Cognitive Assessment in PD and DT Patients

We compared the MoCA scores, MMSE scores, and intraoperative memory test scores to evaluate cognitive behavior of the PD and the DT patients. We also compared the intraoperative memory test scores between the PD and DT patients in subgroups based on cognitive impairment defined by the MoCA scale^{6 (link),27 (link),28 (link)}, including a subgroup with high MoCA scores (26–30, indicating normal cognition), a subgroup with medium MoCA scores (18–25, indicating mild cognitive impairment), and a subgroup with low MoCA scores (11–17, indicating mild dementia). This grouping criterion is in line with the cognitive impairment levels defined by the MoCA scale^{29 (link)}, which is believed to be superior to the MMSE in detecting cognitive changes^{30 (link)–32 (link)}. Correlation analyses were performed to evaluate the relationships between the intraoperative memory test scores and the preoperative cognitive assessment scores. Descriptive statistics are reported as the means and standard deviations. Student’s t test was used to compare variables between the PD and DT patients. Statistical analyses were performed using MATLAB 2018b (Mathworks, USA). The significance level was set at an alpha of P < 0.05.