Systemic Inflammation and Clinical Outcomes in COVID-19: a retrospective study
Abstract Background:COVID-19 causes epidemics and pandemics worldwide, but the role of pathophysiological parameters particularly systemic inflammation in COVID-19 has not been understood. We aimed to investigate clinical outcomes in view of systemic inflammation in COVID-19.Methods:In this retrospective study, the demographic and clinical data of 225 confirmed COVID-19 cases on admission at Tongji Hospital from January 28 to February 15, 2020, were extracted and analyzed. These patients were categorized by inflammation state on the basis of the expression of inflammatory factors or classified as severe and non-severe according to 2019 American Thoracic Society / Infectious Disease Society of America guidelines.Results: Among 225 patients with confirmed COVID-19, 155 patients (68.9%) categorized into hyperinflammation group and 70 (31.1%) were non- hyperinflammation group. Compared to non-hyperinflammation group, hyperinflammation group more frequently had chest tightness/dyspnea and lymphopenia, aberrant multiple indexes of organ function including the heart, liver, kidney, and coagulation, with higher level of C-reactive protein (hsCRP) as well as interleukin (IL)-6, IL-8, tumour necrosis factor α (TNF-α), etc. Hyperinflammation group were more likely to admit to intensive care unit (ICU) (52.3% vs 5.7%), receive ventilation (84.5% vs 10.0%) and be with higher mortality (44.5% vs 5.7%) than non-hyperinflammation group. The mortality of severe patients with hyperinflammation (60/99, 60.6%) was significantly higher than without hyperinflammation (2/20, 10.0%). Non-severe patients with hyperinflammation even tended to have higher mortality (9/56, 16.1%) than those in severe cases without hyperinflammation (2/20, 10%).Conclusion: Excessive systemic inflammation was correlated highly with poor clinical outcomes in COVID-19, particularly in severe cases. Non-severe patients with hyperinflammation even tended to have higher mortality than those in severe cases without hyperinflammation.Trial registration: This is a retrospective observational study without a trial registration number.