Biomedical subjects

Keiko Kakizaki

Publications and source records attributed to Keiko Kakizaki.

5 recordsLinked to original sources

PubMed2006

Eustachian tube function in patients with eosinophilic otitis media associated with bronchial asthma evaluated by sonotubometry.

OBJECTIVE: To determine eustachian tube function in patients with asthma and with or without eosinophilic otitis media (EOM), a new middle ear disease entity with a highly viscous middle ear effusion containing many eosinophils and usually associated with bronchial asthma. One of the most important causes of otitis media (OM) is eustachian tube dysfunction. DESIGN: Retrospective case review. SETTING: A referral center. PATIENTS: Twenty patients with EOM and patients with asthma but without OM. MAIN OUTCOME MEASURES: We studied eustachian tube function using sonotubometry and a questionnaire. Sonotubometry was also performed on 13 control patients with chronic otitis media (COM) and 7 normal controls. RESULTS: The tubal opening duration was significantly longer in patients with EOM than in patients with asthma but without OM, controls with COM, and normal controls, indicating the presence of patulous eustachian tubes in patients with EOM. Responses to the questionnaire also supported the presence of patulous eustachian tubes in the patients with EOM. CONCLUSIONS: The presence of a patulous eustachian tube may be a major cause of EOM in patients with bronchial asthma. In patients with asthma who have a helper T-cell 2-dominant predisposition, a patulous eustachian tube easily allows the entry of antigenic materials into the middle ear, causing eosinophil-dominant inflammation.

Adult↗

PubMed2006

Effectiveness of instillation of triamcinolone acetonide into the middle ear for eosinophilic otitis media associated with bronchial asthma.

BACKGROUND: Eosinophilic otitis media (EOM) is a newly recognized middle ear disease found in asthmatic patients. EOM is characterized by a highly viscous middle ear effusion that contains many eosinophils and is extremely unresponsive to conventional treatments for common otitis media. To our knowledge, no systemic study regarding the efficacy of treatments for EOM has been performed. OBJECTIVE: To determine the effectiveness of instillation of triamcinolone acetonide, which is a suspension of steroids, into the mesotympanum and eustachian tube as a treatment for patients with EOM. METHODS: We studied the efficacy of the instillation of triamcinolone acetonide in 43 ears of 24 patients with EOM. Efficacy was evaluated according to the length of the period without middle ear effusion or otorrhea. We also determined the otomicroscopic findings and the hearing levels before and after therapy. For controls, 27 ears of 14 patients treated by topical administration of betamethasone were similarly evaluated. RESULTS: The middle ear effusion or otorrhea was controlled for more than 3 weeks after 1 instillation of triamcinolone acetonide in 35 ears, and the efficacy rate (81%) was significantly higher than that in the controls (7 ears, 26%). In the triamcinolone acetonide group, the average air conduction hearing level at the speech frequency range was significantly improved, and deterioration of the bone conduction hearing threshold was rarely found during therapy. CONCLUSION: The instillation of triamcinolone acetonide into the mesotympanum and eustachian tube is an effective treatment for patients with EOM.

Adult↗

PubMed2006

Temporal bone histopathologic abnormalities associated with mitochondrial mutation T7511C.

OBJECTIVES: We previously reported a mitochondrial T7511C mutation in the tRNA gene in a Japanese family with nonsyndromic hearing loss (HL). However, the temporal bone histopathology associated with T7511C has not been reported. The aim of the present study is to report histopathologic findings of a temporal bone from a patient in the Japanese family with this mutation. STUDY DESIGN: Single case study. METHODS: A temporal bone was obtained from the right ear of a male subject with progressive HL from 5 years of age and who died at 60 years of age from cerebral infarction. The bone was embedded, sectioned, and stained with hematoxylin-eosin for light microscopic study. Graphic reconstruction of the cochlea was performed using the method described by Schuknecht to determine loss of the stria vascularis and neurosensory elements including hair cells and spiral ganglion neurons. RESULTS: The most significant histopathologic finding was severe loss of spiral ganglion cells in all turns of the cochlea. Severe loss of neuronal filaments in Rosenthal's canal was also observed. The organ of Corti showed scattered loss of inner and outer hair cells in the basal turn. Partial atrophy of the stria vascularis was observed in all turns of the cochlea. CONCLUSION: Our results suggest that severe loss of spiral ganglion cells was the main cause of sensorineural HL associated with the T7511C mutation.

Atrophy↗

PubMed2004

[Case of recurring middle ear adenoma].

We report a case of recurring middle ear adenoma with bone formation that was histologically difficult to differentiate from adenocarcinoma. The patient was a 31-year-old female. Preoperative clinical and CT findings in the 31-years-old woman examined suggested benign tumor of the middle ear. Although intraoperative pathological examination indicated adenocarcinoma, tympanoplasty in canal reconstruction was done. Malignancy was not considered because the tumor had not increased in size for 1 year and no bone erosion had occurred in the ossicles or middle ear cleft. The definitive pathological diagnosis was middle ear adenoma. The tumor repeatedly recurred thereafter, closely resembling normal middle ear mucosa and making it difficult to remove completely. When middle ear adenoma is suspected, surgical procedures should be determined carefully based on radiological and intraoperative findings in tumor expansion.

Adenoma↗

PubMed2003

Acoustic trauma.

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Aged↗