Concentric needle jitter on stimulated frontalis and extensor digitorum in 20 myasthenia gravis patients.
نویسندگان
چکیده
INTRODUCTION Our objective was to study jitter parameters using a concentric needle electrode (CNE) in the extensor digitorum (ED) and frontalis (FR) muscles. METHODS Twenty myasthenia gravis (MG) patients, mean age 44.5 years, were studied. Percutaneous (FR) and intramuscular needle (ED) stimulation approaches were used. Jitter was expressed as the mean consecutive difference (MCD). The filter settings were from 1000 HZ to 10 kHZ. RESULTS Abnormal MCD was found in 85% for both ED and FR and in 90% when combining the two muscles. An abnormal percentage of outliers was found in 90% for ED and 85% for FR. The mean MCD did not show a difference for ED and FR, but the percentage of outliers and blocking were higher in FR. Abnormality was found in 93.7% (generalized) and in 75% (ocular) of MG cases. For ED outliers abnormality was greater than the MCD. CONCLUSION CNE jitter is reliable for investigation of MG, although borderline findings should be judged with caution.
منابع مشابه
Stimulated jitter with concentric needle in 42 myasthenia gravis patients.
OBJECTIVE To estimate jitter parameters in myasthenia gravis in stimulated frontalis and extensor digitorum muscles using the concentric needle electrode. METHODS Forty-two confirmed myasthenia gravis patients, being 22 males (aged 45.6±17.2 years-old) were studied. Jitter was expressed as the mean consecutive difference (MCD). RESULTS MCD in extensor digitorum was 61.6 µs (abnormal in 85.7...
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[1] Benatar M, Hammad M, Doss-Rinev H. Concentric-needle fiber electromyografy for the diagnosis of myasthenia gravis. Muscle Nerve 2006; 34: 163–168 [2] Bischoff C. Bedeutung der Einzelfaser-Elektromyografie für die Diagnostik neuromuskulärer Erkrankungen. Klin Neurophysiol 2000; 31: 136–143 [3] Bischoff C. Einzelfaser-EMG mit konzentrischen Nadelelektrode: eine Alternative in der Diagnositik ...
متن کاملConcentric needle single fiber electromyography: normative jitter values on voluntary activated Extensor Digitorum Communis.
Single fiber electromyography (SFEMG) is the most sensitive clinical neurophysiological test for neuromuscular junction disorders, particularly myasthenia gravis. Normal values for jitter obtained with SFEMG electrode have been published, but there are few publications for concentric needle electrode (CNE). The aim of this study was to discuss the possibilities to analyse the jitter in CNE reco...
متن کاملReference values for jitter recorded by concentric needle electrodes in healthy controls: A multicenter study.
INTRODUCTION The aim of this study was to create reference values for jitter measured with concentric needle electrodes. METHODS Operators worldwide contributed recordings from orbicularis oculi (OO), frontalis (FR), and extensor digitorum (ED) muscles in healthy controls. Criteria for acceptable signal quality were agreed upon in advance. Fifteen or 20 recordings of acceptable quality from e...
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BACKGROUND Single-fiber electromyography (SFEMG) has been suggested as a quantitative method for supporting chronic partial denervation in amyotrophic lateral sclerosis (ALS) by the revised EI Escorial criteria. Although concentric needle (CN) electrodes have been used to assess jitter in myasthenia gravis patients and healthy controls, there are few reports using CN electrodes to assess motor ...
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ورودعنوان ژورنال:
- Muscle & nerve
دوره 44 6 شماره
صفحات -
تاریخ انتشار 2011