NREM sleep transient events in fronto-temporal dementia: beyond sleep stage architecture

Michelangelo Maestri, Luca Carnicelli, Nicholas-Tiberio Economou, Anastasios Bonakis, Thomas Paparrigopoulos, Sokratis T Papageorgiou, Filippo Giorgi, Elisa Di Coscio, Gloria Tognoni, Raffaele Ferri, Ubaldo Bonuccelli, Enrica Bonanni

Abstract


Frontotemporal dementia (FTD) is increasingly becoming recognized as a major cause of early onset (<65 years) neurodegenerative dementia. Although sleep disorders significantly impair patients' and caregivers' quality of life in neurodegenerative diseases, polysomnographic data in FTD patients are scarce in the literature. Aim of our study was to investigate sleep microstructure in FTD, by means of Cyclic Alternating Pattern (CAP), in a groups of ten behavioral variant FTD patients (6 M, 4 F; mean age 61.2 ± 7.3 years; disease duration: 1.4±0.7 years) and to compare them with cognitively intact healthy elderly. Sleep in FTD patients was altered at different levels, involving not only the conventional sleep stage architecture parameters (total sleep time, single stage percentage, NREM/REM cycle organization), but also microstructure. FTD subjects showed CAP disruption with decreased slow wave activity related phases (A1 index, n/h:14.5±6.8 vs 38.8±6.6, p<.001) and increased arousal-related fast CAP components (A2 index 22.9±8.2 vs 11.6±3.7, p=.006; A3 index 41.9±20.7 vs 13.0±6.5, p=.002). Several correlations between sleep variables and neuropsychological tests were found. Sleep impairment in FTD may be specifically related to the specific frontal lobe involvement in the neurodegenerative process. The pattern of alterations seems somewhat peculiar, probably due to the anatomical distribution of the neurodegenerative process with a major impact on frontal lobe generated sleep transients, and a substantial sparing of phenomena related to the posterior cortex.


Keywords


frontotemporal dementia; polysomnography; cyclic alternating pattern; sleep instability; neurodegeneration

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DOI: https://doi.org/10.4449/aib.v153i2-3.4045

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