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Published in: Journal of Neurology 5/2019

01-05-2019 | Muscular Dystrophy | Original Communication

Relationship between muscle inflammation and fat replacement assessed by MRI in facioscapulohumeral muscular dystrophy

Authors: Julia R. Dahlqvist, Grete Andersen, Tahmina Khawajazada, Christoffer Vissing, Carsten Thomsen, John Vissing

Published in: Journal of Neurology | Issue 5/2019

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Abstract

Objective

Unlike most muscular dystrophies that progress symmetrically at a constant rate, facioscapulohumeral muscular dystrophy (FSHD) is characterized by stepwise, asymmetric progression of muscle wasting, and weakness. Muscle tissue is progressively replaced by fat; however, its relation to preceding inflammation is unclear. In this longitudinal study of FSHD, we assessed muscle inflammation and fat replacement and their relation quantitatively. We also investigated whether fat replacement in muscle varies along its length.

Methods

Forty-five patients with FSHD were evaluated twice, 14 months apart. Using MRI sequences with short TI inversion recovery (STIR), we quantified the degree of STIR hyperintensity in muscles (≥ 2 SD above control intensity). STIR hyperintensities (STIR+) suggest edema or inflammation. We used Dixon MRI to quantify fat content.

Results

Of 370 thigh muscles, 83 were STIR+ at baseline and 103 at follow-up. The highest frequency of STIR+ was seen in muscles with inter-mediate fat content (40–60% fat). The progression of fat replacement was higher in STIR+ muscles (5.0 ± 4.0%) vs. STIR− muscles [2.3 ± 3.3% (P < 0.0001)]. In addition, muscles with severe STIR+ at baseline had a higher fat replacement progression than muscles with milder STIR+ (R = 0.39, P = 0.001). The fat content was higher in the distal part vs. proximal part of most muscles (P < 0.05). However, the progression of the fat replacement was uniform along the length of all the muscles.

Conclusion

Muscles with STIR+, indicating inflammation, have a faster progression of fat replacement than STIR− muscles, and the fat replacement progression correlated with the severity of STIR+.
Literature
Metadata
Title
Relationship between muscle inflammation and fat replacement assessed by MRI in facioscapulohumeral muscular dystrophy
Authors
Julia R. Dahlqvist
Grete Andersen
Tahmina Khawajazada
Christoffer Vissing
Carsten Thomsen
John Vissing
Publication date
01-05-2019
Publisher
Springer Berlin Heidelberg
Published in
Journal of Neurology / Issue 5/2019
Print ISSN: 0340-5354
Electronic ISSN: 1432-1459
DOI
https://doi.org/10.1007/s00415-019-09242-y

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