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
中科院分区:
文献类型:
--
作者:
Shefner JM;Rutkove SB;Caress JB;Benatar M;David WS;Cartwright MS;Macklin EA;Bohorquez JL
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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影响因子:
3.4
作者:
Andres, Patricia L.;Skerry, Linda M.;Cudkowicz, Merit E.
通讯作者:
Cudkowicz, Merit E.
影响因子:
4.4
作者:
Cedarbaum, JM;Stambler, N;Nakanishi, A
通讯作者:
Nakanishi, A
影响因子:
3.7
作者:
Li, Jia;Sung, Minhee;Rutkove, Seward B.
通讯作者:
Rutkove, Seward B.
影响因子:
3.4
作者:
Rutkove, Seward B.
通讯作者:
Rutkove, Seward B.
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:
--
作者:
Rutkove SB;Caress JB;Cartwright MS;Burns TM;Warder J;David WS;Goyal N;Maragakis NJ;Clawson L;Benatar M;Usher S;Sharma KR;Gautam S;Narayanaswami P;Raynor EM;Watson ML;Shefner JM
通讯作者:
Shefner JM