Electrodiagnostic testing of nerves and muscles: when, why, and how to order.

Chémali, Kamal R.; Tsao, Bryan E.

doi:10.3949/ccjm.72.1.37

Cited by 34 publications

(21 citation statements)

References 13 publications

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“…28,29 If diagnostic uncertainty exists after history, examination and imaging, somatosensory-evoked potential examination can show the presence of neuronal dysfunction. 30 In patients with the acute development of symptoms suggestive of CM, as in the case presented here, it is important to consider vascular disorder such as spinal cord arteriovenous malformation as well as nonmyelopathy acute disorders such as Guillain-Barré syndrome or shoulder amyotrophy. 31 This case is interesting because the patient was scheduled to receive conservative treatment that included cervical manipulation, but just before receiving treatment, his condition progressed to CM.…”

Section: Discussionmentioning

confidence: 94%

Cervical Myelopathy: A Case Report of a “Near-Miss” Complication to Cervical Manipulation

Murphy¹,

Beres²

2008

Journal of Manipulative and Physiological Therapeutics

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Section: Discussionmentioning

confidence: 94%

Cervical Myelopathy: A Case Report of a “Near-Miss” Complication to Cervical Manipulation

Murphy¹,

Beres²

2008

Journal of Manipulative and Physiological Therapeutics

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“…Furthermore, timing is of significance in the usefulness of the electrodiagnostic examinations. Moreover, needle electrode examination requires patient cooperation [10]. On the other hand, structural abnormalities in MRI do not necessarily imply the underlying cause of the presenting clinical symptoms [11].…”

Section: Introductionmentioning

confidence: 99%

A comparison of magnetic resonance imaging with electrodiagnostic findings in the evaluation of clinical radiculopathy: a cross-sectional study

2014

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Purpose The aim of this study was to evaluate the agreement of magnetic resonance imaging and electrodiagnostic studies by comparing their findings in patients with clinically suspected radiculopathy. The agreements between these two procedures and clinical findings were also examined. Methods In a 2-year cross-sectional study, a total of 114 patients with clinically suspected cervical or lumbosacral radiculopathy were included. Results The total agreements between clinical with MRI and EDX findings were 72 and 52 %, respectively while their agreements were similar in group definite (89 vs. 82 %). The agreement between EDX and MRI was 59.6 in total and 49 % with respect to clinical findings. Conclusion This study further supports that these two methods are complementary in general. It is reasonable to add EDX when there is discrepancy between MRI and clinical findings or when MRI neurologic findings are not visible.

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“…Comprehensive knowledge of the basic principles of cellular excitability (1,20,27) is fundamental to the education of medical students, because the measurement of neuronal excitability and signal conduction represents an essential part of electrodiagnostic testing in clinical practice (6). In addition, it is important to understand the principles of electrical excitability in nerve and muscle cells for the appropriate use of stimulation devices like deep brain electrodes, cardiac pacemakers, and defibrillators (16,22,23).…”

Section: Introductionmentioning

confidence: 99%

Easy method to examine single nerve fiber excitability and conduction parameters using intact nonanesthetized earthworms

Bähring

Bauer

2014

Advances in Physiology Education

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The generation and conduction of neuronal action potentials (APs) were the subjects of a cell physiology exercise for first-year medical students. In this activity, students demonstrated the all-or-none nature of AP generation, measured conduction velocity, and examined the dependence of the threshold stimulus amplitude on stimulus duration. For this purpose, they used the median giant nerve fiber (MGF) in the ventral nerve cord of the common earthworm (Lumbricus terrestris). Here, we introduce a specialized stimulation and recording chamber that the nonanesthetized earthworm enters completely unforced. The worm resides in a narrow round duct with silver electrodes on the bottom such that individual APs of the MGF can be elicited and recorded superficially. Our experimental setup combines several advantages: it allows noninvasive single fiber AP measurements taken from a nonanesthetized animal that is yet restrained. Students performed the experiments with a high success rate. According to the data acquired by the students, the mean conduction velocity of the MGF was 30.2 m/s. From the amplitude-duration relationship for threshold stimulation, rheobase and chronaxie were graphically determined by the students according to Lapicque's method. The mean rheobase was 1.01 V, and the mean chronaxie was 0.06 ms. The acquired data and analysis results are of high quality, as deduced from critical examination based on the law of Weiss. In addition, we provide video material, which was also used in the practical course.

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Electrodiagnostic testing of nerves and muscles: when, why, and how to order.

Abstract: The electrodiagnostic examination can provide essential information in cases of suspected peripheral nervous system disorders or injury. To optimize the yield of this test, one must have a basic understanding of how it works, when and how to order it, and its inherent limitations.

Cited by 34 publications

References 13 publications

Cervical Myelopathy: A Case Report of a “Near-Miss” Complication to Cervical Manipulation

Cervical Myelopathy: A Case Report of a “Near-Miss” Complication to Cervical Manipulation

A comparison of magnetic resonance imaging with electrodiagnostic findings in the evaluation of clinical radiculopathy: a cross-sectional study

Easy method to examine single nerve fiber excitability and conduction parameters using intact nonanesthetized earthworms

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