P-2-07-03
VESTIBULOCOLLIC REFLEX EVOKED BY ACOUSTIC STIMULATION
Ju Kang Lee, M.D. (Dept. of Rehab. Medicine, Ewha Womans University, Seoul, Korea)
Purpose: The aim of this study was to measure the vestibulocollic reflex which is essential for maintaining balance and posture.
Method: Vestibulocollic reflex evoked by acoustic stimulation was measured by the averaged surface myoelectric signal of the sternocleidomastoid muscles of 24 healthy volunteer. The sound stimulation (0.1 msec, 95 dB, 5 Hz click) through headphone was given to the ears bilaterally and the electromyography were recorded from surface electrode over the sternocleidomastoid muscles and averaged simultaneously.
Results: Five peaks were appeared. The P1 potential latency was 11.33±0.97 msec, N1 19.67±2.64 msec, P2 25.91±3.26 msec, N2 31.38±3.39 msec and P3 40.44±3.64 msec. The P1N1 pontential amplitude was 45.26±20.82 μV and N1P2 potential amplitude was 26.42±16.34 μN. The P1 and N1 potentials were present in all subject, but P2, N2 and P3 potentials were present in most but not all subject.
Conclusion: The acoustic stimulation induced vestibulocollic reflex was measured. These normative data can be used for evaluation of the vestibulocollic reflex pathway.
P-2-07-04
THE CONCORDANCE BETWEEN REFERRAL DIAGNOSIS AND ELECTROPHYSIOLOGICAL DIAGNOSIS IN ELECTRONEUROMYOGRAPHIC STUDIES
Betul Turan, Gulseren Akyuz, 0nder Us, Eren Gozke, Onder Kayhan
Marmara University Institute of Neurological Sciences, Department of Clinical Neurophysiology, Istanbul, Turkey
Electroneuromyography (ENMG), is one of the most widely used examination methods in diagnosing, localizing and determining the severity of peripheral nerve diseases. The result of electrophysiological study may support the referral diagnosis or may even implicate a different diagnosis. In this study, the concordance between referral diagnosis and ENMG diagnosis was investigated. The ENMG results of 506 patients who were examined between May 1995 and January 1996, were reviewed retrospectively. ENMG studies were normal in 205 (40.5%) and abnormal in 301 (59.5%). The most frequent ENMG diagnosis among the abnormal results was carpal tunnel syndrome (100 patients-33.2%), followed by polyneuropathy (47-15.6%), lumbosacral radiculopathy (44-14.6%), facial paralysis (25-8.3%), cervical radiculopathy (16-5.3%) and others (69-23%) respectively. Of the 301 patients with an abnormal electrophysiological study, 37 (7.3%) had a final ENMG diagnosis different from the referral diagnosis, where 264 (52.2%) had similar diagnosis.
As a result; normal electrophysiological findings in 40% of the patients examined findings leading to diagnosis in 7% may in fact influence treatment strategy significantly.
