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  1. Article ; Online: Mechanical thrombectomy for acute ischemic stroke revealing a cardiac myxoma: histological and immunohistochemical study to determine myxomatous emboli.

    Vantyghem, Soetkin / Staessens, Senna / Francois, Olivier / De Meyer, Simon F / Vanacker, Peter

    Acta neurologica Belgica

    2023  Volume 123, Issue 3, Page(s) 1201–1203

    MeSH term(s) Humans ; Ischemic Stroke/complications ; Ischemic Stroke/diagnostic imaging ; Stroke/complications ; Stroke/diagnostic imaging ; Brain Ischemia/complications ; Brain Ischemia/diagnostic imaging ; Thrombectomy ; Myxoma/complications ; Myxoma/diagnostic imaging ; Myxoma/pathology ; Tissue Plasminogen Activator ; Treatment Outcome
    Chemical Substances Tissue Plasminogen Activator (EC 3.4.21.68)
    Language English
    Publishing date 2023-04-11
    Publishing country Italy
    Document type Letter
    ZDB-ID 127315-2
    ISSN 2240-2993 ; 0300-9009
    ISSN (online) 2240-2993
    ISSN 0300-9009
    DOI 10.1007/s13760-023-02254-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Thrombus heterogeneity in ischemic stroke.

    Staessens, Senna / De Meyer, Simon F

    Platelets

    2020  Volume 32, Issue 3, Page(s) 331–339

    Abstract: The structure of stroke thrombi has gained an increasing amount of interest in recent years. The advent of endovascular thrombectomy has offered the unique opportunity to provide and analyze thrombi removed from ischemic stroke patients. It has become ... ...

    Abstract The structure of stroke thrombi has gained an increasing amount of interest in recent years. The advent of endovascular thrombectomy has offered the unique opportunity to provide and analyze thrombi removed from ischemic stroke patients. It has become clear that the composition of ischemic stroke thrombi is relatively heterogenous and various molecular and cellular patterns become apparent. Good understanding of the histopathologic characteristics of thrombi is important to lead future advancements in acute ischemic stroke treatment. In this review, we give a brief overview of the main stroke thrombus components that have been recently characterized in this rapidly evolving field. We also summarize how thrombus heterogeneity can affect stroke treatment.
    MeSH term(s) Female ; Genetic Heterogeneity ; Humans ; Ischemic Stroke/complications ; Ischemic Stroke/genetics ; Ischemic Stroke/pathology ; Male ; Thrombectomy/methods ; Thrombosis/genetics
    Language English
    Publishing date 2020-04-20
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 1034283-7
    ISSN 1369-1635 ; 0953-7104
    ISSN (online) 1369-1635
    ISSN 0953-7104
    DOI 10.1080/09537104.2020.1748586
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: R-tPA Resistance Is Specific for Platelet-Rich Stroke Thrombi and Can Be Overcome by Targeting Nonfibrin Components.

    Vandelanotte, Sarah / François, Olivier / Desender, Linda / Staessens, Senna / Vanhoorne, Alexander / Van Gool, Fréderick / Tersteeg, Claudia / Vanhoorelbeke, Karen / Vanacker, Peter / Andersson, Tommy / De Meyer, Simon F

    Stroke

    2024  Volume 55, Issue 5, Page(s) 1181–1190

    Abstract: Background: Resistance to r-tPA (recombinant tissue-type plasminogen activator) is a well-known but poorly understood phenomenon that hampers successful recanalization in patients with acute ischemic stroke. Using clinically relevant thrombi from ... ...

    Abstract Background: Resistance to r-tPA (recombinant tissue-type plasminogen activator) is a well-known but poorly understood phenomenon that hampers successful recanalization in patients with acute ischemic stroke. Using clinically relevant thrombi from patients with acute ischemic stroke, we investigated if and how thrombus composition impacts r-tPA-mediated lysis. In addition, we explored strategies to overcome r-tPA resistance.
    Methods: Thrombi were split into 2 parts, 1 of which was used for thrombolysis and the other for detailed histological analysis. Thrombolysis was performed in normal human plasma using r-tPA alone, using r-tPA in combination with DNase-1 or using r-tPA in combination with N,N'-diacetyl-l-cystine. Thrombus lysis was calculated as the percentage of residual thrombus weight compared with its initial weight and the degree of lysis was linked to thrombus composition determined via histology.
    Results: Interestingly, we found that the efficacy of r-tPA-mediated thrombolysis was strongly correlated with the composition of the thrombi. Thrombi containing high amounts of red blood cells and low amounts of DNA and von Willebrand Factor were efficiently degraded by r-tPA, whereas thrombi containing low amounts of red blood cells and higher amounts of DNA and von Willebrand Factor were resistant to r-tPA. Importantly, combination of r-tPA with DNase-1 or N,N'-diacetyl-l-cystine significantly and specifically improved the lysis of these r-tPA-resistant thrombi.
    Conclusions: Using patient thrombus material, our results for the first time show that the composition of stroke thrombi largely determines their susceptibility to r-tPA-mediated thrombolysis. Red blood cell-poor thrombi have a specific resistance to r-tPA, which can be overcome by targeting nonfibrin components using DNase-1 or N,N'-diacetyl-l-cystine.
    Language English
    Publishing date 2024-03-25
    Publishing country United States
    Document type Journal Article
    ZDB-ID 80381-9
    ISSN 1524-4628 ; 0039-2499 ; 0749-7954
    ISSN (online) 1524-4628
    ISSN 0039-2499 ; 0749-7954
    DOI 10.1161/STROKEAHA.123.045880
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Detailed histological analysis of a thrombectomy-resistant ischemic stroke thrombus: a case report.

    Staessens, Senna / François, Olivier / Desender, Linda / Vanacker, Peter / Dewaele, Tom / Sciot, Raf / Vanhoorelbeke, Karen / Andersson, Tommy / De Meyer, Simon F

    Thrombosis journal

    2021  Volume 19, Issue 1, Page(s) 11

    Abstract: Background: Mechanical removal of a thrombus by thrombectomy can be quite challenging. For reasons that are not fully understood, some thrombi require multiple passes to achieve successful recanalization, whereas other thrombi are efficiently removed in ...

    Abstract Background: Mechanical removal of a thrombus by thrombectomy can be quite challenging. For reasons that are not fully understood, some thrombi require multiple passes to achieve successful recanalization, whereas other thrombi are efficiently removed in a single pass. Since first pass success is associated with better clinical outcome, it is important to better understand the nature of thrombectomy resistant thrombi. The aim of this study was therefore to characterize the cellular and molecular composition of a thrombus that was very hard to retrieve via mechanical thrombectomy.
    Case presentation: In a patient that was admitted with a right middle cerebral artery M1-occlusion, 11 attempts using various thrombectomy devices and techniques were required for removal of the thrombus. This peculiar case provided a rare opportunity to perform an in-depth histopathological study of a difficult to retrieve thrombus. Thrombus material was histologically analyzed using hematoxylin and eosin, Martius Scarlet Blue stain (red blood cells and fibrin), Feulgen stain (DNA), von Kossa stain (calcifications) and immunohistochemical analysis of von Willebrand factor, platelets, leukocytes and neutrophil extracellular traps. Histological analysis revealed abnormally high amounts of extracellular DNA, leukocytes, von Willebrand factor and calcifications. Extracellular DNA stained positive for markers of leukocytes and NETs, suggesting that a significant portion of DNA is derived from neutrophil extracellular traps.
    Conclusion: In this unique case of a nearly thrombectomy-resistant stroke thrombus, our study showed an atypical composition compared to the common structural features found in ischemic stroke thrombi. The core of the retrieved thrombus consisted of extracellular DNA that colocalized with von Willebrand factor and microcalcifications. These results support the hypothesis that von Willebrand factor, neutrophil extracellular traps and microcalcifications contribute to mechanical thrombectomy resistance. Such information is important to identify novel targets in order to optimize technical treatment protocols and techniques to increase first pass success rates.
    Language English
    Publishing date 2021-02-22
    Publishing country England
    Document type Journal Article
    ISSN 1477-9560
    ISSN 1477-9560
    DOI 10.1186/s12959-021-00262-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Studying Stroke Thrombus Composition After Thrombectomy: What Can We Learn?

    Staessens, Senna / François, Olivier / Brinjikji, Waleed / Doyle, Karen M / Vanacker, Peter / Andersson, Tommy / De Meyer, Simon F

    Stroke

    2021  Volume 52, Issue 11, Page(s) 3718–3727

    Abstract: The composition of ischemic stroke thrombi has gained an increasing amount of interest in recent years. The implementation of endovascular procedures in standard stroke care has granted researchers the unique opportunity to examine patient thrombus ... ...

    Abstract The composition of ischemic stroke thrombi has gained an increasing amount of interest in recent years. The implementation of endovascular procedures in standard stroke care has granted researchers the unique opportunity to examine patient thrombus material. Increasing evidence indicates that stroke thrombi are complex and heterogenous, consisting of various biochemical (eg, fibrin, von Willebrand Factor, and neutrophil extracellular traps) and cellular (eg, red blood cells, platelets, leukocytes, and bacteria) components. This complex composition may explain therapeutic limitations and also offer novel insights in several aspects of stroke management. Better understanding of thrombus characteristics could, therefore, potentially lead to improvements in the management of patients with stroke. In this review, we provide a comprehensive overview of the lessons learned by examining stroke thrombus composition after endovascular thrombectomy and its potential relevance for thrombectomy success rates, thrombolysis, clinical outcomes, stroke etiology, and radiological imaging.
    MeSH term(s) Humans ; Ischemic Stroke ; Thrombectomy ; Thrombosis
    Language English
    Publishing date 2021-09-14
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 80381-9
    ISSN 1524-4628 ; 0039-2499 ; 0749-7954
    ISSN (online) 1524-4628
    ISSN 0039-2499 ; 0749-7954
    DOI 10.1161/STROKEAHA.121.034289
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Unusual Histopathological Findings in Mechanically Removed Stroke Thrombi - A Multicenter Experience.

    Aspegren, Oskar / Staessens, Senna / Vandelanotte, Sarah / Desender, Linda / Cordonnier, Charlotte / Puy, Laurent / Bricout, Nicolas / De Meyer, Simon F / Andersson, Tommy / Arnberg, Fabian

    Frontiers in neurology

    2022  Volume 13, Page(s) 846293

    Abstract: Background: Several studies have investigated the histopathology of mechanically retrieved thrombi from stroke patients. Thrombi with unusual components constitute about 1-2% of all stroke thrombi in clinical practice. Knowledge about these rare ... ...

    Abstract Background: Several studies have investigated the histopathology of mechanically retrieved thrombi from stroke patients. Thrombi with unusual components constitute about 1-2% of all stroke thrombi in clinical practice. Knowledge about these rare components is limited.
    Objectives: To characterize the histopathology of unusual stroke thrombi from a real-world setting with relation to clinical presentation, patient characteristics and procedural aspects of mechanical thrombectomy.
    Methods: One-thousand and eight thrombi retrieved from stroke patients with mechanical thrombectomy at three different hospitals were retrospectively reviewed for unusual histological components. Fifteen thrombi were included in the study for further histopathological analysis. Clinical data and data on procedural aspects were collected.
    Results: We identified six cases with large amounts of extracellular DNA, of which three were calcified. All six cases except one received anticoagulant therapy. We describe two types of calcifications that differ with respect to general calcification morphology, von Kossa staining pattern, macrophage immunophenotype and presence of multinucleated giant cells. Cholesterol-rich (
    Conclusion: In our retrospective multicenter study, we characterized stroke thrombi histopathologically and found subgroups of thrombi defined by presence of rarely seen components. These defined subgroups showed relation to underlying cardiovascular disease, patient characteristics, and mechanical thrombectomy technique. Knowledge about these components may increase our understanding of stroke pathophysiology and influence interventional procedures.
    Language English
    Publishing date 2022-05-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2564214-5
    ISSN 1664-2295
    ISSN 1664-2295
    DOI 10.3389/fneur.2022.846293
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  7. Article ; Online: Identifying ex vivo acute ischemic stroke thrombus composition using electrochemical impedance spectroscopy.

    Darcourt, Jean / Brinjikji, Waleed / François, Olivier / Giraud, Alice / Johnson, Collin R / Patil, Smita / Staessens, Senna / Kadirvel, Ramanathan / Mohammaden, Mahmoud H / Pisani, Leonardo / Rodrigues, Gabriel Martins / Cancelliere, Nicole M / Pereira, Vitor Mendes / Bozsak, Franz / Doyle, Karen / De Meyer, Simon F / Messina, Pierluca / Kallmes, David / Cognard, Christophe /
    Nogueira, Raul G

    Interventional neuroradiology : journal of peritherapeutic neuroradiology, surgical procedures and related neurosciences

    2023  , Page(s) 15910199231175377

    Abstract: Background: Intra-procedural characterization of stroke thromboemboli might guide mechanical thrombectomy (MT) device choice to improve recanalization rates. Electrochemical impedance spectroscopy (EIS) has been used to characterize various biological ... ...

    Abstract Background: Intra-procedural characterization of stroke thromboemboli might guide mechanical thrombectomy (MT) device choice to improve recanalization rates. Electrochemical impedance spectroscopy (EIS) has been used to characterize various biological tissues in real time but has not been used in thrombus.
    Objective: To perform a feasibility study of EIS analysis of thrombi retrieved by MT to evaluate: (1) the ability of EIS and machine learning to predict red blood cell (RBC) percentage content of thrombi and (2) to classify the thrombi as "RBC-rich" or "RBC-poor" based on a range of cutoff values of RBC.
    Methods: ClotbasePilot was a multicentric, international, prospective feasibility study. Retrieved thrombi underwent histological analysis to identify proportions of RBC and other components. EIS results were analyzed with machine learning. Linear regression was used to evaluate the correlation between the histology and EIS. Sensitivity and specificity of the model to classify the thrombus as RBC-rich or RBC-poor were also evaluated.
    Results: Among 514 MT,179 thrombi were included for EIS and histological analysis. The mean composition in RBC of the thrombi was 36% ± 24. Good correlation between the impedance-based prediction and histology was achieved (slope of 0.9,
    Conclusion: Combination of EIS and machine learning can reliably predict the RBC composition of retrieved ex vivo AIS thrombi and then classify them into groups according to their RBC composition with good sensitivity and specificity.
    Language English
    Publishing date 2023-05-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1354913-3
    ISSN 2385-2011 ; 1591-0199 ; 1123-9344
    ISSN (online) 2385-2011
    ISSN 1591-0199 ; 1123-9344
    DOI 10.1177/15910199231175377
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  8. Article ; Online: Structural analysis of ischemic stroke thrombi: histological indications for therapy resistance.

    Staessens, Senna / Denorme, Frederik / Francois, Olivier / Desender, Linda / Dewaele, Tom / Vanacker, Peter / Deckmyn, Hans / Vanhoorelbeke, Karen / Andersson, Tommy / De Meyer, Simon F

    Haematologica

    2020  Volume 105, Issue 2, Page(s) 498–507

    Abstract: Ischemic stroke is caused by a thromboembolic occlusion of cerebral arteries. Treatment is focused on fast and efficient removal of the occluding thrombus, ... ...

    Abstract Ischemic stroke is caused by a thromboembolic occlusion of cerebral arteries. Treatment is focused on fast and efficient removal of the occluding thrombus, either
    MeSH term(s) Brain Ischemia/therapy ; Humans ; Ischemic Stroke ; Stroke/therapy ; Thrombectomy ; Thrombosis/etiology ; Thrombosis/therapy
    Language English
    Publishing date 2020-01-31
    Publishing country Italy
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2333-4
    ISSN 1592-8721 ; 0017-6567 ; 0390-6078
    ISSN (online) 1592-8721
    ISSN 0017-6567 ; 0390-6078
    DOI 10.3324/haematol.2019.219881
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  9. Article ; Online: Thrombus formation during ECMO: Insights from a detailed histological analysis of thrombus composition.

    Staessens, Senna / Moussa, Mouhamed D / Pierache, Adeline / Rauch, Antoine / Rousse, Natacha / Boulleaux, Eric / Ung, Alexandre / Desender, Linda / Pradines, Bénédicte / Vincentelli, André / Mercier, Olaf / Labreuche, Julien / Duhamel, Alain / Van Belle, Eric / Vincent, Flavien / Dupont, Annabelle / Vanhoorelbeke, Karen / Corseaux, Delphine / De Meyer, Simon F /
    Susen, Sophie

    Journal of thrombosis and haemostasis : JTH

    2022  Volume 20, Issue 9, Page(s) 2058–2069

    Abstract: Objectives: Intra-device thrombosis remains one of the most common complications during extracorporeal membrane oxygenation (ECMO). Despite anticoagulation, approximately 35% of patients develop thrombi in the membrane oxygenator, pump heads, or tubing. ...

    Abstract Objectives: Intra-device thrombosis remains one of the most common complications during extracorporeal membrane oxygenation (ECMO). Despite anticoagulation, approximately 35% of patients develop thrombi in the membrane oxygenator, pump heads, or tubing. The aim of this study was to describe the molecular and cellular features of ECMO thrombi and to study the main drivers of thrombus formation at different sites in the ECMO circuits.
    Approach and results: Thrombi (n = 85) were collected immediately after veno-arterial-(VA)-ECMO circuit removal from 25 patients: 23 thrombi from the pump, 25 from the oxygenator, and 37 from the tubing. Quantitative histological analysis was performed for the amount of red blood cells (RBCs), platelets, fibrin, von Willebrand factor (VWF), leukocytes, and citrullinated histone H3 (H3Cit). ECMO thrombi consist of a heterogenous composition with fibrin and VWF being the major thrombus components. A clustering analysis of the four major histological parameters identified two typical thrombus types: RBC-rich and RBC-poor/fibrin-rich thrombi with no significant differences in VWF and platelet content. Thrombus composition was not associated with the thrombus location, except for higher amounts of H3Cit that were found in pump and oxygenator thrombi compared to tubing samples. We observed higher blood leukocyte count and lactate dehydrogenase levels in patients with fibrin-rich thrombi.
    Conclusion: We found that thrombus composition is heterogenous, independent of their location, consisting of two types: RBC-rich and a fibrin-rich types. We also found that NETs play a minor role. These findings are important to improve current anticoagulation strategies in ECMO.
    MeSH term(s) Anticoagulants ; Extracorporeal Membrane Oxygenation/adverse effects ; Fibrin/analysis ; Humans ; Thrombosis ; von Willebrand Factor
    Chemical Substances Anticoagulants ; von Willebrand Factor ; Fibrin (9001-31-4)
    Language English
    Publishing date 2022-07-03
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2112661-6
    ISSN 1538-7836 ; 1538-7933
    ISSN (online) 1538-7836
    ISSN 1538-7933
    DOI 10.1111/jth.15784
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  10. Article ; Online: Vascular Endothelial Damage in the Pathogenesis of Organ Injury in Severe COVID-19.

    Dupont, Annabelle / Rauch, Antoine / Staessens, Senna / Moussa, Mouhamed / Rosa, Mickael / Corseaux, Delphine / Jeanpierre, Emmanuelle / Goutay, Julien / Caplan, Morgan / Varlet, Pauline / Lefevre, Guillaume / Lassalle, Fanny / Bauters, Anne / Faure, Karine / Lambert, Marc / Duhamel, Alain / Labreuche, Julien / Garrigue, Delphine / De Meyer, Simon F /
    Staels, Bart / Vincent, Flavien / Rousse, Natacha / Kipnis, Eric / Lenting, Peter / Poissy, Julien / Susen, Sophie

    Arteriosclerosis, thrombosis, and vascular biology

    2021  Volume 41, Issue 5, Page(s) 1760–1773

    Abstract: Figure: see text]. ...

    Abstract [Figure: see text].
    MeSH term(s) Biomarkers/blood ; COVID-19/complications ; COVID-19/immunology ; COVID-19/pathology ; Complement Activation ; Critical Care ; Cytokines/blood ; Endothelium, Vascular/pathology ; Female ; Humans ; Liver Failure, Acute/virology ; Male ; Microcirculation ; Middle Aged ; Multiple Organ Failure/virology ; Nucleosomes/metabolism ; Respiratory Insufficiency/virology ; SARS-CoV-2 ; Thrombosis/virology
    Chemical Substances Biomarkers ; Cytokines ; Nucleosomes
    Language English
    Publishing date 2021-02-25
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1221433-4
    ISSN 1524-4636 ; 1079-5642
    ISSN (online) 1524-4636
    ISSN 1079-5642
    DOI 10.1161/ATVBAHA.120.315595
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