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https://www.readbyqxmd.com/read/27759891/does-change-in-neuromuscular-jitter-predict-or-correlate-with-clinical-change-in-mg
#1
Donald B Sanders, Janice M Massey
OBJECTIVE: To determine if single-fiber EMG (SFEMG) jitter accurately reflects change in severity in myasthenia gravis (MG). METHODS: We reviewed jitter and outcome data from all MG patients in our clinic who had at least 2 jitter measurements in the extensor digitorum (ED) or frontalis muscle. RESULTS: Change in all parameters of jitter measured with SFEMG electrodes predicted clinical change with acceptable accuracy. Absolute and percentage change in mean MCD were equally accurate in predicting clinical change and were more accurate than change in the proportion of fiber pairs with blocking or normal jitter...
October 19, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/27749461/diagnostic-accuracy-of-single-fiber-electromyography-for-myasthenia-gravis-in-patients-followed-longitudinally
#2
John A Morren, Kerry H Levin, Robert W Shields
INTRODUCTION: The literature lacks data on accuracy of single fiber electromyography (SFEMG) for myasthenia gravis (MG) patients followed longitudinally. METHODS: We included patients with a clinical suspicion of MG who received SFEMG and follow-up at our institution between 2003 and 2013. Data collected included demographics, symptom details, clinical deficits, other diagnostic testing results, MG medication regimen, duration on treatment, response to therapy, and ultimate diagnosis after follow-up...
October 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27648598/diagnostic-accuracy-of-single-fiber-emg-for-myasthenia-gravis-in-patients-followed-longitudinally
#3
John A Morren, Kerry H Levin, Robert W Shields
INTRODUCTION: The literature lacks data on accuracy of single fiber electromyography (SFEMG) for myasthenia gravis (MG) patients followed longitudinally. METHODS: We included patients with a clinical suspicion of MG who received SFEMG and follow-up at our institution between 2003-2013. Data collected included demographics, symptom details, clinical deficits, other diagnostic testing results, MG medication regimen, duration on treatment, response to therapy and ultimate diagnosis after follow-up...
March 31, 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/27611986/neuromuscular-transmission-abnormalities-in-myotonic-dystrophy-type-1-a-neurophysiological-study
#4
Francesco Bombelli, Ludovico Lispi, Sandro Costanzi Porrini, Manlio Giacanelli, Chiara Terracciano, Roberto Massa, Antonio Petrucci
OBJECTIVES: Weakness and fatigue are frequent symptoms in myotonic dystrophy type 1 (DM1), mainly as a result of muscle impairment. However, neuromuscular junction (NMJ) abnormalities could play an additional role in determining these manifestations. We aimed to document the possible NMJ involvement in DM1. PATIENTS AND METHODS: In order to substantiate this hypothesis we performed low rate repetitive nerve stimulation (RNS) and single fiber electromyography (SFEMG), in 14 DM1 subjects...
November 2016: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/27144873/single-fiber-emg-as-a-prognostic-tool-in-myasthenia-gravis
#5
Mateja Baruca, Lea Leonardis, Simon Podnar, Tanja Hojs-Fabjan, Anton Grad, Aleš Jerin, Rok Blagus, Saša Šega-Jazbec
INTRODUCTION: Single fiber electromyography (SFEMG) is the most sensitive diagnostic tool for diagnosis of myasthenia gravis (MG). Its prognostic value is not known. METHODS: We retrospectively analyzed the clinical course of 232 MG patients who presented with only mild symptoms and had SFEMG of the orbicularis oculi muscle. We correlated their SFEMG results with the severity of their later clinical course. RESULTS: During the observation period 39 patients (17%) developed severe disease exacerbations, and 193 (83%) remained stable...
December 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/27098787/quantitating-changes-in-jitter-and-spike-number-using-concentric-needle-electrodes-in-amyotrophic-lateral-sclerosis-patients
#6
Ming-Sheng Liu, Jing-Wen Niu, Yi Li, Yu-Zhou Guan, Li-Ying Cui
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 unit instability and denervation in neurogenic diseases. The aim of this study was to determine whether quantitative changes in jitter and spike number using CN electrodes could be used for ALS studies...
May 5, 2016: Chinese Medical Journal
https://www.readbyqxmd.com/read/26923566/neurotoxicity-in-russell-s-viper-daboia-russelii-envenoming-in-sri-lanka-a-clinical-and-neurophysiological-study
#7
Anjana Silva, Kalana Maduwage, Michael Sedgwick, Senaka Pilapitiya, Prasanna Weerawansa, Niroshana J Dahanayaka, Nicholas A Buckley, Sisira Siribaddana, Geoffrey K Isbister
CONTEXT: Russell's viper is more medically important than any other Asian snake, due to number of envenoming's and fatalities. Russell's viper populations in South India and Sri Lanka (Daboia russelii) cause unique neuromuscular paralysis not seen in other Russell's vipers. OBJECTIVE: To investigate the time course and severity of neuromuscular dysfunction in definite Russell's viper bites, including antivenom response. METHODOLOGY: We prospectively enrolled all patients (>16 years) presenting with Russell's viper bites over 14 months...
June 2016: Clinical Toxicology
https://www.readbyqxmd.com/read/26829229/neuromuscular-effects-of-common-krait-bungarus-caeruleus-envenoming-in-sri-lanka
#8
Anjana Silva, Kalana Maduwage, Michael Sedgwick, Senaka Pilapitiya, Prasanna Weerawansa, Niroshana J Dahanayaka, Nicholas A Buckley, Christopher Johnston, Sisira Siribaddana, Geoffrey K Isbister
OBJECTIVE: We aimed to investigate neurophysiological and clinical effects of common krait envenoming, including the time course and treatment response. METHODOLOGY: Patients with definite common krait (Bungarus caeruleus) bites were recruited from a Sri Lankan hospital. All patients had serial neurological examinations and stimulated concentric needle single-fibre electromyography (sfEMG) of orbicularis oculi in hospital at 6 wk and 6-9 mth post-bite. PRINCIPAL FINDINGS: There were 33 patients enrolled (median age 35 y; 24 males)...
February 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/26770586/determination-of-the-normative-values-of-the-masseter-muscle-by-single-fiber-electromyography-in-myasthenia-gravis-patients
#9
Lei Shi, Heng-Fang Liu, Min Zhang, Ya-Pei Guo, Bo Song, Chang-Dong Song, Dan-Dan Song, Yu-Ming Xu
The purpose of this study is to obtain normative values of the masseter muscle of myasthenia gravis (MG) patients and healthy volunteers by single-fiber electromyography (SFEMG). Stimulation of SFEMG in the masseter muscle was studied in 15 healthy volunteers (men 8, women 7; mean age 40.2, range 21-77) and 30 patients affected by MG (men 16, women 14; mean age 42.8, range 12-75). The mean consecutive difference (MCD) of the individual fiber and the mean MCD per study were determined in the normal group. We recommend the upper normal limit for the individual fibers of jitter and the mean MCD per study in the healthy Chinese adults of 33 µs and 22 µs respectively...
2015: International Journal of Clinical and Experimental Medicine
https://www.readbyqxmd.com/read/26481746/single-fiber-electromyography-in-the-extensor-digitorum-communis-for-the-predictive-prognosis-of-ocular-myasthenia-gravis-a-retrospective-study-of-102-cases
#10
Yu-Zhou Guan, Li-Ying Cui, Ming-Sheng Liu, Jing-Wen Niu
BACKGROUND: Single-fiber electromyography (SFEMG) abnormality in the extensor digitorum communis (EDC) was reported in ocular myasthenia gravis (OMG), which indicated subclinical involvement beyond extraocular muscles in OMG patients. The relationship between the abnormal findings of SFEMG in EDC and the probability for OMG to develop generalized myasthenia gravis (GMG) is unknown. This retrospective study aimed to determine the predictive value of abnormality of SFEMG in EDC of OMG patients...
October 20, 2015: Chinese Medical Journal
https://www.readbyqxmd.com/read/26109387/repetitive-nerve-stimulation-and-single-fiber-electromyography-in-the-evaluation-of-patients-with-suspected-myasthenia-gravis-or-lambert-eaton-myasthenic-syndrome-review-of-recent-literature
#11
REVIEW
Faye Y Chiou-Tan, James M Gilchrist
INTRODUCTION: Our aim in this study was to provide an updated literature review of electrodiagnostic testing in myasthenia gravis and Lambert-Eaton myasthenic syndrome. METHODS: A systematic review of the recent literature was performed using the following key words: myasthenia gravis (MG); Lambert-Eaton myasthenic syndrome (LEMS); electromyography (EMG); repetitive nerve stimulation (RNS); single-fiber electromyography (SFEMG); nerve conduction study; and normative values...
September 2015: Muscle & Nerve
https://www.readbyqxmd.com/read/25932178/comparison-of-two-electrophysiological-methods-for-the-assessment-of-progress-in-a-rat-model-of-nerve-repair
#12
Dong Han, Jiuzhou Lu, Lei Xu, Jianguang Xu
There are 2 critical steps in neural regeneration: nerve fibres successfully crossing the suture and restoration of neuromuscular transmission. For the second step, the compound muscle action potential (CMAP) is the standard electrophysiological technique used to assess regeneration, but it is difficult to detect changes in the CMAP during early regeneration after nerve repair. There is a need for better, noninvasive quantitative electrophysiological techniques to assess regeneration in an earlier stage after nerve repair...
2015: International Journal of Clinical and Experimental Medicine
https://www.readbyqxmd.com/read/25620718/single-fiber-electromyography-analysis-of-botulinum-toxin-diffusion-in-patients-with-fatigue-and-pseudobotulism
#13
Alexis Ruet, Marie Christine Durand, Pierre Denys, Frederic Lofaso, François Genet, Alexis Schnitzler
OBJECTIVE: To characterize electromyographic abnormalities according to symptoms (asymptomatic, fatigue, pseudobotulism) reported 1 month after botulinum toxin injection. DESIGN: Retrospective, single-center study comparing single-fiber electromyography (SFEMG) in the extensor digitorum communis (EDC) or orbicularis oculi (OO) muscles. SETTING: Hospital. PARTICIPANTS: Four groups of adults treated for spasticity or neurologic bladder hyperactivity (N=55): control group (asymptomatic patients: n=17), fatigue group (unusual fatigue with no weakness: n=15), pseudobotulism group (muscle weakness and/or visual disturbance: n=20), and botulism group (from intensive care unit of the same hospital: n=3)...
June 2015: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/25440012/impairment-of-neuromuscular-transmission-in-transient-global-amnesia-does-it-really-exist
#14
Małgorzata Gaweł, Izabela Domitrz, Wojciech Domitrz, Elżbieta Szmidt-Sałkowska, Anna Kamińska
BACKGROUND: The main hypotheses regarding mechanisms of transient global amnesia (TGA) are ischemia in hippocampal structures, epileptic genesis, and migraine. In accordance with the hypothesis of a shared, common pathophysiological mechanism in both TGA and migraine, neuromuscular transmission (NMT) abnormalities previously found in migraine were also suspected in TGA. OBJECTIVE: The aim of our study was to analyze NMT in TGA patients to reveal a subclinical impairment of neuromuscular transmission as a possible indicator of underlying channelopathy, which would point to a shared etiology with migraine...
2014: Neurologia i Neurochirurgia Polska
https://www.readbyqxmd.com/read/25271685/single-fiber-electromyography-of-facial-and-limb-muscles-in-diabetic-patients-with-or-without-neuropathy
#15
Jasem Y Al-Hashel, Rossen T Rousseff, Adnan J Khuraibet, Plamen Tzvetanov
PURPOSE: In diabetic patients, single-fiber electromyography (SFEMG) is often abnormal in the limb muscles and is considered unreliable in diagnosis of synaptic disorders. We aimed to compare SFEMG abnormalities of frontalis muscle (FM) and extensor digitorum communis muscle in diabetic patients with neuropathy and without neuropathy. METHODS: Stimulation SFEMG of FM and extensor digitorum communis muscle was performed in matched groups of 30 diabetic patients with neuropathy and 20 diabetic patients without neuropathy...
October 2014: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/25047827/jitter-of-corticospinal-neurons-during-repetitive-transcranial-magnetic-stimulation-method-and-possible-clinical-implications
#16
Pietro Caliandro, Luca Padua, Alessandro Rossi, Paolo Maria Rossini, Erik Stalberg, Matteo Feurra, Monica Ulivelli, Sabina Bartalini, Fabio Giannini, Simone Rossi
BACKGROUND: Repetitive transcranial magnetic stimulation (rTMS) of the motor cortex activates corticospinal neurons mainly through the depolarization of cortico-cortical axons belonging to interneurons of superficial layers. OBJECTIVE: We used single-fiber electromyography (SFEMG) to estimate the "central jitter" of activation latency of interneural pools from one pulse of TMS to another. METHODS: We evaluated 10 healthy subjects and one patient with multiple sclerosis...
July 2014: Brain Stimulation
https://www.readbyqxmd.com/read/24822137/an-adult-patient-with-ocular-myasthenia-and-unusually-long-spontaneous-remission
#17
Jasem Al-Hashel, Hanaa M Rashad, Rossen T Rousseff
A male patient developed ocular myasthenia gravis (MG) at the age of 33. He was anti-acetylcholine receptor antibody (anti-AChR Ab) negative. He received cholinesterase blocker for 5 months and went into a complete clinical remission that lasted untreated for 17 years. He relapsed recently with ocular symptoms only. He is now anti-AChR Ab positive and SFEMG is abnormal in a facial muscle. The patient is controlled with steroids. He had one of the longest spontaneous remissions reported in the natural history of MG, particularly unusual for an adult with the disease...
2014: Case Reports in Neurological Medicine
https://www.readbyqxmd.com/read/24810970/minimal-clinically-important-difference-in-myasthenia-gravis-outcomes-from-a-randomized-trial
#18
RANDOMIZED CONTROLLED TRIAL
Hans D Katzberg, Carolina Barnett, Ingemar S J Merkies, Vera Bril
INTRODUCTION: The minimal clinically important difference (MCID) is the smallest outcome change that has clinical significance. Its use has not been established in the study of myasthenia gravis (MG). METHODS: Patients from a published intravenous immunoglobulin (IVIg) vs. placebo study were studied. One anchor-based and 3 distribution-based techniques were used to identify quantitative myasthenia gravis score (QMGS), repetitive nerve stimulation (RNS), and single-fiber electromyography (SFEMG) MCID cut-offs...
May 2014: Muscle & Nerve
https://www.readbyqxmd.com/read/24296278/reliability-of-sfemg-in-diagnosing-myasthenia-gravis-sensitivity-and-specificity-calculated-on-100-prospective-cases
#19
L Padua, P Caliandro, G Di Iasi, C Pazzaglia, F Ciaraffa, A Evoli
OBJECTIVE: The study aimed to determine the utility of single-fibre electromyography (SFEMG) in the diagnosis of myasthenia gravis (MG) in subjects with a clinical suspicion of the disease. METHODS: We performed a prospective, single-blinded study on 100 consecutive patients. SFEMG was not considered a criterion in making the MG diagnosis. For all cases, a different physician than the one performing SFEMG made the diagnosis of MG. All subjects underwent standard SFEMG of a single muscle, the orbicularis oculi...
June 2014: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/23886635/neuromuscular-transmission-in-hypoxemic-patients-with-chronic-obstructive-pulmonary-disease
#20
Gazi Gulbas, Yuksel Kaplan, Ozden Kamisli, Hilal Ermis, Suat Kamisli, Cemal Ozcan
Many studies have focused on the systemic effects of chronic obstructive pulmonary disease (COPD), but none has examined neuromuscular junction transmission (NMT). We evaluated NMT dysfunction using single-fiber electromyography (SFEMG) in patients with COPD. Twenty patients with COPD and 20 age-matched healthy controls were included in the study. All patients and controls underwent SFEMG. Abnormal NMT was found in seven of 20 patients (35%), but in none of the control subjects. The COPD patients were subgrouped according to the presence of hypoxemia...
October 1, 2013: Respiratory Physiology & Neurobiology
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