Preprocedural Lp(a) level and ApoB/ApoA-Ι ratio and the risk for contrast-induced acute kidney injury in patients undergoing emergency PCI

Background High serum Lipoprotein(a) (Lp(a)) level and Apolipoprotein B/Apolipoprotein A Iota (ApoB/ApoA-Iota) ratio are risk factors for cardiovascular disease and kidney disease and have been found to be correlated with the prevalence and prognosis of various kidney diseases. However, it is not clear whether the serum Lp(a) level and ApoB/ApoA-Iota ratio pre-PCI are correlated with the prevalence of contrast-induced acute kidney injury (CI-AKI). Methods A total of 931 participants undergoing emergency PCI from July 2018 to July 2020 were included. According to whether the serum creatinine concentration was higher than the baseline concentration (by >= 25% or >= 0.5 mg/dL) 48-72 h after contrast exposure, these participants were divided into a CI-AKI group (n = 174) and a non-CI-AKI group (n = 757). Serum Lp(a), ApoA-Iota and ApoB concentration were detected in the patients when they were admitted to hospital, and the ApoB/ApoA-Iota ratio was calculated. Logistic regression and restricted cubic spline analyses were used to explore the correlation between the Lp(a) concentration or the ApoB/ApoA-Iota ratio and the risk of CI-AKI. Results Among the 931 participants undergoing emergency PCI, 174 (18.69%) participants developed CI-AKI. Compared with the non-CI-AKI group, the Lp(a) level and ApoB/ApoA-Iota ratio pre-PCI in the CI-AKI group were significantly higher (P < 0.05). The incidence of CI-AKI was positively associated with the serum Lp(a) level and ApoB/ApoA-Iota ratio pre-PCI in each logistic regression model (P < 0.05). After adjusting for all the risk factors included in this study, restricted cubic spline analyses found that the Lp(a) level and the ApoB/ApoA-Iota ratio before PCI, within certain ranges, were positively associated with the prevalence of CI-AKI. Conclusion High Lp(a) levels and high ApoB/ApoA-Iota ratios before PCI are potential risk factors for CI-AKI.