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Rahmati N, Keshavarz Motamed P, Maftoon N. Numerical study of ultra-large von Willebrand factor multimers in coagulopathy. Biomech Model Mechanobiol 2024; 23:737-756. [PMID: 38217745 DOI: 10.1007/s10237-023-01803-5] [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: 07/27/2023] [Accepted: 11/30/2023] [Indexed: 01/15/2024]
Abstract
An excessive von Willebrand factor (VWF) secretion, coupled with a moderate to severe deficiency of ADAMTS13 activity, serves as a linking mechanism between inflammation to thrombosis. The former facilitates platelet adhesion to the vessel wall and the latter is required to cleave VWF multimers. As a result, the ultra-large VWF (UL-VWF) multimers released by Weibel-Palade bodies remain uncleaved. In this study, using a computational model based on first principles, we quantitatively show how the uncleaved UL-VWF multimers interact with the blood cells to initiate microthrombosis. We observed that platelets first adhere to unfolded and stretched uncleaved UL-VWF multimers anchored to the microvessel wall. By the end of this initial adhesion phase, the UL-VWF multimers and platelets make a mesh-like trap in which the red blood cells increasingly accumulate to initiate a gradually growing microthrombosis. Although high-shear rate and blood flow velocity are required to activate platelets and unfold the UL-VWFs, during the initial adhesion phase, the blood velocity drastically drops after thrombosis, and as a result, the wall shear stress is elevated near UL-VWF roots, and the pressure drops up to 6 times of the healthy condition. As the time passes, these trends progressively continue until the microthrombosis fully develops and the effective size of the microthrombosis and these flow quantities remain almost constant. Our findings quantitatively demonstrate the potential role of UL-VWF in coagulopathy.
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Affiliation(s)
- Nahid Rahmati
- Department of Systems Design Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada
- Centre for Bioengineering and Biotechnology, University of Waterloo, Waterloo, ON, Canada
| | - Pouyan Keshavarz Motamed
- Department of Systems Design Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada
- Centre for Bioengineering and Biotechnology, University of Waterloo, Waterloo, ON, Canada
| | - Nima Maftoon
- Department of Systems Design Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada.
- Centre for Bioengineering and Biotechnology, University of Waterloo, Waterloo, ON, Canada.
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Ward SE, Fogarty H, Karampini E, Lavin M, Schneppenheim S, Dittmer R, Morrin H, Glavey S, Ni Cheallaigh C, Bergin C, Martin-Loeches I, Mallon PW, Curley GF, Baker RI, Budde U, O'Sullivan JM, O'Donnell JS. ADAMTS13 regulation of VWF multimer distribution in severe COVID-19. J Thromb Haemost 2021; 19:1914-1921. [PMID: 34053187 PMCID: PMC8237059 DOI: 10.1111/jth.15409] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 05/11/2021] [Accepted: 05/27/2021] [Indexed: 12/27/2022]
Abstract
BACKGROUND Consistent with fulminant endothelial cell activation, elevated plasma von Willebrand factor (VWF) antigen levels have been reported in patients with COVID-19. The multimeric size and function of VWF are normally regulated through A Disintegrin And Metalloprotease with ThrombSpondin Motif type 1 motif, member 13 (ADAMTS-13)--mediated proteolysis. OBJECTIVES This study investigated the hypothesis that ADAMTS-13 regulation of VWF multimer distribution may be impaired in severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) infection contributing to the observed microvascular thrombosis. PATIENTS AND METHODS Patients with COVID-19 (n = 23) were recruited from the Beaumont Hospital Intensive Care Unit (ICU) in Dublin. Plasma VWF antigen, multimer distribution, ADAMTS-13 activity, and known inhibitors thereof were assessed. RESULTS We observed markedly increased VWF collagen-binding activity in patients with severe COVID-19 compared to controls (median 509.1 versus 94.3 IU/dl). Conversely, plasma ADAMTS-13 activity was significantly reduced (median 68.2 IU/dl). In keeping with an increase in VWF:ADAMTS-13 ratio, abnormalities in VWF multimer distribution were common in patients with COVID-19, with reductions in high molecular weight VWF multimers. Terminal sialylation regulates VWF susceptibility to proteolysis by ADAMTS-13 and other proteases. We observed that both N- and O-linked sialylation were altered in severe COVID-19. Furthermore, plasma levels of the ADAMTS-13 inhibitors interleukin-6, thrombospondin-1, and platelet factor 4 were significantly elevated. CONCLUSIONS These findings support the hypothesis that SARS-CoV-2 is associated with profound quantitative and qualitative increases in plasma VWF levels, and a multifactorial down-regulation in ADAMTS-13 function. Further studies will be required to determine whether therapeutic interventions to correct ADAMTS-13-VWF multimer dysfunction may be useful in COVID-microvascular thrombosis and angiopathy.
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Affiliation(s)
- Soracha E Ward
- Irish Centre for Vascular Biology, School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Helen Fogarty
- Irish Centre for Vascular Biology, School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Ellie Karampini
- Irish Centre for Vascular Biology, School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Michelle Lavin
- Irish Centre for Vascular Biology, School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland
- National Coagulation Centre, St James's Hospital, Dublin, Ireland
| | - Sonja Schneppenheim
- Department of Hämostaseology, Medilys Laborgesellschaft mbH, Hamburg, Germany
| | - Rita Dittmer
- Department of Hämostaseology, Medilys Laborgesellschaft mbH, Hamburg, Germany
| | - Hannah Morrin
- Irish Centre for Vascular Biology, School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Siobhan Glavey
- Department of Haematology, Beaumont Hospital, Dublin, Ireland
- Royal College of Surgeons in Ireland, Dublin, Ireland
| | | | - Colm Bergin
- St James's Hospital, Trinity College Dublin, Dublin, Ireland
| | - Ignacio Martin-Loeches
- Irish Centre for Vascular Biology, School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland
- St James's Hospital, Trinity College Dublin, Dublin, Ireland
| | - Patrick W Mallon
- Centre for Experimental Pathogen Host Research, University College Dublin, Ireland
- St Vincent's University Hospital, Dublin, Ireland
| | - Gerard F Curley
- Department of Anaesthesia and Critical Care, RCSI, Dublin, Ireland
| | - Ross I Baker
- Western Australia Centre for Thrombosis and Haemostasis, Perth Blood Institute, Murdoch University, Perth, Australia
| | - Ulrich Budde
- Department of Hämostaseology, Medilys Laborgesellschaft mbH, Hamburg, Germany
| | - Jamie M O'Sullivan
- Irish Centre for Vascular Biology, School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - James S O'Donnell
- Irish Centre for Vascular Biology, School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland
- National Coagulation Centre, St James's Hospital, Dublin, Ireland
- National Children's Research Centre, Our Lady's Children's Hospital Crumlin, Dublin, Ireland
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3
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Meraz-Munoz A, Langote A, Jhaveri KD, Izzedine H, Gudsoorkar P. Acute Kidney Injury in the Patient with Cancer. Diagnostics (Basel) 2021; 11:611. [PMID: 33805529 PMCID: PMC8065801 DOI: 10.3390/diagnostics11040611] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 03/18/2021] [Accepted: 03/22/2021] [Indexed: 01/18/2023] Open
Abstract
Over the last three decades, advancements in the diagnosis, treatment, and supportive care of patients with cancer have significantly improved their overall survival. However, these advancements have also led to a higher rate of cancer-related complications. Acute kidney injury (AKI) and chronic kidney disease (CKD) are highly prevalent in patients with cancer, and they are associated with an increased risk of all-cause mortality. This bidirectional interplay between cancer and kidney, termed "the kidney-cancer connection" has become a very active area of research. This review aims to provide an overview of some of the most common causes of AKI in patients with cancer. Cancer therapy-associated AKI is beyond the scope of this review and will be discussed separately.
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Affiliation(s)
- Alejandro Meraz-Munoz
- Division of Nephrology, Department of Medicine, St Michael’s Hospital, Toronto, ON M5B 1W8, Canada;
| | - Amit Langote
- Consultant Nephrologist, Apollo Hospital, Navi Mumbai, Maharashtra 400614, India;
| | - Kenar D. Jhaveri
- Division of Kidney Diseases and Hypertension, Donald and Barbara Zucker School of Medicine, Great Neck, NY 11021, USA;
| | - Hassane Izzedine
- Department of Nephrology, Peupliers Private Hospital, Ramsay Générale de Santé, 75013 Paris, France;
| | - Prakash Gudsoorkar
- Division of Nephrology & Kidney Clinical Advancement, Research & Education Program, University of Cincinnati, Cincinnati, OH 45267, USA
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Predictors of relapse and efficacy of rituximab in immune thrombotic thrombocytopenic purpura. Blood Adv 2020; 3:1512-1518. [PMID: 31076407 DOI: 10.1182/bloodadvances.2019031039] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 04/01/2019] [Indexed: 12/12/2022] Open
Abstract
Patients with immune-mediated thrombotic thrombocytopenic purpura (iTTP) often experience life-threatening relapses of the disease, and rituximab (RTX) can be used to mitigate relapse risk. However, the predictors of relapse in iTTP and the magnitude and duration of effect of RTX remain key unanswered questions. Using a multi-institutional cohort of consecutive adult patients with iTTP, we used survival analysis to compare relapse rates between patients who received RTX during the index presentation with acute iTTP and those who did not. Of 124 patients, 60 (48%) received RTX and 34 (27%) experienced relapse. Median time to relapse was 3.71 (interquartile range, 1.75-4.9) and 1.33 (interquartile range, 0.43-2.35) years for RTX-treated and untreated patients, respectively. RTX conferred protection from relapse at 1 year of follow-up (P = .01) but not at 5 years of follow-up. Extended Cox regression was then used to identify predictors of relapse and to estimate the protective effect of RTX. The following parameters were independently associated with increased risk for subsequent relapse: presenting in iTTP relapse (hazard ratio [HR], 2.97; 95% confidence interval [CI], 1.4-6.4), age younger than 25 years (HR, 2.94; 95% CI, 1.2-7.2), and non-O blood group (HR, 2.15; 95% CI, 1.06-4.39). RTX initially provided protection from relapse (HR, 0.16; 95% CI, 0.04-0.70), but this effect gradually diminished, returning to the baseline risk for untreated patients at approximately 2.6 years. Patients who are young, have non-O blood group, or present with relapsed iTTP are at increased risk for subsequent relapse. RTX appears to confer short-term protection from relapse.
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Komplexe Gerinnungsstörungen. Hamostaseologie 2010. [PMCID: PMC7123555 DOI: 10.1007/978-3-642-01544-1_35] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Die thrombotisch-thrombozytopenische Purpura (TTP) und das hämolytischurämische Syndrom (HUS) sind thrombotische Mikroangiopathien, gekennzeichnet durch eine Endothelzellschädigung mit nachfolgender Bildung von Thromben in der Mikrozirkulation mit intravasaler Hämolyse und Thrombozytopenie. Ischämische Organdysfunktionen im Gehirn, den Nieren und anderen Organen Prägen das klinische Bild. Während bei Erwachsenen das Auftreten einer neurologischen Symptomatik zur Diagnose TTP führt, wird bei Kindern mit dem Leitsymptom Nierenversagen die Diagnose HUS gestellt.
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Gürcan HM, Keskin DB, Stern JNH, Nitzberg MA, Shekhani H, Ahmed AR. A review of the current use of rituximab in autoimmune diseases. Int Immunopharmacol 2008; 9:10-25. [PMID: 19000786 DOI: 10.1016/j.intimp.2008.10.004] [Citation(s) in RCA: 240] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2008] [Revised: 10/13/2008] [Accepted: 10/13/2008] [Indexed: 12/28/2022]
Abstract
Rituximab is a human/murine chimeric monoclonal antibody primarily used for treating non-Hodgkin's B-cell lymphoma. Recently it has also been used in the treatment of several autoimmune diseases. A literature review was conducted to determine the efficacy of rituximab in the treatment of some of these autoimmune diseases. Multiple mechanisms proposed for the rituximab mediated B cell depletion are also discussed. The efficacy of rituximab is well-established and it is FDA approved for treatment of Rheumatoid arthritis. In this review, data on the use of rituximab is presented from 92 studies involving 1197 patients with the following diseases: systemic lupus erythematosus, idiopathic thrombocytopenic purpura, anti-neutrophil cytoplasmic antibody associated vasculitis, Grave's disease, autoimmune hemolytic anemia, pemphigus vulgaris, hemophilia A, cold agglutinin disease, Sjogren's syndrome, graft vs. host disease, thrombotic thrombocytopenic purpura, cryoglobulinemia, IgM mediated neuropathy, multiple sclerosis, neuromyelitis optica, idiopathic membranous nephropathy, dermatomyositis, and opsoclonus myoclonus. The efficacy varies among different autoimmune diseases. The cumulative data would suggest that in the vast majority of studies in this review, RTX has a beneficial role in their treatment. While rituximab is very effective in the depletion of B cells, current research suggests it may also influence other cells of the immune system by re-establishing immune homeostasis and tolerance. The safety profile of RTX reveals that most reactions are infusion related. In patients with autoimmune diseases the incidence of serious and severe side effects is low. Systemic infection still remains a major concern and may result in death.
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Affiliation(s)
- Hakan M Gürcan
- Center for Blistering Diseases, New England Baptist Hospital, Boston, MA 02120, USA
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Pregnancy and coma. HANDBOOK OF CLINICAL NEUROLOGY 2008. [PMID: 18631830 DOI: 10.1016/s0072-9752(07)01717-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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Abstract
This overview summarizes the history of thrombotic thrombocytopenic purpura (TTP) from its initial recognition in 1924 as a most often fatal disease to the discovery in 1997 of ADAMTS-13 deficiency as a major risk factor for acute disease manifestation. The cloning of the metalloprotease, ADAMTS-13, an essential regulator of the extremely adhesive unusually large von Willebrand factor (VWF) multimers secreted by endothelial cells, as well as ADAMTS-13 structure and function are reviewed. The complex, initially devised assays for ADAMTS-13 activity and the possible limitations of static in vitro assays are described. A new, simple assay using a recombinant 73-amino acid VWF peptide as substrate will hopefully be useful. Hereditary TTP caused by homozygous or double heterozygous ADAMTS-13 mutations and the nature of the mutations so far identified are discussed. Recognition of this condition by clinicians is of utmost importance, because it can be easily treated and--if untreated--frequently results in death. Acquired TTP is often but not always associated with severe, autoantibody-mediated ADAMTS-13 deficiency. The pathogenesis of cases without severe deficiency of the VWF-cleaving protease remains unknown, affected patients cannot be distinguished clinically from those with severely decreased ADAMTS-13 activity. Survivors of acute TTP, especially those with autoantibody-induced ADAMTS-13 deficiency, are at a high risk for relapse, as are patients with hereditary TTP. Patients with thrombotic microangiopathies (TMA) associated with hematopoietic stem cell transplantation, neo-plasia and several drugs, usually have normal or only moderately reduced ADAMTS-13 activity, with the exception of ticlopidine-induced TMA. Diarrhea-positive-hemolytic uremic syndrome (D+ HUS), mainly occurring in children is due to enterohemorrhagic Escherichia coli infection, and cases with atypical, D- HUS may be associated with factor H abnormalities. Treatment of acquired idiopathic TTP involves plasma exchange with fresh frozen plasma (FFP), and probably immunosuppression with corticosteroids is indicated. We believe that, at present, patients without severe acquired ADAMTS-13 deficiency should be treated with plasma exchange as well, until better strategies become available. Constitutional TTP can be treated by simple FFP infusion that rapidly reverses acute disease and--given prophylactically every 2-3 weeks--prevents relapses. There remains a large research agenda to improve diagnosis of TMA, gain further insight into the pathophysiology of the various TMA and to improve and possibly tailor the management of affected patients.
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Affiliation(s)
- B Lämmle
- Department of Hematology and Central Hematology Laboratory, Inselspital, University Hospital, Bern, Switzerland.
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Chang JC, Naqvi T. Thrombotic thrombocytopenic purpura associated with bone marrow metastasis and secondary myelofibrosis in cancer. Oncologist 2003; 8:375-80. [PMID: 12897334 DOI: 10.1634/theoncologist.8-4-375] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
To examine the relationship between cancer and development of thrombotic microangiopathy (TM), the medical records of patients with known TM were examined in one institution from January 1981 to December 2002. Nine out of 93 patients with the established diagnosis of TM had active cancer. All nine of those patients had thrombotic thrombocytopenic purpura (TTP). Among those patients, two patients received chemotherapy prior to the development of TTP. Six of the seven patients who received no chemotherapy had extensive bone marrow metastasis and secondary myelofibrosis. There were two patients each with breast cancer, lung cancer, and stomach cancer. Severe anemia and thrombocytopenia with leukoerythroblastosis were prominent clinical features in all six patients. Four patients had neurological (mental) changes and three developed fever, but none had significant renal dysfunction. Upon establishing the diagnosis of TTP, four patients were treated with exchange plasmapheresis (EP) and two patients were treated with chemotherapy because there were no neurological changes. Three patients achieved complete remission of TTP, one with EP alone and two with chemotherapy. The one patient who achieved remission with EP alone was later treated with chemotherapy and survived for 2 1/2 years. The other three patients treated with EP alone died within 2 months after the diagnosis of TTP. Since TTP occurred in association with bone marrow metastasis and myelofibrosis in six patients among seven chemotherapy-untreated cancer patients, this marrow change was considered to be the possible cause of the development of TTP. It is recommended that all cancer patients with unexplained anemia and thrombocytopenia be evaluated for the coexistence of bone marrow metastasis and TTP.
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Affiliation(s)
- Jae C Chang
- University of California, Irvine College of Medicine and Division of Hematology/Oncology at UCI Medical Center, Orange, California 92868, USA.
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Kanj NA, Mikati ARA, Kfoury Baz EM. Early relapse of thrombotic thrombocytopenic purpura during therapeutic plasma exchange associated with Acinetobacter anitratus bacteremia. Ther Apher Dial 2003; 7:119-21. [PMID: 12921127 DOI: 10.1046/j.1526-0968.2003.00016.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Thrombotic thrombocytopenic purpura (TTP)/Hemolytic-uremic syndrome (HUS) is a syndrome characterized by thrombocytopenia, microangiopathic hemolytic anemia, fever, renal failure and neurologic manifestation. Almost all cases are idiopathic. However, secondary TTP/HUS associated with viral, bacterial and mycobacterial infections, drugs, connective tissue disease, solid tumors, bone marrow transplantation and pregnancy have been described. Early relapse associated with infection is a rare occurrence. The patient we report had a classic case of postdiarrheal TTP/HUS that responded to plasmapheresis but relapsed during treatment as reflected by the increased schistocytosis, decreased hematocrit, increased lactate dehydrogenase, and decreased platelet counts. This relapse may be attributed to Acinetobacter anitratus bacteremia, secondary to central line infection. Administration of antimicrobial treatment resulted initially in a mild improvement. However, this was followed by a fatal relapse. The importance of monitoring the possible bacterial colonization of an indwelling catheter is thus emphasized.
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Affiliation(s)
- Nadim A Kanj
- Department of Internal Medicine, American University of Beirut Medical Center, Beirut, Lebanon
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Talwalkar JA, Ruymann FW, Marcoux P, Farraye FA. Recurrent thrombotic thrombocytopenic purpura (TTP) as a complication of acute relapsing pancreatitis. Dig Dis Sci 2002; 47:1096-9. [PMID: 12018906 DOI: 10.1023/a:1015098325971] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
Pancreatitis is a known complication of thrombotic thrombocytopenic purpura (TTP) found in approximately 2% of cases. The development of TTP as a clinical sequelae of acute pancreatitis has also been reported, including one patient with chronic pancreatitis who developed TTP on two occasions following acute exacerbations of pancreatitis. We describe a case in which multiple distinct episodes of TTP have followed the clinical and laboratory demonstration of acute pancreatitis in the same patient. Supportive care of the patient's pancreatitis and plasmapheresis in each case resulted in clinical improvement and resolution of TTP. While the pathophysiologic mechanism explaining this association remains unclear, the recurrence of TTP associated with the "rechallenge" of relapsing episodes of pancreatitis in our patient suggests that a cause-and-effect relationship does exist.
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Affiliation(s)
- Jayant A Talwalkar
- Division of Gastroenterology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
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Chang JC, Kathula SK. Various clinical manifestations in patients with thrombotic microangiopathy. J Investig Med 2002; 50:201-6. [PMID: 12033285 DOI: 10.2310/6650.2002.33434] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
BACKGROUND Thrombotic microangiopathy (TM) is characterized by thrombocytopenia and microangiopathic hemolytic anemia in association with diffuse microthrombi in the arteriolar capillaries of various organs. Its clinical manifestation is protean, and a few well-defined clinical syndromes have been recognized. A clear understanding of the consequence of TM is needed to appreciate the unusual clinical syndromes due to atypical presentation of thrombotic thrombocytopenic purpura (TTP). METHODS The medical records of patients with known diagnoses of TTP, hemolytic uremic syndrome (HUS), and the syndrome in which hemolysis, elevated liver enzymes, and low platelet count are found in association with pregnancy were examined retrospectively from 1981 to 1994 and prospectively from 1995 to 2000. Various thrombotic microangiopathic presentations were identified in these patients. Their response to exchange plasmapheresis was evaluated, and their clinical outcome was determined. RESULTS A total of 74 patients were diagnosed with TM. Among these patients, several well-defined thrombotic microangiopathic presentations were identified. These presentations included TTP in 57 patients, acute respiratory distress syndrome (ARDS) in 13 patients, HUS in 9 patients, the syndrome in which hemolysis, elevated liver enzymes, and low platelet count are found in association with pregnancy in 9 patients, peripheral digit ischemic syndrome (PDIS) in 6 patients, pancreatitis in 3 patients, hepatitis in 3 patients, and nonocclusive mesenteric ischemia (NOMI) in 2 patients. Exchange plasmapheresis was an effective treatment, with a response rate of 79%. A poor prognosis was evident when ARDS was present, with an overall survival rate of 46%. CONCLUSION Traditionally, TTP and HUS are considered the main entities of TM. It is evident that other manifestations of TM, if unrecognized in a timely fashion, can lead to fatality. The understanding of the pathophysiologic consequences of TM and the recognition of its atypical presentations are essential to achieve favorable outcomes in patients with this life-threatening disease.
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Affiliation(s)
- Jae C Chang
- Department of Medicine, Wright State University School of Medicine, and Good Samaritan Hospital, Dayton, Ohio 45406, USA.
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Kfoury Baz EM, Mikati ARA, Kanj NA. Reactive hemophagocytic syndrome associated with thrombotic thrombocytopenic purpura during therapeutic plasma exchange. Ther Apher Dial 2002; 6:159-62. [PMID: 11982958 DOI: 10.1046/j.1526-0968.2002.00362.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Hemophagocytic lymphohistiocytosis (HLH) is characterized by fever, cytopenia, splenomegaly, and lymphohistiocytic proliferation with hemophagocytosis. Sporadic, familial, and reactive HLH varieties exist. The latter, also termed the reactive hemophagocytic syndrome (RHS), has been associated with a variety of infectious and noninfectious etiologies. Activation of monocytes in RHS is due to stimulation by high levels of activating cytokines. RHS has not been associated previously with thrombotic thrombocytopenic purpura (TTP). TTP is a multisystem disorder characterized by consumptive thrombocytopenia, microangiopathic hemolytic anemia, neurologic symptoms, renal impairment, and fever. We report on a 33 year old male patient with a classic picture of TTP who initially responded to therapeutic plasma exchange but then became refractory to treatment and developed RHS. It is likely that a specific pathophysiology involving the activation of neutrophils during TPE is present for the development of cytokine-induced hemophagocytosis during TTP treatment. The consequent development of RHS possibly caused early TTP relapse.
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Sasahara Y, Kumaki S, Ohashi Y, Minegishi M, Kano H, Bessho F, Tsuchiya S. Deficient activity of von Willebrand factor-cleaving protease in patients with Upshaw-Schulman syndrome. Int J Hematol 2001; 74:109-14. [PMID: 11530799 DOI: 10.1007/bf02982559] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
We identified unusually large von Willebrand factor (vWF) multimers caused by deficient activity of vWF-cleaving protease in 2 patients with Upshaw-Schulman syndrome. The autoantibodies that inhibited the protease activity were not detected in the plasma of either patient. Periodic fresh-frozen plasma transfusion was effective for management of the hemolysis and thrombocytopenia. We detected enriched enzyme activity in a particular plasma fraction, although molecular cloning of this specific protease is needed to determine a more detailed pathogenesis and to develop new therapeutic approaches.
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Affiliation(s)
- Y Sasahara
- Department of Pediatric Oncology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Miyagi, Japan
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Fontana S, Gerritsen HE, Kremer Hovinga J, Furlan M, Lämmle B. Microangiopathic haemolytic anaemia in metastasizing malignant tumours is not associated with a severe deficiency of the von Willebrand factor-cleaving protease. Br J Haematol 2001; 113:100-2. [PMID: 11328288 DOI: 10.1046/j.1365-2141.2001.02704.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Complete deficiency of von Willebrand factor-cleaving protease (VWF-cp) has recently been identified as a pathogenetically important factor for thrombotic thrombocytopenic purpura (TTP). Microangiopathic haemolytic anaemia (MAHA) with thrombocytopenia in patients with metastasizing neoplasms is clinically similar to TTP, however, the pathogenesis of the condition is unclear. Partial deficiency of VWF-cp in metastasizing malignancy has recently been reported in patients without MAHA. Our study shows normal or subnormal VWF-cp activity in four patients with metastasizing neoplasia-associated MAHA but, in contrast to classical TTP, no complete deficiency of VWF-cp despite the full clinical picture of MAHA.
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Affiliation(s)
- S Fontana
- Central Haematology Laboratory, University Hospital, Inselspital, Bern, Switzerland.
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Abstract
Inflammatory bowel disease is often associated with hematologic abnormalities such as anemia, leukocytosis, and thrombocytosis. We report for the first time an unusual case of ulcerative colitis complicated by thrombotic thrombocytopenic purpura. Severe lower gastrointestinal bleeding resolved with subtotal colectomy, but the thrombotic thrombocytopenic purpura proved unresponsive to medical treatment. Splenectomy and completion proctectomy were performed, ultimately resulting in a successful outcome.
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Affiliation(s)
- G Almogy
- Department of Surgery, Mount Sinai Hospital, New York 10029, USA
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von Bubnoff N, Sandherr M, Schneller F, Peschel C. Thrombotic thrombocytopenic purpura in metastatic carcinoma of the breast. Am J Clin Oncol 2000; 23:74-7. [PMID: 10683084 DOI: 10.1097/00000421-200002000-00021] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We present a case of a 52-year-old woman with thrombotic thrombocytopenic purpura associated with progressive metastatic adenocarcinoma of the breast. The patient received plasma exchange therapy. Thrombocytopenic purpura resolved 2 months after discontinuation of plasma exchange while the patient received chemotherapy. After 3 more months, a fulminant relapse of the thrombocytopenic purpura developed, and there were signs of tumor progression. She died despite adequate treatment. We conclude that effective treatment of the underlying tumor can be crucial to control cancer-associated thrombocytopenic purpura.
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Affiliation(s)
- N von Bubnoff
- Medizinische Klinik und Poliklinik der Technischen Universität, Munich, Germany
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Kfoury Baz EM, Mahfouz RA, Masri AF. Thrombotic thrombocytopenic purpura in a patient with rheumatoid arthritis treated by plasmapheresis. THERAPEUTIC APHERESIS : OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY FOR APHERESIS AND THE JAPANESE SOCIETY FOR APHERESIS 1999; 3:314-6. [PMID: 10608725 DOI: 10.1046/j.1526-0968.1999.00166.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Thrombotic thrombocytopenic purpura (TTP) is a multisystem disorder characterized by consumptive thrombocytopenia, microangiopathic hemolytic anemia, and neurologic symptoms. TTP is associated with many diseases and several therapeutic drugs. We report the rare case of a patient with rheumatoid arthritis who developed TTP that was not associated with drug therapy, 18 months after the onset of rheumatoid arthritis. She recovered from the TTP following daily sessions of therapeutic plasma exchange (TPE) with fresh frozen plasma replacement and glucocorticoid therapy. Recent pathogenic mechanisms are reviewed as they relate to von Willebrand factor. In this report of the rare association of TTP with rheumatoid arthritis, an immediate relationship is likely because both are of an immune nature. Awareness of the possible development of TTP in rheumatoid arthritis is important for early diagnosis and treatment.
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Affiliation(s)
- E M Kfoury Baz
- Department of Pathology and Laboratory Medicine, American University of Beirut Medical Center, Lebanon.
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Esplin MS, Branch DW. Diagnosis and management of thrombotic microangiopathies during pregnancy. Clin Obstet Gynecol 1999; 42:360-7. [PMID: 10370854 DOI: 10.1097/00003081-199906000-00020] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- M S Esplin
- University of Utah School of Medicine, Salt Lake City 84132, USA.
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