Publications by authors named "Yasuhiko Takei"

8 Publications

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Sudden sensorineural hearing loss in patients with vestibular schwannoma.

Sci Rep 2021 01 21;11(1):1624. Epub 2021 Jan 21.

Department of Otolaryngology-Head and Neck Surgery, Keio University School of Medicine, 35 Shinanomachi, Shinjuku, Tokyo, 160-8582, Japan.

Clinical features of sudden sensorineural hearing loss (SSNHL) associated with vestibular schwannoma (VS) are not fully understood. Determining a treatment plan and explaining it to patients requires clinicians to clearly understand the clinical features related to the tumor, including SSNHL. To identify the full range of clinical features of VS-associated SSNHL, especially recovery of hearing following multiple episodes of SSNHL and what factors predict recovery and recurrence. A multicenter retrospective chart review was conducted in seven tertiary care hospitals between April 1, 2011, and March 31, 2020. We collected and analyzed dose of administered steroid, pure-tone audiometry results, and brain MRIs of patients diagnosed with VS-associated SSNHL. Seventy-seven patients were included. They experienced 109 episodes of audiogram-confirmed SSNHL. The highest proportion of complete recoveries occurred in patients with U-shaped audiograms. The recovery rates for the first, second, and third and subsequent episodes of SSNHL were 53.5%, 28.0%, and 9.1%, respectively. Recovery rate decreased significantly with increasing number of SSNHL episodes (P =0 .0011; Cochran-Armitage test). After the first episode of SSNHL, the recurrence-free rate was 69.9% over 1 year and 57.7% over 2 years; the median recurrence time was 32 months. Logarithmic approximation revealed that there is a 25% probability that SSNHL would recur within a year. SSNHL in patients with VS is likely to recur within one year in 25% of cases. Also, recovery rate decreases as a patient experiences increasing episodes of SSNHL.
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http://dx.doi.org/10.1038/s41598-020-80366-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7820278PMC
January 2021

Planer orientation of the bilateral semicircular canals in dizzy patients.

Auris Nasus Larynx 2012 Oct 17;39(5):451-4. Epub 2011 Nov 17.

Department of Otolaryngology, Tokyo Women's Medical University, Medical Center East, 2-1-10 Nishiogu, Arakawa-ku, Tokyo, Japan.

Objective: Recent development of 3-dimensional analysis of eye movement enabled to detect the eye rotation axis, which is used to determine the responsible semicircular canal(s) in dizzy patients. Therefore, the knowledge of anatomical orientation of bilateral semicircular canals is essential, as all 6 canals influence the eye movements.

Subjects And Methods: Employing the new head coordinate system suitable for MR imaging, we calculated the angles of semicircular canal planes of both ears in 11 dizzy patients who had normal caloric response in both ears.

Results: The angles between adjacent canal pairs were nearly perpendicular in both ears. The angle between the posterior canal planes and head sagittal plane was 51° and significantly larger the angle between the anterior canal planes and head sagittal plane, which was 35°. The angle between the horizontal canal plane and head sagittal plane was almost orthogonal. Pairs of contralateral synergistic canal planes were not parallel, forming 10° between right and left horizontal canal planes, 17° between right anterior and left posterior canal planes and 19° between the right posterior and left anterior canal planes.

Conclusion: Our measurement of the angles of adjacent canal pairs and the angle between each semicircular canal and head sagittal plane coincided with those of previous reports obtained from CT images and skull specimens. However, the angles between contralateral synergistic canal planes were more parallel than those of previous reports.
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http://dx.doi.org/10.1016/j.anl.2011.07.020DOI Listing
October 2012

Dermoscopic features of a black hairy tongue in 2 Japanese patients.

Dermatol Res Pract 2010 26;2010. Epub 2010 Jul 26.

Department of Dermatology, Tokyo Women's Medical University Medical Center East, 2-1-10, Nishi-Ogu, Arakawa-ku, Tokyo 116-8567, Japan.

Dermoscopic features of a black hairy tongue have never been reported. Dermoscopy might be useful in speculating pathologic features of oral lesions. The objective was to identify additional dermoscopic criteria. Two Japanese patients who were clinically given a diagnosis of "black hairy tongue" were evaluated for dermoscopic features. We have shown characteristic dermoscopic features of brownish hair-like elongation of filiform papillae with whitish lingual papillae. Dermoscopic examination seemed useful as an adjunct to the diagnosis of this benign disorder of the tongue, demonstrating exact changes in shape and color of filiform papillae. It might also be helpful in more objective observation of the therapeutic efficacy.
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http://dx.doi.org/10.1155/2010/145878DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2913535PMC
July 2011

[Emergency care of vertigo patients: suggestions for efficient management].

Nihon Jibiinkoka Gakkai Kaiho 2009 Oct;112(10):697-704

Department of Otolaryngology, Head and Neck Surgery, Kyorin University School of Medicine, Tokyo.

Some diseases in which persons show vertigo or dizziness may be life-threatening, regardless of symptom severity, and require careful attention. These include diseases of the inner ear, central nervous system, and cardiovascular manifestation. In May 2006, a group in charge of primary emergency consultation began work enabling physicians to treat vertigo patients more efficiently and safely, as detailed in this report. Of the 173 persons with vertigo hospitalized from January 2004 to March 2008, six had cerebrovascular manifestations clarified only after hospitalization, underscoring the importance of careful examination, especially of those 75 years of age older, having continuous headache, having severe trunk ataxia despite apparently mild eye nystagmus, or reporting a history of high blood pressure, diabetes mellitus, hyperlipidemia, or ischemic heart disease.
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http://dx.doi.org/10.3950/jibiinkoka.112.697DOI Listing
October 2009

Acute-onset unilateral psychogenic hearing loss in adults: report of six cases and diagnostic pitfalls.

ORL J Otorhinolaryngol Relat Spec 2009 22;71(5):279-83. Epub 2009 Oct 22.

Department of Otolaryngology, Keio University School of Medicine, Tokyo, Japan.

We encountered 6 rare cases of acute-onset unilateral psychogenic hearing loss in adults. All were women in their 20s and 30s. Three cases had severe hearing impairment characterized by hearing loss at every frequency; 2 cases had profound hearing impairment, and 1 case had low-frequency hearing impairment. Of the 6 cases, 3 had a history of hearing loss, and 1 had a history of psychogenic visual disturbance. All 6 cases were initially diagnosed as having idiopathic sudden sensorineural hearing loss; all subsequently received steroid therapy. Three cases were not diagnosed as being psychogenic in origin until otoacoustic emissions and auditory brain responses were performed. Although the presence of distinctive clinical features (age, gender, and past history) is important for suspecting psychogenic hearing loss, objective audiological tests such as otoacoustic emissions are essential for diagnosing some cases. Compared to the existing reports of similar cases, our cases had a poorer prognosis (only 2 cases were cured).
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http://dx.doi.org/10.1159/000251195DOI Listing
February 2010

Lactosucrose inhibits body fat accumulation in rats by decreasing intestinal lipid absorption.

Biosci Biotechnol Biochem 2009 Mar 7;73(3):582-7. Epub 2009 Mar 7.

Biomedical Institute, Research Center, Hayashibara Biochemical Laboratories, Inc., Okayama, Japan.

Lactosucrose (LS, 4(G)-beta-D-galactosylsucrose) is a non-digestible oligosaccharide, and the consumption of LS selectively increases the proportion of intestinal bifidobacteria. We examined in this study the hypolipidemic potential of LS. An oral triolein tolerance test on rats indicated that LS reduced the elevation of serum triglyceride (TG) and free fatty acids (FFA). Furthermore, LS inhibited the enzymatic digestion of triolein by pancreatic lipase in vitro. NMR spectroscopy showed that LS formed an intermolecular complex with triolein. The long-term consumption of a diet containing 5% LS for 8 weeks significantly decreased the weight of abdominal adipose tissue when compared with that of the control group. Thus, LS may reduce adipose tissue accumulation by inhibiting intestinal lipid absorption via a direct interaction with TG.
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http://dx.doi.org/10.1271/bbb.80658DOI Listing
March 2009

Tryptanthrin inhibits interferon-gamma production by Peyer's patch lymphocytes derived from mice that had been orally administered staphylococcal enterotoxin.

Biol Pharm Bull 2003 Mar;26(3):365-7

Fujisaki Institute, Hayashibara Biochemical Laboratories, Inc., Okayama, Japan.

Tryptanthrin, a biologically active compound found in the medicinal plant Polygonum tinctorium, reportedly has several biological activities. We investigated the effects of tryptanthrin on cytokine production by lymphocytes in response to staphylococcal enterotoxin B (SEB), which causes a variety of disorders in humans based on its induction of large amounts of immunostimulatory cytokines. Tryptanthrin dose-dependently inhibited interferon-gamma (IFN-gamma) and interleukin-2 production by mouse spleen cells and Peyer's patch (PP) lymphocytes in vitro. The efficacy of tryptanthrin was further studied in a mouse model in vivo. Tryptanthrin was administered orally 2 h after an oral challenge with SEB. Nineteen hours after SEB administration, PP lymphocytes were prepared, and IFN-gamma production by PP lymphocytes was examined. The production of IFN-gamma increased after SEB administration, and the elevated IFN-gamma production was significantly inhibited by tryptanthrin treatment. These results suggest that tryptanthrin may be effective in the treatment of disorders of the intestines, such as food poisoning, that are associated with activated lymphocytes.
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http://dx.doi.org/10.1248/bpb.26.365DOI Listing
March 2003

Complete heart block resulting from quadricuspid aortic valve penicillin-resistant pneumococcal endocarditis: a case report.

Circ J 2003 Mar;67(3):275-6

Division of Cardiology, Hitachi General Hospital, Ibaraki, Japan.

A 62-year-old woman was referred to hospital to be treated for complete heart block with syncope. A quadricuspid aortic valve without vegetation and aortic valve regurgitation (AR) were observed by transesophageal echocardiography. Blood culture showed penicillin-resistant Streptococcus pneumoniae. The patient received a permanent pacemaker implantation (VDD type) and was given antibiotics. Although infection improved, heart failure was not improved because AR hemodynamic changes became worse. An aortic valve replacement was performed using a prosthesis on the 26th day of hospitalization. The patient recovered and was discharged.
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http://dx.doi.org/10.1253/circj.67.275DOI Listing
March 2003
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