Female ; Humans ; Hyperacusis ; surgery ; Labyrinth Diseases ; surgery ; Middle Aged ; Otologic Surgical Procedures ; methods ; Retrospective Studies ; Semicircular Canals ; pathology ; surgery

OBJECTIVES: To investigate the impact of labyrinthectomy and intratympanic (IT) gentamicin injections on the contralateral labyrinth, we also assessed the response of each individual semicircular canal to each IT gentamicin application. METHODS: We performed a pilot observational study on tertiary, referral, academic settings. Thirteen patients with unilateral vestibular pathology were organized into two groups, group I (seven patients) receiving IT gentamicin and group II undergoing labyrinthectomy (six patients). All patients underwent six-canal video-head-impulse test in predetermined time intervals. Patients receiving gentamicin were additionally tested 3 to 5 days after every sequential injection, until all ipsilateral canals were ablated, to determine the order of response to gentamicin. We recorded the vestibular-ocular reflex gains and the presence of covert/overt saccades for each canal. RESULTS: The posttreatment ipsilateral gains were abnormal. No patient from the gentamicin group developed abnormal contralateral responses, while patients undergoing labyrinthectomy had abnormal contralateral responses from at least one canal, even several months posttreatment. Finally, the lateral semicircular canal was the first one to be affected by IT gentamicin followed by the posterior canal: the superior canal was ablated last. CONCLUSION: In our study, labyrinthectomy had an impact on the responses recorded from the contralateral ear, while IT gentamicin ablated the ipsilateral labyrinthine function without affecting the contralateral responses, possibly because of a milder, more gradual impact. We also show for the first time the order that IT gentamicin application affects the semicircular canals, with the lateral being the first to be affected.
Ear ; Ear, Inner ; Gentamicins ; Head Impulse Test ; Humans ; Observational Study ; Pathology ; Referral and Consultation ; Reflex ; Saccades ; Semicircular Canals

OBJECTIVE: Differences in clinical features, especially facial nerve canal leision between cholesteatoma in external auditory meatus and middle ear were compaired. METHOD: A retrospective clinical analysis was made. Clinical data included 125 cases of middle ear cholesteatoma with facial nerve canal leision and 28 cases of cholesteatoma occurred in external auditory canal from 2003-01-2014-08 in our hospital. RESULT: Clinical course of cholesteatoma in external auditory canal was 4.97 ± 7.51 years, course of middle ear cholesteatoma was 16.60 ± 14.42 years (P < 0.01). 21 cases (75%) of external auditory canal cholesteatoma were manifested as pneumatic mastoid and 110 cases (88%) of middle ear cholesteatoma were manifested as diploic mastoid respectively. 22 cases (78.6%) of facial nerve canal damage-in mastoid segment in cholesteatoma of external auditory meatus and 76 cases (60.8%) of facial nerve canal damage in tympanic segment in cholesteatoma of middle ear were observed (P < 0.01). The incidence rate of ossicular errosion in middle ear chol-esteatoma was significantly higher than that in external auditory meatus (P < 0.01). The incidence of semicircular canal defects in middle ear cholesteatoma (30.4%), was significantly higher when comparing to the incidence (10.7%) in cholesteatoma of external auditory meatus (P < 0.05). CONCLUSION The site of facial nerve canal lesion in middle ear cholesteatoma and cholesteatoma of external auditory meatus were different. More attention should be paid before and during operation to avoid facial nerve injury, including physical examinations, especial otologic exams, radiological reading and careful operation.
Cholesteatoma, Middle Ear ; diagnosis ; pathology ; Ear Canal ; pathology ; Ear, Middle ; pathology ; Facial Nerve Injuries ; complications ; Humans ; Incidence ; Mastoid ; pathology ; Retrospective Studies ; Semicircular Canals ; pathology

OBJECTIVETo observe the changes of auditory steady-state response (ASSR) threshold in guinea pigs with posterior semicircular canal fistula.

METHODSIn 10 guinea pigs, a window was opened in the posterior semicircular canal of the left ear with the right ear serving as the control for testing the ASSR under anesthesia with pentobarbital sodium.

RESULTSThe mean and standard deviation of ASSR threshold (dB SPL) at 0.5, 1, 2, and 4 kHz in the left ear was 35.00+/-14.33, 25.50+/-12.37, 20.00+/-9.37 and 20.00+/-9.18, respectively, and was 31.00+/-16.19, 25.50+/-12.34, 18.00+/-6.96 and 18.50+/-6.71 in the right ear, respectively. Paired-sample t test showed no significant difference in the ASSR at the same frequency between the two ears.

CONCLUSIONSmall fistula by surgery causes no significant hearing loss in guinea pigs.

Animals ; Audiometry, Pure-Tone ; methods ; Auditory Threshold ; physiology ; Cochlea ; pathology ; Evoked Potentials, Auditory ; Fistula ; pathology ; physiopathology ; Guinea Pigs ; Labyrinth Diseases ; pathology ; physiopathology ; Semicircular Canals

Benign paroxysmal positional vertigo (BPPV) is characterized by episodic vertigo and nystagmus provoked by head motions. To study the characteristics of BPPV in a large group of patients in Korea, we retrospectively analyzed clinical features of 1,692 patients (women: 1,146, 67.7%; men: 54.6, 32.3%; mean age: 54.8+/-14.0 yr), who had been diagnosed as BPPV by trained neuro-otologists Dizziness Clinics. The diagnosis of BPPV was based on typical nystagmus elicited by positioning maneuvers. Posterior semicircular canal was involved in 60.9% of the patients, horizontal canal in 31.9%, anterior canal in 2.2%, and mixed canals in 5.0%. The horizontal canal type of BPPV (HC-BPPV) comprised 49.5% of geotropic and 50.5% of apogeotropic types. We could observe significant negative correlation between the proportion of HC-BPPV of each clinic and the mean time interval between the symptom onset and the first visit to the clinics (r=-0.841, p<0.05). Most patients were successfully treated with canalith repositioning maneuvers (86.9%). The high incidence of HC-BPPV in this study may be explained by relatively shorter time interval between the symptom onset and visit to the Dizziness Clinics in Korea, compared with previous studies in other countries.
Vestibular Function Tests ; Vertigo/*diagnosis ; Semicircular Canals/pathology ; Retrospective Studies ; Nystagmus, Physiologic ; Middle Aged ; Male ; Korea ; Humans ; Head Movements ; Female ; Aged

Superior semicircular canal dehiscence (SSCD) syndrome and otosclerosis have overlapping clinical manifestations that can be difficult to distinguish. Audiovestibular symptoms are caused by noise or straining in SSCD, which is associated with the presence of an air-bone gap that overlaps with the characteristic of otosclerosis. We recently examined a 51-year-old woman presenting with unilateral pulsatile tinnitus and ipsilateral hearing loss in the left ear. Computerized tomography, audiometry and vestibular function test confirmed the diagnosis of ipsilateral SSCD syndrome with coexisting ipsilateral otosclerosis. The patient underwent surgical repair of dehiscence by middle fossa approach and stapes surgery for otosclerosis sequentially. She has not had pulsatile tinnitus postoperatively, and hearing improved with the closure of air-bone gap at most frequencies. In conclusion, when SSCD syndrome and otosclerosis coexist and patient has representative symptoms of both ear pathologies, a sequential surgery can be an effective treatment option.
Audiometry ; Diagnosis ; Ear ; Female ; Hearing ; Hearing Loss ; Humans ; Middle Aged ; Noise ; Otosclerosis* ; Pathology ; Semicircular Canals* ; Stapes Surgery ; Tinnitus ; Vestibular Function Tests

OBJECTIVE: To compare the clinical features and outcomes of benign paroxysmal positional vertigo (BPPV) associated with Meniere's disease and idiopathic BPPV. METHOD: Reviewing the clinical records of 372 patients with BPPV, 289 patients with idiopathic BPPV and 36 patients with BPPV accompanied by Meniere's disease and were enrolled in this study. All patients were diagnosed by using the Dix-Hallpike test or roll test and treated with the canalith repositioning procedure. The outcomes were compared between the two groups. RESULT: The patients with BPPV associated with Meniere's disease presented the following features, in which they differed from the patients with idiopathic BPPV (P < 0.05): (1) a higher percentage of female patients; (2) a longer duration of symptoms; (3) frequent involvement of the horizontal semicircular canal; (4) a greater incidence of canal paresis; (5) more therapeutic sessions needed for cure and a higher rate of recurrence. CONCLUSION The BPPV associated with Meniere's disease differs from idiopathic BPPV in clinical features, treatment response recurrence tendency.
Benign Paroxysmal Positional Vertigo ; complications ; Female ; Humans ; Incidence ; Male ; Meniere Disease ; complications ; Paresis ; complications ; Patient Positioning ; Recurrence ; Retrospective Studies ; Semicircular Canals ; pathology

OBJECTIVE: To investigate diagnostic value and clinical application of MRI in the children with sensorineural hearing loss (SNHL) before cochlear implantation. METHOD: MRI images of 80 children with the diagnosis of SHNL were retrospectively analyzed in combination with the latest classification of inner ear malformation. RESULT: There were 152 ears of inner ear malformation of 80 cases (160 ears), including 38 ears of cochlear malformation, 33 ears of vestibular malformation, 41 ears of semicircular canal malformation, 37 ears of vestibular aqueduct enlargement, 40 ears of internal auditory canal malformation, and 46 ears of cochlear nerve malformation. CONCLUSION MRI can provide detailed and reliable anatomical information for children with SNHL before cochlear implantation, and help to make the classification diagnosis. Therefore MRI is of great clinical significance for operation plan guidance and prognosis assessment.
Child ; Cochlear Implantation ; Cochlear Nerve ; pathology ; Hearing Loss, Sensorineural ; diagnosis ; pathology ; Humans ; Magnetic Resonance Imaging ; Retrospective Studies ; Semicircular Canals ; pathology ; Temporal Bone ; pathology ; Tomography, X-Ray Computed ; Vestibular Aqueduct ; abnormalities ; pathology

INTRODUCTIONThis study aimed to examine the relationship between the air-bone gap (ABG) and the size of the superior semicircular canal dehiscence (SSCD) as measured on a computed tomography (CT) scan.

MATERIALS AND METHODSThe study design was a case series with chart review. Twenty-three patients (28 ears) from a tertiary referral centre were diagnosed with SSCD. The size of the dehiscence on CT scans and the ABG on pure-tone audiometry were recorded.

RESULTSThe size of the dehiscence ranged from 1.0 to 6.0 mm (mean, 3.5 ± 1.6 mm). Six ears with a dehiscence measuring less than 3.0 mm did not have an ABG (0 dB). The remaining 18 ears showed an average ABG at 500, 1000, and 2000 Hz (AvABG(500-2000)) ranging from 3.3 to 27.0 dB (mean, 11.6 ± 5.7 dB). The analysis of the relationship between the dehiscence size and AvABG(500-2000) revealed a correlation of R(2) = 0.828 (P <0.001, quadratic fit) and R(2) = 0.780 (P <0.001, linear fi t). Therefore, the larger the dehiscence, the larger the ABG at lower frequencies on pure-tone audiometry.

CONCLUSIONIn SSCD patients, an ABG is consistently shown at the low frequency when the dehiscence is larger than 3 mm. The size of the average ABG correlates with the size of the dehiscence. These findings highlight the effect of the dehiscence size on conductive hearing loss in SSCD and contribute to a better understanding of the symptomatology of patients with SSCD.

Adult ; Aged ; Audiometry, Pure-Tone ; instrumentation ; methods ; Bone Conduction ; Female ; Hearing Loss, Conductive ; diagnosis ; pathology ; Humans ; Hyperacusis ; diagnosis ; pathology ; Male ; Middle Aged ; Reference Values ; Retrospective Studies ; Semicircular Canals ; pathology ; Statistics as Topic ; Temporal Bone ; pathology ; Tomography, X-Ray Computed ; Vertigo

A pregnant female taken realgar because of superstition, which caused the baby congenital deafness. Auditory test indicated that bilateral auditory brainstem response (ABR) hearing threshold level was greater than 90 dB nHL and auditory steady state response (ASSR) hearing level ranging from 0.5 kHz to 4 kHz was beyond 110 dB HL. Temporal bone CT showed that bilateral cochlear and semicircular canal malformations, with internal auditory canal broadened.
Arsenicals ; adverse effects ; Evoked Potentials, Auditory, Brain Stem ; Female ; Hearing Loss, Sensorineural ; chemically induced ; congenital ; Hearing Tests ; Humans ; Infant ; Maternal Exposure ; adverse effects ; Pregnancy ; Semicircular Canals ; pathology ; Sulfides ; adverse effects ; Temporal Bone ; pathology