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Evaluation of clinical severity in patients with type 2N von Willebrand disease using microchip-based flow-chamber system

  • Yuto Nakajima
  • Keiji NogamiEmail author
  • Koji Yada
  • Takeshi Kawamura
  • Kenichi Ogiwara
  • Shoko Furukawa
  • Naruto Shimonishi
  • Masahiro Takeyama
  • Midori Shima
Original Article
  • 58 Downloads

Abstract

Type 2N von Willebrand disease (VWD) is characterized by impaired factor VIII (FVIII) binding to von Willebrand factor (VWF). Type 2N VWD patients generally exhibit mild bleeding tendency, but some exhibit a more severe hemorrhagic pattern. An assay for assessing hemostatic potential and predict clinical severity could significantly improve clinical management in these patients. We examined the relationship between bleeding score (BS) and the potential for thrombus formation in whole blood from type 2N VWD patients with various BS using rotational thromboelastometry (ROTEM) and microchip flow-chamber system (T-TAS®). Collagen-coated PL-chips, or thromboplastin- and collagen-coated AR-chips, were utilized in the T-TAS to assess platelet thrombus formation at high shear flow, or fibrin-rich platelet thrombus formation at low shear flow, respectively. Neither ROTEM nor the T-TAS using PL-chips reflected the BS. The AR-chip parameters in the T-TAS, however, were highly sensitive to different BS levels among these patients, despite similar FVIII/VWF-related measurements including FVIII/VWF binding. Additionally, the results with AR-chip assay were restored to normal after infusions of FVIII/VWF concentrates in the most severe patients. The data indicate that T-TAS using AR-chips may be a useful assay for predicting clinical severity and assessing therapeutic efficiency in type 2N VWD patients.

Keywords

Microchip flow-chamber system Type 2N von willebrand disease Von willebrand factor Bleeding score Clinical severity 

Notes

Acknowledgements

We greatly thank Prof. Dr. Yoshiaki Tomiyama (Osaka University) and Dr. Hiroyuki Sugawara (Sumitomo Hospital) who was the patients’ home doctor for keeping the patients’ condition stable for a long term.

Author contributions

YN: analyzed the data, made the figure, wrote the paper; KN: ran the clinic, performed the experiments, designed the research, interpreted the data, wrote the paper, edited the manuscript and approved the final version to be published, TK: analyzed VWF gene, KY, KO, SF, NS, MT: ran the clinic and performed the experiments; MS: supervised the research.

Funding

This work was partly supported by a Grant-in-Aid for Scientific Research (KAKENHI) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) to KN (Grant No. 18K07885).

Compliance with ethical standards

Conflict of interest

The authors have no conflicts of interest to disclose.

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Copyright information

© Japanese Society of Hematology 2019

Authors and Affiliations

  • Yuto Nakajima
    • 1
  • Keiji Nogami
    • 1
    Email author
  • Koji Yada
    • 1
    • 2
  • Takeshi Kawamura
    • 1
  • Kenichi Ogiwara
    • 1
  • Shoko Furukawa
    • 1
    • 3
  • Naruto Shimonishi
    • 1
  • Masahiro Takeyama
    • 1
  • Midori Shima
    • 1
  1. 1.Department of PediatricsNara Medical UniversityKashiharaJapan
  2. 2.The Course of Hemophilia EducationNara Medical UniversityKashiharaJapan
  3. 3.The Course of Thrombosis and Hemostasis Molecular PathologyNara Medical UniversityKashiharaJapan

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