Jitter Values on Voluntary Active Periocular Muscles of Healthy Subjects with Conventional (37 mm) Concentric Needle Electrode.
Noro Psikiyatr Ars
; 53(2): 126-129, 2016 Jun.
Article
em En
| MEDLINE
| ID: mdl-28360784
ABSTRACT
INTRODUCTION:
The aim of this study was to re-evaluate jitter values of healthy subjects in whom pairs of single-fiber-like potentials were recorded from voluntary activated periocular muscles using a disposable 37-mm concentric needle electrode (CNE) with 2-kHz low-cut filtering.METHODS:
We reviewed the recordings of 129 subjects (85 women; 44 men; mean age, 43.8±15.3 years). The m. frontalis group included 116 subjects, and the m. orbicularis oculi group included 18 subjects. Jitter values were expressed as the mean consecutive difference (MCD) of 20 different pairs.RESULTS:
The mean MCD (n=2680) was 22.5±9.7 µs (range, 5-121 µs), and the upper 95% confidence limit (CL) was 39 µs. The mean of 134 MCD values for each subject was 22.5±3.7 µs (range, 15-33 µs), and the upper 95% CL was 30 µs. The outer limit of the 18th highest MCD values out of 20 recordings for each subject was 31.3±6.5 µs (range, 18-53 µs), with an upper 95% CL of 43.3 µs.CONCLUSION:
Using a conventional 37-mm CNE with 2-kHz low-cut filtering may be a cost effective alternative to a single-fiber electrode in periocular muscles if strict criteria are used for acceptable signals. Jitter values of >44 µs that were calculated from single-fiber-like action potential pairs should alert the physician regarding the possibility of neuromuscular junction disorders and constitute an indication for a further diagnostic investigation.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article