Factors affecting change in renal function after contrast-enhanced computed tomography in cancer patients

Objectives. Contrast-enhanced computed tomography (CECT) is the most common form of assessing the effectiveness of cancer patient treatment. However, an injection of an iodine-based contrast agent can cause acute kidney damage (AKI). To determine the frequency and factors affecting post-contrast kidney function deterioration during oncologi-cal treatment. Material and methods. Kidney function in cancer patients with solid tumors undergoing a total of 206 CECTs was retrospectively analyzed. Results. Two hundred and six CECT procedures in 79 patients (age 68.4 +/- 10.6 years) were included in the study. The median eGFR before CECT according to the MDRD was 81 mL/min/1.73 m2 (IQR 26). The median time between CECT and kidney function examination was 8 (IQR 8) days. In the whole group, the median eGFR change defined as the differ- ence between eGFR after and before CECT was 0.0 (9.0) mL/min/1.73 m2 and was not significant. eGFR decreased in 100/206 (48.5%) CECT procedures with the median difference = -5.0 (6.0) mL/min/1.73 m2. However, clinically significant deterioration of renal function (an increase in SCr of > 0.3 mg/dL) was found only in two cases (0.9%). The change in eGFR associated with CECT correlated significantly (p < 0.05) with initial creatinine (r = 0.117) and urea (r = 0.158), but not with age and comorbidities. After dividing the analyzed population according to the median GFR, it turned out that in the group of patients with eGFR < 81 mL/min/1.73 m2, the median difference in GFR level was 1 (IQR 10), and in the group with a higher eGFR level the median was -1 (IQR 8.5), which was statistically significant (p = 0.03). The mul- tivariate logistic regression analysis in subsequent reduced models confirmed that SCr, uric acid level, and the use of antimetabolites were the factors independently reducing the risk of deterioration of renal function after CECT. Conclusions. CECT can be responsible for kidney function deterioration; however, it has no impact on oncologi-cal treatment.