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Whole-Body Muscle MRI in Patients with Hyperkalemic Periodic Paralysis Carrying the SCN4A Mutation T704M: Evidence for Chronic Progressive Myopathy with Selective Muscle Involvement
Article em En | WPRIM | ID: wpr-188621
Biblioteca responsável: WPRO
ABSTRACT
BACKGROUND AND PURPOSE: Hyperkalemic periodic paralysis (hyperKPP) is a muscle sodium-ion channelopathy characterized by recurrent paralytic attacks. A proportion of affected individuals develop fixed or chronic progressive weakness that results in significant disability. However, little is known about the pathology of hyperKPP-induced fixed weakness, including the pattern of muscle involvement. The aim of this study was to characterize the patterns of muscle involvement in hyperKPP by whole-body magnetic resonance imaging (MRI). METHODS: We performed whole-body muscle MRI in seven hyperKPP patients carrying the T704M mutation in the SCN4A skeletal sodium-channel gene. Muscle fat infiltration, suggestive of chronic progressive myopathy, was analyzed qualitatively using a grading system and was quantified by the two-point Dixon technique. RESULTS: Whole-body muscle MRI analysis revealed muscle atrophy and fatty infiltration in hyperKPP patients, especially in older individuals. Muscle involvement followed a selective pattern, primarily affecting the posterior compartment of the lower leg and anterior thigh muscles. The muscle fat fraction increased with patient age in the anterior thigh (r=0.669, p=0.009), in the deep posterior compartment of the lower leg (r=0.617, p=0.019), and in the superficial posterior compartment of the lower leg (r=0.777, p=0.001). CONCLUSIONS: Our whole-body muscle MRI findings provide evidence for chronic progressive myopathy in hyperKPP patients. The reported data suggest that a selective pattern of muscle involvement-affecting the posterior compartment of the lower leg and the anterior thigh-is characteristic of chronic progressive myopathy in hyperKPP.
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Texto completo: 1 Índice: WPRIM Assunto principal: Patologia / Coxa da Perna / Imageamento por Ressonância Magnética / Atrofia Muscular / Paralisia Periódica Hiperpotassêmica / Canalopatias / Perna (Membro) / Músculos / Doenças Musculares Limite: Humans Idioma: En Revista: Journal of Clinical Neurology Ano de publicação: 2015 Tipo de documento: Article
Texto completo: 1 Índice: WPRIM Assunto principal: Patologia / Coxa da Perna / Imageamento por Ressonância Magnética / Atrofia Muscular / Paralisia Periódica Hiperpotassêmica / Canalopatias / Perna (Membro) / Músculos / Doenças Musculares Limite: Humans Idioma: En Revista: Journal of Clinical Neurology Ano de publicação: 2015 Tipo de documento: Article