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Inicio Neurología (English Edition) 123I-MIBG Myocardial Scintigraphy in the Diagnosis of Lewy Body Dementia
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Vol. 25. Issue 7.
Pages 414-421 (January 2010)
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Vol. 25. Issue 7.
Pages 414-421 (January 2010)
Original article
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123I-MIBG Myocardial Scintigraphy in the Diagnosis of Lewy Body Dementia
Gammagrafía miocárdica con 123I-MIBG en el diagnóstico de la demencia con cuerpos de Lewy
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M. Marquié Sayaguésa,
Corresponding author
martamarquie@hotmail.com

Corresponding author.
, L. Da Silva Alvesa, L. Molina-Porcela, D. Alcolea Rodrígueza, I. Sala Mataveraa, M.B. Sánchez-Saudinósa, V. Camacho Martíb, M. Estorch Cabrerab, R. Blesa Gonzáleza,c, T. Gómez-Islaa,c, A. Lleó Bisaa,c
a Unidad de Memoria, Servicio de Neurología, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
b Servicio de Medicina Nuclear, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
c Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Universitat Autònoma de Barcelona, Barcelona, Spain
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Abstract
Introduction

Lewy body dementia (LBD) is the second most common cause of neurodegenerative dementia after Alzheimer's disease (AD). A cardiac post-ganglionic sympathetic denervation has been described in this condition which can be quantified by MIBG (metaiodobenzylguanidine) myocardial scintigraphy. The aim of our work was to retrospectively evaluate cardiac MIBG uptake (expressed as the heart-to-mediastinum ratio at 4h (HMR) in patients with suspected LBD, and to examine its relationship with clinical and para-clinical data.

Material and methods

A total of 77 patients with clinical suspicion of LBD evaluated at our centre between September 2005 and June 2008 to whom a MIBG myocardial scintigraphy has been performed were retrospectively reviewed. International Consensus Criteria of LBD were applied to divide the sample into probable LBD, possible LBD and non-LBD. HMR values and their relationships with clinical and neuropsychological data were analyzed. A subgroup of patients had FP-CIT (fluoropropyl-carbomethoxy-3β-4-iodophenyltropane) SPECTas a part of the evaluation.

Results

Mean HMR values were significantly lower in probable LBD group than in possible LBD and non-LBD groups. Low HMR values were associated only with reduced FP-CIT uptake in the striatum, but not with any clinical or neuropsychological item.

Conclusions

Low MIBG myocardial scintigraphy uptake is a robust measure in LBD, and it is not largely affected by medical conditions, or by the stage of the disease. In LBD reduced MIBG myocardial uptake is associated with nigrostriatal degeneration.

Keywords:
Lewy body dementia
International Consensus Criteria of LBD
Myocardial sympathetic denervation
MIBG myocardial scintigraphy
Heart-to-mediastinum ratio
Resumen
Introducción

La demencia con cuerpos de Lewy (DCLw) es la segunda causa más frecuente de demencia degenerativa tras la demencia tipo Alzheimer (DTA). En esta entidad se ha descrito una denervación simpática cardíaca posganglionar, que puede cuantificarse mediante la gammagrafía miocárdica con MIBG (metayodobencilguanidina). El objetivo de nuestro trabajo fue evaluar retrospectivamente la captación miocárdica de MIBG, expresada cuantitativamente como el índice corazón/mediastino a las 4h (ICM) en pacientes con sospecha clínica de DCLw, y examinar su relación con los datos clínicos y paraclínicos.

Pacientes y métodos

Se revisaron retrospectivamente datos de 77 pacientes con sospecha clínica de DCLw evaluados entre septiembre de 2005 y junio de 2008 en nuestro hospital a los que se les había realizado una gammagrafía miocárdica con MIBG. Se aplicaron los criterios internacionales de consenso para dividir la muestra en DCLw probable, DCLw posible y sin DCLw. Se analizaron el ICM en cada grupo y su relación con variables clínicas y neuropsicológicas. A un subgrupo de pacientes se le había realizado además un SPECT con FP-CIT (fluoropropil-carbometoxi-3β-4-yodofeniltropano) como parte de la evaluación.

Resultados

Los valores medios de ICM fueron significativamente menores en el grupo de DCLw probable que en los grupos de DCLw posible y sin DCLw. Valores disminuidos de ICM solamente se asociaron a una captación disminuida en el estriado en el FP-CITSPECT, pero no a ninguna variable clínica ni neuropsicológica.

Conclusiones

La captación miocárdica reducida de MIBG es una medida robusta en la DCLw, y no se ve afectada por condiciones médicas o el estadio de la enfermedad. Una disminución en la captación miocárdica de MIBG se asocia a la degeneración nigroestriada en la DCLw.

Palabras clave:
Demencia con cuerpos de Lewy
Criterios internacionales de consenso de DCLw
Denervación simpática miocárdica
Gammagrafía miocárdica con MIBG
Índice corazón/mediastino a las 4h
FP-CITSPECT
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