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IntroductionRapid Eye Movement Sleep Behavior Disorder (RBD) and hyposmia are common in synucleinopathies and they tend to occur in connection to the prodromal development of these disorders. In this study, we sought to determine the prevalence of RBD and hyposmia and the timeline of their occurrence in a large cohort of Moroccan patients.MethodsWe recruited 774 consecutive patients with synucleinopathy and tauopathy at Ibn Rochd University Hospital of Casablanca. A group of 100 healthy controls was also recruited. We relied on a questionnaire to collect general characteristics and clinical data filled by the patient and his companion under the supervision of a qualified health professional.ResultsThe study included 697 patients with PD, 37 with DLB and 40 had a tauopathy disorder (PSP or CBD). The proportion of patients who have RBD was 52% in PD, 100% in DLB, 0% in tauopathies and 12% among healthy controls. Hyposmia symptom was found in 47% of patients with PD, 68% in patients with DLB, 0% in tauopathy patients and in 10% of healthy controls. Moreover, 46% of PD patients and 75% of DLB patients developed RBD during the prodromal phase. Meanwhile, hyposmia occurred in association with the prodromal phase among 67% of PD cases and 85% of DLB patients.ConclusionRBD and hyposmia are both prevalent among Moroccan patients with synucleinopathy and they occur frequently during the prodromal phase. Identifying these premotor signs will improve early and differential diagnosis and enhance our understanding of how a specific synucleinopathy progresses.
Acta Neurologica Belgica – Springer Journals
Published: Dec 1, 2023
Keywords: Rapid Eye Movement Sleep Behavior Disorder; Hyposmia; Synucleinopathies; Tauopathies; Prodromal phase
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