Prognostic Significance of Lactate Dehydrogenase-to-Albumin Ratio and Neutrophil Percentage-to-Albumin Ratio in IgA Nephropathy

<b>Background:</b> Inflammation plays a key role in the development of immunoglobulin A nephropathy (IgAN). The lactate dehydrogenase-to-albumin ratio (LAR) and neutrophil percentage-to-albumin ratio (NPAR) have emerged as markers reflecting inflammation and nutritional status. This study evaluated the prognostic significance of LAR and NPAR for predicting renal and cardiovascular (CV) outcomes in patients with IgAN. <b>Methods:</b> This study included 121 patients with biopsy-proven IgAN. The mean age was 43.6 ± 12.9 years, and 66% were male. Average follow-up time was 98.7 ± 63.3 months. The primary composite endpoints were total mortality, major CV events, and end-stage renal disease. Secondary endpoints, cardiovascular, or renal endpoints were also examined separately. Cox proportional hazards analyses were performed to evaluate these markers in predicting renal and CV prognosis. <b>Results:</b> Patients were divided into high and low groups for both LAR and NPAR based on ROC curve analysis. High LAR was linked to poorer outcomes for the primary composite endpoint (<i>p</i> = 0.03) and for separate renal (<i>p</i> = 0.018) and cardiovascular (<i>p</i> = 0.009) endpoints. Similarly, high NPAR was associated with worse primary (<i>p</i> = 0.02), renal (<i>p</i> = 0.039), and CV (<i>p</i> = 0.042) outcomes. In multivariate Cox regression analysis, high LAR remained an independent risk factor for the primary composite endpoint (HR = 4.165, 95% CI = 1.45-11.959, and <i>p</i> = 0.008) but not for renal or CV endpoints individually. <b>Conclusions:</b> High LAR and NPAR, as markers of inflammation and altered nutritional status, are associated with poorer renal and cardiovascular outcomes in IgAN and may serve as useful prognostic indicators.