P1361IS THE INFLAMMATORY STATE A DETERMINING FACTOR OF THE PRIMARY PERMEABILITY OF ARTERIOVENOUS FISTULES?

Background and Aims Clinical practice guidelines recommend an arteriovenous fistula (AVF) as the preferred vascular access for hemodialysis and are associated with a lower incidence of morbidity and mortality. However, primary vascular access (AV) failure is not uncommon. Low-grade inflammation is present in ERCT. We identify the inflammatory parameters that influence the primary permeability of vascular access for hemodialysis. Method Cross-sectional study; We include all the AVs performed in the HGUCR. We evaluate the initial operation after the creation of the AV. Demographic variables (age, sex), aetiology of CKD and associated comorbidity were collected. Statistical analysis with SPSS 25.0. Categorical variables are expressed as percentages and are compared using the Chi2 Test. Quantitative variables are expressed as mean ± standard deviation and the t-student was used to compare them. We performed a multivariate analysis to determine those factors involved in the primary failure of the VA. Statistical significance for a value of p <0.05. Results 600 VA performed on 466 patients were reviewed between October 2009 and December 2019. 492 autologous VA (86.8%) and 75 prosthetic VA (13.2%) were performed. The mean age of the patients was 65.3 ± 14.2 years and 66.2% were male. The most frequent etiology of CKD was diabetic nephropathy (29.9%), followed by non-affiliated (18%) and glomerulonephritis (16.5%). 90.8% of the patients had arterial hypertension (HT), diabetes mellitus (DM) 48%. 77.2% of AV presented primary permeability. In the univariate analysis using Chi2 and T student, statistical age (p = 0.017), HT (p = 0.002), statin treatment (p = 0.002), antiplatelet therapy (p = 0.001), low ferritin levels (p = 0.011) and PCR (p = 0.019). When performing a multivariate analysis, the high CRP figures (OR: 0.64 95% CI 0.42-0.98 p = 0.043) and ferritinemia (OR: 1.04 95% CI 1.01-1.06 p = 0.013) are predictive factors of primary AV failure. Conclusion In our study, high CRP decreases the probability of primary functioning of AVFs by 36% and elevated ferritin levels are predictors of primary failure after adjusting for age and sex in the multivariate model.