Abstract
Background: This study was undertaken to evaluate the diagnostic sensitivity of several muscles in repetitive nerve stimulation test (RNST) for myasthenia gravis (MG) patients. Materials and Methods: The study population consisted of 39 MG patients classified by modified Ossermann's classification. Using Stalberg's method, RNST was systematically performed in facial (orbicularis oculi and nasalis) and upper extremity (flexor carpi ulnaris, abductor digiti quinti and anconeus) muscles. Results: The significant electrodecremental response of RNST were noted in orbicularis oculi(58.9%), nasalis (51.3%), flexor carpi ulnaris(42%), anconeus(41%) and abductor digiti quinti muscles(27%). Among the 3 muscles of upper extremity(abductor digiti quinti, flexor carpi ulnaris and anconeus), the positive electrodecremental response of anconeus muscles was significantly higher than other two muscles(p
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