• Rahul Chaudhary, Leslie Padrnos, Ewa Wysokinska, Rajiv Pruthi, Sanjay Misra, Meera Sridharan, Waldemar Wysokinski, Robert D McBane, and Damon E Houghton.
• Division of Hospital Internal Medicine, Department of Internal Medicine, Mayo Clinic, Rochester, MN; Division of Cardiology, University of Pittsburgh Medical Center Heart and Vascular Institute, Pittsburgh, PA. Electronic address: rahul.chaudhary.md@outlook.com.
• Mayo Clin. Proc. 2021 Jul 1; 96 (7): 1718-1726.

ObjectiveTo determine the difference in the rate of thromboembolic complications between hospitalized coronavirus disease 2019 (COVID-19)-positive compared with COVID-19-negative patients.Patients And MethodsAdult patients hospitalized from January 1, 2020, through May 8, 2020, who had COVID-19 testing by polymerase chain reaction assay were identified through electronic health records across multiple hospitals in the Mayo Clinic enterprise. Thrombotic outcomes (venous and arterial) were identified from the hospital problem list.ResultsWe identified 3790 hospitalized patients with COVID-19 testing across 19 hospitals, 102 of whom had positive test results. The median age was lower in the COVID-positive patients (62 vs 67 years; P=.03). The median duration of hospitalization was longer in COVID-positive patients (8.5 vs 4 days; P<.001) and more required intensive care unit care (56.9% [58 of 102] vs 26.8% [987 of 3688]; P<.001). Comorbidities, including atrial fibrillation/flutter, heart failure, chronic kidney disease, and malignancy, were observed less frequently with COVID-positive admissions. Any venous thromboembolism was identified in 2.9% of COVID-positive patients (3 of 102) and 4.6% of COVID-negative patients (168 of 3688). The frequency of venous and arterial events was not different between the groups. The unadjusted odds ratio (OR) for COVID-positive-patients for any venous thromboembolism was 0.63 (95% CI, 0.19 to 2.02). A multivariable logistic regression model evaluated death within 30 days of hospital discharge; neither COVID positivity (adjusted OR, 1.12; 95% CI, 0.54 to 2.34) nor thromboembolism (adjusted OR, 0.90; 95% CI, 0.60 to 1.32) was associated with death.ConclusionEarly experience in patients with COVID-19 across multiple academic and regional hospitals representing different US regions demonstrates a lower than previously reported incidence of thrombotic events. This incidence was not higher than a contemporary COVID-negative hospitalized comparator.Copyright © 2021 Mayo Foundation for Medical Education and Research. Published by Elsevier Inc. All rights reserved.

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