Background
Parkinson’s disease (PD) is a neurodegenerative disease second only to Alzheimer’s disease and is clinically characterized by a series of motor and non-motor symptoms. The latter often appear before motor symptoms, while cognitive impairment mostly occurs within a few years after the diagnosis of PD. We Aimed to predict the risk factors of cognitive impairment in PD patients based on transcranial sonography, clinical symptoms, and demographic characteristics. Independent-sample t-test was used for continuous data, and chi-square test was used for countable data. According to the occurrence time of cognitive impairment (CI), 172 PD patients were divided into non-CI (N-CI, n=48), CI at the first treatment (F-CI, n=58), and CI at the last treatment (L-CI, n=66). The age of onset, first treatment and smoking history of CI patients were significantly different from those with N-CI. When age of first treatment ≥61 years was considered the boundary value to diagnose CI, the sensitivity and specificity were 77.40% and 66.70%, respectively. At the first treatment, there was significant difference in depression between F-CI and N-CI. At the last treatment, the cumulative and new or aggravated hypomnesia of L-CI was significantly more than that of N-CI. There was significant difference in TCS grading between the first- and last treatment in L-CI. Depression, sexual dysfunction, and olfactory dysfunction were independent risk factors for CI during the last treatment, while memory impairment was an independent risk factor for CI during the entire treatment. The sensitivity and specificity of predicting CI in PD patients were 81.80% and 64.60%, respectively. The older the age of onset and treatment of PD patients, the more likely they were to have CI. Hypomnesia, depression, sexual dysfunction, and olfactory dysfunction can be used as independent risk factors to predict CI in PD patients.