Longitudinal study of cognitive function in idiopathic REM sleep behavior disorder
Maria Livia Fantini1, Elena Farini, Paola Ortelli
1Sleep Disorders Center, Università Vita-Salute San Raffaele, Milan, Italy. fantini.marialivia@hsr.it
Sleep
|May 3, 2011
Summary
Idiopathic REM sleep behavior disorder (iRBD) patients show cognitive decline in memory and visuo-constructional abilities over two years. This suggests an underlying neurodegenerative process, even without dementia development.
Area of Science:
- Neurology
- Sleep Medicine
- Cognitive Neuroscience
Background:
- Idiopathic REM sleep behavior disorder (iRBD) is a neurodegenerative condition.
- Cognitive decline is a known complication of iRBD.
- Longitudinal studies are crucial for understanding disease progression.
Purpose of the Study:
- To evaluate the longitudinal changes in cognitive functions among patients with iRBD.
- To compare cognitive trajectories in iRBD patients versus healthy controls.
- To identify specific cognitive domains affected over time in iRBD.
Main Methods:
- Prospective study design with baseline and 2-year follow-up.
- Inclusion of 24 cognitively asymptomatic iRBD patients and 12 matched healthy controls.
- Utilized video-polysomnography, comprehensive neuropsychological testing, and neurological examinations.
Main Results:
- iRBD patients exhibited deficits in delayed verbal memory and visuo-constructional abilities at baseline.
- At follow-up, iRBD patients showed significant worsening in visuo-spatial learning compared to controls.
- Executive functions, attention, and language remained largely unaffected in the iRBD cohort.
Conclusions:
- Cognitive deterioration in memory and visuo-constructional domains indicates an evolving neurodegenerative process in iRBD.
- While dementia was not observed, the findings highlight the progressive nature of cognitive impairment in iRBD.
- Early identification of cognitive changes may aid in managing iRBD progression.
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