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  • Title: Electrical impedance myography in the diagnosis of radiculopathy.
    Author: Spieker AJ, Narayanaswami P, Fleming L, Keel JC, Muzin SC, Rutkove SB.
    Journal: Muscle Nerve; 2013 Nov; 48(5):800-5. PubMed ID: 23483460.
    Abstract:
    INTRODUCTION: We sought to determine whether electrical impedance myography (EIM) could serve as a diagnostic procedure for evaluation of radiculopathy. METHODS: Twenty-seven patients with clinically and radiologically diagnosed cervical or lumbosacral radiculopathy who met a "gold standard" definition underwent EIM and standard needle electromyography (EMG) of multiple upper or lower extremity muscles. RESULTS: EIM reactance values revealed consistent reductions in the radiculopathy-affected myotomal muscles as compared with those on the unaffected side; the degree of asymmetry was associated strongly with the degree of EMG abnormality (P < 0.001). EIM had a sensitivity of 64.5% and a specificity of 77.0%; in comparison, EMG had a sensitivity of 79.7% but a specificity of 69.7%. CONCLUSIONS: These findings support the potential for EIM to serve as a new non-invasive tool to assist in diagnosis of radiculopathy; however, further refinement of the technique is needed for this specific application.
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