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Seidizadeh O, Baronciani L, Pagliari MT, Cozzi G, Colpani P, Cairo A, Siboni SM, Biguzzi E, Peyvandi F. Genetic determinants of enhanced von Willebrand factor clearance from plasma. JOURNAL OF THROMBOSIS AND HAEMOSTASIS : JTH 2023; 21:1112-1122. [PMID: 36754679 DOI: 10.1016/j.jtha.2023.01.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 01/02/2023] [Accepted: 01/11/2023] [Indexed: 01/21/2023]
Abstract
BACKGROUND Enhanced von Willebrand factor (VWF) clearance from plasma is associated with von Willebrand disease (VWD). However, the genetic background of this disease mechanism is not well defined. OBJECTIVE To determine VWF variants that are associated with reduced VWF survival. METHODS Two hundred fifty-four patients with VWD (type 1 = 50 and type 2 = 204) were investigated, and the results were compared with 120 healthy controls. The patients were comprehensively characterized for phenotypic and genetic features. The ratio of VWF propeptide (VWFpp)/VWF antigen (VWFpp ratio) was used to establish in each patient the VWF clearance state. RESULTS Out of 92 variants associated with type 1 (7 were novel) and type 2 VWD, 19 had a VWFpp ratio ranging from 1.7 to 2.2, 24 had a VWFpp ratio between 2.3 and 2.9, and 24 variants had a ratio of ≥3. The VWFpp median ratio in healthy controls was 0.98 (0.55-1.6) so that a cut-off value of >1.6 was considered an indicator of accelerated VWF clearance from plasma. An enhanced VWF clearance was observed in 34% of type 1 cases, 100% of type 1 Vicenza cases, 81% of 2A cases, 77% of 2B cases, 88% of 2M cases, and 36% of 2N cases. CONCLUSIONS An accelerated VWF clearance was found in most patients with type 2A, 2B, and 2M VWD, with a lower proportion of type 1 and 2N. Sixty-seven different variants alone or in combination with other variants were associated with an increased VWFpp ratio. The variants with the highest VWFpp ratio were mostly located in the D3-A1 VWF domains.
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Affiliation(s)
- Omid Seidizadeh
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy; Università degli Studi di Milano, Department of Pathophysiology and Transplantation, Milan, Italy
| | - Luciano Baronciani
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy
| | - Maria Teresa Pagliari
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy
| | - Giovanna Cozzi
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy
| | - Paola Colpani
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy
| | - Andrea Cairo
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy
| | - Simona Maria Siboni
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy
| | - Eugenia Biguzzi
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy
| | - Flora Peyvandi
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy; Università degli Studi di Milano, Department of Pathophysiology and Transplantation, Milan, Italy.
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Bruno L, Lenberg J, Le D, Dimmock D, Thornburg CD, Briggs B. Novel Approach to Improve the Identification of the Bleeding Phenotype in Noonan Syndrome and Related RASopathies. J Pediatr 2023:S0022-3476(23)00019-7. [PMID: 36646249 DOI: 10.1016/j.jpeds.2022.12.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 11/10/2022] [Accepted: 12/01/2022] [Indexed: 01/14/2023]
Abstract
OBJECTIVES To characterize bleeding phenotype in Noonan Syndrome, to test the utility of following national guidelines in detecting this phenotype, to evaluate thromboelastography (TEG) as a diagnostic tool and to evaluate the cohort for genotype-phenotype correlations. STUDY DESIGN Participants with a clinical diagnosis NS or related RASopathy were enrolled in a cohort study. Study procedures included clinical bleeding assessment, coagulation testing per guidelines and hematology consultation. TEG was completed in a subset and genetic testing was conducted for those without a molecular diagnosis. International Society of Haemostasis and Thrombosis Bleeding Assessment Tool (ISTH-BAT) scores were calculated with hematology consultation. Bleeding phenotype was defined as abnormal bleeding score. RESULTS Twenty participants enrolled; 12completed clinical and laboratory evaluation, five of whom met the definition for bleeding phenotype. Four of the five participants with a bleeding phenotype had platelet aggregation defects and at least one additional coagulation defect. TEG was performed in nine participants, four with bleeding phenotype and five without, and results were normal in all cases. No genotype-phenotype correlation was found. CONCLUSION Five of 20 participants had a bleeding phenotype identified. Based on available data we do not recommend incorporating TEG into clinical practice for NS patients. Platelet aggregation defects were the most common abnormalities, which would not be detected on Tier 1 testing of current guidelines, therefore we propose a new algorithm.
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Affiliation(s)
- Leah Bruno
- Department of Pediatrics, Division of Hematology and Oncology, University of California San Diego, La Jolla, California; Rady Children's Institute of Genomic Medicine, San Diego, California
| | - Jerica Lenberg
- Rady Children's Institute of Genomic Medicine, San Diego, California
| | - Dzung Le
- Department of Pathology, University of California San Diego, La Jolla, California
| | - David Dimmock
- Rady Children's Institute of Genomic Medicine, San Diego, California
| | - Courtney D Thornburg
- Department of Pediatrics, Division of Hematology and Oncology, University of California San Diego, La Jolla, California; Hemophilia and Thrombosis Treatment Center, Rady Children's Hospital San Diego, San Diego, California
| | - Benjamin Briggs
- Rady Children's Institute of Genomic Medicine, San Diego, California.
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Kalvehalli Kashinath S, Kouides PA. The diagnosis, natural history, and management of von Willebrand disease in women in the age of guidelines. Expert Rev Hematol 2023:1-16. [PMID: 36609196 DOI: 10.1080/17474086.2023.2166925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
INTRODUCTION Women and girls with bleeding disorders face multiple bleeding challenges throughout their life. The most significant morbidity and mortality are due to heavy menstrual bleeding and postpartum hemorrhage in their reproductive years. The ASH/ISTH/NHF/WFH 2021 guidelines on diagnosing and managing von Willebrand disease (VWD) provide several new updates. AREAS COVERED Women with VWD have a higher prevalence of heavy menstrual bleeding. The subpopulation of adolescents is particularly vulnerable, as the diagnosis is often delayed with increased comorbidity of iron deficiency anemia and associated symptoms. A detailed review is done on the prevalence of bleeding-related complications, especially heavy menstrual bleeding (HMB) and post-partum hemorrhage (PPH). The management strategies are also reviewed in detail, with a specific focus on the target factor levels and the use of antifibrinolytics. EXPERT OPINION The 2021 ASH/ISTH/NHF/WFH diagnostic and management recommendations are reviewed with a specific focus on hormonal methods of HMB management and antifibrinolytics in this situation. The reviewed topics include neuraxial anesthesia, factor cutoff, and tranexamic acid use in the postpartum period.
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Affiliation(s)
- Sanjana Kalvehalli Kashinath
- Department of Hematology Oncology, Mary M. Gooley Hemophilia Center, Inc., The Rochester General Hospital, 14621, Rochester, NY, USA
| | - Peter A Kouides
- Department of Hematology Oncology, Mary M. Gooley Hemophilia Center, Inc., The Rochester General Hospital, 14621, Rochester, NY, USA.,Department of Hematology Oncology, University of Rochester School of Medicine, Rochester, NY, USA
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Seidizadeh O, Peyvandi F. Laboratory Testing for von Willebrand Factor Activity by a Glycoprotein Ib-Binding Assay (VWF:GPIbR): HemosIL von Willebrand Factor Ristocetin Cofactor Activity on ACL TOP ®. Methods Mol Biol 2023; 2663:669-677. [PMID: 37204744 DOI: 10.1007/978-1-0716-3175-1_44] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
von Willebrand disease (VWD) is a lifelong and common inherited bleeding disorder caused by a quantitative deficiency and/or qualitative defect of von Willebrand factor (VWF). In order to establish the correct diagnosis of VWD, various tests must be conducted, including evaluation of factor VIII activity (FVIII:C), VWF antigen (VWF:Ag), and VWF functional activity. The platelet-dependent VWF activity is measured in different ways, with the historical ristocetin cofactor assay (VWF:RCo) using platelet aggregometry now replaced with newer assays that offer better precision, lower limits of detection, low coefficient of variation, and are fully automated. The VWF activity by glycoprotein Ib-binding assays (VWF:GPIbR) measured on the ACL TOP® platform represents an automated assay that instead of using platelets employs latex beads coated with recombinant wild-type GPIb. VWF in the test sample agglutinates the polystyrene beads coated with GPIb in the presence of ristocetin. The reduction of turbidity as beads agglutinate represents a linear relationship with VWF:GPIbR activity. Using a ratio of VWF:GPIbR/VWF:Ag, the VWF:GPIbR assay also provides good sensitivity and specificity for distinguishing type 1 VWD from type 2. The following chapter describes a detailed protocol for the VWF:GPIbR assay.
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Affiliation(s)
- Omid Seidizadeh
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy
| | - Flora Peyvandi
- Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Milan, Italy.
- Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy.
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Rhoades R, French Z, Yang A, Walsh K, Drelich DA, McKenzie SE. Perioperative Outcomes of Patients with Bleeding Disorders Undergoing Major Surgery at an Academic Hemophilia Treatment Center. Clin Appl Thromb Hemost 2023; 29:10760296231165056. [PMID: 36972481 PMCID: PMC10052468 DOI: 10.1177/10760296231165056] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023] Open
Abstract
Persons with bleeding disorders (PwBD) are at high risk for bleeding with invasive procedures. However, the risk of bleeding in PwBD undergoing major surgery and outcomes of patients managed perioperatively at a hemophilia treatment center (HTC) are not well described. We performed a retrospective review of surgical outcomes among PwBD undergoing major surgery between January 1st, 2017 and December 31st, 2019 at the Cardeza Foundation Hemophilia and Thrombosis Center in Philadelphia, PA. The primary outcome was postoperative bleeding, assessed according to the ISTH-SSC's 2010 definition. Secondary outcomes included use of unplanned postoperative hemostatic therapy, LOS, and 30-day readmission rate. Results were compared to non-PwBD population from a surgical database, matched for surgery, age, and sex. During the study period, 50 PwBD underwent 63 major surgeries. The most common diagnoses were VWD (64%) and hemophilia A (20.0%). The most common surgical procedure category was orthopedic (33.3%), predominantly arthroplasties. Postoperatively,4.8% of procedures were complicated by major bleeding and 1.6% by non-major bleeding. The mean LOS was 1.65 days, and 30-day readmission rate was 1.6%. In comparison to matched, non-PwBD patients in a national surgical database undergoing the same procedures, study patients had a similar rate of bleeding complications per procedure (5.0% vs 1.04% P = .071, Fisher's exact test). PwBD undergoing major surgeries have low rates of major bleeding when receiving comprehensive care at an HTC. Bleeding and hospital readmission rates were similar to non-PwBD baseline in a large database.
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Affiliation(s)
- Ruben Rhoades
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, 6559Thomas Jefferson University, Philadelphia, PA, USA
| | - Zachary French
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, 6559Thomas Jefferson University, Philadelphia, PA, USA
| | - Amy Yang
- College of Population Health, Thomas Jefferson University, Philadelphia, PA, USA
| | | | - Douglass A Drelich
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, 6559Thomas Jefferson University, Philadelphia, PA, USA
- CSL Behring, King of Prussia, PA, USA
| | - Steven E McKenzie
- Division of Hematology, Department of Medicine, Cardeza Foundation for Hematologic Research, 6559Thomas Jefferson University, Philadelphia, PA, USA
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Salazar E, Higgins RA. Automation in the Thrombosis and Hemostasis Laboratory. Methods Mol Biol 2023; 2663:51-62. [PMID: 37204703 DOI: 10.1007/978-1-0716-3175-1_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Automation continues to advance into hemostasis and thrombosis laboratories. Integration of hemostasis testing into an existing chemistry track systems and adoption of a separate hemostasis track systems are important considerations. Unique issues must be addressed to maintain quality and efficiency when automation is introduced. Among other challenges, this chapter discusses centrifugation protocols, incorporation of specimen-check modules in the workflow, and inclusion of tests amenable to automation.
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Affiliation(s)
- Eric Salazar
- University of Texas Health Science Center San Antonio, San Antonio, TX, USA.
| | - Russell A Higgins
- University of Texas Health Science Center San Antonio, San Antonio, TX, USA
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Favaloro EJ, Mohammed S, Vong R, Pasalic L. Laboratory Testing for von Willebrand Disease Using a Composite Rapid 3-Test Chemiluminescence-Based von Willebrand Factor Assay Panel. Methods Mol Biol 2023; 2663:647-667. [PMID: 37204743 DOI: 10.1007/978-1-0716-3175-1_43] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
von Willebrand disease (VWD) is the most commonly reported inherited bleeding disorder and may alternatively occur as an acquired von Willebrand syndrome (AVWS). VWD/AVWS develops from defects and/or deficiency in the adhesive plasma protein von Willebrand factor (VWF). VWD/AVWS diagnosis/exclusion remains challenging because of the heterogeneity of VWF defects and the technical limitations of many VWF tests, as well as the VWF test panels (number and type of tests) chosen by many laboratories. Laboratory testing for these disorders utilizes evaluation of VWF level and activity, with activity assessment needing several tests due to the many functions performed by VWF in order to help counteract bleeding. This report explains procedures for evaluating VWF level (antigen; VWF:Ag) and activity by means of a chemiluminescence-based panel. Activity assays comprise collagen binding (VWF:CB) and a ristocetin-based recombinant glycoprotein Ib-binding (VWF:GPIbR) assay that reflects a contemporary alternative to classical ristocetin cofactor (VWF:RCo). This 3-test VWF panel (Ag, CB, GPIbR [RCo]) reflects the only such composite panel available on a single platform and is performed on an AcuStar instrument (Werfen/Instrumentation Laboratory). Certain regional approvals may also allow this 3-test VWF panel to be performed on the BioFlash instrument (Werfen/Instrumentation Laboratory).
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Affiliation(s)
- Emmanuel J Favaloro
- School of Medical Sciences, Faculty of Medicine and Health University of Sydney, Westmead Hospital, Westmead, NSW, Australia.
- School of Dentistry and Medical Sciences, Faculty of Science and Health, Charles Sturt University, Wagga, Wagga, NSW, Australia.
| | - Soma Mohammed
- Department of Haematology, Institute of Clinical Pathology and Medical Research (ICPMR), NSW Health Pathology, Westmead Hospital, Westmead, NSW, Australia
| | - Ronny Vong
- Department of Haematology, Institute of Clinical Pathology and Medical Research (ICPMR), NSW Health Pathology, Westmead Hospital, Westmead, NSW, Australia
| | - Leonardo Pasalic
- Department of Haematology, Institute of Clinical Pathology and Medical Research (ICPMR), NSW Health Pathology, Westmead Hospital, Westmead, NSW, Australia
- Sydney Centres for Thrombosis and Haemostasis, Westmead, NSW, Australia
- Westmead Clinical School, Sydney University, Westmead, NSW, Australia
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108
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Favaloro EJ, Mohammed S, Vong R, Pasalic L. Laboratory Testing for von Willebrand Factor: Factor VIII Binding for the Diagnosis or Exclusion of Type 2N von Willebrand Disease: An Update. Methods Mol Biol 2023; 2663:679-691. [PMID: 37204745 DOI: 10.1007/978-1-0716-3175-1_45] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
von Willebrand factor (VWF) is a large adhesive plasma protein that expresses several functional activities. One of these activities is to bind coagulation factor VIII (FVIII) and to protect it from degradation. Deficiency of, and/or defects in, VWF can give rise to a bleeding disorder called von Willebrand disease (VWD). The defect in VWF that affects its ability to bind to and protect FVIII is captured within type 2N VWD. In these patients, FVIII is produced normally; however, plasma FVIII quickly degrades as it is not bound to and protected by VWF. These patients phenotypically resemble those with hemophilia A, where instead, FVIII is produced in lower amount. Both hemophilia A and 2N VWD patients therefore present with reduced levels of plasma FVIII relative to VWF level. However, therapy differs, since patients with hemophilia A are given FVIII replacement products, or FVIII mimicking products; instead, patients with 2N VWD require VWF replacement therapy, since FVIII replacement will only be effective for a short term, given this replacement product will quickly degrade in the absence of functional VWF. Thus, 2N VWD needs to be differentiated from hemophilia A. This can be achieved by genetic testing or by use of a VWF:FVIII binding assay. The current chapter provides a protocol for the performance of a commercial VWF:FVIII binding assay.
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Affiliation(s)
- Emmanuel J Favaloro
- School of Medical Sciences, Faculty of Medicine and Health University of Sydney, Westmead Hospital, Westmead, NSW, Australia.
- School of Dentistry and Medical Sciences, Faculty of Science and Health, Charles Sturt University, Wagga, Wagga, NSW, Australia.
| | - Soma Mohammed
- Department of Haematology, Institute of Clinical Pathology and Medical Research (ICPMR), NSW Health Pathology, Westmead Hospital, Westmead, NSW, Australia
| | - Ronny Vong
- Department of Haematology, Institute of Clinical Pathology and Medical Research (ICPMR), NSW Health Pathology, Westmead Hospital, Westmead, NSW, Australia
| | - Leonardo Pasalic
- Department of Haematology, Institute of Clinical Pathology and Medical Research (ICPMR), NSW Health Pathology, Westmead Hospital, Westmead, NSW, Australia
- Sydney Centres for Thrombosis and Haemostasis, Westmead, NSW, Australia
- Westmead Clinical School, Sydney University, Westmead, NSW, Australia
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Du P, Bergamasco A, Moride Y, Truong Berthoz F, Özen G, Tzivelekis S. Von Willebrand Disease Epidemiology, Burden of Illness and Management: A Systematic Review. J Blood Med 2023; 14:189-208. [PMID: 36891166 PMCID: PMC9987238 DOI: 10.2147/jbm.s389241] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 01/06/2023] [Indexed: 03/06/2023] Open
Abstract
Introduction Although hereditary von Willebrand disease (VWD) is the most common bleeding disorder, its epidemiology is not well understood. A systematic review (PROSPERO CRD42020197674/CRD42021244374) on the epidemiology/burden of illness of VWD was conducted to better understand patients' unmet needs. Methods Observational studies (published January 1, 2010 to April 14, 2021) were identified in MEDLINE and Embase databases, using free-text keywords and thesaurus terms for VWD and outcomes of interest. Pragmatic web-based searches of the gray literature, including conference abstracts, were performed, and reference lists of retained publications were manually searched for additional sources. Case reports and clinical trials (phase 1-3) were excluded. Outcomes of interest were incidence, prevalence, mortality, patient characteristics, burden of illness, and therapeutic management/treatments currently used for VWD. Results Of the 3095 identified sources, 168 were included in this systematic review. Reported VWD prevalence (22 sources) ranged from 108.9 to 2200 per 100,000 in population-based studies and from 0.3 to 16.5 per 100,000 in referral-based studies. Reported times between first symptom onset and diagnosis (two sources; mean 669 days; median 3 years) highlighted gaps in timely VWD diagnosis. Bleeding events reported in 72-94% of the patients with VWD (all types; 27 sources) were mostly mucocutaneous including epistaxis, menorrhagia, and oral/gum bleeding. Poorer health-related quality of life (three sources) and greater health care resource utilization (three sources) were reported for patients with VWD than in general populations. Conclusion Available data suggest that patients with VWD experience high disease burden in terms of bleeding, poor quality of life, and health care resource utilization.
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Affiliation(s)
- Ping Du
- Takeda Development Center Americas, Inc., Cambridge, MA, USA
| | | | - Yola Moride
- YOLARX Consultants, Paris, France.,Rutgers, The State University of New Jersey, New Brunswick, NJ, USA
| | | | - Gülden Özen
- Takeda Development Center Americas, Inc., Cambridge, MA, USA
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Gosselin RC. Preanalytical Variables in Hemostasis Testing. Methods Mol Biol 2023; 2663:39-50. [PMID: 37204702 DOI: 10.1007/978-1-0716-3175-1_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Hemostasis testing performed in clinical laboratories are critical for assessing hemorrhagic and thrombotic disorders. The assays performed can be used to provide the information required for diagnosis, risk assessment, efficacy of therapy, and therapeutic monitoring. As such, hemostasis tests should be performed to the highest level of quality, including the standardization, implementation, and monitoring of all phases of the testing, which include the preanalytical, analytical, and post-analytical phases. It is well established that the preanalytical phase is the most critical component of the testing process, being the hands-on activities, including patient preparation for blood collection, as well as the actual blood collection, including sample identification and the post-collection handling to include sample transportation, processing, and storage of samples when testing is not performed immediately. The purpose of this article is to provide an update to the previous edition of coagulation testing-related preanalytical variables (PAV) and, when properly addressed and performed, can reduce the most common causes of errors in the hemostasis laboratory.
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Affiliation(s)
- Robert C Gosselin
- Hemostasis & Thrombosis Center, University of California, Davis Health System, Sacramento, CA, USA
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111
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Favaloro EJ, Gosselin RC, Pasalic L, Lippi G. Post-analytical Issues in Hemostasis and Thrombosis Testing: An Update. Methods Mol Biol 2023; 2663:787-811. [PMID: 37204753 DOI: 10.1007/978-1-0716-3175-1_53] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
There are typically three phases identified as contributing to the total testing process. The preanalytical phase starts with the clinician and the patient, when laboratory testing is being considered. This phase also includes decisions about which tests to order (or not), patient identification, blood collection, blood transport, sample processing, and storage to name a few. There are many potential failures that may occur in this preanalytical phase, and these are the topic of another chapter in this book. The second phase, the analytical phase, represents the performance of the test, which is essentially covered in various protocols in this book and the previous edition. The third is the post-analytical phase, which is what occurs after sample testing, and is the topic of the current chapter. Post-analytical issues are generally related to reporting and interpretation of test results. This chapter provides a brief description of these events, as well as guidance for preventing or minimizing post-analytical issues. In particular, there are several strategies for improved post-analytical reporting of hemostasis assays, with this providing the final opportunity to prevent serious clinical errors in patient diagnosis or management.
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Affiliation(s)
- Emmanuel J Favaloro
- School of Medical Sciences, Faculty of Medicine and Health University of Sydney, Westmead Hospital, Westmead, NSW, Australia.
- School of Dentistry and Medical Sciences, Faculty of Science and Health, Charles Sturt University, Wagga, Wagga, NSW, Australia.
| | - Robert C Gosselin
- Hemostasis & Thrombosis Center, University of California, Davis Health System, Sacramento, CA, USA
| | - Leonardo Pasalic
- Department of Haematology, Sydney Centres for Thrombosis and Haemostasis, Institute of Clinical Pathology and Medical Research (ICPMR), NSW Health Pathology, Westmead Hospital, Westmead, NSW, Australia
- Westmead Clinical School, University of Sydney, Westmead, NSW, Australia
| | - Giuseppe Lippi
- Section of Clinical Biochemistry, University of Verona, Verona, Italy
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Miljic P, Noureldin A, Lavin M, Kazi S, Sanchez-Luceros A, James PD, Othman M. Challenges in the management of women with type 2B von Willebrand disease during pregnancy and the postpartum period: evidence from literature and data from an international registry and physicians' survey-communication from the Scientific and Standardization Committees of the International Society on Thrombosis and Haemostasis. J Thromb Haemost 2023; 21:154-163. [PMID: 36695378 DOI: 10.1016/j.jtha.2022.10.019] [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: 05/02/2022] [Revised: 10/11/2022] [Accepted: 10/12/2022] [Indexed: 01/11/2023]
Abstract
BACKGROUND Management of women with type 2B von Willebrand disease (VWD) during pregnancy is challenging because of dysfunctional von Willebrand factor (VWF) and the complexity resulting from discrepant VWF/factor VIII (VWF/FVIII) levels, impaired platelet-dependent VWF activity, progressive thrombocytopenia, and risks associated with the use of desmopressin. There is a lack of high-quality evidence to support clinical decision making. OBJECTIVES In this study, we examined the current diagnostic and management approaches and outcomes in women with VWD during pregnancy. METHODS Data were collected via 3 avenues: literature review, an international registry, and an international survey on physicians' practices for the management of pregnancy in women with VWD. The registry and survey were supported by the International Society on Thrombosis and Haemostasis. RESULTS Data on clinical and laboratory features, management and bleeding complications, and pregnancy outcomes of a total of 55 pregnancies from 49 women across the globe (literature: 35, registry: 20) and data reported by 112 physicians were analyzed. We describe the largest dataset on pregnancies in women with type 2B VWD available to date. The data highlight the following key issues: a) bleeding complications remain a concern in these patients, b) the target safe VWF level and the ideal monitoring approach are unknown, c) there is a wide range of hemostatic management practices in the type and timing of treatment, and d) physicians have diverse views on the mode of delivery and use of neuraxial anesthesia. CONCLUSION We conclude that an international consensus and guidance are critically required for better care and improved outcomes in this patient cohort.
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Affiliation(s)
- Predrag Miljic
- Clinic of Haematology, University Clinical Center of Serbia, Belgrade, Serbia; Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Abdelrahman Noureldin
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, Canada
| | - Michelle Lavin
- National Coagulation Centre, St. James' Hospital, Dublin, Ireland
| | - Sajida Kazi
- Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
| | | | - Paula D James
- Division of Hematology, Department of Medicine, Queen's University, Kingston, Ontario, Canada
| | - Maha Othman
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, Canada; School of Baccalaureate Nursing, St. Lawrence College, Kingston, Ontario, Canada; Clinical Pathology Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt.
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Seaman CD. Von Willebrand Disease in Older Patients: A Retrospective Electronic Health Record Review. Clin Appl Thromb Hemost 2022; 28:10760296221146740. [PMID: 36536550 PMCID: PMC9772937 DOI: 10.1177/10760296221146740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Von Willebrand disease (VWD) is often diagnosed as a consequence of symptoms experienced with hemostatic stressors, such as menstruation and childbirth. Thus, patients seeking medical care for VWD are generally younger. As a result, the natural course of VWD in older adults has not been well described. A retrospective electronic health record review was performed to provide a descriptive analysis of older VWD patients with at least one clinic visit at the Hemophilia Center of Western Pennsylvania (HCWP) between June 1, 2015, and May 31, 2021, and age 45 or older at the time of the visit. Data collected included VWD-related information, multimorbidity, and medications. Age-related change in von Willebrand factor (VWF) levels and the influence of multimorbidity on VWF levels were assessed. Seventy patients had 131 HCWP clinic visits. Hypertension, 34.3%, and osteoarthritis, 32.3%, were the most common multimorbidity-associated conditions. More than 33% of patients were receiving at least one antihemostatic medication. The most common bleeding symptom was ecchymosis, 22.9%. VWF antigen levels, 0.76 IU/mL, and the proportion of patients with normal VWF levels, 54.5%, increased with age to 0.99 IU/mL, p < 0.001, and 78.8%, p < 0.001, respectively. Multimorbidity did not predict change in VWF levels, p = 0.84. Of 62 invasive procedures performed, bleeding occurred in one of nine where VWD-specific therapy was omitted. These findings underscore the importance of describing the natural course of VWD in older adults, especially the critical nature of determining bleeding risk to guide clinical decision-making with the use of antihemostatic drugs and periprocedural VWD-specific therapy.
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Affiliation(s)
- Craig D. Seaman
- Department of Medicine, Division of Hematology/Oncology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA,Hemophilia Center of Western Pennsylvania, Pittsburgh, Pennsylvania, USA,Craig Seaman, Assistant Professor of Medicine, Division Hematology/Oncology, University of Pittsburgh, Associate Director, Hemophilia Center of Western Pennsylvania, 3636 Boulevard of the Allies, Pittsburgh, PA 15213-4306, USA.
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114
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Yang X, Zhang J, Lai Y, Yan X, Guo X, Han J, Liu J, Wang J, Zhu H. Acquired von Willebrand Syndrome Secondary to Normally Functioning Mechanical Aortic Valve and High-Output Cardiac State. J Cardiovasc Dev Dis 2022; 9:jcdd9120454. [PMID: 36547451 PMCID: PMC9786303 DOI: 10.3390/jcdd9120454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 12/04/2022] [Accepted: 12/09/2022] [Indexed: 12/14/2022] Open
Abstract
Acquired von Willebrand syndrome (AVWS) is caused by an acquired deficiency of von Willebrand factor (VWF), a multimeric protein required for primary hemostasis. For patients with heart valve diseases, high gradient across the malfunctioning valves could cause elevated shear stress and damage the most effective large VWF, eventually resulting in AVWS. However, AVWS has not been reported in association with normally functioning mechanical valves. Herein, we reported a 74-year-old female who suffered from recurrent gastrointestinal bleeding with a history of mechanical aortic and mitral valve replacement. This patient's function/antigen ratio of VWF was decreased and gel electrophoresis revealed the loss of large VWF, which confirmed the diagnosis of AVWS. Echocardiogram showed that the function of the prostheses was normal. However, the gradient across aortic valve was increased due to a high cardiac state which is secondary to chronic anemia, resulting in the disruption of large VWF multimers and exacerbation of gastrointestinal (GI) bleeding. After managing the patient's anemia with transfusion, the gradient across the aortic valve had improved, with the resolution of GI bleeding. This is the first case report of AVWS that is associated with a normally functioning mechanical valve. AVWS should be considered one of the differential diagnoses if patients present with unexplained GI bleeding on the background of having prosthetic heart valves. The management of the underlying condition is essential.
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Affiliation(s)
- Xinglin Yang
- Department of Cardiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Jinghong Zhang
- Central Clinical School, Monash University, Melbourne, VIC 3004, Australia
| | - Yamin Lai
- Department of Gastroenterology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Xuemin Yan
- Department of Gastroenterology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Xiaoxiao Guo
- Department of Cardiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Jianhua Han
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Jihai Liu
- Emergency Department, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Jiangshan Wang
- Emergency Department, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
- Correspondence:
| | - Huadong Zhu
- Emergency Department, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
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115
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What have we learned about the patient's experience of von Willebrand disease? A focus on women. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2022; 2022:631-636. [PMID: 36485077 PMCID: PMC9820129 DOI: 10.1182/hematology.2022000391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Von Willebrand disease (VWD), the most common inherited bleeding disorder (IBD), disproportionately affects females, given the hemostatic challenges they may encounter throughout their lifetimes. Despite this, research about VWD remains grossly underrepresented, particularly compared to hemophilia, which is historically diagnosed in males. Structural sexism, stigmatization of menstrual bleeding, delayed diagnosis, and a lack of timely access to care result in an increased frequency of bleeding events, iron deficiency, iron deficiency anemia, and a decreased quality of life. However, we are only beginning to recognize and acknowledge the magnitude of the burden of this disease. With an increasing number of studies documenting the experiences of women with IBDs and recent international guidelines suggesting changes to optimal management, a paradigm shift in recognition and treatment is taking place. Here, we present a fictional patient case to illustrate one woman's history of bleeding. We review the evidence describing the impact of VWD on quality of life, normalization of vaginal bleeding, diagnostic delays, and the importance of access to multidisciplinary care. Furthermore, we discuss considerations around reproductive decision-making and the intergenerational nature of bleeding, which often renders patients as caregivers. Through incorporating the patient perspective, we argue for an equitable and compassionate path to overcome decades of silence, misrecognition, and dismissal. This path moves toward destigmatization, open dialogue, and timely access to specialized care.
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116
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Diagnostic pitfalls and conundrums in type 1 von Willebrand disease. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2022; 2022:618-623. [PMID: 36485079 PMCID: PMC9821407 DOI: 10.1182/hematology.2022000389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Most people with von Willebrand disease (VWD) have a partial quantitative deficiency of plasma von Willebrand factor (VWF) or type 1 VWD. In contrast to type 2 and type 3 VWD, laboratory assays will not always establish the diagnosis in type 1 VWD. This is because plasma VWF levels in type 1 VWD, especially those with levels closer to 50 IU/dL, overlap with the general population. Assessment is further complicated by increased plasma VWF levels in response to physiologic stressors or aging. Diagnosis of those with type 1 VWD with plasma VWF levels 30 to 50 IU/dL (previously referred to as "low VWF") requires expert assessment of bleeding phenotype as well as an understanding of the limitations of both bleeding assessment tools (BATs) and laboratory testing. Using the available evidence and highlighting research gaps, we discuss common dilemmas facing providers relating to assessment of adolescents, transition from pediatrics to adult care, and older individuals with type 1 VWD.
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117
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Lapić I, Radić Antolic M, Rogić D, Dejanović Bekić S, Coen Herak D, Bilić E, Zadro R. Type 1 von Willebrand Disease in a Pediatric Patient Caused by a Novel Heterozygous Deletion of Exons 1 to 6 of the von Willebrand Factor Gene: A Case Report. Lab Med 2022:6873308. [DOI: 10.1093/labmed/lmac138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
Abstract
Abstract
A 6-year-old boy was referred to a hematologist due to excessive mucocutaneous bleeding. Diagnostic assessment for von Willebrand disease (VWD) was indicated and included both coagulation and genetic testing. Laboratory testing revealed proportionally decreased von Willebrand factor (VWF) glycoprotein Ib-binding activity (23.6%) compared to VWF antigen (24.7%), similarly decreased VWF collagen-binding activity (24.2%), and normally distributed VWF multimers, with decreased intensity of all fractions. Diagnosis of type 1 VWD was established. Genetic analysis by means of next-generation sequencing (NGS) of VWF and coagulation factor VIII genes did not identify any causative mutations. Additionally, multiplex ligation-dependent probe amplification (MLPA) of VWF gene exons revealed a heterozygous deletion of exons 1 to 6, which is reported in type 1 VWD for the first time. Application of MLPA was crucial for revealing the genetic basis of type 1 VWD in this case, which would have remained undetected if only NGS was used.
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Affiliation(s)
- Ivana Lapić
- Department of Laboratory Diagnostics, University Hospital Center Zagreb , Zagreb , Croatia
| | | | - Dunja Rogić
- Department of Laboratory Diagnostics, University Hospital Center Zagreb , Zagreb , Croatia
- Faculty of Pharmacy and Biochemistry, University of Zagreb , Zagreb , Croatia
| | - Sara Dejanović Bekić
- Referral Center for Pediatrics Hematology and Oncology, Department of Pediatrics, University Hospital Center Zagreb , Zagreb , Croatia
| | - Désirée Coen Herak
- Department of Laboratory Diagnostics, University Hospital Center Zagreb , Zagreb , Croatia
| | - Ernest Bilić
- Referral Center for Pediatrics Hematology and Oncology, Department of Pediatrics, University Hospital Center Zagreb , Zagreb , Croatia
| | - Renata Zadro
- Medical Biochemistry Laboratory, St Catherine Specialty Hospital , Zagreb , Croatia
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118
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Kozlov S, Okhota S, Avtaeva Y, Melnikov I, Matroze E, Gabbasov Z. Von Willebrand factor in diagnostics and treatment of cardiovascular disease: Recent advances and prospects. Front Cardiovasc Med 2022; 9:1038030. [PMID: 36531725 PMCID: PMC9755348 DOI: 10.3389/fcvm.2022.1038030] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Accepted: 11/21/2022] [Indexed: 10/10/2023] Open
Abstract
Von Willebrand factor (VWF) is a large multimeric glycoprotein involved in hemostasis. It is essential for platelet adhesion to the subendothelium of the damaged endothelial layer at high shear rates. Such shear rates occur in small-diameter arteries, especially at stenotic sites. Moreover, VWF carries coagulation factor VIII and protects it from proteolysis in the bloodstream. Deficiency or dysfunction of VWF predisposes to bleeding. In contrast, an increase in the concentration of high molecular weight multimers (HMWM) of VWF is closely associated with arterial thrombotic events. Severe aortic stenosis (AS) or hypertrophic obstructive cardiomyopathy (HOCM) can deplete HMWM of VWF and lead to cryptogenic, gastrointestinal, subcutaneous, and mucosal bleeding. Considering that VWF facilitates primary hemostasis and a local inflammatory response at high shear rates, its dysfunction may contribute to the development of coronary artery disease (CAD) and its complications. However, current diagnostic methods do not allow for an in-depth analysis of this contribution. The development of novel diagnostic techniques, primarily microfluidic, is underway. Such methods can provide physiologically relevant assessments of VWF function at high shear rates; however, they have not been introduced into clinical practice. The development and use of agents targeting VWF interaction with the vessel wall and/or platelets may be reasonable in prevention of CAD and its complications, given the prominent role of VWF in arterial thrombosis.
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Affiliation(s)
- Sergey Kozlov
- Department of Problems of Atherosclerosis, National Medical Research Centre of Cardiology Named After Academician E.I. Chazov of the Ministry of Health of the Russian Federation, Moscow, Russia
| | - Sergey Okhota
- Department of Problems of Atherosclerosis, National Medical Research Centre of Cardiology Named After Academician E.I. Chazov of the Ministry of Health of the Russian Federation, Moscow, Russia
| | - Yuliya Avtaeva
- Laboratory of Cell Hemostasis, National Medical Research Centre of Cardiology Named After Academician E.I. Chazov of the Ministry of Health of the Russian Federation, Moscow, Russia
| | - Ivan Melnikov
- Laboratory of Cell Hemostasis, National Medical Research Centre of Cardiology Named After Academician E.I. Chazov of the Ministry of Health of the Russian Federation, Moscow, Russia
- Laboratory of Gas Exchange, Biomechanics and Barophysiology, State Scientific Center of the Russian Federation—The Institute of Biomedical Problems of the Russian Academy of Sciences, Moscow, Russia
| | - Evgeny Matroze
- Laboratory of Cell Hemostasis, National Medical Research Centre of Cardiology Named After Academician E.I. Chazov of the Ministry of Health of the Russian Federation, Moscow, Russia
- Department of Innovative Pharmacy, Medical Devices and Biotechnology, Moscow Institute of Physics and Technology, Moscow, Russia
| | - Zufar Gabbasov
- Laboratory of Cell Hemostasis, National Medical Research Centre of Cardiology Named After Academician E.I. Chazov of the Ministry of Health of the Russian Federation, Moscow, Russia
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119
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Toenges R, Steiner M. The Diagnostic Approach to Inherited Mild (to Moderate) Bleeding Disorders: A Current Perspective. Hamostaseologie 2022; 42:420-422. [PMID: 36549293 DOI: 10.1055/a-1946-6426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Affiliation(s)
- Rosa Toenges
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts, United States.,Goethe University Frankfurt, University Hospital, Dept. of Medicine, Hematology and Oncology, Frankfurt am Main, Germany
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120
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Vangenechten I, Smejkal P, Zavrelova J, Zapletal O, Wild A, Michiels JJ, Berneman Z, Blatny J, Batorova A, Prigancova T, Penka M, Gadisseur A. Analysis of von Willebrand Disease in the "Heart of Europe". TH OPEN: COMPANION JOURNAL TO THROMBOSIS AND HAEMOSTASIS 2022; 6:e335-e346. [PMID: 36299619 PMCID: PMC9581583 DOI: 10.1055/s-0042-1757635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 08/16/2022] [Indexed: 11/06/2022]
Abstract
Background
von Willebrand disease (VWD) is a genetic bleeding disorder caused by defects of von Willebrand factor (VWF), quantitative (type 1 and 3) or qualitative (type 2). The laboratory phenotyping is heterogenic making diagnosis difficult.
Objectives
Complete laboratory analysis of VWD as an expansion of the previously reported cross-sectional family-based VWD study in the Czech Republic (BRNO-VWD) and Slovakia (BRA-VWD) under the name “Heart of Europe,” in order to improve the understanding of laboratory phenotype/genotype correlation.
Patients and Methods
In total, 227 suspected VWD patients were identified from historical records. Complete laboratory analysis was established using all available assays, including VWF multimers and genetic analysis.
Results
A total of 191 patients (from 119 families) were confirmed as having VWD. The majority was characterized as a type 1 VWD, followed by type 2. Multimeric patterns concordant with laboratory phenotypes were found in approximately 83% of all cases. A phenotype/genotype correlation was present in 84% (77% type 1, 99% type 2, and 61% type 3) of all patients. Another 45 candidate mutations (23 novel variations), not found in the initial study, could be identified (missense 75% and truncating 24%). An exon 1–3 gene deletion was identified in 14 patients where no mutation was found by direct DNA sequencing, increasing the linkage up to 92%, overall.
Conclusion
This study provides a cross-sectional overview of the VWD population in a part of Central Europe. It is an addition to the previously published BRNO-VWD study, and provides important data to the International Society of Thrombosis and Haemostasis/European Association for Haemophilia and Allied Disorders VWD mutation database with identification of novel causal mutations.
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Affiliation(s)
- Inge Vangenechten
- Haemostasis Unit, Antwerp University Hospital, Edegem, Belgium,Medicine and Health Sciences, Haemostasis Research Unit, Antwerp University, Antwerp, Belgium,Antwerp University, Antwerp, Belgium,Address for correspondence Inge Vangenechten Department of Haematology, Haemostasis Unit, Antwerp University HospitalWilrijkstraat 10, B - 2650 EdegemBelgium
| | - Petr Smejkal
- Department of Clinical Haematology, University Hospital Brno, Brno, Czech Republic,Department of Laboratory Methods, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Jiri Zavrelova
- Department of Clinical Haematology, University Hospital Brno, Brno, Czech Republic,Department of Laboratory Methods, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Ondrej Zapletal
- Department of Pediatric Haematology, University Hospital Brno, Brno, Czech Republic
| | - Alexander Wild
- Department of Haematology, University F. D. Roosevelt Hospital, Banská Bystrica, Slovakia
| | - Jan Jacques Michiels
- Blood Coagulation and Vascular Medicine Center, Goodheart Institute & Foundation in Nature Medicine, Rotterdam, The Netherlands
| | - Zwi Berneman
- Antwerp University, Antwerp, Belgium,Department of Haematology, Antwerp University Hospital, Edegem, Belgium
| | - Jan Blatny
- Department of Pediatric Haematology, University Hospital Brno, Brno, Czech Republic
| | - Angelika Batorova
- National Hemophilia Center, Department of Haematology and Blood Transfusion of the Medical School of the Comenius University, Bratislava, Slovakia
| | - Tatiana Prigancova
- National Hemophilia Center, Department of Haematology and Blood Transfusion of the Medical School of the Comenius University, Bratislava, Slovakia
| | - Miroslav Penka
- Department of Clinical Haematology, University Hospital Brno, Brno, Czech Republic,Department of Laboratory Methods, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Alain Gadisseur
- Haemostasis Unit, Antwerp University Hospital, Edegem, Belgium,Medicine and Health Sciences, Haemostasis Research Unit, Antwerp University, Antwerp, Belgium,Antwerp University, Antwerp, Belgium,Department of Haematology, Antwerp University Hospital, Edegem, Belgium
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121
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Chen M, Shen MC, Chang SP, Ma GC, Huang YC, Lin CY. Origin and timing of de novo variants implicated in type 2 von Willebrand disease. J Cell Mol Med 2022; 26:5403-5413. [PMID: 36226571 PMCID: PMC9639050 DOI: 10.1111/jcmm.17563] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 08/30/2022] [Accepted: 09/11/2022] [Indexed: 12/03/2022] Open
Abstract
Very few studies have shown the real origin and timing of de novo variants (DNV) implicated in von Willebrand disease (VWD). We investigated four families with type 2 VWD. First, we conducted linkage analysis using single nucleotide variant genotyping to recognize the possible provenance of DNV. Second, we performed amplification refractory mutation system‐quantitative polymerase chain reaction to confirm the real origin of variant (~0% mutant cells) or presence of a genetic mosaic variant (0%–50% mutant cells) in three embryonic germ layer‐derived tissues and sperm cells. Then, three possible timings of DNV were categorized based on the relative likelihood of occurrence according to the number of cell divisions during embryogenesis. Two each with type 2B VWD (proband 1 p.Arg1308Cys, proband 4 p.Arg1306Trp) and type 2A VWD (proband 2 p.Leu1276Arg, proband 3 p.Ser1506Leu) were identified. Variant origins were identified for families 1, 2 and 3 and confirmed to originate from the mother, father and father, respectively. However, the father of family 4 was confirmed to have isolated germline mosaicism with 2.2% mutant sperm cells. Further investigation confirmed the paternal grandfather to be the origin of variant. Thus, we proposed that DNV originating from the two fathers most likely occurred at the single sperm cell, the one originating from the mother occurred at the zygote during the first few cellular divisions; alternatively, in family 4, the DNV most likely occurred at the early postzygotic development in the father. Our findings are essential for understanding genetic pathogenesis and providing accurate genetic counselling.
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Affiliation(s)
- Ming Chen
- Department of Genomic Medicine, Changhua Christian Hospital, Changhua, Taiwan.,Department of Obstetrics and Gynecology, National Taiwan University Hospital, Taipei, Taiwan
| | - Ming-Ching Shen
- Department of Internal Medicine, Changhua Christian Hospital, Changhua, Taiwan.,Department of Laboratory Medicine and Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Shun-Ping Chang
- Department of Genomic Medicine, Changhua Christian Hospital, Changhua, Taiwan
| | - Gwo-Chin Ma
- Department of Genomic Medicine, Changhua Christian Hospital, Changhua, Taiwan
| | - Ying-Chih Huang
- Department of Internal Medicine, Changhua Christian Hospital, Changhua, Taiwan
| | - Ching-Yeh Lin
- Department of Internal Medicine, Changhua Christian Hospital, Changhua, Taiwan
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122
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Eladly F, Miesbach W. Von Willebrand Disease—Specific Aspects in Women. Hamostaseologie 2022; 42:330-336. [DOI: 10.1055/a-1891-9976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
AbstractVon Willebrand disease (VWD) is the most common inherited bleeding disorder, which results from a deficiency or dysfunction of von Willebrand factor (VWF). The major symptoms of patients affected by VWD include mucocutaneous and gastrointestinal bleeding, easy bruising, and prolonged provoked bleeding due to injury or surgery. Although women and men are equally likely to be affected by VWD, women continue to be disproportionately affected by the bleeding challenges. Women with VWD suffer from sex-specific symptoms, such as menorrhagia, and are at higher risk of reproductive problems and recurrent miscarriage. Furthermore, pregnant women with VWD are more likely at higher risk of suffering from primary and secondary peripartal hemorrhage and anemia and the need for transfusions. Despite being affected by gynecologic and obstetrical bleeding, women face multiple barriers in obtaining an accurate diagnosis. This constitutes a problem that needs to be addressed, and early appropriate medical care should be ensured. There are several effective treatment options for women with VWD that can significantly improve their quality of life, including desmopressin, VWF concentrates, hormonal therapy, and antifibrinolytic therapy. During pregnancy, the monitoring of VWF activity levels is essential. The peripartal management depends on the type of VWD and on the measured levels of VWF levels and activity prior to delivery.
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Affiliation(s)
- Fagr Eladly
- Department of Medicine, Medical Clinic 2, Institute of Transfusion Medicine, University Hospital, Goethe University, Frankfurt, Germany
| | - Wolfgang Miesbach
- Department of Medicine, Medical Clinic 2, Institute of Transfusion Medicine, University Hospital, Goethe University, Frankfurt, Germany
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123
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Christopherson PA, Haberichter SL, Flood VH, Sicking UO, Abshire TC, Montgomery RR. Ristocetin dependent cofactor activity in von Willebrand disease diagnosis: Limitations of relying on a single measure. Res Pract Thromb Haemost 2022; 6:e12807. [PMID: 36381287 PMCID: PMC9637542 DOI: 10.1002/rth2.12807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 08/15/2022] [Accepted: 08/19/2022] [Indexed: 11/09/2022] Open
Abstract
Background Von Willebrand disease (VWD) is a common inherited bleeding disorder, however the diagnosis can be complicated by a subjective bleeding history and issues with some current von Willebrand factor (VWF) laboratory assays. Objectives In the Zimmerman Program, we sought to determine how often a type 1 diagnosis was based on a single low VWF ristocetin cofactor (VWF:RCo) level resulting from the common genetic variant p.D1472H or an isolated assay issue, if that low value was corroborated by the VWF glycoprotein-IbM (VWF:GPIbM) assay, and if retesting confirmed original levels. Methods New patients being evaluated for bleeding were consented. Analysis included VWF sequencing, bleeding scores, and comparisons of local VWF antigen (VWF:Ag) and VWF:RCo to central VWF:Ag and VWF:GPIbM. Results A total of 18% of VWD subjects had a low local VWF:RCo, but normal VWF:Ag and normal central testing including VWF:GPIbM. Seventy percent of the low VWF:RCo cohort had no pathogenic VWF variants; however, 33% carried p.D1472H. Low VWF:RCo subjects with follow-up local testing within 2 years showed those with p.D1472H continued to have low VWF:RCo and VWF:RCo/VWF:Ag ratio with normal VWF:GPIbM. Subjects without p.D1472H had an increase mean VWF:RCo, resulting in 59% with normal levels on repeat testing. Conclusions The diagnosis of VWD based on a single low VWF:RCo but normal VWF:Ag, was often attributed to p.D1472H or variability in VWF:RCo that was eliminated with VWF:GPIbM. Our study suggests that using VWF:RCo alone for diagnostic purposes may be insufficient while repeat VWF:RCo or VWF:GPIbM testing can be valuable in establishing a VWD diagnosis.
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Affiliation(s)
| | - Sandra L. Haberichter
- Versiti Blood Research InstituteMilwaukeeWisconsinUSA
- Division of Hematology/Oncology, Department of PediatricsMedical College of WisconsinMilwaukeeWisconsinUSA
- Children's Research Institute, Children's Hospital of WisconsinMilwaukeeWisconsinUSA
| | - Veronica H. Flood
- Versiti Blood Research InstituteMilwaukeeWisconsinUSA
- Division of Hematology/Oncology, Department of PediatricsMedical College of WisconsinMilwaukeeWisconsinUSA
- Children's Research Institute, Children's Hospital of WisconsinMilwaukeeWisconsinUSA
| | | | | | - Robert R. Montgomery
- Versiti Blood Research InstituteMilwaukeeWisconsinUSA
- Division of Hematology/Oncology, Department of PediatricsMedical College of WisconsinMilwaukeeWisconsinUSA
- Children's Research Institute, Children's Hospital of WisconsinMilwaukeeWisconsinUSA
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124
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Lavin M, Christopherson P, Grabell J, Abshire T, Flood V, Haberichter SL, Lillicrap D, O’Donnell JS, Montgomery RR, James PD. Longitudinal bleeding assessment in von Willebrand disease utilizing an interim bleeding score. J Thromb Haemost 2022; 20:2246-2254. [PMID: 35780487 PMCID: PMC10193460 DOI: 10.1111/jth.15807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 05/24/2022] [Accepted: 06/10/2022] [Indexed: 01/01/2023]
Abstract
BACKGROUND Assessment of bleeding phenotype is critically important in the diagnosis of von Willebrand disease (VWD). Despite advances in bleeding assessment tools (BATs), standardized tools to evaluate bleeding following diagnosis (interim bleeding) are lacking. OBJECTIVES We assessed the clinical utility of an interim bleeding protocol in a multicenter, international study involving patients with VWD. METHODS The enrolment ISTH BAT formed the original bleeding score (0 BS). At follow-up, the International Society on Thrombosis and Haemostasis BAT was repeated but included only interval bleeding (Interim BS, 1 BS). Both scores were annualized (0 BS/yr, 1 BS/yr). BS were analyzed by VWD subtype, plasma VWF level, sex, and age. RESULTS Interim BS discriminated by subtype, with significantly increased 0 BS and 1 BS in patients with type 3 VWD. In patients with type 1 VWD, a positive or negative 0 BS did not predict future bleeding, with similar 1 BS/yr (median 1.0 vs. 0.7, p = .2). Despite significantly higher 0 BS in females with type 1 VWD than males (median 7 vs. 5, p = .0012), 1 BS were not significantly different (median 4 vs. 4, p = .16). While 0 BS were lower in children than adults with type 1 VWD, interim BS were similar (median 5 vs. 3, p = .5; 1BS/yr, median 1 vs. 0.8, p = .7). Interestingly, in those with plasma von Willebrand factor:ristocetin cofactor levels >50 IU/dl, interim BS rates were similar to those 30-50 IU/dl (1 BS/yr 0.8 vs. 1.3, p = .5). CONCLUSION This study provides both a new approach to longitudinal bleeding assessment and insights into the evolution of bleeding in VWD.
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Affiliation(s)
- Michelle Lavin
- National Coagulation Centre, St. James’s Hospital, Dublin, Ireland
- Irish Centre for Vascular Biology, Royal College of Surgeons in Ireland, Dublin, Ireland
| | | | - Julie Grabell
- Department of Medicine, Queen’s University, Kingston, Ontario, Canada
| | - Thomas Abshire
- Blood Research Institute, Versiti, Milwaukee, Wisconsin, USA
| | - Veronica Flood
- Blood Research Institute, Versiti, Milwaukee, Wisconsin, USA
| | | | - David Lillicrap
- Department of Pathology & Molecular Medicine, Queen’s University, Kingston, Ontario, Canada
| | - James S. O’Donnell
- National Coagulation Centre, St. James’s Hospital, Dublin, Ireland
- Irish Centre for Vascular Biology, Royal College of Surgeons in Ireland, Dublin, Ireland
| | | | - Paula D. James
- Department of Medicine, Queen’s University, Kingston, Ontario, Canada
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125
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Carpenter SL, Abshire TC, Killough E, Anderst JD. Evaluating for Suspected Child Abuse: Conditions That Predispose to Bleeding. Pediatrics 2022; 150:189508. [PMID: 36120799 DOI: 10.1542/peds.2022-059277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Child abuse might be suspected when children present with cutaneous bruising, intracranial hemorrhage, or other manifestations of bleeding. In these cases, it is necessary to consider medical conditions that predispose to easy bleeding or bruising. When evaluating for the possibility of bleeding disorders and other conditions that predispose to hemorrhage, it is important for pediatricians to consider the child's presenting history, medical history, and physical examination findings before initiating a laboratory investigation. Many medical conditions can predispose to easy bleeding. Before ordering laboratory tests for a disease, it is useful to understand the biochemical basis and clinical presentation of the disorder, condition prevalence, and test characteristics. This technical report reviews the major medical conditions that predispose to bruising or bleeding and should be considered when evaluating for abusive injury.
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Affiliation(s)
- Shannon L Carpenter
- Division of Hematology/Oncology/BMT, Children's Mercy Hospital, Department of Pediatrics, University of Missouri Kansas City School of Medicine, Kansas City, Missouri
| | - Thomas C Abshire
- Senior Investigator Emeritus, Versiti Blood Research Institute, Department of Pediatrics, Medicine, and the CTSI of Southeast Wisconsin, Emeritus, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Emily Killough
- Division of Child Adversity and Resilience, Children's Mercy Hospital, Department of Pediatrics, University of Missouri Kansas City School of Medicine, Kansas City, Missouri
| | - James D Anderst
- Division of Child Adversity and Resilience, Children's Mercy Hospital, Department of Pediatrics, University of Missouri Kansas City School of Medicine, Kansas City, Missouri
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126
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Iizuka K, Morishita S, Nishizaki Y, Iizuka Y, Iriyama N, Ochiai T, Yanagisawa N, Yasuda H, Ando J, Gotoh A, Takei M, Hatta Y, Nakamura H, Nakayama T, Komatsu N. Von Willebrand factor activity levels are influenced by driver mutation status in polycythemia vera and essential thrombocythemia patients with well-controlled platelet counts. Eur J Haematol Suppl 2022; 109:779-786. [PMID: 36130908 DOI: 10.1111/ejh.13866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 09/05/2022] [Accepted: 09/08/2022] [Indexed: 01/19/2023]
Abstract
Von Willebrand factor ristocetin cofactor (VWF activity) and platelet count (PLT) are negatively correlated in patients with polycythemia vera (PV) and essential thrombocythemia (ET). However, VWF activity does not always normalize upon controlling PLT in those patients. To address this issue, we investigated the correlation between VWF activity and PLT in PV and ET patients. The negative correlation between VWF activity and PLT was stronger in calreticulin mutation-positive (CALR+) ET than in Janus kinase 2 mutation-positive (JAK2+) PV or ET groups. When PLT were maintained at a certain level (<600 × 109 /L), low VWF activity (<50%) was more frequently observed in JAK2+ PV patients than in JAK2+ ET (p=0.013) or CALR+ ET (p=0.013) groups, and in PV and ET patients with ≥50% JAK2+ allele burden than in those with allele burden <50% (p=0.015). High VWF activity (>150%) was more frequent in the JAK2+ ET group than in the CALR+ ET group (p=0.005), and often associated with vasomotor symptoms (p=0.002). This study suggests that some patients with JAK2+ PV or ET have VWF activity outside the standard range even with well-controlled PLT, and that the measurement of VWF activity is useful for assessing the risk of thrombosis and hemorrhage.
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Affiliation(s)
- Kazuhide Iizuka
- Division of Laboratory Medicine, Department of Pathology and Microbiology, Nihon University School of Medicine, Tokyo, Japan.,Department of Hematology, Juntendo University School of Medicine, Tokyo, Japan.,Division of Hematology and Rheumatology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan.,Internal Medicine, Atami Tokoro Memorial Hospital, Shizuoka, Japan
| | - Soji Morishita
- Laboratory for the development of therapies against MPN, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Department of Advanced Hematology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Yuji Nishizaki
- Medical Technology Innovation Center, Juntendo University, Tokyo, Japan
| | - Yoshikazu Iizuka
- Division of Hematology and Rheumatology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Noriyoshi Iriyama
- Division of Hematology and Rheumatology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Tomonori Ochiai
- Department of Hematology, Juntendo University School of Medicine, Tokyo, Japan
| | | | - Hajime Yasuda
- Department of Hematology, Juntendo University School of Medicine, Tokyo, Japan
| | - Jun Ando
- Department of Hematology, Juntendo University School of Medicine, Tokyo, Japan.,Department of Cell Therapy and Transfusion Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Akihiko Gotoh
- Department of Hematology, Tokyo Medical University, Tokyo, Japan
| | - Masami Takei
- Division of Hematology and Rheumatology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Yoshihiro Hatta
- Division of Hematology and Rheumatology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Hideki Nakamura
- Division of Hematology and Rheumatology, Department of Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Tomohiro Nakayama
- Division of Laboratory Medicine, Department of Pathology and Microbiology, Nihon University School of Medicine, Tokyo, Japan
| | - Norio Komatsu
- Department of Hematology, Juntendo University School of Medicine, Tokyo, Japan.,Laboratory for the development of therapies against MPN, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Department of Advanced Hematology, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Pharmaessentia Japan KK, Tokyo, Japan
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127
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Ziemba YC, Abdulrehman J, Hollestelle MJ, Meijer P, Plumhoff E, Hsu P, Selby R. Diagnostic Testing for von Willebrand Disease: Trends and Insights from North American Laboratories over the Last Decade. Semin Thromb Hemost 2022; 48:700-710. [PMID: 36122573 DOI: 10.1055/s-0042-1754332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
Accurate diagnosis of von Willebrand disease (VWD) depends on the quality, precision, and variability of the laboratory assays. The North American Specialized Coagulation Laboratory Association (NASCOLA) is a provider of external quality assessment (EQA) for approximately 60 specialized coagulation laboratories in North America. In this report, NASCOLA EQA data from 2010 to 2021 are reviewed for trends in methodology and precision among various assays. In particular, recent ASH ISTH NHF WFH (American Society of Hematology, International Society on Thrombosis and Haemostasis, National Hemophilia Foundation, and World Hemophilia Federation) guidelines for diagnosis of VWD are reviewed in light of EQA data. In contrast to other geographic regions, laboratories in North America predominantly use three-assay screening panels (antigen, platelet-binding activity, and factor VIII [FVIII] activity) rather than four-assay panels (antigen, platelet-binding activity, FVIII activity, and collagen-binding activity). They also use latex immunoassays rather than chemiluminescence immunoassays, and the classic ristocetin cofactor (VWF:RCo) assay and monoclonal antibody (VWF:Ab) assay to assess VWF platelet-binding activity over newer recommended assays (VWF:GPIbM and VWF:GPIbR). Factors that may be influencing these North American practice patterns include lack of Food and Drug Administration approval of the VWF:GPIbM, VWF:GPIbR, collagen binding assays, and chemiluminescence methodologies, and the influence of the 2008 National Heart, Lung, and Blood Institute guidelines on laboratory practice. Lastly, systems-based solutions are urgently needed to improve the overall accuracy of laboratory testing for VWD by minimizing preanalytical variables and adopting assay standardization.
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Affiliation(s)
- Yonah C Ziemba
- Department of Pathology and Laboratory Medicine, Northwell Health, New York, New York
| | | | | | - Piet Meijer
- ECAT Foundation, Voorschoten, the Netherlands
| | - Elizabeth Plumhoff
- North American Specialized Coagulation Laboratory Association, Rochester, Minnesota
| | - Peihong Hsu
- Department of Pathology and Laboratory Medicine, Northwell Health, New York, New York
| | - Rita Selby
- Department of Medicine, University of Toronto, Toronto, Ontario, Canada.,North American Specialized Coagulation Laboratory Association, Rochester, Minnesota.,Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
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128
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Salazar E, Long TA, Smock KJ, Wool GD, Rollins-Raval M, Chen D, Harris NS, Chan CW, Olson JD, Pham HP, Ritter J, Unold D, VanSandt AM, Goodwin Iv AJ. Analysis of College of American Pathologists von Willebrand Factor Proficiency Testing Program. Semin Thromb Hemost 2022. [PMID: 36063852 DOI: 10.1055/s-0042-1757132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
Von Willebrand factor (VWF) level and/or function is altered in von Willebrand disease (VWD), the most common heritable bleeding disorder worldwide. Laboratory assessment of VWF is continually evolving. Historically, the primary method for the assessment of VWF platelet-binding activity was the ristocetin cofactor assay (VWF:RCo). Contemporary alternative measures of VWF platelet-binding activity include VWF:GPIbR (recombinant; using ristocetin), VWF:GPIbM (recombinant; gain-of-function mutant), and monoclonal antibody. Recently, the American Society of Hematology, International Society on Thrombosis and Haemostasis, National Hemophilia Foundation, and World Federation of Hemophilia collaboration issued guidelines recommending the use of newer assays of VWF platelet-binding activity (VWF: GPIbM, VWF: GPIbR) over VWF:RCo, given known limitations of the VWF:RCo assay. Despite this recommendation, the newer VWF:GPIbM and VWF:GPIbR assays are not United States Food and Drug Administration cleared, limiting their availability in the United States. We sought to assess assay utilization trends, agreement of VWF testing methods, and imprecision of VWF testing (based on assigned sample type) from the College of American Pathologists Proficiency Testing Surveys. The analysis confirms that, while VWF antigen testing has low imprecision, the various VWF activity assays have significant interassay variability, with VWF:RCo showing greater imprecision than the newer GPIb-binding assays. The overall trends in assay utilization reflect the barriers to complete compliance with modern VWD diagnostic guidelines in North America.
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Affiliation(s)
- Eric Salazar
- Department of Pathology and Laboratory Medicine, UT Health San Antonio, San Antonio, Texas
| | - Thomas A Long
- Department of Biostatistics, College of American Pathologists, Northfield, Illinois
| | - Kristi Johnson Smock
- Department of Pathology and ARUP Laboratories, University of Utah, Salt Lake City, Utah
| | - Geoffrey D Wool
- Department of Pathology, University of Chicago, Chicago, Illinois
| | | | - Dong Chen
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | | | - Clarence W Chan
- Department of Pathology, University of Chicago Medical Center, Chicago, Illinois
| | - John D Olson
- Department of Pathology and Laboratory Medicine, UT Health San Antonio, San Antonio, Texas
| | - Huy P Pham
- Seattle Apheresis Collection Center, National Marrow Donor Program (NMDP)Seattle, Washington
| | - Jacob Ritter
- Department of Pathology and Laboratory Medicine, UT Health San Antonio, San Antonio, Texas
| | - David Unold
- Department of Pathology and Laboratory Medicine, University of California Davis Medical Center, Sacramento, California
| | - Amanda Matzke VanSandt
- Department of Pathology and Laboratory Medicine, Oregon Health & Science University, Portland, Oregon
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129
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Hollestelle MJ, Meijers JCM, Meijer P. How Do Laboratories Perform von Willebrand Disease Diagnostics and Classification of von Willebrand Disease Patients? Results from External Quality Data and an International Survey. Semin Thromb Hemost 2022. [PMID: 36063849 DOI: 10.1055/s-0042-1757137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
BACKGROUND Reduced or dysfunctional von Willebrand factor (VWF) may lead to von Willebrand disease (VWD), which is a common inherited bleeding disorder. VWD is classified into three major types: type 1 is a partial quantitative deficiency of VWF, type 3 is a complete quantitative deficiency of VWF, and type 2 consists of qualitative abnormalities of VWF. To arrive at a correct VWD diagnosis, multiple tests and a correct interpretation of these tests are needed. AIM The aim of the present study was to gain insight into the approach of laboratories toward VWD diagnosis. METHODS Data from four samples of the external quality assessment (EQA) VWF surveys of the ECAT (External Quality Control for Assays and Tests) were evaluated. Furthermore, results were analyzed of a questionnaire that was sent to hemostasis laboratories about VWD diagnostic approaches. RESULTS For most EQA samples, the majority of participants indicated the correct classification. However, 6 to 60% indicated another classification. For all samples, significant differences in VWF results were observed between the correct and incorrect classifications. The questionnaire demonstrated that the testing approach varied between the laboratories, especially for parameters that were essential for discrimination between VWD type 1 and healthy individuals, as well as the cutoff values used to discriminate VWD types 1 and 2. CONCLUSIONS Diagnosis of VWD is heterogeneous in diagnostic approach, guidelines, and cutoff values within large ranges of VWF results between laboratories. Harmonization of approaches and increased accuracy of VWF measurements may help to establish a correct diagnosis.
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Affiliation(s)
- Martine J Hollestelle
- External Quality Control for Assays and Tests (ECAT) Foundation, Voorschoten, the Netherlands
| | - Joost C M Meijers
- Department of Experimental Vascular Medicine, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, the Netherlands.,Department of Molecular Hematology, Sanquin Research, Amsterdam, the Netherlands
| | - Piet Meijer
- External Quality Control for Assays and Tests (ECAT) Foundation, Voorschoten, the Netherlands
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130
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Jennings I, Reilly-Stitt C, Lowe A, Kitchen S, Walker I. External Quality Assessment Data for Investigation of von Willebrand Disease: Focus on Relative Utility of Contemporary Functional von Willebrand Factor Assays. The United Kingdom National External Quality Assessment Scheme (UK NEQAS) Experience. Semin Thromb Hemost 2022; 48:732-738. [PMID: 36055268 DOI: 10.1055/s-0042-1753512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
Von Willebrand disease (VWD) is one of the most common hereditary bleeding disorders. Effective management of patients and their families depends on accurate diagnosis and subtype classification, and quality assurance including participation in proficiency testing programs is essential to ensure the accuracy of the panel of assays required to achieve this diagnosis. We report here findings from recent external quality assessment (EQA) exercises, as well as from a questionnaire about diagnostic practices employed by centers in the United Kingdom National Quality Assessment Scheme (UK NEQAS) performing von Willebrand factor (VWF) assays. Plasma samples from donors with VWD, "normal" donors, the International Society for Thrombosis and Haemostasis Scientific Subcommittee (ISTH SSC) plasma standard, and whole blood samples were sent to participants in the UK NEQAS BC program for VWF investigation. Calibration of lot#5 of the ISTH SSC plasma standard was shown to give improved comparability between the recovered value from an EQA exercise and the assigned potency for VWF activity assays. Diagnostic accuracy and precision amongst UK NEQAS participants was good, with an average 99% of centers reporting the correct interpretation for normal, type 1 and type 2 VWD samples, 100% diagnostic accuracy for centers performing FVIII binding assays, and good agreement amongst centers performing multimeric analysis. Genetic analysis of the VWF gene by specialist centers demonstrated errors in the genotyping process in one center, but also demonstrated failings in the interpretation of results in other centers. Despite evidence of good laboratory accuracy and precision in their assays, a questionnaire identified marked variation in diagnostic criteria employed, underlining the importance of guidelines to support the diagnosis of VWD.
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Affiliation(s)
- Ian Jennings
- Department of Blood Coagulation, UK NEQAS, Sheffield, United Kingdom
| | | | - Anna Lowe
- Department of Blood Coagulation, UK NEQAS, Sheffield, United Kingdom
| | - Steve Kitchen
- Department of Blood Coagulation, UK NEQAS, Sheffield, United Kingdom
| | - Isobel Walker
- Department of Blood Coagulation, UK NEQAS, Sheffield, United Kingdom
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131
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Favaloro EJ, Pasalic L. Laboratory Diagnosis of von Willebrand Disease (VWD): Geographical Perspectives. Semin Thromb Hemost 2022; 48:750-766. [PMID: 36055264 DOI: 10.1055/s-0042-1754331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
von Willebrand disease (VWD) is reportedly the most common inherited bleeding disorder, and can also arise as an acquired (von Willebrand) syndrome (AVWS). The hemostasis laboratory plays a key role in the diagnosis or exclusion of VWD/AVWS, which may otherwise be suspected due to the patient's clinical (bleeding) history. VWD/AVWS arise from deficiency and/or defects in the adhesive plasma protein, von Willebrand factor (VWF). VWF undertakes various roles within hemostasis, but principally acts within primary hemostasis to anchor platelets to sites of vascular damage, thereby facilitating thrombus formation to arrest bleeding. The diagnosis or exclusion of VWD/AVWS requires laboratory testing for both VWF level and activity, with the latter potentially comprising several of a potential plethora of different assays. Complete diagnosis of VWD also requires the differentiation of VWD type, with six types comprising the current classification (i.e., qualitative [types 2A, 2B, 2M, 2N VWD] vs. quantitative [types 1 and 3 VWD] deficiency/defects). Although appropriate diagnosis and type classification hold important therapeutic consequences, these remain problematic and sometimes elusive for some laboratories to achieve. This report reviews the laboratory aided diagnosis or exclusion of VWD from a geographic perspective, and focuses on the disparities of approaches and methods in different regions of the world. This is primarily done from the perspective of data available from published reports related to external quality assessment (or proficiency testing) from different geographic localities. Moreover, differences in approaches between laboratories may arise due to differential adherence of particular guidelines, as well as regulatory aspects and predominance of local manufacturers and suppliers.
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Affiliation(s)
- Emmanuel J Favaloro
- Department of Haematology, Institute of Clinical Pathology and Medical Research (ICPMR), NSW Health Pathology, Westmead Hospital, Westmead, North South Wales, Australia.,Sydney Centres for Thrombosis and Haemostasis, Westmead, North South Wales, Australia.,Faculty of Science and Health, Charles Sturt University, Wagga Wagga, North South Wales, Australia
| | - Leonardo Pasalic
- Department of Haematology, Institute of Clinical Pathology and Medical Research (ICPMR), NSW Health Pathology, Westmead Hospital, Westmead, North South Wales, Australia.,Sydney Centres for Thrombosis and Haemostasis, Westmead, North South Wales, Australia.,Westmead Clinical School, University of Sydney, Westmead, North South Wales, Australia
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132
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Smock KJ, Gosselin RC. Preface: Laboratory Diagnostics for Thrombosis and Hemostasis Testing - Part I. Semin Thromb Hemost 2022; 48:631-633. [PMID: 36055260 DOI: 10.1055/s-0042-1755367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Kristi J Smock
- Department of Pathology and ARUP Laboratories, University of Utah, Salt Lake City, Utah
| | - Robert C Gosselin
- Hemostasis and Thrombosis Center, University of California, Davis Health System, Sacramento, California
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133
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Hollestelle MJ, Meijers JCM, Meijer P. How Do Laboratories Perform von Willebrand Disease Diagnostics and Classification of von Willebrand Disease Patients? Results from External Quality Data and an International Survey. Semin Thromb Hemost 2022; 48:739-749. [DOI: 10.1055/s-0042-1758163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Abstract
Background Reduced or dysfunctional von Willebrand factor (VWF) may lead to von Willebrand disease (VWD), which is a common inherited bleeding disorder. VWD is classified into three major types: type 1 is a partial quantitative deficiency of VWF, type 3 is a complete quantitative deficiency of VWF, and type 2 consists of qualitative abnormalities of VWF. To arrive at a correct VWD diagnosis, multiple tests and a correct interpretation of these tests are needed.
Aim The aim of the present study was to gain insight into the approach of laboratories toward VWD diagnosis.
Methods Data from four samples of the external quality assessment (EQA) VWF surveys of the ECAT (External Quality Control for Assays and Tests) were evaluated. Furthermore, results were analyzed of a questionnaire that was sent to hemostasis laboratories about VWD diagnostic approaches.
Results For most EQA samples, the majority of participants indicated the correct classification. However, 6 to 60% indicated another classification. For all samples, significant differences in VWF results were observed between the correct and incorrect classifications. The questionnaire demonstrated that the testing approach varied between the laboratories, especially for parameters that were essential for discrimination between VWD type 1 and healthy individuals, as well as the cutoff values used to discriminate VWD types 1 and 2.
Conclusions Diagnosis of VWD is heterogeneous in diagnostic approach, guidelines, and cutoff values within large ranges of VWF results between laboratories. Harmonization of approaches and increased accuracy of VWF measurements may help to establish a correct diagnosis.
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Affiliation(s)
- Martine J. Hollestelle
- External Quality Control for Assays and Tests (ECAT) Foundation, Voorschoten, the Netherlands
| | - Joost C. M. Meijers
- Department of Experimental Vascular Medicine, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, the Netherlands
- Department of Molecular Hematology, Sanquin Research, Amsterdam, the Netherlands
| | - Piet Meijer
- External Quality Control for Assays and Tests (ECAT) Foundation, Voorschoten, the Netherlands
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134
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Hollestelle MJ, Meijers JCM, Meijer P. How Do Laboratories Perform von Willebrand Disease Diagnostics and Classification of von Willebrand Disease Patients? Results from External Quality Data and an International Survey. Semin Thromb Hemost 2022; 48:739-749. [PMID: 36055267 DOI: 10.1055/s-0042-1754354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
BACKGROUND Reduced or dysfunctional von Willebrand factor (VWF) may lead to von Willebrand disease (VWD), which is a common inherited bleeding disorder. VWD is classified into three major types: type 1 is a partial quantitative deficiency of VWF, type 3 is a complete quantitative deficiency of VWF, and type 2 consists of qualitative abnormalities of VWF. To arrive at a correct VWD diagnosis, multiple tests and a correct interpretation of these tests are needed. AIM The aim of the present study was to gain insight into the approach of laboratories toward VWD diagnosis. METHODS Data from four samples of the external quality assessment (EQA) VWF surveys of the ECAT (External Quality Control for Assays and Tests) were evaluated. Furthermore, results were analyzed of a questionnaire that was sent to hemostasis laboratories about VWD diagnostic approaches. RESULTS For most EQA samples, the majority of participants indicated the correct classification. However, 6 to 60% indicated another classification. For all samples, significant differences in VWF results were observed between the correct and incorrect classifications. The questionnaire demonstrated that the testing approach varied between the laboratories, especially for parameters that were essential for discrimination between VWD type 1 and healthy individuals, as well as the cutoff values used to discriminate VWD types 1 and 2. CONCLUSIONS Diagnosis of VWD is heterogeneous in diagnostic approach, guidelines, and cutoff values within large ranges of VWF results between laboratories. Harmonization of approaches and increased accuracy of VWF measurements may help to establish a correct diagnosis.
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Affiliation(s)
- Martine J Hollestelle
- External Quality Control for Assays and Tests (ECAT) Foundation, Voorschoten, the Netherlands
| | - Joost C M Meijers
- Department of Experimental Vascular Medicine, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, the Netherlands
- Department of Molecular Hematology, Sanquin Research, Amsterdam, the Netherlands
| | - Piet Meijer
- External Quality Control for Assays and Tests (ECAT) Foundation, Voorschoten, the Netherlands
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135
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Salazar E, Long TA, Smock KJ, Wool GD, Rollins-Raval M, Chen D, Harris NS, Chan CW, Olson JD, Pham HP, Ritter J, Unold D, VanSandt AM, Goodwin Iv AJ. Analysis of College of American Pathologists von Willebrand Factor Proficiency Testing Program. Semin Thromb Hemost 2022; 48:690-699. [PMID: 36055272 DOI: 10.1055/s-0042-1749591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
Von Willebrand factor (VWF) level and/or function is altered in von Willebrand disease (VWD), the most common heritable bleeding disorder worldwide. Laboratory assessment of VWF is continually evolving. Historically, the primary method for the assessment of VWF platelet-binding activity was the ristocetin cofactor assay (VWF:RCo). Contemporary alternative measures of VWF platelet-binding activity include VWF:GPIbR (recombinant; using ristocetin), VWF:GPIbM (recombinant; gain-of-function mutant), and monoclonal antibody. Recently, the American Society of Hematology, International Society on Thrombosis and Haemostasis, National Hemophilia Foundation, and World Federation of Hemophilia collaboration issued guidelines recommending the use of newer assays of VWF platelet-binding activity (VWF: GPIbM, VWF: GPIbR) over VWF:RCo, given known limitations of the VWF:RCo assay. Despite this recommendation, the newer VWF:GPIbM and VWF:GPIbR assays are not United States Food and Drug Administration cleared, limiting their availability in the United States. We sought to assess assay utilization trends, agreement of VWF testing methods, and imprecision of VWF testing (based on assigned sample type) from the College of American Pathologists Proficiency Testing Surveys. The analysis confirms that, while VWF antigen testing has low imprecision, the various VWF activity assays have significant interassay variability, with VWF:RCo showing greater imprecision than the newer GPIb-binding assays. The overall trends in assay utilization reflect the barriers to complete compliance with modern VWD diagnostic guidelines in North America.
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Affiliation(s)
- Eric Salazar
- Department of Pathology and Laboratory Medicine, UT Health San Antonio, San Antonio, Texas
| | - Thomas A Long
- Department of Biostatistics, College of American Pathologists, Northfield, Illinois
| | - Kristi Johnson Smock
- Department of Pathology and ARUP Laboratories, University of Utah, Salt Lake City, Utah
| | - Geoffrey D Wool
- Department of Pathology, University of Chicago, Chicago, Illinois
| | | | - Dong Chen
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | | | - Clarence W Chan
- Department of Pathology, University of Chicago Medical Center, Chicago, Illinois
| | - John D Olson
- Department of Pathology and Laboratory Medicine, UT Health San Antonio, San Antonio, Texas
| | - Huy P Pham
- Seattle Apheresis Collection Center, National Marrow Donor Program (NMDP)Seattle, Washington
| | - Jacob Ritter
- Department of Pathology and Laboratory Medicine, UT Health San Antonio, San Antonio, Texas
| | - David Unold
- Department of Pathology and Laboratory Medicine, University of California Davis Medical Center, Sacramento, California
| | - Amanda Matzke VanSandt
- Department of Pathology and Laboratory Medicine, Oregon Health & Science University, Portland, Oregon
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136
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Salazar E, Long TA, Smock KJ, Wool GD, Rollins-Raval M, Chen D, Harris NS, Chan CW, Olson JD, Pham HP, Ritter J, Unold D, VanSandt AM, Goodwin IV AJ. Analysis of College of American Pathologists von Willebrand Factor Proficiency Testing Program. Semin Thromb Hemost 2022; 48:690-699. [DOI: 10.1055/s-0042-1758161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
AbstractVon Willebrand factor (VWF) level and/or function is altered in von Willebrand disease (VWD), the most common heritable bleeding disorder worldwide. Laboratory assessment of VWF is continually evolving. Historically, the primary method for the assessment of VWF platelet-binding activity was the ristocetin cofactor assay (VWF:RCo). Contemporary alternative measures of VWF platelet-binding activity include VWF:GPIbR (recombinant; using ristocetin), VWF:GPIbM (recombinant; gain-of-function mutant), and monoclonal antibody. Recently, the American Society of Hematology, International Society on Thrombosis and Haemostasis, National Hemophilia Foundation, and World Federation of Hemophilia collaboration issued guidelines recommending the use of newer assays of VWF platelet-binding activity (VWF: GPIbM, VWF: GPIbR) over VWF:RCo, given known limitations of the VWF:RCo assay. Despite this recommendation, the newer VWF:GPIbM and VWF:GPIbR assays are not United States Food and Drug Administration cleared, limiting their availability in the United States. We sought to assess assay utilization trends, agreement of VWF testing methods, and imprecision of VWF testing (based on assigned sample type) from the College of American Pathologists Proficiency Testing Surveys. The analysis confirms that, while VWF antigen testing has low imprecision, the various VWF activity assays have significant interassay variability, with VWF:RCo showing greater imprecision than the newer GPIb-binding assays. The overall trends in assay utilization reflect the barriers to complete compliance with modern VWD diagnostic guidelines in North America.
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Affiliation(s)
- Eric Salazar
- Department of Pathology and Laboratory Medicine, UT Health San Antonio, San Antonio, Texas
| | - Thomas A. Long
- Department of Biostatistics, College of American Pathologists, Northfield, Illinois
| | - Kristi Johnson Smock
- Department of Pathology and ARUP Laboratories, University of Utah, Salt Lake City, Utah
| | - Geoffrey D. Wool
- Department of Pathology, University of Chicago, Chicago, Illinois
| | | | - Dong Chen
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | | | - Clarence W. Chan
- Department of Pathology, University of Chicago Medical Center, Chicago, Illinois
| | - John D. Olson
- Department of Pathology and Laboratory Medicine, UT Health San Antonio, San Antonio, Texas
| | - Huy P. Pham
- Seattle Apheresis Collection Center, National Marrow Donor Program (NMDP)Seattle, Washington
| | - Jacob Ritter
- Department of Pathology and Laboratory Medicine, UT Health San Antonio, San Antonio, Texas
| | - David Unold
- Department of Pathology and Laboratory Medicine, University of California Davis Medical Center, Sacramento, California
| | - Amanda Matzke VanSandt
- Department of Pathology and Laboratory Medicine, Oregon Health & Science University, Portland, Oregon
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Curry N, Bowles L, Clark TJ, Lowe G, Mainwaring J, Mangles S, Myers B, Kadir RA. Gynaecological management of women with inherited bleeding disorders. Haemophilia 2022; 28:917-937. [PMID: 35976756 DOI: 10.1111/hae.14643] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 06/20/2022] [Accepted: 07/17/2022] [Indexed: 12/17/2022]
Abstract
Women with inherited bleeding disorders (IBDs) may present to healthcare professionals in a variety of ways and commonly will be encountered by either haematology or gynaecology services. Heavy menstrual bleeding is very often the first manifestation of an IBD. There is a wide variation in severity of bleeding for women with IBD and diagnosis and subsequent management of their condition requires multidisciplinary specialised care which is tailored to the individual and includes excellent cross-specialty communication between gynaecology and haematology teams. This guideline is intended for both haematologists and gynaecologists who are involved in the diagnosis and management of women with bleeding disorders. It sets out recommendations about how to investigate heavy menstrual bleeding (HMB), the commonest presentation for women with IBD to hospital services, to guide physicians about how to diagnose an IBD and covers the management of women with known IBD and HMB. The second section sets out recommendations for patients known to have IBD and covers management of patients with IBD in the setting of gynaecological surgery and management for all other non-surgical gynaecological situations.
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Affiliation(s)
- Nicola Curry
- Oxford Haemophilia and Thrombosis Centre, Oxford University Hospitals NHS Foundation Trust, and NIHR BRC Blood Theme, Oxford University, Oxford, UK
| | - Louise Bowles
- The Royal London Hospital Haemophilia Comprehensive Care Centre, The Royal London Hospital, Whitechapel, London, UK
| | - T Justin Clark
- Birmingham Women's NHS Foundation Trust, University of Birmingham, Birmingham, UK
| | - Gillian Lowe
- West Midlands Comprehensive Care Haemophilia Unit, University Hospitals Birmingham, Mindelsohn Way, Edgbaston, Birmingham, UK
| | - Jason Mainwaring
- Bournemouth and Poole Haemophilia Centre, Royal Bournemouth Hospital, Castle Lane East, Bournemouth, Dorset, UK
| | - Sarah Mangles
- Haemophilia, Haemostasis and Thrombosis Centre, Hampshire Hospitals NHS Foundation Trust, Basingstoke, UK
| | - Bethan Myers
- Leicester Haemostasis and Thrombosis Centre, University Hospitals of Leicester, Leicester, UK
| | - Rezan Abdul Kadir
- Department of Obstetrics and Gynaecology, Katharine Dormandy Haemophilia and Thrombosis Unit, The Royal Free NHS Foundation Hospital and Institute for Women's Health, University College London, London, UK
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Okamoto S, Tamura S, Sanda N, Odaira K, Hayakawa Y, Mukaide M, Suzuki A, Kanematsu T, Hayakawa F, Katsumi A, Kiyoi H, Kojima T, Matsushita T, Suzuki N. VWF-Gly2752Ser, a novel non-cysteine substitution variant in the CK domain, exhibits severe secretory impairment by hampering C-terminal dimer formation. J Thromb Haemost 2022; 20:1784-1796. [PMID: 35491445 DOI: 10.1111/jth.15746] [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: 07/18/2021] [Revised: 04/11/2022] [Accepted: 04/22/2022] [Indexed: 08/31/2023]
Abstract
BACKGROUND Von Willebrand factor (VWF) is a multimeric glycoprotein that plays important roles in hemostasis and thrombosis. C-terminal interchain-disulfide bonds in the cystine knot (CK) domain are essential for VWF dimerization. Previous studies have reported that missense variants of cysteine in the CK domain disrupt the intrachain-disulfide bond and cause type 3 von Willebrand disease (VWD). However, type 3 VWD-associated noncysteine substitution variants in the CK domain have not been reported. OBJECTIVE To investigate the molecular mechanism of a novel non-cysteine variant in the CK domain, VWF c.8254 G>A (p.Gly2752Ser), which was identified in a patient with type 3 VWD as homozygous. METHODS Genetic analysis was performed by whole exome sequencing and Sanger sequencing. VWF multimer analysis was performed using SDS-agarose electrophoresis. VWF production and subcellular localization were analyzed using ex vivo endothelial colony forming cells (ECFCs) and an in vitro recombinant VWF (rVWF) expression system. RESULTS The patient was homozygous for VWF-Gly2752Ser. Plasma VWF enzyme-linked immunosorbent assay showed that the VWF antigen level of the patient was 1.2% compared with healthy subjects. A tiny amount of VWF was identified in the patient's ECFC. Multimer analysis revealed that the circulating VWF-Gly2752Ser presented only low molecular weight multimers. Subcellular localization analysis of VWF-Gly2752Ser-transfected cell lines showed that rVWF-Gly2752Ser was severely impaired in its ER-to-Golgi trafficking. CONCLUSION VWF-Gly2752Ser causes severe secretory impairment because of its dimerization failure. This is the first report of a VWF variant with a noncysteine substitution in the CK domain that causes type 3 VWD.
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Affiliation(s)
- Shuichi Okamoto
- Department of Hematology and Oncology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Shogo Tamura
- Division of Cellular and Genetic Sciences, Department of Integrated Health Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Naomi Sanda
- Department of Medical Technique, Nagoya University Hospital, Nagoya, Japan
| | - Koya Odaira
- Division of Cellular and Genetic Sciences, Department of Integrated Health Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yuri Hayakawa
- Division of Cellular and Genetic Sciences, Department of Integrated Health Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Masato Mukaide
- Division of Cellular and Genetic Sciences, Department of Integrated Health Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Atsuo Suzuki
- Department of Medical Technique, Nagoya University Hospital, Nagoya, Japan
| | - Takeshi Kanematsu
- Department of Laboratory Medicine, Nagoya University Hospital, Nagoya, Japan
| | - Fumihiko Hayakawa
- Division of Cellular and Genetic Sciences, Department of Integrated Health Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Akira Katsumi
- Department of Hematology, National Center for Geriatrics and Gerontology, Obu City, Japan
| | - Hitoshi Kiyoi
- Department of Hematology and Oncology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Tetsuhito Kojima
- Division of Cellular and Genetic Sciences, Department of Integrated Health Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan
- Aichi Health Promotion Foundation, Nagoya, Japan
| | - Tadashi Matsushita
- Department of Laboratory Medicine, Nagoya University Hospital, Nagoya, Japan
- Department of Transfusion Medicine, Nagoya University Hospital, Nagoya, Japan
| | - Nobuaki Suzuki
- Department of Transfusion Medicine, Nagoya University Hospital, Nagoya, Japan
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Khadadah F, Rupani N, Scott J, Trinkaus M, Teitel J, Sholzberg M. Lymphoma‐associated acquired von Willebrand syndrome responsive to splenectomy: A case report. EJHAEM 2022; 3:996-999. [PMID: 36051021 PMCID: PMC9421994 DOI: 10.1002/jha2.486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 05/05/2022] [Accepted: 05/12/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Fatima Khadadah
- Division of Hematology Kuwait Cancer Control Centre Shuwaikh Kuwait
| | - Natasha Rupani
- Division of Hematology Department of Medicine University of Toronto Toronto Canada
| | - Jordan Scott
- Division of Hematology Department of Medicine University of Toronto Toronto Canada
| | - Martina Trinkaus
- Division of Hematology/Oncology, Departments of Medicine and Laboratory Medicine & Pathobiology St. Michael's Hospital, University of Toronto Toronto Canada
| | - Jerome Teitel
- Division of Hematology/Oncology, Departments of Medicine and Laboratory Medicine & Pathobiology St. Michael's Hospital, University of Toronto Toronto Canada
| | - Michelle Sholzberg
- Division of Hematology/Oncology, Departments of Medicine and Laboratory Medicine & Pathobiology St. Michael's Hospital, University of Toronto Toronto Canada
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Hjelm Lundgaard M, Carlé A, Birgitte Christiansen U, Sørensen A, Risom Kristensen S, Andersen SL. Prolonged APTT and autoimmune overt hypothyroidism identified postpartum: a case report. Eur Thyroid J 2022; 11:e220109. [PMID: 35900856 PMCID: PMC9346323 DOI: 10.1530/etj-22-0109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 06/27/2022] [Indexed: 11/08/2022] Open
Abstract
INTRODUCTION Thyroid disorders have been linked to abnormalities in the coagulation system, and a hypocoagulant state has been proposed in hypothyroidism. The assessment of thyroid function is, however, not routinely recommended as part of the assessment for coagulation disorders. CASE PRESENTATION We present a 32-year-old woman who had no history of thyroid disease and who recently gave birth preterm because of severe preeclampsia and intrauterine growth restriction. Due to severe placental dysfunction, she underwent a routine biochemical assessment of the coagulation system 6 months postpartum, and a prolonged activated partial thromboplastin time (APTT) (43 s) was identified along with a low level of coagulation factor VIII (0.44 IU/mL), and a low level of von Willebrand factor (vWF) antigen (0.35 IU/mL), vWF activity (0.38 IU/mL) as well as reduced generation of thrombin. The assessment of thyroid function in the patient identified autoimmune, overt hypothyroidism with a thyroid-stimulating hormone (TSH) concentration of 139 mIU/L, low levels of the peripheral thyroid hormones (total thyroxine: 43 nmol/L, total triiodothyronine: 0.9 nmol/L), and high levels of thyroid peroxidase antibodies (296 U/mL) as well as thyroglobulin antibodies (927 U/mL). CONCLUSION In this case, prolonged APTT provided a diagnostic clue for the assessment of thyroid function in a young woman with a recent history of severe placental dysfunction. The identification of autoimmune, overt hypothyroidism emphasizes that measurement of TSH may be of clinical importance in cases of unexplained prolonged APTT or other biochemical signs of abnormalities in the coagulation system. ESTABLISHED FACTS Hypothyroidism has been associated with alterations of the coagulation system suggesting a hypocoagulant state. At present, measurement of thyroid-stimulating hormone is not routinely recommended as part of the assessment for coagulation disorders. NOVEL INSIGHTS In this case, biochemical assessment of the coagulation system was routinely performed following a pregnancy complicated by severe placental dysfunction. Overt hypothyroidism of autoimmune origin was identified secondary to prolonged activated partial thromboplastin time (APTT) postpartum along with low levels of coagulation factor VIII, von Willebrand factor, and thrombin generation. Measurement of thyroid-stimulating hormone may be considered in cases of unexplained prolonged APTT.
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Affiliation(s)
- Maja Hjelm Lundgaard
- Department of Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark
| | - Allan Carlé
- Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
- Department of Endocrinology, Aalborg University Hospital, Aalborg, Denmark
| | | | - Anne Sørensen
- Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
- Department of Gynaecology and Obstetrics, Aalborg University Hospital, Aalborg, Denmark
| | - Søren Risom Kristensen
- Department of Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark
- Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Stine Linding Andersen
- Department of Clinical Biochemistry, Aalborg University Hospital, Aalborg, Denmark
- Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
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Heijdra JM, Atiq F, Al Arashi W, Kieboom Q, Wuijster E, Meijer K, Kruip MJHA, Leebeek FWG, Cnossen MH. Desmopressin testing in von Willebrand disease: Lowering the burden. Res Pract Thromb Haemost 2022; 6:e12784. [PMID: 36186107 PMCID: PMC9512764 DOI: 10.1002/rth2.12784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 07/16/2022] [Accepted: 07/23/2022] [Indexed: 12/03/2022] Open
Abstract
Background Individuals with von Willebrand disease (VWD) require desmopressin testing because of interindividual response differences. However, testing is burdensome, while not all patients may need extensive testing. Objectives To provide von Willebrand factor (VWF) cutoffs that predict desmopressin nonresponse and thereby identify individuals who do not need extensive testing in a retrospective cohort. We validated these cutoffs in a prospective cohort. Patients and Methods We included 376 patients (Type 1 VWD with VWF activity [VWF:Act] <0.30 IU/ml: n = 112; with VWF:Act 0.30–0.50 IU/ml: n = 206; Type 2 VWD: n = 58; ages, 5–76 years) from January 2000 to July 2020. We collected VWF:Act and factor VIII activity (FVIII:C) at baseline and several time points after desmopressin (T1–T6). We defined response as VWF:Act and FVIII:C 0.50 IU/ml or greater at T1 and T4. We compared VWF:Act and FVIII:C distribution (historically lowest level, baseline, and T1) between responders and nonresponders and determined cutoffs discriminating between these groups. Results were validated in a group of 30 individuals. Results All individuals with Type 1 VWD and Type 2 VWD, respectively, with baseline VWF:Act 0.34 IU/ml or greater or 0.28 IU/ml or greater were responders. In individuals with T1 VWF:Act ≥0.89 IU/ml (Type 1 VWD) or T1 VWF:Act 1.10 IU/ml or greater (Type 2 VWD), response remained at T4. Conclusion Desmopressin testing is not needed when lowest historical VWF:Act is 0.30 IU/ml or greater. In patients with Type 1 VWD who require testing, measurements after T1 are often not needed. In patients with Type 2 VWD who require testing, we advise performing T1 and T4 measurements.
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Affiliation(s)
- Jessica M Heijdra
- Department of Pediatric Hematology Erasmus MC - Sophia Children's Hospital, University Medical Center Rotterdam Rotterdam The Netherlands
| | - Ferdows Atiq
- Department of Hematology Erasmus MC, University Medical Center Rotterdam Rotterdam The Netherlands
| | - Wala Al Arashi
- Department of Pediatric Hematology Erasmus MC - Sophia Children's Hospital, University Medical Center Rotterdam Rotterdam The Netherlands
| | - Quincy Kieboom
- Department of Pediatric Hematology Erasmus MC - Sophia Children's Hospital, University Medical Center Rotterdam Rotterdam The Netherlands
| | - Esmee Wuijster
- Department of Hematology Erasmus MC, University Medical Center Rotterdam Rotterdam The Netherlands
| | - Karina Meijer
- Department of Hematology University of Groningen and University Medical Center Groningen Groningen The Netherlands
| | - Marieke J H A Kruip
- Department of Hematology Erasmus MC, University Medical Center Rotterdam Rotterdam The Netherlands
| | - Frank W G Leebeek
- Department of Hematology Erasmus MC, University Medical Center Rotterdam Rotterdam The Netherlands
| | - Marjon H Cnossen
- Department of Pediatric Hematology Erasmus MC - Sophia Children's Hospital, University Medical Center Rotterdam Rotterdam The Netherlands
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Sacco M, Lancellotti S, Branchini A, Tardugno M, Testa MF, Lunghi B, Bernardi F, Pinotti M, Giusti B, Castaman G, De Cristofaro R. The p.P1127S pathogenic variant lowers von Willebrand factor levels through higher affinity for the macrophagic scavenger receptor LRP1: Clinical phenotype and pathogenic mechanisms. J Thromb Haemost 2022; 20:1818-1829. [PMID: 35596664 PMCID: PMC9545986 DOI: 10.1111/jth.15765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 04/28/2022] [Accepted: 05/17/2022] [Indexed: 11/30/2022]
Abstract
BACKGROUND The index case is a 21-year-old Italian woman with a mild hemorrhagic syndrome and von Willebrand factor antigen (VWF:Ag) = 34.3 U/dl, VWF recombinant glycoprotein Ib (VWF:GpIbR) = 32.8 U/dl, and factor VIII (FVIII) = 55.3 IU/dl. AIMS The aim of this study is to characterize from a genetic and biochemical standpoint this low VWF phenotype. METHODS Coagulation and biochemical methods were used to study the structural and functional pattern of VWF multimers in the index case's plasma. Recombinant wild-type and p.P1127S VWF variants were produced using human embryonic kidney (HEK)-293 cells. In addition, genetic screening was carried out to detect single nucleotide variants of some scavenger VWF/FVIII receptor genes such as CLEC4M, STAB2, and ASGR2. RESULTS Genetic investigation revealed that the index case inherited from her mother the heterozygous missense mutation c.3379C > T (VWF exon 25), causing the p.P1127S substitution in the VWF D'D3 domain. The index case was also homozygous for the scavenger receptor ASGR2 c.-95 CC-genotype. Desmopressin normalized the VWF level of the patient, although its clearance was faster (t1/2 = 6.7 h) than in normal subjects (t1/2 = 12 ± 0.7 h). FVIII-VWF interaction, A Disintegrin And Metalloprotease with ThromboSpondin type 1 motif-13 levels, ristocetin-induced-platelet-aggregation, and VWF multimeric pattern were normal. The p.P1127S variant was normally synthesized and secreted by HEK-293 cells, and molecular modeling predicts a conformational change showing higher affinity for the macrophagic scavenger receptor lipoprotein receptor-related protein 1 (LRP1), as also experimentally verified. CONCLUSIONS The p.P1127S variant may cause a low VWF phenotype, stemming from an increased VWF affinity for the scavenger receptor LRP1 and, consequently, an accelerated clearance of VWF.
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Affiliation(s)
- Monica Sacco
- Dipartimento di Medicina e Chirurgia TraslazionaleFacoltà di Medicina e Chirurgia “Agostino Gemelli,” Università Cattolica S. CuoreRomaItaly
| | - Stefano Lancellotti
- Servizio Malattie Emorragiche e TromboticheFondazione Policlinico Universitario “A. Gemell” IRCCSRomaItaly
| | - Alessio Branchini
- Dipartimento di Scienze della Vita e BiotecnologieUniversità di FerraraFerraraItaly
| | - Maira Tardugno
- Dipartimento di Medicina e Chirurgia TraslazionaleFacoltà di Medicina e Chirurgia “Agostino Gemelli,” Università Cattolica S. CuoreRomaItaly
| | | | - Barbara Lunghi
- Dipartimento di Scienze della Vita e BiotecnologieUniversità di FerraraFerraraItaly
| | - Francesco Bernardi
- Dipartimento di Scienze della Vita e BiotecnologieUniversità di FerraraFerraraItaly
| | - Mirko Pinotti
- Dipartimento di Scienze della Vita e BiotecnologieUniversità di FerraraFerraraItaly
| | - Betti Giusti
- Dipartimento di Medicina Sperimentale e ClinicaUniversità di FirenzeFirenzeItaly
- Laboratorio Genetico Molecolare Avanzato, SOD Malattie AterotromboticheAzienda Ospedaliero‐ Universitaria “Careggi"FirenzeItaly
| | - Giancarlo Castaman
- Dipartimento di Oncologia, Centro Malattie Emorragiche e della CoagulazioneOspedale Universitario “Careggi”FirenzeItaly
| | - Raimondo De Cristofaro
- Dipartimento di Medicina e Chirurgia TraslazionaleFacoltà di Medicina e Chirurgia “Agostino Gemelli,” Università Cattolica S. CuoreRomaItaly
- Servizio Malattie Emorragiche e TromboticheFondazione Policlinico Universitario “A. Gemell” IRCCSRomaItaly
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Swan D, Mahlangu J, Thachil J. Non‐factor therapies for bleeding disorders: A primer for the general haematologist. EJHAEM 2022; 3:584-595. [PMID: 36051064 PMCID: PMC9422036 DOI: 10.1002/jha2.442] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 03/31/2022] [Accepted: 04/04/2022] [Indexed: 11/09/2022]
Abstract
Management of patients with severe bleeding disorders, particularly haemophilia A and B, and to a lesser extent, von Willebrand disease, has come on leaps and bounds over the past decade. Until recently, patients relied upon the administration of factor concentrates to prevent or treat bleeding episodes. Factor administration requires intravenous access and, in up to one‐third of patients, leads to the development of neutralising antibodies, or inhibitors, which are associated with more frequent bleeding episodes and higher morbidity. Novel non‐factor therapies may offer a solution to these unmet needs. In this review, we discuss the factor mimetics, particularly emicizumab, and the rebalancing agents, which inhibit antithrombin, tissue factor pathway inhibitor and activated protein C, and novel treatments to enhance von Willebrand factor levels. We review the available trial data, unanswered questions and challenges associated with these new treatment modalities. Finally, we provide practical management algorithms to aid the general haematologist when faced with a patient receiving emicizumab who requires surgery or may develop bleeding.
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Affiliation(s)
- Dawn Swan
- National University Ireland Galway Republic of Ireland
| | - Johnny Mahlangu
- Department of Molecular Medicine and Haematology School of Pathology Faculty of Health Sciences University of the Witwatersrand and NHLS Johannesburg South Africa
| | - Jecko Thachil
- Department of Haematology Manchester University Hospitals NHS Foundation Trust Manchester UK
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Pablo-Moreno JAD, Serrano LJ, Revuelta L, Sánchez MJ, Liras A. The Vascular Endothelium and Coagulation: Homeostasis, Disease, and Treatment, with a Focus on the Von Willebrand Factor and Factors VIII and V. Int J Mol Sci 2022; 23:ijms23158283. [PMID: 35955419 PMCID: PMC9425441 DOI: 10.3390/ijms23158283] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 07/22/2022] [Accepted: 07/23/2022] [Indexed: 11/27/2022] Open
Abstract
The vascular endothelium has several important functions, including hemostasis. The homeostasis of hemostasis is based on a fine balance between procoagulant and anticoagulant proteins and between fibrinolytic and antifibrinolytic ones. Coagulopathies are characterized by a mutation-induced alteration of the function of certain coagulation factors or by a disturbed balance between the mechanisms responsible for regulating coagulation. Homeostatic therapies consist in replacement and nonreplacement treatments or in the administration of antifibrinolytic agents. Rebalancing products reestablish hemostasis by inhibiting natural anticoagulant pathways. These agents include monoclonal antibodies, such as concizumab and marstacimab, which target the tissue factor pathway inhibitor; interfering RNA therapies, such as fitusiran, which targets antithrombin III; and protease inhibitors, such as serpinPC, which targets active protein C. In cases of thrombophilia (deficiency of protein C, protein S, or factor V Leiden), treatment may consist in direct oral anticoagulants, replacement therapy (plasma or recombinant ADAMTS13) in cases of a congenital deficiency of ADAMTS13, or immunomodulators (prednisone) if the thrombophilia is autoimmune. Monoclonal-antibody-based anti-vWF immunotherapy (caplacizumab) is used in the context of severe thrombophilia, regardless of the cause of the disorder. In cases of disseminated intravascular coagulation, the treatment of choice consists in administration of antifibrinolytics, all-trans-retinoic acid, and recombinant soluble human thrombomodulin.
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Affiliation(s)
- Juan A. De Pablo-Moreno
- Department of Genetics, Physiology and Microbiology, School of Biology, Complutense University, 28040 Madrid, Spain; (J.A.D.P.-M.); (L.J.S.)
| | - Luis Javier Serrano
- Department of Genetics, Physiology and Microbiology, School of Biology, Complutense University, 28040 Madrid, Spain; (J.A.D.P.-M.); (L.J.S.)
| | - Luis Revuelta
- Department of Physiology, School of Veterinary Medicine, Complutense University of Madrid, 28040 Madrid, Spain;
| | - María José Sánchez
- Centro Andaluz de Biología del Desarrollo (CABD), Consejo Superior de Investigaciones Científicas (CSIC), Junta de Andalucía, Pablo de Olavide University, 41013 Sevilla, Spain;
| | - Antonio Liras
- Department of Genetics, Physiology and Microbiology, School of Biology, Complutense University, 28040 Madrid, Spain; (J.A.D.P.-M.); (L.J.S.)
- Correspondence:
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The impact of bicuspid aortic valve morphology on von Willebrand factor function in patients with severe aortic stenosis and its change after TAVI. Clin Res Cardiol 2022; 111:1348-1357. [PMID: 35838799 DOI: 10.1007/s00392-022-02047-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Accepted: 05/30/2022] [Indexed: 11/03/2022]
Abstract
BACKGROUND Aortic stenosis (AS) can cause acquired von Willebrand syndrome (AVWS) and valve replacement has been shown to lead to von Willebrand factor (vWF) recovery. The aim of the current study was to investigate the prevalence of AVWS in different severe AS phenotypes and its course after transcatheter aortic valve implantation (TAVI). METHODS 143 patients with severe AS undergoing TAVI were included in the study. vWF function was assessed at baseline, 6 and 24 h after TAVI. AVWS was defined as a reduced vWF:Ac/Ag ratio ≤ 0.7. Phenotypes were classified by tricuspid (TAV) and bicuspid (BAV) valve morphology, mean transvalvular gradient (Pmean), stroke volume index (SVI), ejection fraction (EF) and indexed effective orifice area (iEOA). RESULTS AVWS was present in 36 (25.2%) patients before TAVI. vWF:Ac/Ag ratio was significantly lower in high gradient compared to low-gradient severe AS [0.78 (IQR 0.67-0.86) vs. 0.83 (IQR 0.74-0.93), p < 0.05] and in patients with BAV compared to TAV [0.70 (IQR 0.63-0.78) vs. 0.81 (IQR 0.71-0.89), p < 0.05]. Normalization of vWF:Ac/Ag ratio was achieved in 61% patients 24 h after TAVI. As in the overall study cohort, vWF:Ac/Ag ratio increased significantly in all severe AS subgroups 6 h after TAVI (each p < 0.05). Regarding binary logistic regression analysis, BAV was the only significant predictor for AVWS. CONCLUSIONS BAV morphology is a strong predictor for AVWS in severe AS. TAVI restores vWF function in most patients with severe AS independently of AS phenotype and valve morphology.
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146
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Phenotypic and genetic characterizations of the Milan cohort of von Willebrand disease type 2. Blood Adv 2022; 6:4031-4040. [PMID: 35452508 PMCID: PMC9278302 DOI: 10.1182/bloodadvances.2022007216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 04/06/2022] [Indexed: 11/20/2022] Open
Abstract
von Willebrand disease (VWD) type 2 is caused by qualitative abnormalities of von Willebrand factor (VWF). This study aimed to determine the genotypic and phenotypic characterizations of a large VWD type 2 cohort from Milan. We included 321 patients (54% female) within 148 unrelated families from 1995 to 2021. Patients were fully characterized using laboratory phenotypic tests, and the genotypic diagnosis was confirmed by target genetic analysis using Sanger sequencing. Patients were diagnosed with type 2A (n = 98; 48 families), 2B (n = 85; 38 families), 2M (n = 112; 50 families), or 2N (n = 26; 12 families). Eighty-two unique VWF variants, including 8 novel variants, were found. The potential pathogenic effect of novel variants was assessed by in silico analysis. Most patients were heterozygous for a single variant (n = 259; 81%), whereas 37 cases (11%) had 2 variants (4 homozygous, 9 in trans, and 24 in cis). Twenty-five patients (8%) had ≥3 variants, mainly as a result of gene conversions. Among the 82 distinct variants identified, 5 different types, including missense (n = 64), gene conversion (n = 10), synonymous (n = 1), deletion (n = 4), and splice (n = 3), were observed. The results from this large cohort showed that VWD type 2 is invariably due to variants that do not prevent the synthesis of the protein, and a vast majority of patients (88%) had missense variants. Given the complexity of type 2 diagnosis and the necessity of performing several phenotypic tests, genetic analysis for patients suspected of having type 2 is beneficial to establish the correct diagnosis.
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147
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Favaloro EJ, Dean E, Arunachalam S. Evaluating Performance of Contemporary and Historical von Willebrand Factor (VWF) Assays in the Laboratory Identification of von Willebrand Disease (VWD): The Australasian Experience. Semin Thromb Hemost 2022; 48:711-731. [PMID: 35803263 DOI: 10.1055/s-0042-1753528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
von Willebrand disease (VWD) is a common bleeding disorder that arises from deficiency and/or defects of von Willebrand factor (VWF). Appropriate diagnosis of VWD, including differential identification of qualitative (types 2A, 2B, 2M, 2N VWD) versus quantitative (types 1 and 3 VWD) defects remains problematic but has important management implications, given differential therapy. Complete assessment for VWD in a patient with a bleeding history requires comprehensive test panels, including VWF activity and antigen. We describe the Australasian experience, using data from the Royal College of Pathologists of Australasia (RCPA) Quality Assurance Program (QAP) related to VWF testing in their VWD test module. The RCPAQAP has been providing samples for VWF testing since 1998, representing 25 years of proficiency testing related to VWD diagnosis. A total of 109 samples have been dispatched to participants over these years, with current assessment involving dispatches of two samples (=4 samples) per year. Samples have represented all types of VWD, as well as normal or other samples, including acquired von Willebrand syndrome and plasma VWF concentrates as used in VWD therapy. Different VWF assays and activity/antigen ratios show different utility in VWD and type identification. In the past 9 years of data capture, a total of 166 errors were identified from a total of 1,839 interpretations, representing a base error rate of 9.0%. Identification errors were highest for type 2 VWD samples (15.3%), intermediate for type 1 VWD samples (7.5%), and lowest for normal samples (2.4%). Errors can be linked to assay limitations, including assay variability and low-level VWF detection limits, as well as laboratory issues (including test result misinterpretation, which accounts for approximately 40% of all errors for type 2 VWD). For test-associated errors, VWF:RCo and VWF:GPIbM were associated with the highest variability and error rate, which was up to 10x higher than that using VWF:CB. As a test group, chemiluminescence-based procedures were associated with lowest inter-laboratory variability, best low-level VWF detection (down to <1 U/dL), and least errors overall. These findings inform on reasons behind high rates of errors associated with VWD diagnosis, with some assays and methodologies performing substantially better than others.
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Affiliation(s)
- Emmanuel J Favaloro
- Department of Haematology, Institute of Clinical Pathology and Medical Research (ICPMR), NSW Health Pathology, Westmead Hospital, Westmead, New South Wales, Australia.,Sydney Centers for Thrombosis and Haemostasis, Westmead, New South Wales Australia.,Faculty of Science and Health, Charles Sturt University, Wagga Wagga, New South Wales, Australia
| | - Elysse Dean
- RCPAQAP Haematology, St Leonards, New South Wales, Australia
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148
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Interaction of von Willebrand factor with blood cells in flow models: a systematic review. Blood Adv 2022; 6:3979-3990. [PMID: 35816358 PMCID: PMC9278308 DOI: 10.1182/bloodadvances.2021006405] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 05/02/2022] [Indexed: 11/29/2022] Open
Abstract
The presence of blood flow influences the interaction between von Willebrand factor (VWF) and blood cells, affecting characteristics of forming blood clots. The interactions between coagulation and inflammation have mainly been studied in thrombosis models, but it remains unclear whether these interactions might also play a role in reduced bleeding in patients with bleeding disorders. In this systematic review, we provide an overview of the literature investigating the interactions between VWF and blood cells in flow models. For article selection, a systematic search was performed in Embase, Medline-Ovid, Cochrane Library, Web of Science databases, and Google Scholar. After selection, 24 articles were included. These articles describe direct or platelet-dependent interactions between VWF and neutrophils, monocytes, erythrocytes, or lymphocytes under different flow conditions. Almost all the described interactions required the presence of activated platelets. Only erythrocytes, monocytes, and natural killer cells were capable of directly binding the VWF multimers. Overall, interactions between VWF and blood cells mainly occurred in the presence of platelets. Because of the large variation in study design and used flow rates, further research is necessary to compare the results between studies and draw firm conclusions on when and under what conditions these interactions can occur. After our findings, many questions remained unanswered. This review might provide a starting point for future research. Extended knowledge on the influence of blood flow on VWF and blood cell interactions can contribute to improved understanding of the variation in bleeding in patients with bleeding disorders.
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149
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Johnsen JM, MacKinnon HJ. JTH in Clinic - Obstetric bleeding: VWD and other inherited bleeding disorders. J Thromb Haemost 2022; 20:1568-1575. [PMID: 35621921 DOI: 10.1111/jth.15770] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2022] [Accepted: 05/25/2022] [Indexed: 01/19/2023]
Abstract
Individuals with inherited bleeding disorders (IBDs) have higher bleeding risk during pregnancy, childbirth, and the postpartum period. Clinical management requires recognition of the IBD as high risk for postpartum hemorrhage and a personalized multidisciplinary approach that includes the patient in decision making. When the fetus is known or at risk to inherit a bleeding disorder, fetal and neonatal bleeding risk also need to be considered. In pregnant IBD patients, it is common for providers to need to make decisions in the absence of high level of certainty evidence. We here present the case of a pregnant von Willebrand disease patient that reached multiple decision points where there is currently clinical ambiguity due to a lack of high level of certainty evidence. For each stage of her care, from diagnosis to the postpartum period, we discuss current literature and describe our approach. This is followed by a brief overview of considerations in other IBDs and pregnancy.
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Affiliation(s)
- Jill M Johnsen
- Bloodworks Research Institute, Seattle, WA, USA
- Department of Medicine, University of Washington, Seattle, Washington, USA
- Washington Center for Bleeding Disorders, Seattle, Washington, USA
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150
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Laoaroon N, Empremsilapa S, Sirachainan N. Pediatric standardized bleeding assessment tool for screening bleeding disorder in school-age children. Hematol Transfus Cell Ther 2022; 44:453-455. [PMID: 35110001 PMCID: PMC9477776 DOI: 10.1016/j.htct.2021.11.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 09/02/2021] [Accepted: 11/19/2021] [Indexed: 11/30/2022] Open
Affiliation(s)
- Napat Laoaroon
- Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand; Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | | | - Nongnuch Sirachainan
- Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
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