Shigetoshi Yoda

Transient evoked otoacoustic emissions in newborn infants: Effects of ear asymmetry, gender, and age.

Our aim was to examine the effects of gender, ear asymmetry, and age of infants on various parameters of transient evoked otoacoustic emissions (TEOAEs). Three hundred thirty-two infants (181 males, 151 females) were tested using the ILO292 Otodynamics Analyzer (Otodynamics Ltd, England) as a screening procedure. The subjects were divided into two age groups: group 1, newborn infants prior to hospital discharge (mean age of 4 days), and group 2, infants at the 1-month-old health checkup (mean age of 35 days). Responses to TEOAE stimuli were recorded at 1.0, 1.5, 2.0, 3.0, and 4.0 kHz. There were significant effects of gender and ear (left/right) on the signal-to-noise ratio, response level, and whole-wave and band reproducibility values in TEOAEs. The right ear had higher values of whole-wave reproducibility, response level, signal-to-noise ratio, and band reproducibility than the left ear. Females displayed higher whole-wave reproducibility, response level, band reproducibility, and signal-to-noise ratio values than males. There was no significant difference in response level, signal-to-noise ratio, and band reproducibility between the two age groups. The findings of the present investigation may contribute toward future improvements in neonatal hearing screening based on the community.

Blockage of longitudinal flow in Meniere's disease: A human temporal bone study

Abstract Conclusion: Blockage of the endolymphatic duct is a significant finding in Menieres disease. The position of the utriculo-endolymphatic valve (UEV) and blockage of the ductus reuniens in the temporal bones were not found to be directly indicative of Menieres disease. Objective: Comparison of blockage of the longitudinal flow of endolymph between ears affected by Menieres disease and normal ears. Methods: We examined 21 temporal bones from 13 subjects who had Menieres disease and 21 normal temporal bones from 12 controls. Results: The endolymphatic duct was blocked in five (23%) ears affected by Menieres disease (p = 0.016). The utricular duct was blocked in 16 (76%) ears affected by Menieres disease and 11 (52%) normal ears (p = 0.112). The saccular duct was blocked in 6 (28%) of ears affected by Menieres disease and 16 (76%) normal ears (p = 0.001). The ductus reuniens was blocked in 10 (47%) ears affected by Menieres disease and 10 (47%) normal ears (p = 1.000).

Pulmonary carcinoma metastasis to the internal auditory canal.

Pulmonary adenocarcinoma, which accounts for 35.3% of pulmonary carcinoma, causes brain metastases up to 28% in clinical setting (1, 2). Leptomeningeal carcinomatosis occurs in approximately 0.7% of lung cancer patients (3). The patterns for spread of secondary temporal bone malignancies could be summarized as: isolated metastasis, diffuse metastatic leptomeningeal carcinomatosis, and direct extension. In this study, a case of metastatic tumor of the internal auditory canal from leptomeningeal carcinomatosis of pulmonary adenocarcinoma will be reported.

Endoscopic Transseptal Approach to Frontal Sinus Disease

This paper describes an endoscopic transseptal approach to identify and access the frontal sinus and reviews the clinical cases. Between May 2004 and July 2010, endoscopic modified Lothrop procedure (EMLP) with transseptal approach was performed on sixteen patients. The indications for EMLP were complicated frontal sinusitis or cyst, revision surgery for failed frontal sinusotomy or Lynch procedure, or trauma cases. The first step of this procedure was to open a window in the bilateral anterior portion of the middle turbinates and nasal septum. The nasal septum, which could be observed through the window, should be the landmark of the midline during the surgery. A drill bur was raised up just behind the nasal bone along the midline of the nose. After the bilateral frontal sinuses and their posterior walls were confirmed, the interfrontal septum was removed superiorly. We reviewed the clinical records of patients who underwent the EMLP with transseptal approach. We have managed sixteen patients in this fashion. Neither intracranial nor orbital complications were encountered during or after surgery. Endoscopic transseptal frontal sinus surgery is simple to perform, and does not cause severe complications.