Electrophysiological and Clinical Examination of Polymyositis: A Retrospective Analysis

Yang, Fei; Jin, Feng; Chen, Zhaohui; Li, Ling; Wang, Rongfei; Wang, Xiangqing; Tin, Chenlin; Chen, Pu; Shi, Xuejiao; Huo, Yun; Zhang, Xiaolan; Huang, Xusheng; Yu, Shengyuan

doi:10.1097/maj.0000000000000216

Cited by 6 publications

(6 citation statements)

References 20 publications

(28 reference statements)

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Section: Discussionmentioning

confidence: 99%

“…However, the positive correlation might indicate that a lower ADC value reflects the same disease state as a small MUAP. Furthermore, a recent study indicated that the decrease in the duration is more sensitive than the decrease in the amplitude in polymyositis patients (Yang et al, 2014). Based upon the presented data, we hypothesize that a smaller ADC value might indicate a more severe course of myositis F I G U R E 2 Spearman Correlation analysis identified a positive correlation between ADC mean and the duration of the MUAP, p = .78 P = .0279 and between ADC min and the duration of the MUAP p = .85 P = .01 TA B L E 4 Muscles divided into groups with pathological spontaneous activity and physiological behavior.…”

Section: Ta B L E 3 Correlations Between Dwi and Emg Parameters In Almentioning

confidence: 99%

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Associations between apparent diffusion coefficient and electromyography parameters in myositis—A preliminary study

Meyer¹,

Emmer

Kornhuber

et al. 2018

Brain and Behavior

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Objective MRI is widely used in several muscle disorders. Diffusion‐weighted imaging (DWI) is an emergent imaging modality sensitive to microstructural alterations in tissue. The apparent diffusion coefficient (ADC) is used to quantify the random motion of water molecules. Electromyography (EMG) is a clinically used diagnostic tool in myositis. The aim of this study was to elucidate possible associations between ADC values and EMG findings in myositis patients.MethodSeven patients (eight investigated muscles) with myositis (mean age 51.43 ± 19 years) were included in this study. The diagnosis was confirmed by histopathology in every case. DWI was obtained with a 1.5‐T scanner using two b‐values 0 and 1000 s/mm². In all patients, a needle electromyography (EMG) was performed within 3 days to the MRI. The following EMG parameters were studied: motor unit action potential (MUAP) amplitudes and durations, as well as pathological spontaneous activity. Spearman's correlation coefficient was used to analyze associations between investigated parameters.ResultsThe estimated mean ADC mean value was 1.51 ± 0.29 × 10−3 mm²/s, mean ADC min was 1.28 ± 0.27 × 10−3 mm²/s, and mean ADC max was 1.73 ± 0.28 × 10−3 mm²/s. Correlation analysis identified significant associations between ADC mean and duration of the MUAP (p = .78 P = .0279) and between ADC min and duration of the MUAP (p = .85, P = .01). There were no significant differences according to pathological spontaneous activity.Conclusion ADC mean and ADC min showed strong positive correlations with the duration of the MUAP in myositis patients. Both modalities might similarly reflect muscle fiber loss in myositis patients.

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Section: Discussionmentioning

confidence: 99%

Section: Ta B L E 3 Correlations Between Dwi and Emg Parameters In Almentioning

confidence: 99%

Associations between apparent diffusion coefficient and electromyography parameters in myositis—A preliminary study

Meyer¹,

Emmer

Kornhuber

et al. 2018

Brain and Behavior

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“…Furthermore, a recent study indicated that MUP duration decrease may be more sensitive than MUP amplitude decrease in polymyositis patients, which corrobarates the clinical relevance of the reported results 24,25 . Only one other study investigated associations between clinical MRI and EMG 17 .…”

Section: Discussionmentioning

confidence: 97%

Associations between magnetic resonance imaging and EMG findings in myopathies

Meyer¹,

Schneider

Emmer

et al. 2020

Acta Neurol Scand

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“…Studies have demonstrated variable accuracy of electroneuromyography in different SAM, at similar rates in DM compared to PM (B) [28], and the evaluation of muscle fiber conduction velocity did not help to discriminate SAM from other myopathies (B) [29,30].…”

Section: Literature Review and Analysismentioning

confidence: 99%

The Brazilian Society of Rheumatology recommendations on investigation and diagnosis of systemic autoimmune myopathies

et al. 2019

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Background: This research is recommended by the Myopathy Committee of the Brazilian Society of Rheumatology for the investigation and diagnosis of systemic autoimmune myopathies. Body: A systematic literature review was performed in the Embase, Medline (PubMed) and Cochrane databases, including studies published until October 2018. PRISMA was used for the review, and the articles were evaluated, based on the Oxford levels of evidence. Ten recommendations were developed addressing different aspects of systemic autoimmune myopathy investigation and diagnosis. Conclusions: The European League Against Rheumatism/ American College of Rheumatology (EULAR/ACR) classification stands out for the diagnosis of systemic autoimmune myopathies. Muscular biopsy is essential, aided by muscular magnetic resonance images and electroneuromyography in complementary research. Analysis of the factors related to prognosis with the evaluation of extramuscular manifestations, and comorbidities and intense investigation regarding differential diagnoses are mandatory.

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Electrophysiological and Clinical Examination of Polymyositis: A Retrospective Analysis

Cited by 6 publications

References 20 publications

Associations between apparent diffusion coefficient and electromyography parameters in myositis—A preliminary study

Associations between apparent diffusion coefficient and electromyography parameters in myositis—A preliminary study

Associations between magnetic resonance imaging and EMG findings in myopathies

The Brazilian Society of Rheumatology recommendations on investigation and diagnosis of systemic autoimmune myopathies

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