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| Impairment of working memory in patients with depressive disorder |
| YU Ge*, LOU Le, XU Fangzhong
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| *Department of Clinical Psychology, Tongde Hospital of Zhejiang Province, Hangzhou, Zhejiang 310012, China |
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Abstract Objective To analyze the working memory impairment in patients with different degrees of depressive disorder and its influencing factors, so as to provide the basis for the clinical evaluation of cognitive function in patients with depressive disorder. Methods From January 2019 to November 2020, the patients with depressive disorder were selected in the psychiatry and clinical psychology departments of a tertiary hospital. Demographic information, disease course and medication were collected. Depression subscale ( DEP ) of Mental Health Inventory ( PHI ) was used to measure the degree of depressive disorder. N-back tasks were used to test working memory, with error rate and reaction time as experimental variables to compare the working memory impairment of patients with different degrees of depressive disorder. The multivariate linear regression model was used to analyze the influencing factors for working memory impairment in patients with depressive disorder. Results A total of 75 patients with depressive disorder were included, including 45 mild cases and 30 moderate and severe cases. The error rates of mild cases and moderate and severe cases in the 3-back task were ( 27.47±20.59 )% and ( 39.60±25.95 )%, the response time between the two groups in 0-back, 1-back, 2-back and 3-back task were ( 458.29±104.19 ) ms and ( 527.90±99.58 )ms,( 499.87±85.46 ) ms and ( 574.57±126.25 ) ms, ( 567.44±114.86 ) ms and ( 675.37±137.54 ) ms, ( 663.76±167.99 ) ms and ( 753.27±152.06 ) ms, the differences between two groups were significant ( P<0.05 ). The multivariate linear regression analysis showed that the severity of depressive disorder was correlated with the response time of 0-back to 3-back tasks and the error rate of 3-back task; whether patients took medicine or not was depressive disorder correlated with the 0-back task response time ( all P<0.05 ). Conclusion There are differences in working memory impairment among patients with different degrees of depressive disorder and the severity of impairment is correlated with the severity of depressive disorder and the use of antidepressant drugs.
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Received: 27 January 2021
Revised: 21 May 2021
Published: 09 July 2021
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