Abstract:

[Abstract] Objective  To explore clinical characteristics and prognostic risk factors in patients with community ac? quired pneumonia（CAP）complicated with acute kidney injury（AKI）．Methods  In total, 456 CAP patients were included based on the diagnostic guide．According to whether the patients were accompanied with AKI，the patients were divided in? to two groups（non-AKI group and AKI group）．AKI group were further divided into risk group, injury group and failure group by RIFLE criteria using admission creatinine．Severity in CAP patients，clinical indexes and prognostic evaluation in? dexes were compared between different groups． Multiple factors were analyzed using Logistic regression model，survival RIFLE criteria in prognostic evaluation．Results  Thirty percent（135）of the total 456 CAP patients were accompanied with AKI．Patients in AKI group were further divided into risked group (45.2%, 61 patients), injury group (17%, 23 pa? tients) and failure group (37.8%, 51 patients) according to the RIFLE diagnostic criteria using basal creatinine level. Among the 300 patients with PSI gradeⅠ to Ⅲ，23.3%（70）of patients developed AKI while among 156 patients who are with PSI grade Ⅳor over, 65 patients (41.7%) developed AKI（P < 0.01）．The 30-day mortality of CAP patients accompanied with AKI were increased compared to Non-AKI group（Non-AKI：6.2%；Risk：14.8%；Injury：21.7%；Failure：45.1%）．With de? teriorating in RIFLE criteria，the portion of patients who required mechanical ventilation, inotropic support（MV/IS）and re? nal replacement therapy（RRT）increased too. Logistic analysis revealed that AKI，age of 75 years or older and extra-renal or? gan failure were the risk factors of poor prognosis in patients with CAP. The rate of survivors was decreased in the CAP pa? tients accompanied with AKI compared with those who did not．Conclusion  There is certain incidence of AKI to compli? cate CAP patients who will have a poor prognosis．RIFLE diagnostic criteria is a valuable tool to evaluate prognosis of CAP patients complicated with AKI．

Key words: community acquired pneumonia, acute kidney injury (AKI), prognosis, RIFLE class