• Dutch COVID & Thrombosis Coalition, F H J Kaptein, M A M Stals, M Grootenboers, S J E Braken, J L I Burggraaf, B C T van Bussel, S C Cannegieter, H Ten Cate, H Endeman, D A M P J Gommers, C van Guldener, E de Jonge, N P Juffermans, K M Kant, M E Kevenaar, S Koster, KroftL J MLJMDepartment of Radiology, Leiden University Medical Center, Leiden, the Netherlands., KruipM J H AMJHADepartment of Hematology, Erasmus MC, Erasmus University Medical Center, Rotterdam, the Netherlands., J Leentjens, C Marechal, Y L Soei, L Tjepkema, C Visser, F A Klok, and M V Huisman.
• Department of Thrombosis and Hemostasis, Leiden University Medical Center, Leiden, the Netherlands.
• Thromb. Res. 2021 Mar 1; 199: 143-148.

IntroductionIn the first wave, thrombotic complications were common in COVID-19 patients. It is unknown whether state-of-the-art treatment has resulted in less thrombotic complications in the second wave.MethodsWe assessed the incidence of thrombotic complications and overall mortality in COVID-19 patients admitted to eight Dutch hospitals between September 1st and November 30th 2020. Follow-up ended at discharge, transfer to another hospital, when they died, or on November 30th 2020, whichever came first. Cumulative incidences were estimated, adjusted for competing risk of death. These were compared to those observed in 579 patients admitted in the first wave, between February 24th and April 26th 2020, by means of Cox regression techniques adjusted for age, sex and weight.ResultsIn total 947 patients with COVID-19 were included in this analysis, of whom 358 patients were admitted to the ICU; 144 patients died (15%). The adjusted cumulative incidence of all thrombotic complications after 10, 20 and 30 days was 12% (95% confidence interval (CI) 9.8-15%), 16% (13-19%) and 21% (17-25%), respectively. Patient characteristics between the first and second wave were comparable. The adjusted hazard ratio (HR) for overall mortality in the second wave versus the first wave was 0.53 (95%CI 0.41-0.70). The adjusted HR for any thrombotic complication in the second versus the first wave was 0.89 (95%CI 0.65-1.2).ConclusionsMortality was reduced by 47% in the second wave, but the thrombotic complication rate remained high, and comparable to the first wave. Careful attention to provision of adequate thromboprophylaxis is invariably warranted.Copyright © 2021 The Author. Published by Elsevier Ltd.. All rights reserved.

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