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Serial Stimulated Jitter Analysis In Juvenile Myasthenia Gravis
Author(s) -
Bhatia Shivani,
Quinlan Haley,
McCracken Courtney,
Price Eric W.,
Guglani Lokesh,
Verma Sumit
Publication year - 2018
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.26319
Subject(s) - myasthenia gravis , jitter , juvenile , medicine , neuromuscular junction , electrodiagnosis , neuroscience , psychology , biology , computer science , telecommunications , genetics
: Clinical and electrophysiological studies to measures disease activity in juvenile myasthenia gravis (JMG) are limited. Methods : Retrospective review of the clinical profile, Myasthenia Gravis Foundation of America (MGFA) scores, serial stimulated jitter analysis (Stim‐JA) of the orbicularis oculi muscle, grip strength, and spirometry of patients with JMG who were followed in a multidisciplinary clinic was performed. Results : Thirteen patients with JMG (9 females) with mean age of 13.2 ± 4.8 years and follow‐up duration of 25.3 ± 8.3 months (range, 6–39) with ≥ 2 Stim‐JA recordings were included. The mean jitter, mean percentage of apparent single‐fiber action potentials (%ASFAP) with increased jitter, and mean %ASFAP with blocking at baseline values (77.3 ± 54.7 µs, 64.3% ± 35.8%, 39% ± 38.6%, respectively) and at follow‐up (53 ± 45.4 µs, 51.2% ± 34.5%, 17% ± 29.4%, respectively) were abnormal; however, no statistically significant interval difference was noted. The electrophysiological data correlated significantly with Myasthenia Gravis Foundation of America (MGFA) class. Grip strength and spirometry did not correlate with MGFA class. Discussion : Stimulated jitter values are sensitive biomarkers in JMG. Muscle Nerve 58 : 729–732, 2018