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  • Title: Electromyographical recording of the electrically elicited stapedius reflex via a bipolar hook electrode.
    Author: Pau HW, Zehlicke T, Sievert U, Schaudel D, Behrend D, Dahl R.
    Journal: Otol Neurotol; 2009 Jan; 30(1):1-6. PubMed ID: 18833019.
    Abstract:
    OBJECTIVE: To prove the feasibility of recording stapedius reflexes by bipolar electromyography intra-operatively during cochlea implant via a bipolar hook needle electrode. STUDY DESIGN: Prospective study. SETTING: Tertiary referral center. PATIENTS: Adults receiving a MED-EL cochlear implant. INTERVENTION: Diagnostic. MAIN OUTCOME MEASURES: Stapedius reflex responses can be recorded by electromyography. RESULTS: A double hook electrode could be inserted into the muscle tissue via the natural opening of the pyramid process along with the stapedius tendon. In 7 out of 10 patients supplied with MED-EL CIs (PULSARCI100 or SONATATI100), electrically elicited stapedius reflex potentials were recorded after eliminating stimulation artifacts caused by electromagnetic fields during electrical stimulation by low pass filtering. CONCLUSION: Intraoperative stapedius reflex recording by bipolar electromyography via a hook electrode is feasible. Further research will show whether these signals may be used for establishing a self-adjusting speech processor.
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