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Single‐institutional reference values for concentric needle jitter analysis using the extrapolated reference values procedure: Comparison to published reference values
Author(s) -
Lee Ikjae,
Sanders Donald B.,
Nandedkar Sanjeev D.,
Kazamel Mohamed
Publication year - 2021
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.27092
Subject(s) - jitter , cutoff , reference values , concentric , mathematics , cutoff frequency , statistics , physics , medicine , optics , computer science , telecommunications , geometry , quantum mechanics
Background The extrapolated reference values procedure (E‐Ref) was used to compare data from a single institution with the recently published reference value (RV) for concentric electrode jitter. Methods Data from voluntarily activated concentric needle jitter studies in the frontalis muscle were obtained using retrospective chart review. All measured signals were reviewed for acceptable quality. Cutoff values for increased jitter were calculated using E‐Ref, and compared with the published RVs. Results At total of 1501 apparent single‐fiber action potential (ASFAP) pairs were reviewed; 1371 ASFAP pairs were determined to have acceptable quality. The cutoff value identified by E‐Ref from all reviewed ASFAP pairs was 36 microseconds and the cutoff for acceptable pairs was 35 microseconds. Using either of these cutoff values (36 or 35 microseconds) did not result in a significant difference in percentage of jitter recordings considered normal when compared with the recently published RV (38 microseconds). Discussion The single‐institution jitter cutoff value obtained by E‐Ref gives results that are not significantly different from the reported RV.