Progression and prognosis in multiple system atrophy presenting with REM behavior disorder.

Area of Science:

• Neurology
• Sleep Medicine
• Neurodegenerative Diseases

Background:

• Multiple system atrophy (MSA) is a progressive neurodegenerative disorder.
• REM sleep behavior disorder (RBD) is a parasomnia characterized by loss of muscle atonia during REM sleep.
• The relationship between RBD and MSA onset requires further investigation.

Purpose of the Study:

• To determine the prevalence of RBD as an initial sign of MSA.
• To compare disease progression and prognosis in MSA patients with RBD preceding (pre-RBD) versus following (post-RBD) disease onset.

Main Methods:

• Retrospective analysis of 158 MSA patients evaluated annually.
• Classification of disease onset based on initial motor or autonomic symptoms.
• Collection of symptom occurrence, disease progression milestones, and survival data.
• Confirmation of RBD via video-polysomnography.

Main Results:

• RBD preceded MSA onset in 27% of patients, with a median latency of 3 years.
• The pre-RBD group exhibited increased autonomic onset, reduced parkinsonism, and earlier onset of stridor, pyramidal signs, orthostatic hypotension, urinary dysfunction, dysphagia, and wheelchair dependency.
• Patients with pre-RBD faced a higher risk of mortality.

Conclusions:

• RBD is a frequent mode of presentation in MSA.
• MSA patients with pre-RBD experience more rapid disease progression.
• Early identification of RBD and vigilant monitoring of autonomic dysfunction and stridor in pre-RBD patients are recommended.