[The influencing factors of cognitive impairment in patients with silicosis]

Objective: To explore the influencing factors of cognitive impairment in patients with silicosis, and to analyze the effect of brain-derived neurotrophic factor (BDNF) on cognitive function. Methods: In March 2021, 484 silicosis patients from April 2018 to April 2020 were included in the study. The Montreal Cognitive Assessment Scale of Chinese version was used to evaluate their cognitive function, and they were divided into the cognitive impairment group (n=282) and the non cognitive impairment group (n=202) , another 30 healthy persons from body check were served as control group. The concentrations of BDNF were compared between the three groups. And the receiver operating characteristic (ROC) curve was drawed to analyze the value of BDNF in predicting cognitive impairment in silicosis patients. And the logistic regression analysis was used to explore the risk factors of cognitive impairment. Results: The incidence of cognitive impairment in silicosis patients was 58.26% (282/484) . The level of BDNF in the cognitive impairment group[ (10.32±2.11) mg/L] was significantly lower than that in the non cognitive impairment group[ (13.43±3.45) mg/L] (t=-12.27, P<0.001) . The results of ROC curve analysis showed that the area unde the curve of BDNF in predicting cognitive impairment of silicosis patients was 0.763 (95%CI: 0.613-0.874, P=0.024) , the cut off value was 10 mg/L, the sensitivity was 0.88, and the specificity was 0.84. Logistic regression analysis showed that the level of BDNF (≤10 mg/L) , age (≥65 years old) , course of disease (≥5 years) and diabetes mellitus were the risk factors of cognitive impairment in silicosis patients (OR=2.346, 95%CI: 1.654-3.103; OR=1.757, 95%CI: 1.214-1.998; OR=1.346, 95%CI: 1.112-1.564; OR=1.165, 95%CI: 1.102-1.542, P=0.001, 0.012, 0.027, 0.036) . Conclusion: BDNF may be one of the indicator to predict the risk of cognitive impairment in patients with silicosis.