Shin-Ichi Wada

Osaka City University, Ōsaka, Ōsaka, Japan

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Publications (3)4.29 Total impact

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    ABSTRACT: Abstract Conclusion: The midline electroneurography (ENoG) method might reflect total facial nerve degeneration. Objective: We compared ENoG values in patients with facial palsy using two different methods, the midline method and five electroneurogram recordings, to reveal whether the ENoG value obtained with the midline method reflects total facial nerve degeneration. Methods: Forty patients with facial palsy were enrolled. Compound muscle action potentials (CMAPs) were recorded using the midline method, in which the anode was placed on the mental protuberance and the cathode was placed on the philtrum. Additionally, five electroneurogram recordings were obtained by placing the anode on the skin of the parietal region and five cathodes on the skin over five facial muscles (frontalis, orbicularis oculi, nasalis, orbicularis oris, and depressor anguli oris muscles). ENoG values recorded using the two methods were compared. Results: The ENoG values of the five facial muscles did not differ from those obtained using the midline method. The total ENoG value calculated by summing five CMAPs from five facial muscles, which is considered to reflect total facial nerve degeneration, was not significantly different from that using midline methods; moreover, a strong positive correlation coefficient (r = 0.87) was found between them.
    Acta oto-laryngologica 11/2012; DOI:10.3109/00016489.2012.743680 · 0.99 Impact Factor
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    ABSTRACT: The novel midline electroneurography (ENoG) method may have advantages over the standard method in terms of ease of electrode setting, and the ENoG value may be a useful prognostic factor. We compared ENoG performed in patients with facial palsy using two different methods--the new midline method and standard method--in terms of the amplitudes of the compound muscle action potentials(CMAPs) and relationship between the ENoG value and clinical course. A total of 64 patients with facial palsy were enrolled. CMAPs were recorded using the midline method, in which the recording electrodes were placed on the mental protuberance and philtrum over the orbicularis oris muscle, and the standard method, in which the recording electrodes were set close to the nasolabial fold. Percutaneous electrical stimulation was applied to the main trunk of the facial nerve.The amplitudes of the CMAPs and the relationship between the ENoG value and the period to full recovery from the facial palsy were compared. The midline method had larger CMAP amplitudes on both sides and a stronger negative correlation in the relationship between the ENoG value and period to full recovery from palsy than the standard method statistically.
    Acta oto-laryngologica 09/2009; 130(4):520-4. DOI:10.1080/00016480903161558 · 0.99 Impact Factor
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    ABSTRACT: To establish a simple, reproducible procedure for studying facial motor nerve conduction (MNC), we determined the optimal electrode position to record evoked compound muscle action potentials (CMAPs) from perioral muscles in normal subjects. We examined three new electrode positions in which the electrode connected to the one input of the amplifier was placed on the mental protuberance, and the one connected to the other input was placed on the skin over the orbicularis oris muscle (the philtrum, mouth angle, or lower lip). We then compared the morphology and amplitudes of the CMAPs, right-left differences, and the reproducibility of CMAP amplitudes with recordings taken from the standard electrode position in which one electrode was placed on the nasolabial fold closely lateral to the ala nasi, and the other was placed on the skin over the orbicularis oris. Percutaneous supramaximal electrical stimulation was applied to the main trunk of the facial nerve. All three of the new recording positions showed greater amplitudes and more obvious biphasic CMAPs than the standard method. Positioning the electrode connected to the negative input on the philtrum was optimal in terms of right-left differences and the reproducibility of CMAP amplitudes. Therefore, this midline recording is a simple, reproducible method for calculating the CMAP amplitude ratio. However, prior to clinical use of this procedure, analyses of patients with facial palsy are required.
    Muscle & Nerve 06/2008; 37(6):764-9. DOI:10.1002/mus.21034 · 2.31 Impact Factor

Publication Stats

8 Citations
4.29 Total Impact Points

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Institutions

  • 2012
    • Osaka City University
      Ōsaka, Ōsaka, Japan
  • 2008–2009
    • Osaka Medical College
      • • Department of Clinical Pathology and Laboratory Medicine
      • • Department of Otolaryngology
      Takatuki, Ōsaka, Japan