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Long VITT: A case report.

Guillaume Roberge1, Marc Carrier2

  • 1Centre d'Excellence des Maladies Vasculaires, Centre Hospitalier Universitaire de Québec, Hôpital Saint-François d'Assise, Université Laval, Québec, Canada.

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|January 29, 2023
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Summary
This summary is machine-generated.

Vaccine-induced immune thrombotic thrombocytopenia (VITT) can persist long-term, with one patient showing prolonged symptoms and positive tests for over 18 months. Further research is needed for optimal long-term VITT management.

Keywords:
ThrombocytopeniaThrombosisVaccineVaccine-induced immune thrombotic thrombocytopenia

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Area of Science:

  • Immunology
  • Hematology
  • Vaccinology

Background:

  • Vaccine-induced immune thrombotic thrombocytopenia (VITT) is a serious complication of adenovirus vector COVID-19 vaccines.
  • Diagnosis relies on anti-PF4 antibodies and platelet activation assays, but long-term management remains undefined.

Observation:

  • A case of VITT is presented, characterized as "long VITT," with persistent thrombocytopenia and positive platelet-activation tests for over 18 months.
  • The patient experienced severe thrombotic events including limb ischemia, pulmonary embolism, and cerebral vein thrombosis, treated with anticoagulation and immunosuppression.

Findings:

  • Despite treatment and resolution of acute events, the patient continues to exhibit thrombocytopenia and positive platelet-activation tests.
  • The persistence of anti-PF4 antibodies and its contribution to ongoing thrombocytopenia are unclear, potentially influenced by alcohol consumption.

Implications:

  • Managing long VITT presents challenges due to uncertainties in long-term anticoagulation risks and benefits.
  • Defining long VITT may require persistent positive tests and clinical manifestations beyond 3 months, necessitating further research for optimal patient care.