Évaluation de la fatigabilité physique et de la perception de la fatigue dans la myasthénie

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Évaluation de la fatigabilité physique et de la perception de la fatigue dans la myasthénie

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Assessment of physical fatigability and fatigue perception in myasthenia gravis

Berit Jordan MD1,*, Theresa Mehl MSc1, Tabea L.K. Schweden MSc2, Uwe Menge PhD2 andStephan Zierz MD, PhD1
Version of Record online: 6 JAN 2017 DOI: 10.1002/mus.25386


ABSTRACT


  • Introduction
    Fatigue includes both performance fatigability and fatigue perception.


  • Methods
    In 32 stable patients with generalized myasthenia gravis (MG) and 17 controls, time-dependent physical performance was assessed by the arm movement test (AMT) and 6-minute walk test (6MWT). MG patients presented with low quantitative MG scores (mean 0.5, SD 0.5) and without pathologic decrement. Fatigability was based on calculation of linear trend (LT) reflecting dynamic performance within subsequent constant time intervals. Perception of physical fatigue was analyzed using fatigue questionnaires.


  • Results
    MG patients showed a negative LT in both AMT and 6MWT, significantly differing from stable performance in controls. LT inversely correlated with elevation of acetylcholine receptor antibodies (r = −0.59, P < 0.005) but not with quantitative MG score and fatigue perception.


  • Conclusions
    LT allows quantification of fatigability as an objective measurement of decline in individual performance, even in patients without obvious neuromuscular deficits in routine testing. The missing correlation of experienced fatigue supports the multidimensional fatigue model.

Muscle Nerve, 2016

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