Auditory evoked blink reflex and posterior auricular muscle response: Observations in patients with HFS and PFS |
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| Authors: | Meral E. Kızıltan Ayşegül Gündüz Rahşan Şahin |
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| Affiliation: | 1. Institute of Computer and Communication Engineering, National Cheng Kung University, Taiwan;2. Department of Computer Science and Information Engineering, National Dong Hwa University, Taiwan;3. Department of Electrical Engineering, National Cheng Kung University, Taiwan;1. Department of Neurology and Memory Research and Resources Center, Gui de Chauliac University Hospital, Montpellier, France;2. INSERM U 1061—Neuropsychiatry: Epidemiological and Clinical Research, Montpellier, France;3. Institut d''Imagerie Fonctionnelle Humaine, I2FH, Gui de Chauliac University Hospital, Montpellier, France;4. Department of Neuroradiology, Gui de Chauliac University Hospital, Montpellier, France;5. Team “Plasticity of Central Nervous System, Stem Cells and Glial Tumors,” Institut National de la Santé et de la Recherche Médicale Unité 583, Institut of Neurosciences of Montpellier, Saint Eloi Hospital, Montpellier, France;6. INSERM U 1198 — Molecular Mechanisms in Neurodegenerative Diseases, Montpellier, France;7. Department of Nuclear Medicine, Gui de Chauliac University Hospital, Montpellier, France;8. CHRU de Montpellier, Université de Montpellier, Institute of Regenerative Medicine and Bio-therapy (IRMB), INSERM U1183, CCBHM, Laboratoire de Biochimie Protéomique Clinique, Montpellier, France;1. Department of Otolaryngology Head and Neck Surgery, Korea University College of Medicine, South Korea;2. Department of Otolaryngology Head and Neck Surgery, Hallym University College of Medicine, South Korea |
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| Abstract: | Our goal was to investigate the characteristics of the auditory brainstem reflexes in patients with hemifacial spasm (HFS) and postparalytic facial syndrome (PFS).The spasm activities and responses by supraorbital and auditory stimuli were recorded from the orbicularis oculi, the posterior auricular and the mentalis muscles in 27 HFS and 21 PFS patients. The results were compared with those of 20 controls.Blink reflex (BR) was obtained by supraorbital stimulation in normal controls and on both sides of HFS and PFS patients whereas sound evoked bilateral auditory blink reflex (ABR) in 96.3%, 90.5% and 100%, respectively. Both BR and ABR showed synkinetic spread on symptomatic sides in all patients. The posterior auricular muscle response (PAMR) was observed bilaterally in 59.3%, 42.9% and 75.0% of groups, respectively. However, there was no synkinetic spread of PAMR.Since PAMR does not show synkinetic spread even in the presence of synkinetic spread of ABR and BR, we may suggest that a distal origin may be responsible of the synkinetic spread, or PAM is probably governed by a smaller nucleus in the brainstem. Thus it may be speculated that its excitability is insufficient to stimulate the ABR nucleus, whereas the reverse process is possible. |
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