Dopaminergic imaging and clinical predictors for phenoconversion of REM sleep behaviour disorder

This is an international multicentre study aimed at evaluating the combined value of dopaminergic neuroimaging and clinical features in predicting future phenoconversion of idiopathic REM sleep behaviour (iRBD) subjects to overt synucleinopathy. Nine centres sent 123I-FP-CIT-SPECT data of 344 iRBD p...

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Veröffentlicht in:Brain (London, England : 1878) England : 1878), 2021-02, Vol.144 (1), p.278-287
Hauptverfasser: Arnaldi, Dario, Chincarini, Andrea, Hu, Michele T, Sonka, Karel, Boeve, Bradley, Miyamoto, Tomoyuki, Puligheddu, Monica, De Cock, Valérie Cochen, Terzaghi, Michele, Plazzi, Giuseppe, Tachibana, Naoko, Morbelli, Silvia, Rolinski, Michal, Dusek, Petr, Lowe, Val, Miyamoto, Masayuki, Figorilli, Michela, Verbizier, Delphine de, Bossert, Irene, Antelmi, Elena, Meli, Riccardo, Barber, Thomas R, Trnka, Jiří, Miyagawa, Toji, Serra, Alessandra, Pizza, Fabio, Bauckneht, Matteo, Bradley, Kevin M, Zogala, David, McGowan, Daniel R, Jordan, Lennon, Manni, Raffaele, Nobili, Flavio
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container_title Brain (London, England : 1878)
container_volume 144
creator Arnaldi, Dario
Chincarini, Andrea
Hu, Michele T
Sonka, Karel
Boeve, Bradley
Miyamoto, Tomoyuki
Puligheddu, Monica
De Cock, Valérie Cochen
Terzaghi, Michele
Plazzi, Giuseppe
Tachibana, Naoko
Morbelli, Silvia
Rolinski, Michal
Dusek, Petr
Lowe, Val
Miyamoto, Masayuki
Figorilli, Michela
Verbizier, Delphine de
Bossert, Irene
Antelmi, Elena
Meli, Riccardo
Barber, Thomas R
Trnka, Jiří
Miyagawa, Toji
Serra, Alessandra
Pizza, Fabio
Bauckneht, Matteo
Bradley, Kevin M
Zogala, David
McGowan, Daniel R
Jordan, Lennon
Manni, Raffaele
Nobili, Flavio
description This is an international multicentre study aimed at evaluating the combined value of dopaminergic neuroimaging and clinical features in predicting future phenoconversion of idiopathic REM sleep behaviour (iRBD) subjects to overt synucleinopathy. Nine centres sent 123I-FP-CIT-SPECT data of 344 iRBD patients and 256 controls for centralized analysis. 123I-FP-CIT-SPECT images were semiquantified using DaTQUANTTM, obtaining putamen and caudate specific to non-displaceable binding ratios (SBRs). The following clinical variables were also analysed: (i) Movement Disorder Society-sponsored revision of the Unified Parkinson's Disease Rating Scale, motor section score; (ii) Mini-Mental State Examination score; (iii) constipation; and (iv) hyposmia. Kaplan-Meier survival analysis was performed to estimate conversion risk. Hazard ratios for each variable were calculated with Cox regression. A generalized logistic regression model was applied to identify the best combination of risk factors. Bayesian classifier was used to identify the baseline features predicting phenoconversion to parkinsonism or dementia. After quality check of the data, 263 iRBD patients (67.6 ± 7.3 years, 229 males) and 243 control subjects (67.2 ± 10.1 years, 110 males) were analysed. Fifty-two (20%) patients developed a synucleinopathy after average follow-up of 2 years. The best combination of risk factors was putamen dopaminergic dysfunction of the most affected hemisphere on imaging, defined as the lower value between either putamina (P 
doi_str_mv 10.1093/brain/awaa365
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Nine centres sent 123I-FP-CIT-SPECT data of 344 iRBD patients and 256 controls for centralized analysis. 123I-FP-CIT-SPECT images were semiquantified using DaTQUANTTM, obtaining putamen and caudate specific to non-displaceable binding ratios (SBRs). The following clinical variables were also analysed: (i) Movement Disorder Society-sponsored revision of the Unified Parkinson's Disease Rating Scale, motor section score; (ii) Mini-Mental State Examination score; (iii) constipation; and (iv) hyposmia. Kaplan-Meier survival analysis was performed to estimate conversion risk. Hazard ratios for each variable were calculated with Cox regression. A generalized logistic regression model was applied to identify the best combination of risk factors. Bayesian classifier was used to identify the baseline features predicting phenoconversion to parkinsonism or dementia. After quality check of the data, 263 iRBD patients (67.6 ± 7.3 years, 229 males) and 243 control subjects (67.2 ± 10.1 years, 110 males) were analysed. Fifty-two (20%) patients developed a synucleinopathy after average follow-up of 2 years. The best combination of risk factors was putamen dopaminergic dysfunction of the most affected hemisphere on imaging, defined as the lower value between either putamina (P &lt; 0.000001), constipation, (P &lt; 0.000001) and age over 70 years (P = 0.0002). Combined features obtained from the generalized logistic regression achieved a hazard ratio of 5.71 (95% confidence interval 2.85-11.43). Bayesian classifier suggested that patients with higher Mini-Mental State Examination score and lower caudate SBR asymmetry were more likely to develop parkinsonism, while patients with the opposite pattern were more likely to develop dementia. This study shows that iRBD patients older than 70 with constipation and reduced nigro-putaminal dopaminergic function are at high risk of short-term phenoconversion to an overt synucleinopathy, providing an effective stratification approach for future neuroprotective trials. Moreover, we provide cut-off values for the significant predictors of phenoconversion to be used in single subjects.</description><identifier>ISSN: 0006-8950</identifier><identifier>EISSN: 1460-2156</identifier><identifier>DOI: 10.1093/brain/awaa365</identifier><identifier>PMID: 33348363</identifier><language>eng</language><publisher>England: Oxford University Press</publisher><subject>Aged ; Caudate Nucleus - diagnostic imaging ; Caudate Nucleus - metabolism ; Dopamine Plasma Membrane Transport Proteins - metabolism ; Engineering Sciences ; Female ; Humans ; Kaplan-Meier Estimate ; Male ; Middle Aged ; Original ; Putamen - diagnostic imaging ; Putamen - metabolism ; REM Sleep Behavior Disorder - diagnostic imaging ; REM Sleep Behavior Disorder - metabolism ; Retrospective Studies ; ROC Curve ; Synucleinopathies - diagnostic imaging ; Synucleinopathies - metabolism ; Tomography, Emission-Computed, Single-Photon ; Tropanes</subject><ispartof>Brain (London, England : 1878), 2021-02, Vol.144 (1), p.278-287</ispartof><rights>The Author(s) (2020). Published by Oxford University Press on behalf of the Guarantors of Brain. All rights reserved. For permissions, please email: journals.permissions@oup.com.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><rights>The Author(s) (2020). Published by Oxford University Press on behalf of the Guarantors of Brain. All rights reserved. For permissions, please email: journals.permissions@oup.com 2020</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c421t-89237a7e7711b2c8724af2fee5a4d74d84f9f67ed3b7d9f49148c517b36bab7b3</citedby><cites>FETCH-LOGICAL-c421t-89237a7e7711b2c8724af2fee5a4d74d84f9f67ed3b7d9f49148c517b36bab7b3</cites><orcidid>0000-0003-3372-1667 ; 0000-0001-5773-9656 ; 0000-0003-4850-9677 ; 0000-0002-1937-9116 ; 0000-0001-6937-3065 ; 0000-0002-1638-1384 ; 0000-0001-9811-0897 ; 0000-0002-6837-6608 ; 0000-0003-1739-6139</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,777,781,882,27905,27906</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/33348363$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://imt-mines-ales.hal.science/hal-03584080$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Arnaldi, Dario</creatorcontrib><creatorcontrib>Chincarini, Andrea</creatorcontrib><creatorcontrib>Hu, Michele T</creatorcontrib><creatorcontrib>Sonka, Karel</creatorcontrib><creatorcontrib>Boeve, Bradley</creatorcontrib><creatorcontrib>Miyamoto, Tomoyuki</creatorcontrib><creatorcontrib>Puligheddu, Monica</creatorcontrib><creatorcontrib>De Cock, Valérie Cochen</creatorcontrib><creatorcontrib>Terzaghi, Michele</creatorcontrib><creatorcontrib>Plazzi, Giuseppe</creatorcontrib><creatorcontrib>Tachibana, Naoko</creatorcontrib><creatorcontrib>Morbelli, Silvia</creatorcontrib><creatorcontrib>Rolinski, Michal</creatorcontrib><creatorcontrib>Dusek, Petr</creatorcontrib><creatorcontrib>Lowe, Val</creatorcontrib><creatorcontrib>Miyamoto, Masayuki</creatorcontrib><creatorcontrib>Figorilli, Michela</creatorcontrib><creatorcontrib>Verbizier, Delphine de</creatorcontrib><creatorcontrib>Bossert, Irene</creatorcontrib><creatorcontrib>Antelmi, Elena</creatorcontrib><creatorcontrib>Meli, Riccardo</creatorcontrib><creatorcontrib>Barber, Thomas R</creatorcontrib><creatorcontrib>Trnka, Jiří</creatorcontrib><creatorcontrib>Miyagawa, Toji</creatorcontrib><creatorcontrib>Serra, Alessandra</creatorcontrib><creatorcontrib>Pizza, Fabio</creatorcontrib><creatorcontrib>Bauckneht, Matteo</creatorcontrib><creatorcontrib>Bradley, Kevin M</creatorcontrib><creatorcontrib>Zogala, David</creatorcontrib><creatorcontrib>McGowan, Daniel R</creatorcontrib><creatorcontrib>Jordan, Lennon</creatorcontrib><creatorcontrib>Manni, Raffaele</creatorcontrib><creatorcontrib>Nobili, Flavio</creatorcontrib><title>Dopaminergic imaging and clinical predictors for phenoconversion of REM sleep behaviour disorder</title><title>Brain (London, England : 1878)</title><addtitle>Brain</addtitle><description>This is an international multicentre study aimed at evaluating the combined value of dopaminergic neuroimaging and clinical features in predicting future phenoconversion of idiopathic REM sleep behaviour (iRBD) subjects to overt synucleinopathy. Nine centres sent 123I-FP-CIT-SPECT data of 344 iRBD patients and 256 controls for centralized analysis. 123I-FP-CIT-SPECT images were semiquantified using DaTQUANTTM, obtaining putamen and caudate specific to non-displaceable binding ratios (SBRs). The following clinical variables were also analysed: (i) Movement Disorder Society-sponsored revision of the Unified Parkinson's Disease Rating Scale, motor section score; (ii) Mini-Mental State Examination score; (iii) constipation; and (iv) hyposmia. Kaplan-Meier survival analysis was performed to estimate conversion risk. Hazard ratios for each variable were calculated with Cox regression. A generalized logistic regression model was applied to identify the best combination of risk factors. Bayesian classifier was used to identify the baseline features predicting phenoconversion to parkinsonism or dementia. After quality check of the data, 263 iRBD patients (67.6 ± 7.3 years, 229 males) and 243 control subjects (67.2 ± 10.1 years, 110 males) were analysed. Fifty-two (20%) patients developed a synucleinopathy after average follow-up of 2 years. The best combination of risk factors was putamen dopaminergic dysfunction of the most affected hemisphere on imaging, defined as the lower value between either putamina (P &lt; 0.000001), constipation, (P &lt; 0.000001) and age over 70 years (P = 0.0002). Combined features obtained from the generalized logistic regression achieved a hazard ratio of 5.71 (95% confidence interval 2.85-11.43). Bayesian classifier suggested that patients with higher Mini-Mental State Examination score and lower caudate SBR asymmetry were more likely to develop parkinsonism, while patients with the opposite pattern were more likely to develop dementia. This study shows that iRBD patients older than 70 with constipation and reduced nigro-putaminal dopaminergic function are at high risk of short-term phenoconversion to an overt synucleinopathy, providing an effective stratification approach for future neuroprotective trials. Moreover, we provide cut-off values for the significant predictors of phenoconversion to be used in single subjects.</description><subject>Aged</subject><subject>Caudate Nucleus - diagnostic imaging</subject><subject>Caudate Nucleus - metabolism</subject><subject>Dopamine Plasma Membrane Transport Proteins - metabolism</subject><subject>Engineering Sciences</subject><subject>Female</subject><subject>Humans</subject><subject>Kaplan-Meier Estimate</subject><subject>Male</subject><subject>Middle Aged</subject><subject>Original</subject><subject>Putamen - diagnostic imaging</subject><subject>Putamen - metabolism</subject><subject>REM Sleep Behavior Disorder - diagnostic imaging</subject><subject>REM Sleep Behavior Disorder - metabolism</subject><subject>Retrospective Studies</subject><subject>ROC Curve</subject><subject>Synucleinopathies - diagnostic imaging</subject><subject>Synucleinopathies - metabolism</subject><subject>Tomography, Emission-Computed, Single-Photon</subject><subject>Tropanes</subject><issn>0006-8950</issn><issn>1460-2156</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpdkU1vEzEQhi0EomnhyBX5CIel_lzvXpCqtrRIQUgIzmbWHidGG3uxkyD-PRsSKuA00viZ1zN6CHnB2RvOenk5FIjpEn4AyFY_IguuWtYIrtvHZMEYa5uu1-yMnNf6jTGupGifkjMppepkKxfk602eYBMTllV0NG5gFdOKQvLUjTFFByOdCvrotrlUGnKh0xpTdjntsdSYE82Bfrr9QOuIONEB17CPeVeojzUXj-UZeRJgrPj8VC_Il3e3n6_vm-XHu_fXV8vGKcG385ZCGjBoDOeDcJ0RCoIIiBqUN8p3KvShNejlYHwfVM9V5zQ3g2wHGOZyQd4ec6fdsEHvMG0LjHYq803lp80Q7b8vKa7tKu9tp_u-52IOeH0MWP83dn-1tIcek7pTrGN7PrOvTp-V_H2HdWs3sTocR0iYd9UKZcRsR-sD2hxRV3KtBcNDNmf2YND-NmhPBmf-5d93PNB_lMlfgYSbIQ</recordid><startdate>20210212</startdate><enddate>20210212</enddate><creator>Arnaldi, Dario</creator><creator>Chincarini, Andrea</creator><creator>Hu, Michele T</creator><creator>Sonka, Karel</creator><creator>Boeve, Bradley</creator><creator>Miyamoto, Tomoyuki</creator><creator>Puligheddu, Monica</creator><creator>De Cock, Valérie Cochen</creator><creator>Terzaghi, Michele</creator><creator>Plazzi, Giuseppe</creator><creator>Tachibana, Naoko</creator><creator>Morbelli, Silvia</creator><creator>Rolinski, Michal</creator><creator>Dusek, Petr</creator><creator>Lowe, Val</creator><creator>Miyamoto, Masayuki</creator><creator>Figorilli, Michela</creator><creator>Verbizier, Delphine de</creator><creator>Bossert, Irene</creator><creator>Antelmi, Elena</creator><creator>Meli, Riccardo</creator><creator>Barber, Thomas R</creator><creator>Trnka, Jiří</creator><creator>Miyagawa, Toji</creator><creator>Serra, Alessandra</creator><creator>Pizza, Fabio</creator><creator>Bauckneht, Matteo</creator><creator>Bradley, Kevin M</creator><creator>Zogala, David</creator><creator>McGowan, Daniel R</creator><creator>Jordan, Lennon</creator><creator>Manni, Raffaele</creator><creator>Nobili, Flavio</creator><general>Oxford University Press</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>1XC</scope><scope>5PM</scope><orcidid>https://orcid.org/0000-0003-3372-1667</orcidid><orcidid>https://orcid.org/0000-0001-5773-9656</orcidid><orcidid>https://orcid.org/0000-0003-4850-9677</orcidid><orcidid>https://orcid.org/0000-0002-1937-9116</orcidid><orcidid>https://orcid.org/0000-0001-6937-3065</orcidid><orcidid>https://orcid.org/0000-0002-1638-1384</orcidid><orcidid>https://orcid.org/0000-0001-9811-0897</orcidid><orcidid>https://orcid.org/0000-0002-6837-6608</orcidid><orcidid>https://orcid.org/0000-0003-1739-6139</orcidid></search><sort><creationdate>20210212</creationdate><title>Dopaminergic imaging and clinical predictors for phenoconversion of REM sleep behaviour disorder</title><author>Arnaldi, Dario ; Chincarini, Andrea ; Hu, Michele T ; Sonka, Karel ; Boeve, Bradley ; Miyamoto, Tomoyuki ; Puligheddu, Monica ; De Cock, Valérie Cochen ; Terzaghi, Michele ; Plazzi, Giuseppe ; Tachibana, Naoko ; Morbelli, Silvia ; Rolinski, Michal ; Dusek, Petr ; Lowe, Val ; Miyamoto, Masayuki ; Figorilli, Michela ; Verbizier, Delphine de ; Bossert, Irene ; Antelmi, Elena ; Meli, Riccardo ; Barber, Thomas R ; Trnka, Jiří ; Miyagawa, Toji ; Serra, Alessandra ; Pizza, Fabio ; Bauckneht, Matteo ; Bradley, Kevin M ; Zogala, David ; McGowan, Daniel R ; Jordan, Lennon ; Manni, Raffaele ; Nobili, Flavio</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c421t-89237a7e7711b2c8724af2fee5a4d74d84f9f67ed3b7d9f49148c517b36bab7b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Aged</topic><topic>Caudate Nucleus - 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Academic</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>Brain (London, England : 1878)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Arnaldi, Dario</au><au>Chincarini, Andrea</au><au>Hu, Michele T</au><au>Sonka, Karel</au><au>Boeve, Bradley</au><au>Miyamoto, Tomoyuki</au><au>Puligheddu, Monica</au><au>De Cock, Valérie Cochen</au><au>Terzaghi, Michele</au><au>Plazzi, Giuseppe</au><au>Tachibana, Naoko</au><au>Morbelli, Silvia</au><au>Rolinski, Michal</au><au>Dusek, Petr</au><au>Lowe, Val</au><au>Miyamoto, Masayuki</au><au>Figorilli, Michela</au><au>Verbizier, Delphine de</au><au>Bossert, Irene</au><au>Antelmi, Elena</au><au>Meli, Riccardo</au><au>Barber, Thomas R</au><au>Trnka, Jiří</au><au>Miyagawa, Toji</au><au>Serra, Alessandra</au><au>Pizza, Fabio</au><au>Bauckneht, Matteo</au><au>Bradley, Kevin M</au><au>Zogala, David</au><au>McGowan, Daniel R</au><au>Jordan, Lennon</au><au>Manni, Raffaele</au><au>Nobili, Flavio</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Dopaminergic imaging and clinical predictors for phenoconversion of REM sleep behaviour disorder</atitle><jtitle>Brain (London, England : 1878)</jtitle><addtitle>Brain</addtitle><date>2021-02-12</date><risdate>2021</risdate><volume>144</volume><issue>1</issue><spage>278</spage><epage>287</epage><pages>278-287</pages><issn>0006-8950</issn><eissn>1460-2156</eissn><abstract>This is an international multicentre study aimed at evaluating the combined value of dopaminergic neuroimaging and clinical features in predicting future phenoconversion of idiopathic REM sleep behaviour (iRBD) subjects to overt synucleinopathy. Nine centres sent 123I-FP-CIT-SPECT data of 344 iRBD patients and 256 controls for centralized analysis. 123I-FP-CIT-SPECT images were semiquantified using DaTQUANTTM, obtaining putamen and caudate specific to non-displaceable binding ratios (SBRs). The following clinical variables were also analysed: (i) Movement Disorder Society-sponsored revision of the Unified Parkinson's Disease Rating Scale, motor section score; (ii) Mini-Mental State Examination score; (iii) constipation; and (iv) hyposmia. Kaplan-Meier survival analysis was performed to estimate conversion risk. Hazard ratios for each variable were calculated with Cox regression. A generalized logistic regression model was applied to identify the best combination of risk factors. Bayesian classifier was used to identify the baseline features predicting phenoconversion to parkinsonism or dementia. After quality check of the data, 263 iRBD patients (67.6 ± 7.3 years, 229 males) and 243 control subjects (67.2 ± 10.1 years, 110 males) were analysed. Fifty-two (20%) patients developed a synucleinopathy after average follow-up of 2 years. The best combination of risk factors was putamen dopaminergic dysfunction of the most affected hemisphere on imaging, defined as the lower value between either putamina (P &lt; 0.000001), constipation, (P &lt; 0.000001) and age over 70 years (P = 0.0002). Combined features obtained from the generalized logistic regression achieved a hazard ratio of 5.71 (95% confidence interval 2.85-11.43). Bayesian classifier suggested that patients with higher Mini-Mental State Examination score and lower caudate SBR asymmetry were more likely to develop parkinsonism, while patients with the opposite pattern were more likely to develop dementia. This study shows that iRBD patients older than 70 with constipation and reduced nigro-putaminal dopaminergic function are at high risk of short-term phenoconversion to an overt synucleinopathy, providing an effective stratification approach for future neuroprotective trials. Moreover, we provide cut-off values for the significant predictors of phenoconversion to be used in single subjects.</abstract><cop>England</cop><pub>Oxford University Press</pub><pmid>33348363</pmid><doi>10.1093/brain/awaa365</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0003-3372-1667</orcidid><orcidid>https://orcid.org/0000-0001-5773-9656</orcidid><orcidid>https://orcid.org/0000-0003-4850-9677</orcidid><orcidid>https://orcid.org/0000-0002-1937-9116</orcidid><orcidid>https://orcid.org/0000-0001-6937-3065</orcidid><orcidid>https://orcid.org/0000-0002-1638-1384</orcidid><orcidid>https://orcid.org/0000-0001-9811-0897</orcidid><orcidid>https://orcid.org/0000-0002-6837-6608</orcidid><orcidid>https://orcid.org/0000-0003-1739-6139</orcidid><oa>free_for_read</oa></addata></record>
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identifier ISSN: 0006-8950
ispartof Brain (London, England : 1878), 2021-02, Vol.144 (1), p.278-287
issn 0006-8950
1460-2156
language eng
recordid cdi_pubmedcentral_primary_oai_pubmedcentral_nih_gov_8599912
source MEDLINE; Oxford University Press Journals All Titles (1996-Current); EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection
subjects Aged
Caudate Nucleus - diagnostic imaging
Caudate Nucleus - metabolism
Dopamine Plasma Membrane Transport Proteins - metabolism
Engineering Sciences
Female
Humans
Kaplan-Meier Estimate
Male
Middle Aged
Original
Putamen - diagnostic imaging
Putamen - metabolism
REM Sleep Behavior Disorder - diagnostic imaging
REM Sleep Behavior Disorder - metabolism
Retrospective Studies
ROC Curve
Synucleinopathies - diagnostic imaging
Synucleinopathies - metabolism
Tomography, Emission-Computed, Single-Photon
Tropanes
title Dopaminergic imaging and clinical predictors for phenoconversion of REM sleep behaviour disorder
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