Incidence of venous and arterial thromboembolic complications in COVID-19: A systematic review and meta-analysisTo the Editors Arterial thrombotic disease (atherosclerotic cardiovascular disease, CVD) and venous thromboembolism (VTE) (comprising of deep vein thrombosis (DVT) and pulmonary embolism (PE)), two distinct but closely related diseases, [1] constitute major public health problems and are associated with substantial morbidity, premature mortality, and high economic costs. The coronavirus disease 2019 (COVID-19) pandemic which is one of the most significant modern-day public health challenges, predominantly affects the respiratory system, causing severe pneumonia and respiratory distress syndrome. Emerging data suggests COVID-19 adversely affects multiple organs; gastrointestinal, liver, kidney, neurological and cardiac complications have been reported [2][3][4]. Apart from pre-existing comorbidities such as CVD, hypertension, chronic kidney disease, chronic liver disease and diabetes being linked to increased risk of severe illness or death; [5] some extrapulmonary complications of COVID-19 such as acute myocardial injury have been shown to be associated with fatal outcomes [6]. Recently, COVID-19 has been linked to venous and arterial thromboembolic disease (henceforth referred to as thromboembolic complications). Three recent most downloaded and key studies published in the journal reported a high incidence of thromboembolic complications in COVID-19 patients, particularly in those admitted to the intensive care unit (ICU) [7][8][9]. Given the sparseness of the data and evolving nature of the disease, the thromboembolic complications of COVID-19 and their incidence estimates are not clearly defined. There is a need for robust aggregation of data on thromboembolic complications of COVID-19, which will be of great value for policy makers, healthcare providers and clinicians to aid decision making and implementing more efficacious preventative strategies. In this context, we conducted a systematic review and meta-analysis to attempt to address the following questions: (i) what are the thromboembolic complications associated with what is the incidence of these complications overall and in those who develop severe disease?The review was conducted in accordance with PRISMA and MOOSE guidelines (Supplementary Materials 1-2). We searched MEDLINE and Embase from January 2020 to 6 August 2020 for published studies reporting on venous and arterial thromboembolic complications (e.g., VTE, PE, myocardial infarction (MI), acute coronary syndrome (ACS), ischemic stroke, disseminated intravascular coagulation (DIC)) in patients with COVID-19. Studies based on selected patients/populations (eg, cancer patients) were not included. Details of the search strategy fection. A scoping review, Thromb. Res. 192 (2020) 152-160.