A case‐control‐family study of idiopathic rapid eye movement sleep behavior disorder
To determine the familial aggregation of idiopathic rapid eye movement sleep behavior disorder (iRBD), neurodegenerative diseases, and related biomarkers.
A total of 404 and 387 first‐degree relatives of 102 patients with iRBD and 89 controls were recruited, respectively. Among them, 204 and 208 relatives of patients and controls underwent face‐to‐face clinical assessment, while 97 and 75 relatives underwent further video‐polysomnographic assessment, respectively.
Compared with relatives of controls, relatives of patients demonstrated higher levels of RBD features including chin tonic electromyography activity (mean: 1.5±7.5 vs. 0.3±1.0, p=0.04) and behavioral events (n [weighted %]: 12 [11.3] vs. 2 [1.9], adjusted hazard ratio [aHR]=7.69, 95% confidence interval [CI]=1.54‐33.33, p=0.009) during rapid eye movement sleep, probable diagnosis (n [%]: 57 [14.9] vs. 20 [4.9], aHR=3.45, 95% CI=1.96‐6.25, p <0.001), and definite diagnosis (n [weighted %]: 10 [8.4] vs. 2 [1.4], aHR=5.56, 95% CI=1.16‐25.00, p=0.03). They also had higher risks of Parkinson's disease (3.1% vs 0.5%, aHR=5.88, 95% CI=1.37‐25.00, p=0.02), dementia (6.9% vs. 2.6%, aHR=2.44, 95% CI=1.15‐5.26, p=0.02), constipation (8.3% vs. 2.4%, adjusted odds ratio=4.21, 95% CI=1.34‐13.17, p=0.01), and motor dysfunction (MDS‐UPDRS part III motor score, mean: 1.9±3.2 vs. 0.9±2.3, p=0.002). The unaffected relatives of patients demonstrated a higher likelihood ratio of prodromal Parkinson's disease (median [interquartile range]: 0.27 [1.19] vs. 0.22 [0.51], p=0.03).
iRBD is familial aggregated from isolated features to full‐blown sleep disorder. Relatives of patients carry a higher risk of alpha‐synucleinopathy in terms of neurodegenerative diseases and prodromal markers, suggesting a familial aggregation and staging pathology of alpha‐synucleinopathy.
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