifier
23652265
Citation
Sacco RL, Kasner SE, Broderick JP, Caplan LR, Connors JJ, Culebras A, Elkind MS, George MG, Hamdan AD, Higashida RT, Hoh BL, Janis LS, Kase CS, Kleindorfer DO, Lee JM, Moseley ME, Peterson ED, Turan TN, Valderrama AL, Vinters HV; American Heart Association Stroke Council, Council on Cardiovascular Surgery and Anesthesia; Council on Cardiovascular Radiology and Intervention; Council on Cardiovascular and Stroke Nursing; Council on Epidemiology and Prevention; Council on Peripheral Vascular Disease; Council on Nutrition, Physical Activity and Metabolism. An updated definition of stroke for the 21st century: a statement for healthcare professionals from the American Heart Association/American Stroke Association. Stroke. 2013 Jul;44(7):2064-89. doi: 10.1161/STR.0b013e318296aeca. Epub 2013 May 7. Erratum In: Stroke. 2019 Aug;50(8):e239.
Results Reference
background
PubMed Identifier
17635892
Citation
Einstein AJ, Henzlova MJ, Rajagopalan S. Estimating risk of cancer associated with radiation exposure from 64-slice computed tomography coronary angiography. JAMA. 2007 Jul 18;298(3):317-23. doi: 10.1001/jama.298.3.317.
Results Reference
background
PubMed Identifier
17035872
Citation
Barrett BJ, Katzberg RW, Thomsen HS, Chen N, Sahani D, Soulez G, Heiken JP, Lepanto L, Ni ZH, Ni ZH, Nelson R. Contrast-induced nephropathy in patients with chronic kidney disease undergoing computed tomography: a double-blind comparison of iodixanol and iopamidol. Invest Radiol. 2006 Nov;41(11):815-21. doi: 10.1097/01.rli.0000242807.01818.24. Erratum In: Invest Radiol. 2007 Feb;42(2):94. Ni, Zhao-hui [added].
Results Reference
background
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In-vivo Thrombus Imaging With 18F-GP1, a Novel Platelet PET Radiotracer

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