Rapid eye movement sleep behavior disorder: modern concept and Parkinson’s disease correlation
- Authors: Khasanova D.M.1, Zalyalova Z.A.1,2, Ilina G.R.1, Bagdanova N.I.1
-
Affiliations:
- Consultative and Diagnostic Center for Movement Disorders and Botulinum Therapy of Tatarstan Republic
- Kazan State Medical University
- Issue: Vol 18, No 2 (2024)
- Pages: 62-69
- Section: Reviews
- Submitted: 09.05.2023
- Accepted: 03.07.2023
- Published: 08.07.2024
- URL: https://www.annaly-nevrologii.com/journal/pathID/article/view/980
- DOI: https://doi.org/10.17816/ACEN.980
- ID: 980
Cite item
Abstract
This review describes the association between rapid eye movement (REM) sleep behavior disorder (RBD) and synucleinopathies, primarily Parkinson's disease. This article reviews the diagnostic criteria, the epidemiology of RBDs, their pathogenesis, and their association with early non-motor symptoms. The data are presented to assess the risk of phenoconversion of RBDs to Parkinson's disease or other synucleinopathies such as Lewy body dementia and multiple system atrophy. A prodromal period of RBDs may precede synucleinopathies years or decades before potential manifestation of motor, cognitive, or autonomic disorders, and this may be important for initiating the neuroprotective therapy. Other causes of RBDs are also reviewed.
Full Text
Rapid eye movement (REM) sleep behavior disorder (RBD) is characterized by dreaming, complex motor behavior, and loss of physiological muscle atonia. This behavior disorder is confused with REM sleep without atonia (RSWA), which is often detected by a sleep study. However, RSWA provides a neurophysiological substrate for full progression of RBD in the future [1]. When RBD is not associated with other apparent neurological disorders, it is called idiopathic RBD (iRBD). When accompanied by other neurological symptoms such as akinetic rigid syndrome, cognitive decline, metabolic disorders, etc., RBD is considered to be symptomatic and may be associated with neurodegenerative, autoimmune, and structural brain disorders and medications [2–16]. RBD most commonly begins in the 5th or 6th decade of life. However, in some cases, symptoms of iRBD (most notably, sleep-related motor activity) may manifest at a younger age [8, 11]. The frequency of motor events during the REM sleep can vary widely, from several episodes per night to one episode per month [8]. In each patient, the severity and frequency of RBD varies from night to night [11]. The mechanisms of such fluctuation remain unknown.
RBD was first described by S.N. Schenck et al. in 1986 [17]. No generally accepted criteria for diagnosing RBD exist to date. Questionnaires have been developed to identify RBD patients. However, they are not very specific. Patients with RBD are unaware of motor activity during sleep in 44% of cases and report good quality of sleep in 70% of cases [18]. The diagnosis of RBD usually requires an accurate observation history from a bed partner of the patient. In cases of doubt, or for patients who do not have a bed partner, a polysomnography can be performed.
According to the American Academy of Sleep Medicine's International Classification of Sleep Disorders, a sleep pattern must meet four criteria to diagnose an RBD:
- Repeated episodes of bed activity during the dream phase corresponding to the dream content,
- Episodes of motor activity during REM sleep, confirmed by polysomnography,
- No REM sleep atonia confirmed by polysomnography,
- No association with known adverse drug effects or substance abuse [19].
All of these factors complicate the determination of the exact RBT incidence. A large phone survey estimated the prevalence of iRBD to be 0.38% to 0.50% in the general population [20]. However, up to 4.8% of sleep clinic patients have RBD [21]. In 2013, a population-based study by S.H. Kang et al. showed that in Korea, the overall age- and sex-adjusted prevalence of RBD was 2.01% (1.15% for iRBD), and another 4.95% of the general population had isolated polysomnographically confirmed RSWA [22]. J. Haba-Rubio et al. estimated the incidence of RBD to be 1.06% in the middle-aged and elderly population in Switzerland [23]. Other population-based studies show that suspected RBD (without confirmatory polysomnography) is even more common, occurring in 5% to 6.8% of the elderly population over the age of 60–70 years [24, 25]. Although prevalence studies without confirmatory polysomnography may overestimate the incidence of RBD, their data suggest that burden of RBD has been significantly underestimated [26]. Some large studies have reported that RBD is more common in men than in women, but in patients under 50 years of age (with non-neurodegenerative RBD appearing to be more common) the incidence does not differ by sex [4, 6, 16, 18, 27–31]. The risk of RBD is 5 and 9–10 times higher in patients taking antidepressants and in those with a psychiatric diagnosis, respectively [4].
Cohort studies suggest that RBD (including iRBD) is closely associated with α-synucleinopathies, particularly Parkinson's disease (PD), dementia with Lewy bodies (DLB), and multiple system atrophy (MSA) [2–11, 13–15, 32–38]. In the largest multicenter study of RBD, B.F. Boeve et al. found that 94% of patients had abnormal accumulation of α-synuclein at autopsy, in some cases with accumulation of β-amyloid, τ-protein, or iron [5]. At the same time, the risk of phenoconversion of RBD to PD is approximately 15–35% over the 2–5-year period and increases to 91.9% when the observation period is extended to 12–25 years, making RBD by far the most specific clinical prodromal marker for PD [10, 39]. Investigating the validity of criteria for assessing the likelihood of prodromal PD and determining the independence of prodromal markers for predicting PD or DLB, S.M. Fereshtehnejad et al. found that diagnostic accuracy of International Parkinson and Movement Disorder Society criteria was highest in people with RBD [40, 41].
The mechanism of RBD development remains unclear. The states of wake and sleep are initiated and maintained by complex interplay between multiple brainstem and diencephalic nuclei. Dysregulation, structural damage, or degeneration of these nuclei can result in various circadian rhythm disorders. RBD is thought to cause an excitation/inhibition imbalance in the brainstem nuclei controlling REM muscle tone (Figure) [42].
Key brain regions and neurotransmitters involved in regulating and maintaining REM sleep in healthy people and RBD patients. In RBD, dysfunction within the SubC → VMM → Spinal Motor Neuron pathway results in a lack of REM sleep atonia (depicted by the dotted line).
BF, basal forebrain; LC, locus coeruleus; LDT/PPT, laterodorsal tegmentum/pedunculopontine tegmentum; LH, lateral hypothalamus; Subc/PC, subcoeruleus/pre-locus coeruleus; TMN, tuberomammillary nucleus; vlPAG, ventrolateral periaqueductal gray matter; VLPO/MnPO, ventrolateral preoptic nucleus/median preoptic nucleus; VMM, ventromedial medulla.
Movement during REM sleep is controlled by two systems: the extrapyramidal system controls the input to spinal cord motor neurons to generate muscle atonia, and the pyramidal system controls motorcortex activation to suppress locomotor activity. The main generator of REM sleep is the glutamatergic Subcoeruleus/Pre-Locus Coeruleus complex (SubC/PC), which is anatomically situated just below the noradrenergic locus coeruleus in the pons [43] and analogous to the rat/mouse sublaterodorsal nucleus. In addition to projecting to many subcortical brain regions to promote and maintain REM sleep, the SubC/PC pro-jects caudally to control the REM atonia [44]. Before and during REM sleep, the REM-active SubC/PC excites the inhibitory ventromedial medulla (VMM) and glycinergic neurons of the spinal ventral horn, which in turn tonically hyperpolarize spinal motor neurons [44, 45]. This results in a temporary paralysis of skeletal muscles and thus significantly reduced REM muscle tone (atonia) during REM sleep. It is not definitively known whether RBD is caused by an imbalance originating in the glutamatergic SubC/PC or downstream in the GABA/Glycinergic VMM, though animal studies suggest the latter is more likely [46]. This brainstem function disorder does not exist in isolation. Since RBD is characterized not just by an increase in small sleep twitches but also complex movements and dream enactment, it is likely that abnormal disinhibition occurs in the pyramidal motor tract during REM sleep, leading to execution of the complex movements “imagined” by the motor cortex. Neuroimaging studies have shown that RBD can also be accompanied with changes in multiple neurotransmitter systems, including the cholinergic, noradrenergic, and dopaminergic circuits [47]. Therefore, one of the key challenges in treating RBD derives from uncertainty about the underlying pathology and the extent of dysfunction throughout the brain.
It should be mentioned that the development of RBD in the prodromal phase of PD corresponds to the neurodegeneration concept proposed by H. Braak et al [48], according to which Lewy bodies begin to appear in the dorsal motor nucleus of the medulla (Braak stage I). Subsequently, deposits appear more rostrally, in the reticular formation and in the SubC/PC nucleus region (Braak stage II) [15, 49–52]. Therefore, patients with RBD may formally be in Braak stage II of the neurodegenerative process or in the so-called prodromal phase of PD. This was confirmed in several studies by the presence of non-specific signs of PD in the form of hyposmia and sympathetic denervation of the myocardium in these patients [4, 14, 15]. In the third and subsequent Braak sta- ges of the neurodegenerative process, α-synuclein accumulation progresses, involving the substantia nigra, the pedunculopontine nucleus, and the amygdala. At Braak stage IV, degeneration of the substantia nigra reaches a qualitative threshold when akinetic rigid syndrome manifests clinically [48].
However, RBD may not be observed in all patients with α-synucleinopathy, and this is likely to reflect variability in the topographic onset and progression of neurodegeneration in patients. Considering this, an alternative concept of disease progression has been proposed. This unified staging system classifies Lewy body diseases by the distribution of the abnormal protein. Stage I denotes the presence of abnormal α-synuclein in the olfactory bulbs only. Then α-synuclein accumulates predominantly in the brainstem (stage IIA), in the limbic system (stage IIb), in the brainstem and limbic system (stage III), and in the neocortex (stage IV). Progression through these neurodegenerative stages correlated with increased α-synuclein density in certain regions and clinical deterioration of cognitive impairment and motor dysfunction [53]. J. Horsager et al. recently hypothesized that PD comprises two subtypes based on progression patterns: brain-first PD and body-first PD [54]. According to the “brain-first” hypothesis, abnormal α-synuclein first affects the brain and then spreads in a caudal gradient to the peripheral autonomic nervous system [54, 55]. According to the “body-first” hypothesis, abnormal α-synuclein is first formed in the peripheral autonomic nervous system and spreads rostrally into the brain along the autonomic nerves, primarily along the n. vagus [54, 55]. This hypothesis is consistent with the fact of intercellular transmission of abnormal α-synuclein in cellular and animal models of PD [56]. However, it remains controversial because no cases have been reported showing that abnormal α-synuclein exists only in the peripheral nervous system and not in the brain [57–59]. It should be noted that these newly proposed concepts can explain that PD is often preceded and accompanied by prodromal and progressive non-motor symptoms and signs [60, 61].
Another unsolved issue is that some patients with RBD and PD do not fit the Braak model of neurodegeneration progression. In some patients, RBD may manifest at the same time or significantly later than the development of cognitive, motor, or autonomic symptoms of PD or DLB, and these RBDs are in fact secondary/symptomatic to a neurodegenerative process [6, 62]. However, RBD has the same features as iRBD.
Some evidence suggests that PD associated with RBD is phenotypically different from PD without RBD. Patients with RBD-associated PD have more severe and diffuse neurodegeneration, which is associated with a greater deterioration in quality of life, cognitive impairment, psychiatric complications, and slowing of the awake background electroencephalogram, more severe autonomic dysfunction, akinetic rigid syndrome, and longer disease duration [63–67]. Recent studies confirm that the motor phenotype of RBD-associated PD is more severe than in PD without RBD, with a greater tendency toward akinetic rigid syndrome, poor response to levodopa, lack of tremor, earlier and more severe gait disturbances, and longer disease duration [68, 69]. Motor decline also appears to be faster in patients with PD and RBD than in patients without RBD [70]. Study results on the effect of RBD on cognitive impairment are controversial [71–73].
Other synucleinopathies are also associated with RBD. For example, in DLB, which is characterized by the presence of dementia in combination with parkinsonism, visual hallucinations, and fluctuations in cognitive status and sleep/wake state, 80% of patients develop RBD several years before the appearance of other clinical signs [74, 75]. RBD is diagnosed in more than 88% of patients with multiple system atrophy [76]. RBD has been reported to be associated with clinically diagnosed Alzheimer's disease [77]. However, a concomitant Lewy body disorder should still be suspected in RBD, as the largest autopsy study of RBD patients to date found synucleinopathies in 94% of patients [5]. RBD has also been reported in association with progressive supranuclear palsy, although in contrast to synucleinopathies, RBD symptoms accompany rather than precede motor dysfunction in progressive supranuclear palsy [78]. In other primary tauopathies, RBD is very rare [79]. There are few reports on its association with Guadelupian parkinsonism (tauopathy) and the autoimmune anti-IgLON5 disease. In the latter, deposition of τ protein in the brain and hypothalamus has been demonstrated in deceased patients [80, 81].
It should be noted that iRBD occurring at a younger age, i.e. before the age of 50, is more often associated with non-neurodegenerative processes such as narcolepsy, autoimmune disorders, antidepressant use, or structural brain lesions. Almost half of patients with type 1 narcolepsy (narcolepsy with cataplexy) are reported to have RSWA with or without RBD [82–85]. The RBD associated with narcolepsy typically develops much earlier, between the 2nd and 4th decades of life, likely due to the pathophysiology of type 1 narcolepsy with the unstable REM sleep phase in narcolepsy with hypocretin deficiency [82]. In young and elderly patients, RBD may be a manifestation of paraneoplastic and autoimmune neurological disorders such as Morvan syndrome (caused by antibodies to voltage-gated calcium channels) or autoimmune brain disorders (anti-IgLON5 disease and brainstem lesions associated with inflammatory, neoplastic, or cerebrovascular disorders) [7, 86–91]. In addition, the use of selective serotonin reuptake inhibitors, selective norepinephrine reuptake inhibitors, and tricyclic antidepressants was associated with symptoms of RBD and RSWA without RBD. It remains unclear whether the RBD/RSWA association with antidepressants is mediated by either reversible pharmacological effects, or whether antidepressants lead to RSWA and RBD detection in predisposed individuals with latent synucleinopathy [11, 14, 16, 30].
Therefore, RBDs, whether idiopathic or symptomatic, are closely associated with neurodegeneration, particularly with synucleinopathies such as PD, DLB, and MSA [92–94]. A prodromal period of RBDs may precede synucleinopathies years or decades before potential manifestation of motor, cognitive, or autonomic disorders, and this may be important for initiating the neuroprotective therapy in order to prevent RBD phenoconversion to PD, DLB, or MSA. More data is required to understand RBDs, how they progress clinically, and how to treat them.
About the authors
Diana M. Khasanova
Consultative and Diagnostic Center for Movement Disorders and Botulinum Therapy of Tatarstan Republic
Author for correspondence.
Email: diana.khasanova1987@gmail.com
ORCID iD: 0000-0002-1831-330X
SPIN-code: 8638-5837
Scopus Author ID: 57204923376
ResearcherId: GNW-6535-2022
Cand. Sci. (Med.), neurologist, movement disorders specialist, Consultative and Diagnostic Center for Movement Disorders and Botulinum therapy of Tatarstan Republic
Россия, KazanZuleykha A. Zalyalova
Consultative and Diagnostic Center for Movement Disorders and Botulinum Therapy of Tatarstan Republic; Kazan State Medical University
Email: z.zalyalova@gmail.com
ORCID iD: 0000-0001-8718-7266
SPIN-code: 9481-9152
D. Sci. (Med.), Professor, Neurology and rehabi- litation department, Kazan State Medical University; Head, Consultative and Diagnostic Center for Movement Disorders and Botulinum therapy of Tatarstan Republic
Россия, Kazan; KazanGuzal R. Ilina
Consultative and Diagnostic Center for Movement Disorders and Botulinum Therapy of Tatarstan Republic
Email: gusall_@mail.ru
ORCID iD: 0000-0002-0292-8182
Cand. Sci. (Med.), neurologist, Consultative and Diagnostic Center for Movement Disorders and Botulinum therapy of Tatarstan Republic
Россия, KazanNailya I. Bagdanova
Consultative and Diagnostic Center for Movement Disorders and Botulinum Therapy of Tatarstan Republic
Email: nelia.bagdanova@gmail.com
ORCID iD: 0009-0005-7292-6069
Cand. Sci. (Med.), neurologist, Consultative and Diagnostic Center for Movement Disorders and Botulinum therapy of Tatarstan Republic
Россия, KazanReferences
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