The Correlation Between the Types of Initial Bacterial Infection and Clinical Prognosis in Patients With Septic AKI.

BACKGROUND

Acute kidney injury (AKI) is a common complication of sepsis and is an independent risk factor for mortality. It is unclear whether different bacteria play different roles in the occurrence and development of sepsis-associated AKI (S-AKI). We observed the clinical characteristics and outcomes of patients that have types of bacterial infection, and different infections sites before the occurrence of AKI, respectively.

METHODS

Data of patients who were diagnosed with sepsis and later developed AKI from 2008 to 2019 were retrieved from the MIMIC-IV 1.0 database. Patients were first divided into the two groups according to the bacterial culture results obtained prior to AKI occurrence: bacterial cultured positive ( = 1,785) and bacterial cultured negative ( = 8,777). Patients with bacteria culture positive were divided into culture bacteria Gram-positive (CGP, = 1248) and Gram-negative (CGN, = 537) groups.

RESULTS

Overall, 1,785 patients were included in the present analysis. The patients in CGN group were older (70 vs. 66, < 0.001), had lower body mass index (BMI) (27.0 vs. 28.4, < 0.001), higher acute physiology III (APS III) score (63.0 vs. 58, = 0.001), shorter time from positive microbial culture to diagnosis of AKI (2.94 vs. 3.16 days, = 0.013) and longer intensive care unit (ICU) stay time (5.94 vs. 4.77 days, < 0.001) compared with those in the CGP group ( = 1,248). In the culture gram-negative bacteria in patients with positive blood cultures (CGNb) group, the rate of vasopressors using (73.1 vs. 56.4%, = 0.007), the Sequential Organ Failure Assessment (SOFA) score (10 vs. 9, = 0.005), and the level of lactate (3.7 vs. 2.5, = 0.001) were higher than those in the culture gram-positive bacteria in patients with positive blood cultures (CGPb) group. The time from positive microbial culture to the diagnosis of AKI was shorter (2.23 vs. 3 days, = 0.001) in the CGNb group. However, there was no significant difference in the continuous renal replacement treatment (CRRT) application or short-term mortality rates between CGN and CGP groups.

CONCLUSION

The Gram types of bacteria cultured prior to S-AKI occurrence was not related to AKI stage, CRRT application, and short-term mortality. Compared with the Gram-positive bacterial infections, Gram-negative bacterial infections take a shorter time to develop into AKI, and had a higher disease severity score.