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Decreased CO(2) Levels as Indicators of Possible Mechanical Ventilation-Induced Hyperventilation in COVID-19 Patients: A Retrospective Analysis #MMPMID33585382
Hu D; Li J; Gao R; Wang S; Li Q; Chen S; Huang J; Huang Y; Li M; Long W; Liu Z; Guo L; Wu X
Front Public Health 2020[]; 8 (ä): 596168 PMID33585382show ga
Background: Six months since the outbreak of coronavirus disease (COVID-19), the pandemic continues to grow worldwide, although the outbreak in Wuhan, the worst-hit area, has been controlled. Thus, based on the clinical experience in Wuhan, we hypothesized that there is a relationship between the patient's CO(2) levels and prognosis. Methods: COVID-19 patients' information was retrospectively collected from medical records at the Leishenshan Hospital, Wuhan. Logistic and Cox regression analyses were conducted to determine the correlation between decreased CO(2) levels and disease severity or mortality risk. The Kaplan-Meier curve analysis was coupled with the log-rank test to understand COVID-19 progression in patients with decreased CO(2) levels. Curve fitting was used to confirm the correlation between computed tomography scores and CO(2) levels. Results: Cox regression analysis showed that the mortality risk of COVID-19 patients correlated with decreased CO(2) levels. The adjusted hazard ratios for decreased CO(2) levels in COVID-19 patients were 8.710 [95% confidence interval (CI): 2.773-27.365, P < 0.001], and 4.754 (95% CI: 1.380-16.370, P = 0.013). The adjusted odds ratio was 0.950 (95% CI: 0.431-2.094, P = 0.900). The Kaplan-Meier survival curves demonstrated that patients with decreased CO(2) levels had a higher risk of mortality. Conclusions: Decreased CO(2) levels increased the mortality risk of COVID-19 patients, which might be caused by hyperventilation during mechanical ventilation. This finding provides important insights for clinical treatment recommendations.