The Latest Clinical Advances in Thrombocytopenia

A special issue of Journal of Clinical Medicine (ISSN 2077-0383). This special issue belongs to the section "Hematology".

Deadline for manuscript submissions: closed (31 January 2021) | Viewed by 112731

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Special Issue Editors


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Guest Editor
Laboratory for Clinical Thrombosis and Hemostasis, Department of Internal Medicine, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Center, NL-6200 Maastricht, The Netherlands
Interests: vascular medicine; thrombosis; coagulation; atherothrombosis; DIC

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Guest Editor
1. Emeritus Professor and Director, Department of Hematology and Central Hematology Laboratory, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
2. Senior Professor, Center for Thrombosis and Hemostasis, University Medical Center Mainz, Johannes Gutenberg University, Mainz, Germany
3. Visiting Professor, Haemostasis Research Unit, University College London, London, UK
Interests: Thrombotic thrombocytopenic purpura; thrombotic microangiopathies; ADAMTS13; Hemostasis disorders; thrombotic disorders; Hematology

Special Issue Information

Dear Colleagues,

Platelets are critical elements in the blood stream, supporting hemostasis as well as performing even more complex tasks within networks of biological (immunity) and pathophysiological processes, such as cancer and ischemia/reperfusion injury. Changes in the number (and function) of platelets may have a substantial impact on any of these processes. The “simple” finding of a reduced platelet count (thrombocytopenia) has a history (origin) and a consequence (e.g., bleeding). The origin of thrombocytopenia can be unclear (idiopathic), can depend on associated illness (e.g., DIC, HIT, TTP) with a different etiology depending on the illness (related to production, clustering, immune depletion, etc.), and can also be acquired (e.g., during extracorporeal circuits, such as “ECMO”). Currently, the COVID-19 pandemic is also characterized by a reduced platelet count, although it is less severe than in other diseases, and the overall patient phenotype seems thrombotic rather than hemorrhagic as in other virus infections, such as dengue. Thus, there many possible causes for thrombocytopenia, and these are, quite often, poorly characterized. Because the clinical question is always whether or not the platelet deficit has consequences for the patient, it is important and timely as well (e.g., COVID-19) to discuss this topic in a Special Issue.

Based on your expertise, we ask you to contribute an article to this Special Issue.

Prof. Dr. Hugo ten Cate
Prof. Dr. Bernhard Lämmle
Guest Editors

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Keywords

  • thrombocytopenia
  • platelet function
  • thrombosis
  • bleeding
  • malignancy
  • virus
  • DIC
  • TTP
  • HIT
  • extracorporeal circulation

Published Papers (15 papers)

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Editorial

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5 pages, 198 KiB  
Editorial
Special Issue: “The Latest Clinical Advances in Thrombocytopenia”
by Hugo ten Cate and Bernhard Lämmle
J. Clin. Med. 2021, 10(16), 3463; https://doi.org/10.3390/jcm10163463 - 05 Aug 2021
Viewed by 1865
Abstract
Platelets are critical elements in the blood stream, supporting hemostasis as well as performing even more complex tasks within networks of biological (immunity) and pathophysiological processes, such as cancer and ischemia/reperfusion injury [...] Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)

Research

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14 pages, 1561 KiB  
Article
Influence of Personality, Resilience and Life Conditions on Depression and Anxiety in 104 Patients Having Survived Acute Autoimmune Thrombotic Thrombocytopenic Purpura
by Tanja Falter, Sibylle Böschen, Markus Schepers, Manfred Beutel, Karl Lackner, Inge Scharrer and Bernhard Lämmle
J. Clin. Med. 2021, 10(2), 365; https://doi.org/10.3390/jcm10020365 - 19 Jan 2021
Cited by 7 | Viewed by 2406
Abstract
Autoimmune thrombotic thrombocytopenic purpura (iTTP) is a life-threatening, relapsing disease in which an acquired deficiency of the enzyme ADAMTS13 leads to generalised microvascular thrombosis. Survivors have a high prevalence of depression and impaired cognitive function. The aim of this study was to determine [...] Read more.
Autoimmune thrombotic thrombocytopenic purpura (iTTP) is a life-threatening, relapsing disease in which an acquired deficiency of the enzyme ADAMTS13 leads to generalised microvascular thrombosis. Survivors have a high prevalence of depression and impaired cognitive function. The aim of this study was to determine whether life circumstances and personality have an influence on the development and severity of depression and anxiety in iTTP patients and how they impact the quality of life. With validated questionnaires, we examined the prevalence of depression and anxiety symptoms in 104 iTTP patients, as well as parameters of subjective cognitive deficits, quality of life, attitude to life and resilience. iTTP patients had significantly more depressive symptoms (p < 0.001), a tendency to have anxiety disorders (p = 0.035) and a significantly worse cognitive performance (p = 0.008) compared to the controls. Sex, age, physical activity and partnership status had no significant influence on depression, whereas the number of comorbidities did. Lower scores of resilience, attitude to life and quality of life were reported by patients compared to controls. iTTP patients had a high prevalence of depression and anxiety, as well as a more negative attitude to life and low resilience. Resilience correlated negatively with the severity of the depression. Furthermore, quality of life and cognitive performance were significantly reduced. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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Review

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18 pages, 339 KiB  
Review
Platelet Transfusion—Insights from Current Practice to Future Development
by Annina Capraru, Katarzyna Aleksandra Jalowiec, Cesare Medri, Michael Daskalakis, Sacha Sergio Zeerleder and Behrouz Mansouri Taleghani
J. Clin. Med. 2021, 10(9), 1990; https://doi.org/10.3390/jcm10091990 - 06 May 2021
Cited by 8 | Viewed by 2869
Abstract
Since the late sixties, therapeutic or prophylactic platelet transfusion has been used to relieve hemorrhagic complications of patients with, e.g., thrombocytopenia, platelet dysfunction, and injuries, and is an essential part of the supportive care in high dose chemotherapy. Current and upcoming advances will [...] Read more.
Since the late sixties, therapeutic or prophylactic platelet transfusion has been used to relieve hemorrhagic complications of patients with, e.g., thrombocytopenia, platelet dysfunction, and injuries, and is an essential part of the supportive care in high dose chemotherapy. Current and upcoming advances will significantly affect present standards. We focus on specific issues, including the comparison of buffy-coat (BPC) and apheresis platelet concentrates (APC); plasma additive solutions (PAS); further measures for improvement of platelet storage quality; pathogen inactivation; and cold storage of platelets. The objective of this article is to give insights from current practice to future development on platelet transfusion, focusing on these selected issues, which have a potentially major impact on forthcoming guidelines. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
17 pages, 933 KiB  
Review
Thrombocytopenia and Hemostatic Changes in Acute and Chronic Liver Disease: Pathophysiology, Clinical and Laboratory Features, and Management
by Rüdiger E. Scharf
J. Clin. Med. 2021, 10(7), 1530; https://doi.org/10.3390/jcm10071530 - 06 Apr 2021
Cited by 34 | Viewed by 6689
Abstract
Thrombocytopenia, defined as a platelet count <150,000/μL, is the most common complication of advanced liver disease or cirrhosis with an incidence of up to 75%. A decrease in platelet count can be the first presenting sign and tends to be proportionally related to [...] Read more.
Thrombocytopenia, defined as a platelet count <150,000/μL, is the most common complication of advanced liver disease or cirrhosis with an incidence of up to 75%. A decrease in platelet count can be the first presenting sign and tends to be proportionally related to the severity of hepatic failure. The pathophysiology of thrombocytopenia in liver disease is multifactorial, including (i) splenomegaly and subsequently increased splenic sequestration of circulating platelets, (ii) reduced hepatic synthesis of thrombopoietin with missing stimulation both of megakaryocytopoiesis and thrombocytopoiesis, resulting in diminished platelet production and release from the bone marrow, and (iii) increased platelet destruction or consumption. Among these pathologies, the decrease in thrombopoietin synthesis has been identified as a central mechanism. Two newly licensed oral thrombopoietin mimetics/receptor agonists, avatrombopag and lusutrombopag, are now available for targeted treatment of thrombocytopenia in patients with advanced liver disease, who are undergoing invasive procedures. This review summarizes recent advances in the understanding of defective but at low level rebalanced hemostasis in stable cirrhosis, discusses clinical consequences and persistent controversial issues related to the inherent bleeding risk, and is focused on a risk-adapted management of thrombocytopenia in patients with chronic liver disease, including a restrictive transfusion regimen. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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21 pages, 1134 KiB  
Review
Challenges and Advances in Managing Thrombocytopenic Cancer Patients
by Avi Leader, Liron Hofstetter and Galia Spectre
J. Clin. Med. 2021, 10(6), 1169; https://doi.org/10.3390/jcm10061169 - 11 Mar 2021
Cited by 15 | Viewed by 6079
Abstract
Cancer patients have varying incidence, depth and duration of thrombocytopenia. The mainstay of managing severe chemotherapy-induced thrombocytopenia (CIT) in cancer is the use of platelet transfusions. While prophylactic platelet transfusions reduce the bleeding rate, multiple unmet needs remain, such as high residual rates [...] Read more.
Cancer patients have varying incidence, depth and duration of thrombocytopenia. The mainstay of managing severe chemotherapy-induced thrombocytopenia (CIT) in cancer is the use of platelet transfusions. While prophylactic platelet transfusions reduce the bleeding rate, multiple unmet needs remain, such as high residual rates of bleeding, and anticancer treatment dose reductions/delays. Accordingly, the following promising results in other settings, antifibrinolytic drugs have been evaluated for prevention and treatment of bleeding in patients with hematological malignancies and solid tumors. In addition, Thrombopoeitin receptor agonists have been studied for two major implications in cancer: treatment of severe thrombocytopenia associated with myelodysplastic syndrome and acute myeloid leukemia; primary and secondary prevention of CIT in solid tumors in order to maintain dose density and intensity of anti-cancer treatment. Furthermore, thrombocytopenic cancer patients are often prescribed antithrombotic medication for indications arising prior or post cancer diagnosis. Balancing the bleeding and thrombotic risks in such patients represents a unique clinical challenge. This review focuses upon non-transfusion-based approaches to managing thrombocytopenia and the associated bleeding risk in cancer, and also addresses the management of antithrombotic therapy in thrombocytopenic cancer patients. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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22 pages, 4207 KiB  
Review
Platelet Phenotyping and Function Testing in Thrombocytopenia
by Kerstin Jurk and Yavar Shiravand
J. Clin. Med. 2021, 10(5), 1114; https://doi.org/10.3390/jcm10051114 - 07 Mar 2021
Cited by 11 | Viewed by 4105
Abstract
Patients who suffer from inherited or acquired thrombocytopenia can be also affected by platelet function defects, which potentially increase the risk of severe and life-threatening bleeding complications. A plethora of tests and assays for platelet phenotyping and function analysis are available, which are, [...] Read more.
Patients who suffer from inherited or acquired thrombocytopenia can be also affected by platelet function defects, which potentially increase the risk of severe and life-threatening bleeding complications. A plethora of tests and assays for platelet phenotyping and function analysis are available, which are, in part, feasible in clinical practice due to adequate point-of-care qualities. However, most of them are time-consuming, require experienced and skilled personnel for platelet handling and processing, and are therefore well-established only in specialized laboratories. This review summarizes major indications, methods/assays for platelet phenotyping, and in vitro function testing in blood samples with reduced platelet count in relation to their clinical practicability. In addition, the diagnostic significance, difficulties, and challenges of selected tests to evaluate the hemostatic capacity and specific defects of platelets with reduced number are addressed. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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20 pages, 1387 KiB  
Review
When Should We Think of Myelodysplasia or Bone Marrow Failure in a Thrombocytopenic Patient? A Practical Approach to Diagnosis
by Nicolas Bonadies, Alicia Rovó, Naomi Porret and Ulrike Bacher
J. Clin. Med. 2021, 10(5), 1026; https://doi.org/10.3390/jcm10051026 - 02 Mar 2021
Cited by 8 | Viewed by 6090
Abstract
Thrombocytopenia can arise from various conditions, including myelodysplastic syndromes (MDS) and bone marrow failure (BMF) syndromes. Meticulous assessment of the peripheral blood smear, identification of accompanying clinical conditions, and characterization of the clinical course are important for initial assessment of unexplained thrombocytopenia. Increased [...] Read more.
Thrombocytopenia can arise from various conditions, including myelodysplastic syndromes (MDS) and bone marrow failure (BMF) syndromes. Meticulous assessment of the peripheral blood smear, identification of accompanying clinical conditions, and characterization of the clinical course are important for initial assessment of unexplained thrombocytopenia. Increased awareness is required to identify patients with suspected MDS or BMF, who are in need of further investigations by a step-wise approach. Bone marrow cytomorphology, histopathology, and cytogenetics are complemented by myeloid next-generation sequencing (NGS) panels. Such panels are helpful to distinguish reactive cytopenia from clonal conditions. MDS are caused by mutations in the hematopoietic stem/progenitor cells, characterized by cytopenia and dysplasia, and an inherent risk of leukemic progression. Aplastic anemia (AA), the most frequent acquired BMF, is immunologically driven and characterized by an empty bone marrow. Diagnosis remains challenging due to overlaps with other hematological disorders. Congenital BMF, certainly rare in adulthood, can present atypically with thrombocytopenia and can be misdiagnosed. Analyses for chromosome fragility, telomere length, and germline gene sequencing are needed. Interdisciplinary expert teams contribute to diagnosis, prognostication, and choice of therapy for patients with suspected MDS and BMF. With this review we aim to increase the awareness and provide practical approaches for diagnosis of these conditions in suspicious cases presenting with thrombocytopenia. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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28 pages, 956 KiB  
Review
Thrombocytopathies: Not Just Aggregation Defects—The Clinical Relevance of Procoagulant Platelets
by Alessandro Aliotta, Debora Bertaggia Calderara, Maxime G. Zermatten, Matteo Marchetti and Lorenzo Alberio
J. Clin. Med. 2021, 10(5), 894; https://doi.org/10.3390/jcm10050894 - 24 Feb 2021
Cited by 17 | Viewed by 5115
Abstract
Platelets are active key players in haemostasis. Qualitative platelet dysfunctions result in thrombocytopathies variously characterized by defects of their adhesive and procoagulant activation endpoints. In this review, we summarize the traditional platelet defects in adhesion, secretion, and aggregation. In addition, we review the [...] Read more.
Platelets are active key players in haemostasis. Qualitative platelet dysfunctions result in thrombocytopathies variously characterized by defects of their adhesive and procoagulant activation endpoints. In this review, we summarize the traditional platelet defects in adhesion, secretion, and aggregation. In addition, we review the current knowledge about procoagulant platelets, focusing on their role in bleeding or thrombotic pathologies and their pharmaceutical modulation. Procoagulant activity is an important feature of platelet activation, which should be specifically evaluated during the investigation of a suspected thrombocytopathy. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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33 pages, 722 KiB  
Review
Thrombocytopenia in Virus Infections
by Matthijs Raadsen, Justin Du Toit, Thomas Langerak, Bas van Bussel, Eric van Gorp and Marco Goeijenbier
J. Clin. Med. 2021, 10(4), 877; https://doi.org/10.3390/jcm10040877 - 20 Feb 2021
Cited by 58 | Viewed by 12223
Abstract
Thrombocytopenia, which signifies a low platelet count usually below 150 × 109/L, is a common finding following or during many viral infections. In clinical medicine, mild thrombocytopenia, combined with lymphopenia in a patient with signs and symptoms of an infectious disease, [...] Read more.
Thrombocytopenia, which signifies a low platelet count usually below 150 × 109/L, is a common finding following or during many viral infections. In clinical medicine, mild thrombocytopenia, combined with lymphopenia in a patient with signs and symptoms of an infectious disease, raises the suspicion of a viral infection. This phenomenon is classically attributed to platelet consumption due to inflammation-induced coagulation, sequestration from the circulation by phagocytosis and hypersplenism, and impaired platelet production due to defective megakaryopoiesis or cytokine-induced myelosuppression. All these mechanisms, while plausible and supported by substantial evidence, regard platelets as passive bystanders during viral infection. However, platelets are increasingly recognized as active players in the (antiviral) immune response and have been shown to interact with cells of the innate and adaptive immune system as well as directly with viruses. These findings can be of interest both for understanding the pathogenesis of viral infectious diseases and predicting outcome. In this review, we will summarize and discuss the literature currently available on various mechanisms within the relationship between thrombocytopenia and virus infections. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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21 pages, 902 KiB  
Review
Primary Immune Thrombocytopenia: Novel Insights into Pathophysiology and Disease Management
by Anurag Singh, Günalp Uzun and Tamam Bakchoul
J. Clin. Med. 2021, 10(4), 789; https://doi.org/10.3390/jcm10040789 - 16 Feb 2021
Cited by 40 | Viewed by 19267
Abstract
Immune thrombocytopenia (ITP) is an autoimmune disorder defined by a significantly reduced number of platelets in blood circulation. Due to low levels of platelets, ITP is associated with frequent bruising and bleeding. Current evidence suggests that low platelet counts in ITP are the [...] Read more.
Immune thrombocytopenia (ITP) is an autoimmune disorder defined by a significantly reduced number of platelets in blood circulation. Due to low levels of platelets, ITP is associated with frequent bruising and bleeding. Current evidence suggests that low platelet counts in ITP are the result of multiple factors, including impaired thrombopoiesis and variations in immune response leading to platelet destruction during pathological conditions. Patient outcomes as well as clinic presentation of the disease have largely been shown to be case-specific, hinting towards ITP rather being a group of clinical conditions sharing common symptoms. The most frequent characteristics include dysfunction in primary haemostasis and loss of immune tolerance towards platelet as well as megakaryocyte antigens. This heterogeneity in patient population and characteristics make it challenging for the clinicians to choose appropriate therapeutic regimen. Therefore, it is vital to understand the pathomechanisms behind the disease and to consider various factors including patient age, platelet count levels, co-morbidities and patient preferences before initiating therapy. This review summarizes recent developments in the pathophysiology of ITP and provides a comprehensive overview of current therapeutic strategies as well as potential future drugs for the management of ITP. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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16 pages, 774 KiB  
Review
Heparin-Induced Thrombocytopenia: A Review of New Concepts in Pathogenesis, Diagnosis, and Management
by Matteo Marchetti, Maxime G. Zermatten, Debora Bertaggia Calderara, Alessandro Aliotta and Lorenzo Alberio
J. Clin. Med. 2021, 10(4), 683; https://doi.org/10.3390/jcm10040683 - 10 Feb 2021
Cited by 28 | Viewed by 8586
Abstract
Knowledge on heparin-induced thrombocytopenia keeps increasing. Recent progress on diagnosis and management as well as several discoveries concerning its pathogenesis have been made. However, many aspects of heparin-induced thrombocytopenia remain partly unknown, and exact application of these new insights still need to be [...] Read more.
Knowledge on heparin-induced thrombocytopenia keeps increasing. Recent progress on diagnosis and management as well as several discoveries concerning its pathogenesis have been made. However, many aspects of heparin-induced thrombocytopenia remain partly unknown, and exact application of these new insights still need to be addressed. This article reviews the main new concepts in pathogenesis, diagnosis, and management of heparin-induced thrombocytopenia. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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14 pages, 586 KiB  
Review
Quantitative and Qualitative Platelet Derangements in Cardiac Surgery and Extracorporeal Life Support
by Enrico Squiccimarro, Federica Jiritano, Giuseppe Filiberto Serraino, Hugo ten Cate, Domenico Paparella and Roberto Lorusso
J. Clin. Med. 2021, 10(4), 615; https://doi.org/10.3390/jcm10040615 - 06 Feb 2021
Cited by 8 | Viewed by 3976
Abstract
Thrombocytopenia and impaired platelet function are known as intrinsic drawbacks of cardiac surgery and extracorporeal life supports (ECLS). A number of different factors influence platelet count and function including the inflammatory response to a cardiopulmonary bypass (CPB) or to ECLS, hemodilution, hypothermia, mechanical [...] Read more.
Thrombocytopenia and impaired platelet function are known as intrinsic drawbacks of cardiac surgery and extracorporeal life supports (ECLS). A number of different factors influence platelet count and function including the inflammatory response to a cardiopulmonary bypass (CPB) or to ECLS, hemodilution, hypothermia, mechanical damage and preoperative treatment with platelet-inhibiting agents. Moreover, although underestimated, heparin-induced thrombocytopenia is still a hiccup in the perioperative management of cardiac surgical and, above all, ECLS patients. Moreover, recent investigations have highlighted how platelet disorders also affect patients undergoing biological prosthesis implantation. Though many hypotheses have been suggested, the mechanism underlying thrombocytopenia and platelet disorders is still to be cleared. This narrative review aims to offer clinicians a summary of their major causes in the cardiac surgery setting. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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19 pages, 3229 KiB  
Review
Pseudothrombocytopenia—A Review on Causes, Occurrence and Clinical Implications
by Benjamin Lardinois, Julien Favresse, Bernard Chatelain, Giuseppe Lippi and François Mullier
J. Clin. Med. 2021, 10(4), 594; https://doi.org/10.3390/jcm10040594 - 04 Feb 2021
Cited by 30 | Viewed by 7523
Abstract
Pseudothrombocytopenia (PTCP), a relative common finding in clinical laboratories, can lead to diagnostic errors, overtreatment, and further (even invasive) unnecessary testing. Clinical consequences with potential life-threatening events (e.g., unnecessary platelet transfusion, inappropriate treatment including splenectomy or corticosteroids) are still observed when PTCP is [...] Read more.
Pseudothrombocytopenia (PTCP), a relative common finding in clinical laboratories, can lead to diagnostic errors, overtreatment, and further (even invasive) unnecessary testing. Clinical consequences with potential life-threatening events (e.g., unnecessary platelet transfusion, inappropriate treatment including splenectomy or corticosteroids) are still observed when PTCP is not readily detected. The phenomenon is even more complex when occurring with different anticoagulants. In this review we present a case of multi-anticoagulant PTCP, where we studied different parameters including temperature, amikacin supplementation, measurement methods, and type of anticoagulant. Prevalence, clinical risk factors, pre-analytical and analytical factors, along with clinical implications, will be discussed. The detection of an anticoagulant-dependent PTCP does not necessarily imply the presence of specific disorders. Conversely, the incidence of PTCP seems higher in patients receiving low molecular weight heparin, during hospitalization, or in men aged 50 years or older. New analytical technologies, such as fluorescence or optical platelet counting, will be soon overturning traditional algorithms and represent valuable diagnostic aids. A practical laboratory approach, based on current knowledge of PTCP, is finally proposed for overcoming spuriously low platelet counts. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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24 pages, 1267 KiB  
Review
Thrombotic Thrombocytopenic Purpura: Pathophysiology, Diagnosis, and Management
by Senthil Sukumar, Bernhard Lämmle and Spero R. Cataland
J. Clin. Med. 2021, 10(3), 536; https://doi.org/10.3390/jcm10030536 - 02 Feb 2021
Cited by 91 | Viewed by 19166
Abstract
Thrombotic thrombocytopenic purpura (TTP) is a rare thrombotic microangiopathy characterized by microangiopathic hemolytic anemia, severe thrombocytopenia, and ischemic end organ injury due to microvascular platelet-rich thrombi. TTP results from a severe deficiency of the specific von Willebrand factor (VWF)-cleaving protease, ADAMTS13 (a disintegrin [...] Read more.
Thrombotic thrombocytopenic purpura (TTP) is a rare thrombotic microangiopathy characterized by microangiopathic hemolytic anemia, severe thrombocytopenia, and ischemic end organ injury due to microvascular platelet-rich thrombi. TTP results from a severe deficiency of the specific von Willebrand factor (VWF)-cleaving protease, ADAMTS13 (a disintegrin and metalloprotease with thrombospondin type 1 repeats, member 13). ADAMTS13 deficiency is most commonly acquired due to anti-ADAMTS13 autoantibodies. It can also be inherited in the congenital form as a result of biallelic mutations in the ADAMTS13 gene. In adults, the condition is most often immune-mediated (iTTP) whereas congenital TTP (cTTP) is often detected in childhood or during pregnancy. iTTP occurs more often in women and is potentially lethal without prompt recognition and treatment. Front-line therapy includes daily plasma exchange with fresh frozen plasma replacement and immunosuppression with corticosteroids. Immunosuppression targeting ADAMTS13 autoantibodies with the humanized anti-CD20 monoclonal antibody rituximab is frequently added to the initial therapy. If available, anti-VWF therapy with caplacizumab is also added to the front-line setting. While it is hypothesized that refractory TTP will be less common in the era of caplacizumab, in relapsed or refractory cases cyclosporine A, N-acetylcysteine, bortezomib, cyclophosphamide, vincristine, or splenectomy can be considered. Novel agents, such as recombinant ADAMTS13, are also currently under investigation and show promise for the treatment of TTP. Long-term follow-up after the acute episode is critical to monitor for relapse and to diagnose and manage chronic sequelae of this disease. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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24 pages, 1227 KiB  
Review
Learning the Ropes of Platelet Count Regulation: Inherited Thrombocytopenias
by Loredana Bury, Emanuela Falcinelli and Paolo Gresele
J. Clin. Med. 2021, 10(3), 533; https://doi.org/10.3390/jcm10030533 - 02 Feb 2021
Cited by 15 | Viewed by 4595
Abstract
Inherited thrombocytopenias (IT) are a group of hereditary disorders characterized by a reduced platelet count sometimes associated with abnormal platelet function, which can lead to bleeding but also to syndromic manifestations and predispositions to other disorders. Currently at least 41 disorders caused by [...] Read more.
Inherited thrombocytopenias (IT) are a group of hereditary disorders characterized by a reduced platelet count sometimes associated with abnormal platelet function, which can lead to bleeding but also to syndromic manifestations and predispositions to other disorders. Currently at least 41 disorders caused by mutations in 42 different genes have been described. The pathogenic mechanisms of many forms of IT have been identified as well as the gene variants implicated in megakaryocyte maturation or platelet formation and clearance, while for several of them the pathogenic mechanism is still unknown. A range of therapeutic approaches are now available to improve survival and quality of life of patients with IT; it is thus important to recognize an IT and establish a precise diagnosis. ITs may be difficult to diagnose and an initial accurate clinical evaluation is mandatory. A combination of clinical and traditional laboratory approaches together with advanced sequencing techniques provide the highest rate of diagnostic success. Despite advancement in the diagnosis of IT, around 50% of patients still do not receive a diagnosis, therefore further research in the field of ITs is warranted to further improve patient care. Full article
(This article belongs to the Special Issue The Latest Clinical Advances in Thrombocytopenia)
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