MO179ACUTE KIDNEY INJURY IN ELDERLY- PROGNOSTIC VALUES OF COMORBIDITY AND THE AGE FOR THE SHORT AND THE LONG TERM OUTCOME
Authors: Petronijevikj Zvezdana , Selim Gjulsen , Gerasimovska Biljana , Trajceska Lada 
Published: May 2021

Abstract

Background and Aims
Acute kidney injury (AKI) is defined by a rapid decline in glomerular filtration rate (GFR), resulting in disturbance of renal physiological functions including impairment of nitrogenous waste product excretion, loss of water and electrolyte regulation and loss of acid-base regulation. Coexisting disease and the structural and functional changes that occur during the aging process are disposing factors that increase the risk of AKI in elderly population.

Method
101 elderly patients (≥ 65) who filling out one of the criteria of definition of AKI according to Kidney Disease Improving Global Outcome (KDIGO), were included in the study. Patients were divided into 2 groups by age, group &lt;75 and group&gt; 75 years old. In terms of outcome they were divided in group with short and 90-day survival. The burden of the simultaneous presence of comorbid conditions was estimated through the Charles Comorbid Index. (CHI)

Results
The mortality rate for the 90-day follow-up period after the AKI event was 45.5%. The intra-hospital mortality rate in adult patients with AKI was 22.8%.In our study the age was not confirmed as a risk factor for intra-hospital and 3-month outcome in elderly patients with AKI. The presence of comorbid conditions estimated through the Charles Comorbid Index (CHI), differed un-significantly between survivors and deceased patients with AKI (p = 0.39, p = 0.28 consecutive). Cox regression analysis confirmed the CCI score as a significant factor in survival in patients with ABO. (p = 0.036).The risk of letal outcome increases by 16.3% with each increase in this unit score. Cox regression analysis confirmed heart diseases as a significant prognostic factor for survival, increasing the risk of fatal outcome by about 2 times higher than patients without heart disease. Statistical analysis showed a significant difference in survival time, depending on the presence of heart disease as a comorbidity (p =0.037). Conducted Cox regression analysis showed that HR - for heart disease, as a comorbidity, is 1.837 95% CI (1.020 - 3.306) and p = 0.043. The death rate for patients with heart disease is about 2 times higher than patients without heart disease. Cumulative survival was higher in the group of patients without cardiomyopathy - 64.2% (0.07) compared to the group of patients with cardiomyopathy- 43.8% (0.07). Multivariate Cox regression analysis as significant independent predictors of survival in patients with ABO confirmed the diuresis (p = 0.029) and albumin (p = 0.006).

Conclusion
AKI survivors with high burden of comorbidities are at high risk for postdischarge death. Cardiomyopathy, as a risk factor, for two times increases the risk of death. CCI score is significant independent high-risk prognostic factors for poor outcome in elderly patients with AKI. Remain the recommendation for individual clinical approach, assessment and selection for the application of treatment taking into account the overall condition in adult patients with acute renal injury.