Abstract
Rapid eye movement (REM) sleep behavior disorder (RBD) is a parasomnia characterized by repeated episodes of dream enactment behavior and REM sleep without atonia (RSWA) during polysomnography recording. RSWA is characterized by increased phasic or tonic muscle activity seen on polysomnographic electromyogram channels. RSWA is a requisite diagnostic feature of RBD, but may also be seen in patients without clinical symptoms or signs of dream enactment as an incidental finding in neurologically normal individuals, especially in patients receiving antidepressant therapy. RBD may be idiopathic or symptomatic. Patients with idiopathic RBD often later develop other neurological features including parkinsonism, orthostatic hypotension, anosmia, or cognitive impairment. RSWA without clinical symptoms as well as clinically overt RBD also often occurs concomitantly with the α-synucleinopathy family of neurodegenerative disorders, which includes idiopathic Parkinson disease, Lewy body dementia, and multiple system atrophy. This review article considers the epidemiology of RBD, clinical and polysomnographic diagnostic standards for both RBD and RSWA, previously reported associations of RSWA and RBD with neurodegenerative disorders and other potential causes, the pathophysiology of which brain structures and networks mediate dysregulation of REM sleep muscle atonia, and considerations for the effective and safe management of RBD.
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Acknowledgments
This publication was made possible by the following grants: 1 UL1 RR024150 from the National Center for Research Resources (NCRR), a component of the National Institutes of Health (NIH), and the NIH Roadmap for Medical Research; P50 AG016574, UO1 AG006786, RO1 AG015866, the Mangurian Foundation, and the Robert H. and Clarice Smith and Abigail Van Buren Alzheimer’s Disease Research Program of the Mayo Foundation. Its contents are solely the responsibility of the author and do not necessarily represent the official view of NCRR or NIH. Information on NCRR is available at http://www.ncrr.nih.gov/. Information on Reengineering the Clinical Research Enterprise can be obtained from http://nihroadmap.nih.gov.
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Conflicts of interest: S.J. McCarter: none; E.K. St. Louis: has received grant support from NCRR/NIH and Mayo CTSA; and has received consultant’s fees for service on clinical trial adverse events committee for an investigational treatment for obstructive sleep apnea from Inspire, Inc.; B.F. Boeve: has received grant support from NIH, Cephalon, Inc., Allon Pharmaceuticals, Mangurian Foundation, Alzheimer’s Association, and GE Healthcare; he is the Co-editor of “Behavioral Neurology of Dementia” text; and he has received payment for development of educational presentations from the American Academy of Neurology.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s11910-012-0261-z.
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McCarter, S.J., St. Louis, E.K. & Boeve, B.F. REM Sleep Behavior Disorder and REM Sleep Without Atonia as an Early Manifestation of Degenerative Neurological Disease. Curr Neurol Neurosci Rep 12, 182–192 (2012). https://doi.org/10.1007/s11910-012-0253-z
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DOI: https://doi.org/10.1007/s11910-012-0253-z