Neutrophil-to-lymphocyte ratio can predict the clinical prognosis of patients with primary adosteronism

Abstract Background Excess aldosterone-mediated inflammatory response is thought to be a factor in the high risk of cardiovascular events in patients with primary aldosteronism (PA). Leucocyte related inflammatory parameters, especially NLR, were significantly independent of aldosterone (PAC) in PA patients. However, the impact of NLR on the long-term prognosis of PA patients is unclear. Objective To explore the predictive value of neutrophil-to-lymphocyte ratio (NLR) on the long-term prognosis of patients with primary aldosteronism (PA). Methods The data for this study were derived from the Tianjin Health and Medical Big Data Super platform, comprising a retrospective cohort of patients discharged from 72 hospitals in our city from 2010 to 2023. According to the inclusion and exclusion criteria, 570 patients were ultimately included in the statistical analysis. Each patient had laboratory measurements, including blood cell counts, taken after admission and before interventional treatment. The primary endpoint was major cardiovascular events (MACEs), defined as cardiovascular death, nonfatal myocardial infarction (MI), and nonfatal stroke. Results During a mean follow-up period of 5 years, 125（21.9%）MACEs were recorded. ROC curve analysis displayed that the best cut-off value of NLR for predicting MACEs was 4.87. The MACEs of the high NLR group at 1 year, 3 years, and 5 years were higher than those of the low NLR group（25.0% vs 9.4%，40.3% vs17.1% 和 40.3% vs 19.3%；P＜0.05).Kaplan-Meier survival curve analysis showed that the survival rate of the low NLR group was higher than that of the high NLR group (P<0.001). The results of multivariate Cox proportional hazards regression analysis showed that NLR was an independent risk factor affecting the prognosis of PA patients, and the difference was statistically significant (P<0.05). Conclusions Elevated NLR is associated with adverse prognosis in patients with PA. NLR can serve as a simple and practical indicator to evaluate the long-term prognosis of PA patients. These findings warrant external validation, preferably in a prospective design.