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. 2020 May;61(5):644-649.
doi: 10.1002/mus.26792. Epub 2020 Jan 22.

Magnetic resonance imaging correlates with electrical impedance myography in facioscapulohumeral muscular dystrophy

Johanna Hamel  1 , Phil Lee  2   3 , Melanie D Glenn  4 , Tekalign Burka  4 , In-Young Choi  3   4 , Seth D Friedman  5 , Dennis W W Shaw  5 , Ayla McCalley  4 , Laura Herbelin  4 , Mazen M Dimachkie  4 , Richard Lemmers  6 , Silvère M van der Maarel  6 , Richard J Barohn  4 , Rabi Tawil  1 , Jeffrey M Statland  4
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Magnetic resonance imaging correlates with electrical impedance myography in facioscapulohumeral muscular dystrophy

Johanna Hamel et al. Muscle Nerve. 2020 May.

Abstract

Introduction: Electrical impedance myography (EIM) has been proposed as a noninvasive biomarker of muscle composition in facioscapulohumeral muscular dystrophy (FSHD). Here we determine the associations of EIM variables with muscle structure measured by MRI.

Methods: We evaluated 20 patients with FSHD at two centers, comparing EIM measurements (resistance, reactance, and phase at 50, 100, and 211 kHZ) recorded from bilateral vastus lateralis, tibialis anterior, and medial gastrocnemius muscles to MRI skin and subcutaneous fat thickness, MRI T1-based muscle severity score (T1 muscle score), and MRI quantitative intramuscular Dixon fat fraction (FF).

Results: While reactance and phase both correlated with FF and T1 muscle score, 50 kHz reactance was most sensitive to muscle structure alterations measured by both T1 score (ρ = -0.71, P < .001) and FF (ρ = -0.74, P < .001).

Discussion: This study establishes the correlation of EIM with structural MRI features in FSHD and supports further evaluation of EIM as a potential biomarker in FSHD clinical trials.

Keywords: facioscapulohumeral muscular dystrophy; genetics; muscle disease; natural history studies; neuromuscular disease; outcome measures.

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REFERENCES

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