Introduction
This study aims to explore the relationship between arterial partial pressure of oxygen (PaO2) and in-hospital mortality in patients admitted for the first time with intracerebral hemorrhage, with emphasis on the effect of hyperoxia on mortality.
Methods
We screened the MIMIC IV database for 1985 patients with cerebral hemorrhage admitted for the first time between 2008 and 2019. Exclusions included cases with duplicate records, patients with tumors, aneurysms, traumatic cerebral hemorrhage, cerebral hemorrhage due to blood disorders, and cases missing PaO2 values — 828 patients for final analysis. Based on PaO2 levels within 24 hours of admission, patients were divided into three groups: high (> 150 mmHg), medium (100–150 mmHg), and low (< 100 mmHg). A logistic mixed-effects regression model was used to analyze the relationship between PaO2 and hospital mortality.
Results
The overall mortality rate during hospitalization was 37.1%. After adjusting for confounding factors, the mortality risk ratio (OR) of the low PaO2 group and high PaO2 group were 1.78 (95%CI: 1.04–3.03, P = 0.034) and 2.09 (95%CI: 1.28–3.42, P = 0.003), respectively. However, no significant associations were found between PaO2levels and 28-, 60-, or 90-day mortality. Subgroup analysis showed an interaction between in-hospital mortality and PaO2 level in patients with chronic lung disease (P = 0.002). Sensitivity analysis showed that the relationship still existed after excluding extreme PaO2 values.
Conclusions
Elevated arterial oxygen tension within the first 24 hours of admission was independently associated with increased in-hospital mortality in patients with intracerebral hemorrhage.
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