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Muscle Nerve. 2013 Nov;48(5):800-5. doi: 10.1002/mus.23833. Epub 2013 Sep 11.

Electrical impedance myography in the diagnosis of radiculopathy.

Author information

1
Department of Neurology, Beth Israel Deaconness Medical Center, 330 Brookline Avenue, Boston, Massachusetts, 02215, USA.

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.

KEYWORDS:

cervical radiculopathy; electrical impedance; electromyography; lumbosacral radiculopathy; muscle; reactance

PMID:
23483460
DOI:
10.1002/mus.23833
[Indexed for MEDLINE]

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