Abstract
BACKGROUND: Coronavirus disease 2019 (COVID-19) is a novel infectious disease caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) emerged in Wuhan and has quickly spread across the world. The mortality rate in critically ill patients with COVID-19 is high. This study analyzed clinical and biochemical parameters between mild and severe patients, helping to identify severe or critical patients early. METHODS: In this single center, cross-sectional study, 143 patients were included and divided to mild/moderate and sever/critical groups. Correlation between the disease criticality and clinical features and peripheral blood biochemical markers was analyzed. Cut-off values for critically ill patients were speculated through the ROC curve. RESULTS: Significantly, disease severity was associated with age (r = 0.458, P < 0.001), comorbidities (r = 0.445, P < 0.001), white cell count (r = 0.229, P = 0.006), neutrophil count (r = 0.238, P = 0.004), lymphocyte count (r = - 0.295, P < 0.001), albumin (r = - 0.603, P < 0.001), high-density lipoprotein cholesterol (r = - 0.362, P < 0.001), serum potassium (r = - 0.237, P = 0.004), plasma glucose (r = 0.383, P < 0.001), total bilirubin (r = 0.340, P < 0.001), serum amyloid A (r = 0.58, P < 0.001), procalcitonin (r = 0.345, P < 0.001), C-reactive protein (r = 0.477, P < 0.001), lactate dehydrogenase (r = 0.548, P < 0.001), aspartate aminotransferase (r = 0.342, P < 0.001), alanine aminotransferase (r = 0.264, P = 0.001), erythrocyte sedimentation rate (r = 0.284, P = 0.001) and D-dimer (r = 0.477, P < 0.001) . CONCLUSIONS: With the following parameters such as age > 52 years, C-reactive protein > 64.79 mg/L, lactate dehydrogenase > 245 U/L, D-dimer > 0.96 μg/mL, serum amyloid A > 100.02 mg/L, or albumin < 36 g/L, the progress of COVID-19 to critical stage should be closely observed and possibly prevented. Lymphocyte count, serum potassium, high-density lipoprotein cholesterol and procalcitonin may also be a prognostic indicator.