Five-year follow-up of substantia nigra echogenicity in idiopathic REM sleep behavior disorder.
Identifieur interne : 000348 ( PubMed/Corpus ); précédent : 000347; suivant : 000349Five-year follow-up of substantia nigra echogenicity in idiopathic REM sleep behavior disorder.
Auteurs : Alex Iranzo ; Heike Stockner ; M Nica Serradell ; Klaus Seppi ; Francesc Valldeoriola ; Birgit Frauscher ; José Luis Molinuevo ; Isabel Vilaseca ; Thomas Mitterling ; Carles Gaig ; Dolores Vilas ; Joan Santamaria ; Birgit Högl ; Eduard Tolosa ; Werner PoeweSource :
- Movement disorders : official journal of the Movement Disorder Society [ 1531-8257 ] ; 2014.
English descriptors
- KwdEn :
- Aged, Cohort Studies, Female, Follow-Up Studies, Humans, Male, Middle Aged, Parkinson Disease (complications), Parkinson Disease (ultrasonography), Prospective Studies, REM Sleep Behavior Disorder (etiology), REM Sleep Behavior Disorder (ultrasonography), Substantia Nigra (ultrasonography), Ultrasonography, Doppler, Transcranial (methods).
- MESH :
- complications : Parkinson Disease.
- etiology : REM Sleep Behavior Disorder.
- methods : Ultrasonography, Doppler, Transcranial.
- ultrasonography : Parkinson Disease, REM Sleep Behavior Disorder, Substantia Nigra.
- Aged, Cohort Studies, Female, Follow-Up Studies, Humans, Male, Middle Aged, Prospective Studies.
Abstract
Hyperechogenicity of the substantia nigra visualized by transcranial sonography occurs in most Parkinson's disease (PD) patients. Idiopathic rapid eye movement (REM) sleep behavior disorder (IRBD) subjects eventually develop PD and other synucleinopathies. This study was undertaken to evaluate whether in IRBD, transcranial sonography identifies subjects who convert to PD and other synucleinopathies, and whether substantia nigra echogenic size changes with time. It was a prospective study in which 55 IRBD patients underwent transcranial sonography at baseline and were invited to follow-up after 5 years. Patients were assessed by the same experienced sonographer who was blinded to clinical data and baseline transcranial sonography results, and used the same equipment and adjustments. Twenty-one (38.2%) subjects were diagnosed with a synucleinopathy (PD in 11, dementia with Lewy bodies in nine, and multiple system atrophy in one). Sensitivity of baseline substantia nigra hyperechogenicity for the development of a synucleinopathy was 42.1%, specificity 67.7%, positive predictive value 44.4%, negative predictive value 65.6%, and relative risk 1.29. No differences were detected between the first and second examination in mean size of the substantia nigra (0.20 ± 0.09 cm(2) vs. 0.19 ± 0.07 cm(2) ; P = 0.777) and in percentage of patients with substantia nigra hyperechogenicity (33.3% vs. 42.8%, P = 0.125). Transcranial sonography of the substantia nigra alone is not a useful tool to identify IRBD subjects at risk for the development of PD or a synucleinopathy after 5 years of follow-up. In IRBD, transcranial sonography cannot be used to monitor the degenerative process in the substantia nigra, because echogenicity size remains stable over time.
DOI: 10.1002/mds.26055
PubMed: 25384461
Links to Exploration step
pubmed:25384461Le document en format XML
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<author><name sortKey="Stockner, Heike" sort="Stockner, Heike" uniqKey="Stockner H" first="Heike" last="Stockner">Heike Stockner</name>
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<front><div type="abstract" xml:lang="en">Hyperechogenicity of the substantia nigra visualized by transcranial sonography occurs in most Parkinson's disease (PD) patients. Idiopathic rapid eye movement (REM) sleep behavior disorder (IRBD) subjects eventually develop PD and other synucleinopathies. This study was undertaken to evaluate whether in IRBD, transcranial sonography identifies subjects who convert to PD and other synucleinopathies, and whether substantia nigra echogenic size changes with time. It was a prospective study in which 55 IRBD patients underwent transcranial sonography at baseline and were invited to follow-up after 5 years. Patients were assessed by the same experienced sonographer who was blinded to clinical data and baseline transcranial sonography results, and used the same equipment and adjustments. Twenty-one (38.2%) subjects were diagnosed with a synucleinopathy (PD in 11, dementia with Lewy bodies in nine, and multiple system atrophy in one). Sensitivity of baseline substantia nigra hyperechogenicity for the development of a synucleinopathy was 42.1%, specificity 67.7%, positive predictive value 44.4%, negative predictive value 65.6%, and relative risk 1.29. No differences were detected between the first and second examination in mean size of the substantia nigra (0.20 ± 0.09 cm(2) vs. 0.19 ± 0.07 cm(2) ; P = 0.777) and in percentage of patients with substantia nigra hyperechogenicity (33.3% vs. 42.8%, P = 0.125). Transcranial sonography of the substantia nigra alone is not a useful tool to identify IRBD subjects at risk for the development of PD or a synucleinopathy after 5 years of follow-up. In IRBD, transcranial sonography cannot be used to monitor the degenerative process in the substantia nigra, because echogenicity size remains stable over time.</div>
</front>
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<Abstract><AbstractText>Hyperechogenicity of the substantia nigra visualized by transcranial sonography occurs in most Parkinson's disease (PD) patients. Idiopathic rapid eye movement (REM) sleep behavior disorder (IRBD) subjects eventually develop PD and other synucleinopathies. This study was undertaken to evaluate whether in IRBD, transcranial sonography identifies subjects who convert to PD and other synucleinopathies, and whether substantia nigra echogenic size changes with time. It was a prospective study in which 55 IRBD patients underwent transcranial sonography at baseline and were invited to follow-up after 5 years. Patients were assessed by the same experienced sonographer who was blinded to clinical data and baseline transcranial sonography results, and used the same equipment and adjustments. Twenty-one (38.2%) subjects were diagnosed with a synucleinopathy (PD in 11, dementia with Lewy bodies in nine, and multiple system atrophy in one). Sensitivity of baseline substantia nigra hyperechogenicity for the development of a synucleinopathy was 42.1%, specificity 67.7%, positive predictive value 44.4%, negative predictive value 65.6%, and relative risk 1.29. No differences were detected between the first and second examination in mean size of the substantia nigra (0.20 ± 0.09 cm(2) vs. 0.19 ± 0.07 cm(2) ; P = 0.777) and in percentage of patients with substantia nigra hyperechogenicity (33.3% vs. 42.8%, P = 0.125). Transcranial sonography of the substantia nigra alone is not a useful tool to identify IRBD subjects at risk for the development of PD or a synucleinopathy after 5 years of follow-up. In IRBD, transcranial sonography cannot be used to monitor the degenerative process in the substantia nigra, because echogenicity size remains stable over time.</AbstractText>
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