TY - JOUR
T1 - Effects of low frequency filtering on distal compound muscle action potential duration for diagnosis of CIDP
T2 - A Japanese-European multicenter prospective study
AU - The Tokyo Metropolitan Neuromuscular Electrodiagnosis Study Group
AU - Mitsuma, Satsuki
AU - Van den Bergh, Peter
AU - Rajabally, Yusuf A.
AU - Van Parijs, Vinciane
AU - Martin-Lamb, Darren
AU - Sonoo, Masahiro
AU - Inaba, Akira
AU - Shimizu, Toshio
AU - Isose, Sagiri
AU - Sato, Yasunori
AU - Komori, Tetsuo
AU - Misawa, Sonoko
AU - Kuwabara, Satoshi
AU - Kuwabara, S.
AU - Isose, S.
AU - Misawa, S.
AU - Sekiguchi, Y.
AU - Shibuya, K.
AU - Sonoo, M.
AU - Shimizu, T.
AU - Komori, T.
AU - Abe, T.
AU - Inaba, A.
AU - Yokota, T.
AU - Kanouchi, T.
AU - Kokubun, N.
AU - Nagashima, T.
AU - Tamura, A.
AU - Ohishi, C.
AU - Hirashima, F.
N1 - Funding Information:
This work was supported in part by the Health and Labour Sciences Research Grant on Intractable Diseases (Neuroimmunological Diseases) from the Ministry of Health, Labour and Welfare of Japan (S.K., M.S.). Conflict of interest: None declared.
Publisher Copyright:
© 2014 International Federation of Clinical Neurophysiology.
PY - 2015/9/1
Y1 - 2015/9/1
N2 - Objective: The duration of the distal compound muscle action potential (DCMAP) is a useful index to detect demyelination in the distal nerve segments. However in published electrodiagnostic criteria for chronic inflammatory demyelinating polyneuropathy (CIDP), the cut-off values of DCMAP duration are defined using an EMG low frequency filter of only 20. Hz. We aimed to provide widely-available reference data using several low cut filters. Methods: In 13 Japanese and European tertiary centers, DCMAP duration data using 2, 5, 10, and 20. Hz low frequency filters were prospectively collected from 147 normal controls, 59 patients with typical CIDP, and 100 with diabetic polyneuropathy. Optimal cut-off values were calculated with receiver-operating characteristic curves, offering 100% specificity versus normal controls. Results: The higher low frequency filter was associated with significantly shorter DCMAP duration in all groups. For CIDP diagnosis, the calculated cut-off values had a sensitivity ranging from 51% to 66%, and a specificity versus diabetic neuropathy from 96% to 98%. Conclusions: Our results show that DCMAP duration is largely dependent on low frequency filter settings, but is a useful index for CIDP diagnosis when the cut-off values are properly determined at each filter setting. Significance: Our data provide the systematic reference values of DCMAP duration for CIDP diagnosis available for most EMG laboratories.
AB - Objective: The duration of the distal compound muscle action potential (DCMAP) is a useful index to detect demyelination in the distal nerve segments. However in published electrodiagnostic criteria for chronic inflammatory demyelinating polyneuropathy (CIDP), the cut-off values of DCMAP duration are defined using an EMG low frequency filter of only 20. Hz. We aimed to provide widely-available reference data using several low cut filters. Methods: In 13 Japanese and European tertiary centers, DCMAP duration data using 2, 5, 10, and 20. Hz low frequency filters were prospectively collected from 147 normal controls, 59 patients with typical CIDP, and 100 with diabetic polyneuropathy. Optimal cut-off values were calculated with receiver-operating characteristic curves, offering 100% specificity versus normal controls. Results: The higher low frequency filter was associated with significantly shorter DCMAP duration in all groups. For CIDP diagnosis, the calculated cut-off values had a sensitivity ranging from 51% to 66%, and a specificity versus diabetic neuropathy from 96% to 98%. Conclusions: Our results show that DCMAP duration is largely dependent on low frequency filter settings, but is a useful index for CIDP diagnosis when the cut-off values are properly determined at each filter setting. Significance: Our data provide the systematic reference values of DCMAP duration for CIDP diagnosis available for most EMG laboratories.
KW - CIDP
KW - Chronic inflammatory demyelinating polyneuropathy
KW - Demyelination
KW - Distal compound muscle action potential duration
KW - Electrodiagnosis
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U2 - 10.1016/j.clinph.2014.11.027
DO - 10.1016/j.clinph.2014.11.027
M3 - Article
C2 - 25591830
AN - SCOPUS:84938949452
VL - 126
SP - 1805
EP - 1810
JO - Electroencephalography and Clinical Neurophysiology - Electromyography and Motor Control
JF - Electroencephalography and Clinical Neurophysiology - Electromyography and Motor Control
SN - 1388-2457
IS - 9
ER -