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• W4309455864 abstract "Background: The uncompetitive NMDA antagonist, memantine (MEM), enhances prepulse inhibition of startle (PPI) across species. MEM is used to treat Alzheimer’s disease (AD); conceivably, its acute impact on PPI might be used to predict a patient’s sensitivity to MEM’s therapeutic effects. Objective: To begin to test this possibility, we studied MEM effects on PPI and related measures in AD patients. Methods: 18 carefully screened individuals with AD (mean age = 72.8 y; M:F=9 : 9) completed double-blind order-balanced testing with MEM (placebo versus 20 mg), assessing acoustic startle magnitude, habituation, PPI, and latency. Results: Fifteen out of 18 participants exhibited reliable startle responses. MEM did not significantly impact startle magnitude or habituation. Compared to placebo responses, PPI was significantly increased after MEM (p < 0.04; d = 0.40); this comparison reached a large effect size for the 60 ms interval (d = 0.62), where maximal MEM effects on PPI were previously detected. Prepulses reduced peak startle latency (“latency facilitation”) and this effect was amplified after MEM (p = 0.03; d = 0.41; for 60 ms intervals, d = 0.69). No effects of MEM were detected on cognition, nor were MEM effects on startle associated with cognitive or clinical measures. Conclusion: MEM enhances prepulse effects on startle magnitude and latency in AD; these changes in PPI and latency facilitation with MEM suggest that these measures can be used to detect an AD patient’s neural sensitivity to acute MEM challenge. Studies in progress will determine whether such a “biomarker” measured at the outset on treatment can predict sensitivity to MEM’s therapeutic effects." @default.
• W4309455864 created "2022-11-28" @default.
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• W4309455864 date "2023-01-03" @default.
• W4309455864 modified "2023-10-16" @default.
• W4309455864 title "Preliminary Evidence that Memantine Enhances Prepulse Effects on Startle Magnitude and Latency in Patients with Alzheimer’s Disease" @default.
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• W4309455864 doi "https://doi.org/10.3233/jad-220769" @default.
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