Correlation between elevated TNF-α, syndecan 1, and urine IL 18 levels in acute kidney injury following on pump cardiac surgery


Objective: This study aims to determine the correlation between elevated tumor necrosis factor alpha (TNF-α) and syndecan-1 with urine interleukin (IL)-18 levels as post-cardiac surgery-related acute kidney injury (AKI) marker.

Design: This study was an analytical observational study with a cross sectional design.

Setting: This study was conducted at Dr. Wahidin Sudirohusodo Central General Hospital. The period of study was from October 2019 to February 2020.

Patients and participants: Population of study was all patients who underwent adult on pump cardiac surgery. Study samples were patients who were included in inclusion criteria. Patient’s characteristics were presented as frequency and percentage.

Measurement and results: All interval data with normal distribution were analyzed using T-pair test. Spearman correlation test was performed to determine the correlation between TNF-α, syndecan-1, and IL-18 levels toward AKI incidence. The data was presented with odds ratio (OR) 95% confidence interval (CI). There were 33 subjects who underwent adult cardiac surgeries including coronary artery bypass grafting (CABG), valve, and congenital disorder surgeries. Twenty-one people (63.6%) had AKI and 12 people (36.4%) did not. In AKI patients there was an increased syndecan-1 level of 61.94±36.58 ng/ml with relative risk (RR)=1.11 (95% CI 1.02-1.21), TNF-α level of 6.85±4.05 pg/ml, RR=2.61 (95% CI 1.19-5.71), and IL-18 level of 205.5±121.35 pg/ml, RR=1.38 (95% CI 1.06-1.79). There was a significant correlation between syndecan-1, TNF-α, and IL-18 levels. AKI incidence in post-cardiac surgery patients had a significant elevated IL-18 level (p=0.016), with RR=1.38 (95% CI 1.06-1.79).Conclusion: Elevated syndecan-1, TNF-α, and IL-18 levels were correlated with AKI incidence in post-cardiac surgery patients.