Reducing sample size requirements for future ALS clinical trials with a dedicated electrical impedance myography system.

Reducing sample size requirements for future ALS clinical trials with a dedicated electrical impedance myography system.
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DOI:
10.1080/21678421.2018.1510008
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发表时间:
2018-11
影响因子:
2.8
通讯作者:
Bohorquez JL
Bohorquez JL
中科院分区:
医学4区
文献类型:
--
作者:
Shefner JM;Rutkove SB;Caress JB;Benatar M;David WS;Cartwright MS;Macklin EA;Bohorquez JL

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在这项纵向多中心队列研究中,我们评估了专用电阻抗肌电图 (EIM) 设备评估 ALS 进展的潜力以及该系统的基本可重复性和诊断准确性。 46 名 ALS 患者使用 mView EIM 设备 (Myolex, Inc) 在 8 个月的时间内以 2 个月的间隔对多个肌肉进行了多达 5 次连续测量。还获得了疾病状态的标准测量值。对 30 名健康志愿者和 30 名 ALS 模拟者进行了一次评估,以确定该技术是否有助于初步诊断。评估了多个电极阵列和 EIM 结果。 EIM 追踪 ALS 进展情况;功率分析表明,通过利用来自每个受试者 EIM 下降最大的肌肉的 50 kHz 相位值,与 ALSFRS-R 相比,样本量要求减少了 5.2 倍。该进展率与 ALSFRS-R 总进展相关,R=0.371,p=0.021。重复性很高,单个肌肉的组内和组间相关系数大多大于 0.90。 ALS 患者和健康对照之间的平均 50 kHz 相位有区别(曲线下面积 0.78,95% 置信区间 (CI) 0.68,0.89),但模拟者和 ALS 患者之间没有区别(曲线下面积 0.60,95% CI 0.47,0.73)。虽然识别 ALS 与疾病模拟的特异性有限,但这些结果支持这样的假设:单肌 EIM 可以在 ALS 临床试验中作为一种方便、可重复且强大的结果测量方法。
In this longitudinal multicenter cohort study, we evaluated the potential of a dedicated electrical impedance myography (EIM) device to assess ALS progression and the system’s basic reproducibility and diagnostic accuracy. Forty-six ALS patients underwent up to 5 sequential measurements of multiple muscles over a period of 8 months at 2-month intervals using the mView EIM device (Myolex, Inc). Standard measures of disease status were also obtained. A group of 30 healthy volunteers and 30 ALS-mimics were evaluated once to determine if the technique could assist with initial diagnosis. Several electrode arrays and EIM outcomes were assessed. EIM tracked ALS progression; power analyses suggested a 5.2-fold reduction in sample size requirements compared to ALSFRS-R by utilizing 50 kHz phase value from the muscle with the greatest EIM decline in each subject. This progression rate correlated to total ALSFRS-R progression, with R=0.371, p=0.021. Reproducibility was high, with both intra- and inter-rater intraclass correlation coefficients for individual muscles mostly greater than 0.90. The mean 50 kHz phase distinguished between ALS patients and healthy controls (area-under-curve 0.78, 95% confidence intervals (CIs) 0.68,0.89), but not between mimics and ALS patients (area-under-curve 0.60, 95% CIs 0.47,0.73). While limited in its specificity to identify ALS versus disease mimics, these results support the hypothesis that single-muscle EIM can serve as a convenient, repeatable, and powerful outcome measure in ALS clinical trials.
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发表时间: 2012-01-01
期刊: MUSCLE & NERVE
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DOI: 10.3109/17482968.2012.688837
发表时间: 2012-09
期刊: Amyotrophic lateral sclerosis : official publication of the World Federation of Neurology Research Group on Motor Neuron Diseases
影响因子: --
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