Mild cognitive impairment in patients with Parkinson's disease / 中华神经科杂志

ABSTRACT

Objective To investigate the cognitive impairment characteristics in Parkinson's disease (PD) with mild cognitive impairment(PD-MCI)as well as their related risk factors.Methods In all of the participants, a battery of neuropsychological tests were selected to identify the cognitive deficits; the 2 cognitive screening tests utilized in this study were the MMSE and the CAMCOG-C; the severity of disease was measured using the Hoehn-Yahr;the motor portion of the UPDRS and Webster scale were used to evaluate motor function and PD-MCI were classified according to modified Petersen's criteria.Results Of the 89 PD cases, 56 (63%) were cognitively normal (PDCOGNL), 20 (22%) had MCI and 13 (15%) met criteria for PD dementia (PDD). The cognitive domain abnormal in PD-MCI was orientation, language, memory, attention, praxis, thinking and perception. The PDCOGNL group had no significant differences in age and PD onset versus the PD-MCI group, but had significant difference in the years of education (PD-MCI4.4±4.3,PDCOGNL7.1±4.9;q=3.270, P<0.05); PD-MCI also had no significant differences for all of them versus the PDD, but the PDD group had significant differences for them (q=-4.913, -4.997, 4.740,all P<0.01) compared with the PDCOGNL group; there were no significant differences among 3 groups in years of PD duration. Hoehn-Yahr and Webster scale, UPDRS-motor score had negative correlation with PD cognitive function. Conclusions A stage of clinical cognitive impairment in PD can be defined between PDCOGNL and PDD that characterized as PD-MCI. There are multiple domains impaired in PD-MCI. The risk factors of PD cognitive impairment include the elder, later onset and lower education level. There are negative correlation between the severity of disease, motor function and PD cognitive function.