Left-hemispheric predominance of nigrostriatal deficit in isolated REM sleep behavior disorder.
Adult
Aged
Corpus Striatum
/ metabolism
Dopamine
/ metabolism
Dopamine Plasma Membrane Transport Proteins
/ metabolism
Female
Humans
Male
Middle Aged
Neuroimaging
/ methods
Parkinson Disease
/ metabolism
Putamen
/ diagnostic imaging
REM Sleep Behavior Disorder
/ diagnosis
Substantia Nigra
/ diagnostic imaging
Ultrasonography, Doppler, Transcranial
/ methods
Journal
Neurology
ISSN: 1526-632X
Titre abrégé: Neurology
Pays: United States
ID NLM: 0401060
Informations de publication
Date de publication:
14 04 2020
14 04 2020
Historique:
received:
24
03
2019
accepted:
17
10
2019
pubmed:
13
3
2020
medline:
14
8
2020
entrez:
13
3
2020
Statut:
ppublish
Résumé
Unilateral onset of parkinsonism due to nigrostriatal damage of the contralateral hemisphere is frequent in Parkinson disease (PD). There is evidence for a left-hemispheric bias of motor asymmetry in right-handed patients with PD indicating a hemispheric dominance. Isolated REM sleep behavior disorder (IRBD) constitutes the prodromal stage of PD and other synucleinopathies. To test the hypothesis that right-handed patients with IRBD exhibit left-hemispheric predominance of subclinical nigrostriatal dysfunction, we evaluated this aspect using neuroimaging instruments. In 167 right-handed patients with IRBD without parkinsonism, we evaluated in each hemisphere the integrity of the striatal dopaminergic terminals by dopamine transporter (DAT)-SPECT and the substantia nigra echogenicity by transcranial sonography. DAT-SPECT showed lower specific binding ratio (SBR) in the left striatum and left caudate nucleus than in the right striatum and right caudate nucleus. The percentage of patients with lower SBR was greater in the left striatum and left caudate nucleus than in the right striatum and right caudate nucleus. In those who developed a synucleinopathy in <5 years from DAT-SPECT, there was a lower SBR in the left putamen and left caudate nucleus than in the right putamen and right caudate nucleus. Substantia nigra echogenic size was greater in the left than in the right side in patients with hyperechogenicity and among individuals who phenoconverted in <5 years from transcranial sonography. Right-handed patients with IRBD exhibit left-hemispheric predominance of subclinical nigrostriatal dysfunction. In premotor PD, the neurodegenerative process begins asymmetrically, initially impairing the nigrostriatal system of the dominant hemisphere.
Identifiants
pubmed: 32161031
pii: WNL.0000000000009246
doi: 10.1212/WNL.0000000000009246
doi:
Substances chimiques
Dopamine Plasma Membrane Transport Proteins
0
Dopamine
VTD58H1Z2X
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e1605-e1613Informations de copyright
© 2020 American Academy of Neurology.