COVID-19-related thrombosis in Japan: Final report of a questionnaire-based survey in 2020

Hisanori Horiuchi, Eriko Morishita, Tetsumei Urano, Kenji Yokoyama

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


A questionnaire on COVID-19-related thrombosis in patients hospitalized before Aug 31, 2020, was sent to 399 hospitals throughout Japan. Responses were received from 111 (27.8%) with information on 6,202 COVID-19 patients. Of these, 333 and 56 required ventilation or extracorporeal membrane oxygenation (ECMO), respectively, and 212 died (3.4%). D-dimer levels were measured in 75.0% of the patients, revealing that 9.2% and 7.6% exhibited D-dimer increases of 3-8-fold and ≤8-fold the reference value, respectively. Thrombotic events occurred in 108 patients (1.86% of the 5,807 patients with available data) including symptomatic cerebral infarction in 24, myocardial infarction in 7, deep vein thrombosis in 41, pulmonary thromboembolism in 30, and other thrombotic events in 22. Some patients developed multiple thrombotic events. Thrombosis occurred in 32 patients with mild or moderate COVID-19 severity (0.59% of those with data available) and in 52 patients on ventilation or ECMO (13.5% of severe patients for whom data were available). Thrombosis occurred in 67 patients during worsening clinical condition and in 26 during recovery. Anticoagulant therapy was provided to 893 patients (14.6% of the 6,119 patients with available data), the main reasons being provided as elevated D-dimer levels and worsening clinical condition.

Original languageEnglish
Pages (from-to)406-416
Number of pages11
JournalJournal of atherosclerosis and thrombosis
Issue number4
Publication statusPublished - 2021


  • COVID-19
  • Cerebral infarction
  • D-dimer
  • Thrombosis
  • Venous thromboembolism

ASJC Scopus subject areas

  • Internal Medicine
  • Cardiology and Cardiovascular Medicine
  • Biochemistry, medical


Dive into the research topics of 'COVID-19-related thrombosis in Japan: Final report of a questionnaire-based survey in 2020'. Together they form a unique fingerprint.

Cite this