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Diagnostic accuracy of concentric needle jitter in myasthenia: Prospective study
Flavia C.N. Machado MD1,2,*, JOÃO A. Kouyoumdjian MD, PhD3 andPaulo E. Marchiori MD, PhD1
Version of Record online: 24 NOV 2016
Muscle Nerve, 2016
The aim of this study was to estimate jitter parameters in the orbicularis oculi muscle using a concentric needle electrode (CNE) in patients with myasthenia gravis (MG) and to determine its diagnostic accuracy for jitter analysis (CNEMG-jitter).
CNEMG-jitter was performed in 20 healthy subjects and 33 MG patients using the voluntary contraction technique. Receiver operating characteristic (ROC) curves were constructed to determine cut-off points with the best sensitivity/specificity combination for jitter analysis.
CNEMG-jitter yielded high positivity rates for ocular MG (92.3%) and generalized MG (100%). The ROC curve cut-off point that provided the highest sensitivity without false positives was 24.7 μs for mean jitter and 33.1 μs for the 18th highest value. Sensitivity was 93.9% for both parameters. Diagnostic accuracy of CNEMG-jitter was > 96%.
CNEMG-jitter yielded high sensitivity and specificity rates. Our reference values were lower than previously published values, possibly due to less technical variation between the different recordings.