Publications by authors named "Satofumi Sugimoto"
Article Synopsis
- The study investigates the significance of bilateral high signal intensity (SI) in the endolymphatic duct (ED) observed in MRI scans of patients with various otological disorders, particularly focusing on its correlation with clinical symptoms.
- A retrospective analysis of MRI findings from 2,450 ears belonging to 1,225 patients reveals that high SIs in the ED are linked to lower occurrences of endolymphatic hydrops (EH) and different audiometric thresholds.
- The results suggest that high SI in the ED may indicate underlying pathophysiological processes related to sensorineural hearing loss and vestibular issues, rather than being associated with the presence of EH.
Background: Posterior expansion of the utricular endolymphatic space (ES) is a finding occasionally observed, and often occurs in bilateral ears. The clinical significance of posterior expansion of the utricular ES is not clear.
Objectives: To investigate the clinical significance of posterior expansion of the utricular ES detected on magnetic resonance imaging (MRI).
Improvement of vertigo symptoms and acoustic power absorbance in cases with endolymphatic hydrops.
Laryngoscope Investig Otolaryngol
February 2024
Article Synopsis
- The study examines the effects of middle ear pressure therapy (MEPT) on symptoms and endolymphatic hydrops (EH) in patients with Meniere's disease (MD) through MRI and acoustic power measurements.
- Eleven patients participated, showing improvements in vertigo scores after one year of MEPT, but most did not show significant changes in the severity of EH.
- Although EH severity did not improve significantly, there was an enhancement in acoustic power absorbance, suggesting that changes in inner ear pressure may influence vestibular symptoms even if EH remains unchanged.
Clinical findings on cartilage conduction hearing aids (CCHAs) have gradually become clear; however, few reports include a large number of cases. This study included 91 ears from 69 patients who underwent CCHA fitting in our hospital. Their ears were divided into six groups (i.
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- The study evaluates the listening conditions of 31 adult cochlear implant users, looking at the impact of surgical timing (sequential vs. simultaneous) on their hearing abilities in everyday environments.
- Results show that the second cochlear implant (CI) in those with sequential surgery performed worse in speech discrimination compared to other CIs, and its usage increased in noisy settings.
- The findings suggest that while sequentially implanted CIs may struggle with clarity, they are still beneficial in complex listening situations, indicating a need for tailored rehabilitation approaches for CI users.
The potential mechanism of augmented response on cervical vestibular evoked myogenic potential (cVEMP) testing and its decrease following treatment in a patient with Meniere's disease (MD) are discussed. Changes of static posturography and cVEMP testing before and after a glycerol drip in a 69-year-old man with unilateral MD, in which significant endolymphatic hydrops (EH) was confirmed on magnetic resonance imaging (MRI) on the diseased side, were evaluated. Values of total locus lengths, areas of postural sway, and their Romberg ratios were decreased after the glycerol drip.
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- Listening difficulties (LiD) occur despite normal hearing test results, often linked to endolymphatic hydrops (EH), a condition affecting the inner ear.
- A study using MRI on 20 patients with LiD found that those with significant EH had poorer performance on auditory processing tests (APTs), particularly in noisy environments.
- The research concludes that EH in the cochlea impacts auditory processing, highlighting that normal hearing tests don't capture all underlying issues affecting listening abilities.
Impact of endolymphatic hydrops on DPOAE in subjects with normal to mild hearing loss.
Laryngoscope Investig Otolaryngol
February 2023
Article Synopsis
- The study focuses on how increased endolymph volume affects the ear structure and may influence the distortion-product otoacoustic emissions (DPOAE) in patients with endolymphatic hydrops (EH).
- Researchers analyzed 403 patients with hearing or balance issues, comparing DPOAE responses and hearing levels to understand the relationship between EH and hearing ability.
- Results showed no correlation between DPOAE amplitude and EH presence, but indicated that patients with cochlear EH had better DPOAE responses, suggesting that changes in DPOAE may reflect early morphological changes in the inner ear.
We evaluated the inner ear distribution of O-labeled saline administered to the human tympanic cavity. Magnetic resonance imaging was performed after intratympanic administration in five healthy volunteers and one patient with cochlear endolymphatic hydrops. In all volunteers, O-labeled water permeated the cochlear basal turn and vestibule at 30 min and disappeared gradually within 2-4 h.
View Article and Find Full Text PDFWe summarize the presence of endolymphatic hydrops (EH) in otological disorders evaluated with magnetic resonance imaging (MRI) of temporal bones, and propose a classification of EH based on its pathological significance. A search of the literature published in English-language journals was performed using electronic databases, especially focusing on EH-related otological disorders. Clinical articles that contained the terms EH and contrast-MRI published from 2007 to the present, with relevant human temporal bone studies, were included.
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- Innovated cartilage conduction hearing aids (CC-HAs) perform well for patients with closed ears and chronic otorrhea, but understanding the factors influencing their purchase rate is still unclear.
- A study with 249 patients analyzed demographics and clinical characteristics, revealing younger individuals in the unilateral closed-ear group were more likely to purchase CC-HAs, and those in the bilateral closed-ear group had better outcomes at certain frequencies.
- The type of transducer used affected the continued-use rate, particularly in patients with nonclosed ears, but overall, the purchase rates in chronic otorrhea cases were similar to those with closed ears.
Otitis media with antineutrophil cytoplasmic antibody-associated vasculitis (OMAAV) has been proposed as a new type of otitis media. The hearing loss caused by OMAAV can be expected to improve with early detection and intervention, but if it continues to worsen and leads to deafness, it is challenging to recover the patient's hearing. When bilateral deafness occurs, cochlear implant (CI) surgery is the only way to improve hearing.
View Article and Find Full Text PDFBackground: Otological diseases including Meniere's disease (MD) involve endolymphatic hydrops (EH), which can be visualized by magnetic resonance imaging (MRI) with gadolinium contrast agents, but the temporal changes of contrast in the inner ear have not been evaluated.
Objectives: We investigated the permeability of the blood-perilymph barrier (BPB) in ears with EH to evaluate the severity of the inner ear disturbances.
Materials And Methods: The study included 32 ears from 16 patients with EH or related diseases who underwent MRI.
Background: Cartilage conduction hearing aids (CCHAs) were newly devised and spread fast in Japan since their launch in 2017. However, little knowledge is available for this new device.
Purpose: The aim of this study was to establish the knowledge of CCHAs and suggest their indication.
Objectives: To investigate the clinical features of ears with dilatation of the endolymphatic space in the ampulla of the posterior semicircular canal on magnetic resonance imaging.
Study Design: Retrospective study.
Setting: A university hospital.
Background: High signals in the inner ear of idiopathic sudden sensorineural hearing loss (ISSNHL) on magnetic resonance imaging (MRI) have been reported, but no quantitative evaluation has yet been done.
Objectives: To evaluate hearing outcomes and cochlear signal intensities on 3-T heavily T-weighted three-dimensional fluid-attenuated inversion recovery magnetic resonance imaging (hTW-3D-FLAIR) in patients with ISSNHL.
Materials And Methods: Twenty-nine patients with ISSNHL were included.
Background: High signal intensity in the endolymphatic duct (ED) is occasionally observed on magnetic resonance imaging (MRI) in ears that have otological disorders.
Objective: The signal intensity (SI) in the ED on post-contrast MRI was investigated in subjects with various otological disorders, and the meaning of high SI in the ED was evaluated.
Material And Methods: 392 patients with otological disorders and 21 controls without otological symptoms underwent 3 T MRI.
The presence of endolymphatic hydrops (EH) may cause hearing loss and affect the transmission of acoustic energy to the inner ear. Acoustic energy absorbance on wideband acoustic immittance (WAI) was evaluated, focusing especially on EH in the vestibule. A total of 32 ears from 16 patients who underwent 3-T magnetic resonance imaging (MRI) to evaluate the presence of EH were examined, retrospectively.
View Article and Find Full Text PDFTwo patients with auditory neuropathy spectrum disorder (ANSD) considered to be associated with Charcot-Marie-Tooth (CMT) are reported. In case 1, a 23-year-old man presented with progressive bilateral sensorineural hearing loss (SNHL) from 10 years of age and was diagnosed with ANSD. He was later diagnosed with CMT by neurological testing.
View Article and Find Full Text PDFWe investigated the otological aspects of Fabry disease (FD) in patients with normal hearing. Forty-one patients (21 men, 20 women) with bilaterally normal hearing were recruited, and their otological symptoms and hearing evaluations, which included pure tone audiometry (PTA) and distortion product otoacoustic emission (DPOAE), were investigated. Ten of the 21 male (47.
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- The study aimed to explore the presence of endolymphatic hydrops (EH) in patients with otosclerosis using MRI, focusing on clinical features and potential predictors for EH.
- The research involved 46 ears from 37 patients, categorizing them into groups based on the severity of EH and comparing hearing levels and otosclerotic lesion extent.
- Results indicated that 58.7% of ears had EH, with significant cases linked to more severe hearing loss and advanced disease, as well as increased blood flow in certain areas.
Background: Diverticula in the internal auditory canal (IAC) have been reported in ears with otosclerosis.
Objective: We evaluated hearing levels and vascular activity in ears with otosclerosis with and without IAC diverticula and clarify the significance of IAC diverticula.
Materials And Methods: Sixty-one ears from 54 patients who underwent stapes surgery for otosclerosis [fenestral (48 ears) and retrofenestral (13 ears) groups] were included in the present study.