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  • Title: Electrical impedance myography in Duchenne muscular dystrophy and healthy controls: A multicenter study of reliability and validity.
    Author: Zaidman CM, Wang LL, Connolly AM, Florence J, Wong BL, Parsons JA, Apkon S, Goyal N, Williams E, Escolar D, Rutkove SB, Bohorquez JL, DART-EIM Clinical Evaluators Consortium.
    Journal: Muscle Nerve; 2015 Oct; 52(4):592-7. PubMed ID: 25702806.
    Abstract:
    INTRODUCTION: Electrical impedance myography (EIM) is a non-invasive, painless, objective technique to quantify muscle pathology. METHODS: We measured EIM in 8 arm and leg muscles in 61 boys with Duchenne muscular dystrophy (DMD) and 31 healthy boys, ages 3-12 years, at 5 centers. We determined the reliability of EIM and compared results in boys with DMD to controls and to 6-minute walk distance (6MWD), North Star Ambulatory Assessment (NSAA), timed functional tests (TFTs), and strength (hand-held dynamometry). RESULTS: EIM was well tolerated and had good inter- and intrarater reliability (intraclass correlation coefficient 0.81-0.96). The averaged EIM phase value from all muscles was higher (P < 0.001) in controls (10.45 ± 2.29) than boys with DMD (7.31 ± 2.23), and correlated (P ≤ 0.001) with 6MWD (r = 0.55), NSAA (r = 0.66), TFTs (r = -0.56), and strength (r = 0.44). CONCLUSION: EIM is a reliable and valid measure of disease severity in DMD. Longitudinal studies comparing EIM with other assessments over time in DMD are warranted.
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