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Background: The link between coagulation system disorders and COVID-19 has not yet been fully elucidated. Aim: Evaluating the association of non-previously reported coagulation proteins with COVID-19 severity and mortality. Design: Cross-sectional study of 134 COVID-19 patients recruited at admission and classified according to the highest COVID-19 severity reached (asymptomatic/mild, moderate, or severe) and 16 healthy control individuals. Methods: Coagulation proteins levels (antithrombin, prothrombin, factor_XI, factor_XII, and factor_XIII) and CRP were measured in plasma by the ProcartaPlex Panel (Invitrogen) multiplex immunoassay upon diagnosis. Results: We found higher levels of antithrombin, prothrombin, factor XI, factor XII, and factor XIII in asymptomatic/mild and moderate COVID-19 patients compared to healthy individuals. Interestingly, decreased levels of antithrombin and factors XI, XII, and XIII were observed in those patients who eventually developed severe illness. Additionally, survival models showed us that patients with lower levels of these coagulation proteins had an increased risk of death. Conclusion: COVID-19 provokes early increments of some specific coagulation proteins in most patients. However, lower levels of these proteins at diagnosis might "paradoxically" imply a higher risk of progression to severe disease and COVID-19-related mortality., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Ceballos, Ryan, Blancas, Martin-Vicente, Vidal-Alcántara, Peréz-García, Bartolomé, Churruca-Sarasqueta, Virseda-Berdices, Martínez-González, Brochado-Kith, Rava, Vilches-Medkouri, Blanca-López, Ramirez Martinez-Acitores, Moreira-Escriche, De Juan, Resino, Fernández-Rodríguez and Jiménez-Sousa.)

Background: The COVID-19 outbreak has affected almost all hospital departments, including transfusion services. However, the demand for transfusions in a general hospital designated to deal with COVID-19 patients has not been analysed before., Study Design and Methods: A retrospective study was conducted to evaluate blood transfusion practices from 15 March to 14 April 2020 at Hospital Universitario Infanta Leonor (Madrid, Spain). During this month, with few exceptions, the hospital became a 'COVID-19' centre. In addition, transfusion rates during this time frame and the same period over the last 4 years were compared., Results: From 15 March to 14 April 2020, only 254 blood components were transfused, resulting in a 49·3% reduction over the previous year. Interestingly, in critically ill patients, the red blood cell (RBC) transfusion/bed ratio significantly decreased during this period (0·92) compared to the same ratio over the past 4 years (2·70) (P = 0·02). Of note, 106 blood components (95 RBC; 11 platelet concentrates) were transfused to only 36 out of 1348 COVID-19 patients (2·7%). The main reason for RBC transfusion in COVID-19 patients was a previous underlying disease (44%) followed by bleeding (25%) and inflammatory anaemia (25%)., Conclusion: This is the first study to report a decrease in blood transfusions during the COVID-19 pandemic in a general hospital and especially in the intensive care unit. The results of this study suggest that COVID-19 does not generally induce transfusion requiring anaemia, being the main causes for transfusion in these patients underlying conditions or bleeding., (© 2020 International Society of Blood Transfusion.)

Recent studies suggest that thrombotic complications are a common phenomenon in the novel SARS-CoV-2 infection. The main objective of our study is to assess cumulative incidence of pulmonary embolism (PE) in non critically ill COVID-19 patients and to identify its predicting factors associated to the diagnosis of pulmonary embolism. We retrospectevely reviewed 452 electronic medical records of patients admitted to Internal Medicine Department of a secondary hospital in Madrid during Covid 19 pandemic outbreak. We included 91 patients who underwent a multidetector Computed Tomography pulmonary angiography(CTPA) during conventional hospitalization. The cumulative incidence of PE was assessed ant the clinical, analytical and radiological characteristics were compared between patients with and without PE. PE incidence was 6.4% (29/452 patients). Most patients with a confirmed diagnosed with PE recieved low molecular weight heparin (LMWH): 79.3% (23/29). D-dimer peak was significatly elevated in PE vs non PE patients (14,480 vs 7230 mcg/dL, p = 0.03). In multivariate analysis of patients who underwent a CTPA we found that plasma D-dimer peak was an independen predictor of PE with a best cut off point of > 5000 µg/dl (OR 3.77; IC95% (1.18-12.16), p = 0.03). We found ninefold increased risk of PE patients not suffering from dyslipidemia (OR 9.06; IC95% (1.88-43.60). Predictive value of AUC for ROC is 75.5%. We found a high incidence of PE in non critically ill hospitalized COVID 19 patients despite standard thromboprophylaxis. An increase in D-dimer levels is an independent predictor for PE, with a best cut-off point of > 5000 µg/ dl.