Effects of sleep disorders on the non-motor symptoms of Parkinson disease

• Published in: Journal of clinical sleep medicine 2013-11, Vol.9 (11), p.1119-1129
• Main Authors: Neikrug, Ariel B, Maglione, Jeanne E, Liu, Lianqi, Natarajan, Loki, Avanzino, Julie A, Corey-Bloom, Jody, Palmer, Barton W, Loredo, Jose S, Ancoli-Israel, Sonia
• Format: Article
• Language: English
• Subjects: Aged; Aged, 80 and over; Causality; Cognition Disorders - epidemiology; Cognition Disorders - physiopathology; Comorbidity; Cross-Sectional Studies; Depression - epidemiology; Depression - physiopathology; Disorders of Excessive Somnolence - epidemiology; Disorders of Excessive Somnolence - physiopathology; Fatigue - epidemiology; Fatigue - physiopathology; Female; Humans; Male; Middle Aged; Neuropsychological Tests - statistics & numerical data; New Research; Nocturnal Myoclonus Syndrome; Parkinson Disease - epidemiology; Parkinson Disease - physiopathology; Quality of Life; REM Sleep Behavior Disorder - epidemiology; REM Sleep Behavior Disorder - physiopathology; Restless Legs Syndrome - epidemiology; Restless Legs Syndrome - physiopathology; Severity of Illness Index; Sleep Apnea, Obstructive - epidemiology; Sleep Apnea, Obstructive - physiopathology; Sleep Stages - physiology; Sleep Wake Disorders - epidemiology; Sleep Wake Disorders - physiopathology; Surveys and Questionnaires
• ISSN: 1550-9389; 1550-9397
• DOI: 10.5664/jcsm.3148

To evaluate the impact of sleep disorders on non-motor symptoms in patients with Parkinson disease (PD). This was a cross-sectional study. Patients with PD were evaluated for obstructive sleep apnea (OSA), restless legs syndrome (RLS), periodic limb movement syndrome (PLMS), and REM sleep behavior disorder (RBD). Cognition was assessed with the Montreal Cognitive Assessment and patients completed self-reported questionnaires assessing non-motor symptoms including depressive symptoms, fatigue, sleep complaints, daytime sleepiness, and quality of life. Sleep laboratory. 86 patients with PD (mean age = 67.4 ± 8.8 years; range: 47-89; 29 women). N/A. Having sleep disorders was a predictor of overall non-motor symptoms in PD (R(2) = 0.33, p < 0.001) while controlling for age, PD severity, and dopaminergic therapy. These analyses revealed that RBD (p = 0.006) and RLS (p = 0.014) were significant predictors of increased non-motor symptoms, but OSA was not. More specifically, having a sleep disorder significantly predicted sleep complaints (ΔR(2) = 0.13, p = 0.006), depressive symptoms (ΔR(2) = 0.01, p = 0.03), fatigue (ΔR(2) = 0.12, p = 0.007), poor quality of life (ΔR(2) = 0.13, p = 0.002), and cognitive decline (ΔR(2) = 0.09, p = 0.036). Additionally, increasing number of sleep disorders (0, 1, or ≥ 2 sleep disorders) was a significant contributor to non-motor symptom impairment (R(2) = 0.28, p < 0.001). In this study of PD patients, presence of comorbid sleep disorders predicted more non-motor symptoms including increased sleep complaints, more depressive symptoms, lower quality of life, poorer cognition, and more fatigue. RBD and RLS were factors of overall increased non-motor symptoms, but OSA was not.