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Louka M, Kaliviotis E. Development of an Optical Method for the Evaluation of Whole Blood Coagulation. BIOSENSORS-BASEL 2021; 11:bios11040113. [PMID: 33918734 PMCID: PMC8069220 DOI: 10.3390/bios11040113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 04/02/2021] [Accepted: 04/06/2021] [Indexed: 12/21/2022]
Abstract
Blood coagulation is a defense mechanism, which is activated in case of blood loss, due to vessel damage, or other injury. Pathological cases arise from malfunctions of the blood coagulation mechanism, and rapid growth of clots results in partially or even fully blocked blood vessel. The aim of this work is to characterize blood coagulation, by analyzing the time-dependent structural properties of whole blood, using an inexpensive design and robust processing approaches. The methods used in this work include brightfield microscopy and image processing techniques, applied on finger-prick blood samples. The blood samples were produced and directly utilized in custom-made glass microchannels. Color images were captured via a microscopy-camera setup for a period of 35 min, utilizing three different magnifications. Statistical information was extracted directly from the color components and the binary conversions of the images. The main advantage in the current work lies on a Boolean classification approach utilized on the binary data, which enabled to identify the interchange between specific structural elements of blood, namely the red blood cells, the plasma and the clotted regions, as a result of the clotting process. Coagulation indices produced included a bulk coagulation index, a plasma-reduction based index and a clot formation index. The results produced with the inexpensive design and the low computational complexity in the current approach, show good agreement with the literature, and a great potential for a robust characterization of blood coagulation.
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Connell NT, Flood VH, Brignardello-Petersen R, Abdul-Kadir R, Arapshian A, Couper S, Grow JM, Kouides P, Laffan M, Lavin M, Leebeek FWG, O'Brien SH, Ozelo MC, Tosetto A, Weyand AC, James PD, Kalot MA, Husainat N, Mustafa RA. ASH ISTH NHF WFH 2021 guidelines on the management of von Willebrand disease. Blood Adv 2021; 5:301-325. [PMID: 33570647 PMCID: PMC7805326 DOI: 10.1182/bloodadvances.2020003264] [Citation(s) in RCA: 155] [Impact Index Per Article: 51.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 10/27/2020] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND von Willebrand disease (VWD) is a common inherited bleeding disorder. Significant variability exists in management options offered to patients. OBJECTIVE These evidence-based guidelines from the American Society of Hematology (ASH), the International Society on Thrombosis and Haemostasis (ISTH), the National Hemophilia Foundation (NHF), and the World Federation of Hemophilia (WFH) are intended to support patients, clinicians, and health care professionals in their decisions about management of VWD. METHODS ASH, ISTH, NHF, and WFH formed a multidisciplinary guideline panel. Three patient representatives were included. The panel was balanced to minimize potential bias from conflicts of interest. The University of Kansas Outcomes and Implementation Research Unit and the McMaster Grading of Recommendations Assessment, Development and Evaluation (GRADE) Centre supported the guideline development process, including performing and updating systematic evidence reviews (through November 2019). The panel prioritized clinical questions and outcomes according to their importance to clinicians and patients. The panel used the GRADE approach, including GRADE Evidence-to-Decision frameworks, to assess evidence and make recommendations, which were subject to public comment. RESULTS The panel agreed on 12 recommendations and outlined future research priorities. CONCLUSIONS These guidelines make key recommendations regarding prophylaxis for frequent recurrent bleeding, desmopressin trials to determine therapy, use of antiplatelet agents and anticoagulant therapy, target VWF and factor VIII activity levels for major surgery, strategies to reduce bleeding during minor surgery or invasive procedures, management options for heavy menstrual bleeding, management of VWD in the context of neuraxial anesthesia during labor and delivery, and management in the postpartum setting.
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Affiliation(s)
- Nathan T Connell
- Hematology Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Veronica H Flood
- Versiti Blood Research Institute, Medical College of Wisconsin, Milwaukee, WI
| | | | - Rezan Abdul-Kadir
- Department of Obstetrics and Gynaecology and Katharine Dormandy Haemophilia and Thrombosis Centre, Royal Free Foundation Hospital and Institute for Women's Health, University College London, London, United Kingdom
| | | | | | - Jean M Grow
- Department of Strategic Communication, Marquette University, Milwaukee, WI
| | - Peter Kouides
- Mary M. Gooley Hemophilia Treatment Center, University of Rochester, Rochester, NY
| | - Michael Laffan
- Centre for Haematology, Imperial College London, London, United Kingdom
| | - Michelle Lavin
- Irish Centre for Vascular Biology, Royal College of Surgeons in Ireland and National Coagulation Centre, St James's Hospital, Dublin, Ireland
| | - Frank W G Leebeek
- Department of Hematology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Sarah H O'Brien
- Division of Hematology/Oncology, Department of Pediatrics, Nationwide Children's Hospital, The Ohio State University College of Medicine, Columbus, OH
| | | | - Alberto Tosetto
- Hemophilia and Thrombosis Center, Hematology Department, S. Bortolo Hospital, Vicenza, Italy
| | - Angela C Weyand
- Department of Pediatrics, University of Michigan Medical School, Ann Arbor, MI
| | - Paula D James
- Department of Medicine, Queen's University, Kingston, ON, Canada; and
| | - Mohamad A Kalot
- Outcomes and Implementation Research Unit, Division of Nephrology and Hypertension, Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS
| | - Nedaa Husainat
- Outcomes and Implementation Research Unit, Division of Nephrology and Hypertension, Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS
| | - Reem A Mustafa
- Outcomes and Implementation Research Unit, Division of Nephrology and Hypertension, Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS
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Sood SL, Cuker A, Wang C, Metjian AD, Chiang EY, Soucie JM, Konkle BA. Similarity in joint function limitation in Type 3 von Willebrand's disease and moderate haemophilia A. Haemophilia 2013; 19:595-601. [PMID: 23534856 DOI: 10.1111/hae.12119] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/15/2013] [Indexed: 11/29/2022]
Abstract
Type 3 von Willebrand's disease (VWD) is a rare bleeding diathesis with complete or near complete deficiency of von Willebrand factor (VWF) and low factor VIII (FVIII) levels. In contrast, only FVIII is decreased in haemophilia A (HA). Both disorders are complicated by arthropathy. The purpose of this study was to further clarify the roles of FVIII and VWF: Antigen (VWF:Ag) in joint range of motion (ROM) loss over time. We compared joint ROM loss and other bleeding manifestations in 100 Type 3 VWD subjects (FVIII<5%) and 1814 moderate HA subjects (FVIII 1-5%) within the U.S. Universal Data Collection (UDC) database. High rates of bleeding were reported at baseline. During follow-up, moderate HA patients reported a joint (46% vs. 34%, P < 0.0001) or muscle bleed (27% vs. 16%, P < 0.0001) in a higher proportion of visits than VWD patients. Other bleeds, including mucosal, were reported in a greater proportion of visits among patients with Type 3 VWD than among those with HA (49% vs. 32%, P < 0.0001). Multivariate analysis revealed no difference in joint ROM loss over time in the Type 3 VWD vs. moderate HA populations. A higher FVIII level was protective in both VWD and HA (P < 0.001). Our findings support the hypothesis of primacy of the FVIII level in determining risk of joint haemorrhage, and may help target therapy in Type 3 VWD and moderate HA to prevent joint disability.
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Affiliation(s)
- S L Sood
- Hemophilia and Coagulation Disorders Program, Division of Hematology-Oncology, University of Michigan School of Medicine, Ann Arbor, MI 48109, USA.
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Berntorp E, Peake I, Budde U, Laffan M, Montgomery R, Windyga J, Goodeve A, Petrini P, von Depka M, Miesbach W, Lillicrap D, Federici AB, Lassila R, White G. von Willebrand's disease: a report from a meeting in the Åland islands. Haemophilia 2012; 18 Suppl 6:1-13. [PMID: 22906074 DOI: 10.1111/j.1365-2516.2012.02925.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
von Willebrand's disease (VWD) is probably the most common bleeding disorder, with some studies indicating that up to 1% of the population may have the condition. Over recent years interest in VWD has fallen compared to that of haemophilia, partly the result of focus on blood-borne diseases such as HIV and hepatitis. Now the time has come to revisit VWD, and in view of this some 60 international physicians with clinical and scientific interest in VWD met over 4 days in 2010 in the Åland islands to discuss state-of-the-art issues in the disease. The Åland islands are where Erik von Willebrand had first observed a bleeding disorder in a number of members of a family from Föglö, and 2010 was also the 140th anniversary of his birth. This report summarizes the main papers presented at the symposium; topics ranged from genetics and biochemistry through to classification of VWD, pharmacokinetics and laboratory assays used in the diagnosis of the disease, inhibitors, treatment guidelines in different age groups including the elderly who often have comorbid conditions that present challenges, and prophylaxis. Other topics included managing surgeries in patients with VWD and the role of FVIII in VWF replacement, a controversial subject.
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Affiliation(s)
- E Berntorp
- Lund University, Department of Hematology and Coagulation Disorders Skåne University Hospital, Malmö, Sweden
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Abstract
The goal of this review is to briefly summarize the two primary pathways of hemostasis, primary hemostasis and secondary hemostasis, as well as to summarize anticoagulant mechanisms and fibrinolysis. In addition, this review will discuss pathologies of hemostasis and the mechanisms of the various drugs that are available to impact these pathways to prevent either thrombosis or bleeding. While many of the main drugs that are used to treat disorders of hemostasis have been used for decades, greater understanding of hemostasis has led to development of various new drugs that have come onto the market recently or are close to coming onto the market. Thus, improved understanding of hemostasis continues to lead to benefits for patients.
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Affiliation(s)
- Andrew J Gale
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA.
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