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Higher blood nitrate and nitrite levels have been found in coronavirus disease 2019 (COVID-19) patients than in healthy subjects. The present study explores the potential association between serum nitrate levels and mortality in COVID-19 patients. A prospective observation study was carried out. Eight Intensive Care Units (ICUs) from 6 hospitals in the Canary Islands (Spain). COVID-19 patients admitted to the ICU. Determination of serum nitrate levels at ICU admission. Mortality at 30 days. Non-surviving (n=11) compared to surviving patie