Abstract 1122‐000025: Gender in Dementia Patients with Lewy Body Dementia and Parkinson’s Disease with Dementia

Introduction : Gender differences in dementia patients have been investigated extensively, however, demographic, risk, and pharmacological factors associated with gender differences in dementia patients associated with Lewy Body Dementia(LBD) and Parkinson’s disease with dementia (PDD) are not fully understood. We tested the hypothesis that specific factors may contribute to the observed gender differences in LBD and PDD patients. Methods : A 5‐year retrospective data analytical study was conducted using 4526 men and 3676 women collected from a regional hospital database. We performed logistic regression analysis to determine factors associated with gender differences in LBD and PDD patients. Multicollinearity and significant interactions between independent variables in the model were examined using variance inflation factors, while a Cox & Snell classification was applied to check the model fitness. Results : In the adjusted analysis, African‐American men (AAM) (OR = 0.249, 95% CI, 0.088‐0.703, P = 0.009) were more likely to present with PDD, while women with increasing age (OR = 1.042, 95% CI, 1.025‐1.058, P<0.002) were more likely to present with LBD. Escitalopram was associated with LBD in men (OR = 1.444, 95% CI, 1.079‐1.932, P = 0.014) and PDD in women (OR = 0.651, 95% CI, 0.468‐0.906, P = 0.011). Conclusions : Our findings revealed gender differences in LBD and PDD. More men presented with. PDD based on race, while women presented with LBD more based on age.

Exploring Bottom-Up Visual Processing and Visual Hallucinations in Parkinson's Disease With Dementia

Visual hallucinations (VH) are a common symptom of Parkinson's disease with dementia (PDD), affecting up to 65% of cases. Integrative models of their etiology posit that a decline in executive control of the visuo-perceptual system is a primary mechanism of VH generation. The role of bottom-up processing in the manifestation of VH in this condition is still not clear although visual evoked potential (VEP) differences have been associated with VH at an earlier stage of PD. Here we compared the amplitude and latency pattern reversal VEPs in healthy controls (n = 21) and PDD patients (n = 34) with a range of VH severities. PDD patients showed increased N2 latency relative to controls, but no significant differences in VEP measures were found for patients reporting complex VH (CVH) (n = 17) compared to those without VH. Our VEP findings support previous reports of declining visual system physiology in PDD and some evidence of visual system differences between patients with and without VH. However, we did not replicate previous findings of a major relationships between the integrity of the visual pathway and VH.

Exploring Bottom-Up Visual Processing and Visual Hallucinations in Parkinson’s Disease with Dementia

Visual hallucinations (VH) are a common symptom of Parkinson’s disease with dementia (PDD), affecting up to 65% of cases. Integrative models of their etiology posit that a decline in executive control of the visuo-perceptual system is a primary mechanism of VH generation. The role of bottom-up processing in the manifestation of VH in this condition is still not clear. Here we compared amplitude and latency patterns of reversal visual evoked potentials (VEPs) in healthy controls (n=21) and PDD patients (n = 34) with a range of VH severities. PDD patients showed increased N2 latency relative to controls, but patients reporting complex VH (n=17) did not demonstrate any relationship between VEP measurements and their hallucination severity as measured on the neuropsychiatric inventory hallucinations subscale (NPIHal) score. Our VEP findings support previous reports of declining visual system physiology in PDD. However, no notable major relationships between the integrity of the visual pathway and VH were found.