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Identifying jitter outliers in single fiber electromyography: Comparison of four methods.

识别单纤维肌电图中的抖动异常值: 四种方法的比较。

  • 影响因子:25.02
  • DOI:10.1002/mus.27093
  • 作者列表:"Anagnostou E","Dimopoulou P","Sklavos S","Zouvelou V","Zambelis T
  • 发表时间:2021-02-01
Abstract

BACKGROUND:Little is known about how different outlier estimation methods affect cutoff limits for outliers in single fiber electromyography. METHODS:We compared in a prospective fashion the established 18th jitter value (18thjv) method to three, whole-distribution based, outlier detection methods: the interquartile range (IQR), the log-normal, and the Z-score method. The reference limits were probed in a normal cohort and in myasthenia gravis (MG) patients. RESULTS:Differences in outlier cutoff values between the different methods were in the range of 2 μs. The number of abnormal muscles according to the computed criteria was similar for all four methods in the control group. Classification metrics (sensitivity, specificity, Youden's statistic, and predictive values) were also similar among the different methods. In the MG group, however, the Z-score method failed to identify the abnormal jitter values. Accordingly, Kappa agreement was substantial to perfect (0.658 to 1) between the three methods (18thjv, IQR, and log-normal), but was equivalent to chance between the three methods and the Z-score in the MG group. CONCLUSIONS:The established 18thjv method proved largely robust when compared to whole-distribution based methods, and its use in clinical practice is justified. Simple estimation of outlier limits by adding two SDs to the mean of the data, leads to unacceptable deviations from the true cutoff values. Moreover, in a clinical scenario in which the final electrodiagnosis depends only on the number of outliers, it is meaningful to accept a tolerance zone of about 2 μs, which is the approximate variation range among the different methods.

摘要

背景: 对于不同的离群值估计方法如何影响单纤维肌电图中离群值的截止极限知之甚少。 方法: 我们以前瞻性的方式将已建立的第18个抖动值 (18thjv) 方法与三种基于全分布的异常值检测方法进行了比较: 四分位数范围 (IQR),对数正态和Z分数方法。在正常队列和重症肌无力 (MG) 患者中探测参考极限。 结果: 不同方法之间的异常值截止值的差异在2μs的范围内。根据计算标准,对照组中所有四种方法的异常肌肉数量相似。分类指标 (灵敏度,特异性,Youden统计和预测值) 在不同方法之间也相似。然而,在MG组中,Z分数方法未能识别异常抖动值。因此,三种方法 (18thjv,IQR和对数正态) 之间的Kappa一致性实质上是完美的 (0.658比1),但与MG组中三种方法和Z评分之间的偶然性相当。 结论: 与基于全分布的方法相比,已建立的18thjv方法在很大程度上被证明是稳健的,并且其在临床实践中的使用是合理的。通过将两个sd添加到数据的平均值来简单地估计异常值极限,导致与真实截止值的不可接受的偏差。此外,在最终电诊断仅取决于异常值数量的临床情况下,接受约2μs的公差范围是有意义的,这是不同方法之间的近似变化范围。

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DOI:10.1080/09273948.2019.1597896
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METHODS::Purpose: To report on ocular Vogt-Koyanagi-Harada (VKH)-like syndrome under vemurafenib treatment for metastatic melanoma.Design: A case report.Method: Description of clinical and imaging manifestations including fundus photography, fluorescein, and indocyanine green angiography.Results: A 46-year-old Thai female was diagnosed with metastatic melanoma of the skin and had been treated with multiple surgical excisions, radiotherapy, and vemurafenib (initial dose 480 mg orally twice daily, subsequently increased to maximum dose of 960 mg twice daily). After 6 months of vemurafenib use, she complained of bilateral redness and photophobia and was diagnosed with bilateral anterior uveitis, which was topically treated. Two weeks later, her visual acuity (VA) sharply deteriorated to 20/80 and counting fingers. Ocular examination at that stage stronly resembled acute VKH disease. She exhibited intraocular inflammation, and her fundus examination revealed bilateral optic disc swelling and serous retinal detachment. Fluorescein angiogram showed disc leakage and multiple pinpoint hyperfluorescence leakage spots and indocyanine green demonstrated multiple hypofluorescent spots. Oral prednisolone 30 mg/day was commenced while vemurafenib medication was ceased. Three weeks later, her vision improved, and serous retinal detachment subsided. However, her cutaneous melanoma recurred.Conclusions: Vemurafenib, a potential adjunct treatment for metastatic melanoma, was complicated by the development of panuveitis, papillitis, and multiple serous detachments. These ocular symptoms were similar to the presentation of acute VKH syndrome.

翻译标题与摘要 下载文献
影响因子:2.19
发表时间:2020-01-01
DOI:10.1111/dmcn.14268
作者列表:["Crow YJ","Shetty J","Livingston JH"]

METHODS::Comprehensive reviews of the clinical characteristics and pathogenesis of Aicardi-Goutières syndrome (AGS), particularly its contextualization within a putative type I interferonopathy framework, already exist. However, recent reports of attempts at treatment suggest that an assessment of the field from a therapeutic perspective is warranted at this time. Here, we briefly summarize the neurological phenotypes associated with mutations in the seven genes so far associated with AGS, rehearse current knowledge of the pathology as it relates to possible treatment approaches, critically appraise the potential utility of therapies, and discuss the challenges in assessing clinical efficacy. WHAT THIS PAPER ADDS: Progress in understanding AGS disease pathogenesis has led to the first attempts at targeted treatment. Further rational therapies are expected to become available in the short- to medium-term.

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影响因子:1.52
发表时间:2020-04-02
DOI:10.1080/09273948.2019.1603312
作者列表:["Takayama K","Obata H","Takeuchi M"]

METHODS::Purpose: To report the efficacy of adalimumab in a case of chronic Vogt-Koyanagi-Harada (VKH) disease refractory to conventional corticosteroids and immunosuppressive therapy and complicated by central serous chorioretinopathy (CSC).Case report: A 66-year-old woman diagnosed with VKH was treated with intravenous corticosteroids followed by oral corticosteroids and cyclosporine. However, systemic corticosteroids could not be tapered because of recurrent ocular inflammation and systemic complications (diabetes mellitus, moon face, bone weakness), while CSC appeared in both eyes. A diagnosis of chronic VKH resistant to medications complicated by corticosteroid-induced CSC was made. Systemic corticosteroids and cyclosporine were tapered and adalimumab initiated. Bilateral ocular inflammation and CSC were gradually reduced and visual acuity improved without any adverse effect. Twelve months after starting adalimumab monotherapy, no signs of active VKH and CSC were present.Conclusions: Adalimumab is one of the effective therapeutic options for refractory VKH disease complicated with corticosteroid-induced adverse effects.

神经系统自身免疫性疾病方向

神经系统自身免疫性疾病是以自身免疫细胞、免疫分子等攻击神经系统为主要致病机制的自身免疫性疾病。在免疫反应中,作用于神经系统自身抗原的致病抗体统称为神经系统自身抗体。

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