In this study, the steady state response to gravity and unbalance force, major natural vibration of a general rotor bearing system with open or open-close type crack, is analyzed along iterative numerical calculation method (the transfer matrix method). The crack idealized as step function bending moment. nonlinear equations are linearized by using Fourier expansion technique, its solutions given approximately static deflection, once/rev. vibration, twice/rev. vibration. calculated confirmed...

To investigate the vestibular system changes in sudden deafness with vertigo (SDwV) and without (SDwoV) cause of persistent canal paresis (CP) SDwV patients.Retrospective study.Four temporal bones from affected ear 4 patients unilateral (SD), 2 SDwoV, were selected. Four contralateral normal-hearing ears defined as control. Morphologic findings labyrinth, number Scarpa's ganglion cells, density hair cells investigated all bones. Clinical data results tests 11 SD, a separate group, also...

To determine the subjective visual vertical (SVV) perception in patients with vestibular neuritis (VN) and sudden sensorineural hearing loss (SSHL) using SVV test other neuro-otological examinations, namely, evoked myogenic potential (VEMP) caloric tests, to clarify which nerve function is associated an shift.We performed 36 VN 80 SSHL patients. Thereafter, we investigated directional changes patients, compared results of those VEMP tests.Abnormal (> 2° was found at a rate 69.4% 26.3% In all...

Conclusion: Patients with vestibular neuritis (VN) complete canal paresis (CP) showed a higher rate of abnormal ocular evoked myogenic potential (oVEMP) than those partial CP. From these results, it is speculated that the superior nerve function mainly affects oVEMP. Significant correlation was found between grades hearing outcome and oVEMP in sudden sensorineural loss (SSHL). Objective: We attempted to correlate results cervical VEMP (cVEMP), subjective visual vertical (SVV), clinical...

This paper presents an analytical method for the evaluation of synchronous response a general asymmetric rotor-bearing system. In analysis, slightly shaft stiffness in bending and shearing, which distribute along rotor, transverse mass moment inertia are considered. The dynamic properties bearings pedestals assumed to be anisotropic coupled each direction. equations motion with periodic time dependent coefficients solved by Harmonic Balance Method formulated transfer matrix. These solutions...

Abstract Aim This prospective observational study aimed to investigate the effects of ryokeijutsukanto on dizziness in patients with orthostatic dysregulation (OD) and explore its potential address diverse symptoms resulting from autonomic dysfunction. also identify factors contributing effectiveness managing OD. Methods Patients diagnosed OD were treated between February 4, 2022 April 1, 2024. underwent various assessments completed questionnaires, including Vertigo Symptom Scale‐Short Form...

Conclusion: The cupula shows various degrees of changes after gentamicin (GM) injection into the inner ear, with or without damage sensory cells. This change may be a part etiology peripheral vertigo, and is also potentially one mechanisms reduced caloric response. Objectives: To observe morphological injecting GM in frog ear to compare those ampullary Methods: We injected 300 μg (7.5 μl) 30 bullfrogs (Rana catesbeiana) using microsyringe under ether anesthesia. same amount saline was other...

Dysequilibrium is one of the most important side effects ear surgery. The subjective visual vertical can be used as a good indicator for evaluation otolithic function in patients with surgery.To investigate influence various types surgery on organs.Seventy-one underwent Subjective (SVV) test was performed before and after We investigated directional changes SVV surgery.The postoperative two who translabyrinthine removal vestibular schwannoma shifted toward operated side, but following other...

Objective To evaluate the maturity of peripheral vestibular system in Down syndrome by examining number Scarpa’s ganglion cells and density hair cells. Study Design Case‐control study using human temporal bones. Setting Tertiary academic center, otopathology laboratory. Subjects Methods Sixteen bones from 8 patients with 15 control individuals no history otologic disease were selected. Hypoplasia lateral semicircular canal (LSC) vestibule was investigated measuring dimensions structures....

Conclusion: Various changes were observed in the cupula, including shrinkage and enlarged volume, following disruption of membranous labyrinth. Cupular change after labyrinth may be a pathology vestibular disorders. Objectives: To observe morphological cupula to compare cupular with compound action potential (CAP) ampullary nerve. Methods: A labyrinthine injury model was created by puncturing bullfrogs. The from 3 17 days membrane puncture. CAP response mechanical endolymphatic flow recorded...

OBJECTIVE: We investigated the neuro-otological findings, including nystagmus, and clinical course of patients with horizontal canal variant benign paroxysmal positional vertigo (HC-BPPV), who showed spontaneous inversion nystagmus wit

Conclusion: Postural restrictions are probably not necessary after the canalith repositioning procedure (CRP). Objectives: Epley reported effect of CRP for benign paroxysmal positional vertigo (BPPV). After CRP, patients often requested to restrict postural change. However, some studies suggested that may work without restrictions. The present study aimed determine necessity post-maneuver restriction using frog labyrinth model. Methods: otoconial mass from sacculus was placed on utricular...

Abstract Objective: To investigate what kinds of stimuli are effective in detaching otoconia from the cupula three experimental models cupulolithiasis. Methods: Three cupulolithiasis were prepared using bullfrog labyrinths. applied to models. In experiment one (gravity), labyrinth preparation was placed so that cupula-to-crista axis horizontal plane with canal side downward position. two (sinusoidal oscillation), 3 cm rotational centre a turntable, which sinusoidally rotated cycle 1 Hz and...

Abstract Objective: To examine the clinical features, age and gender distribution of patients, treatment methods, outcomes benign paroxysmal positional vertigo. Methods: This paper reports a review 357 patients treated for this condition at single institution over duration 5 years. Patients with posterior canal vertigo were divided into two groups: one group underwent Epley manoeuvre other received medication. The lateral canalolithiasis also Lempert Lastly, cupulolithiasis medication...

Abstract Objectives: To determine the characteristics of acute phase nystagmus in patients with cerebellar lesions, and to identify a useful indicator for differentiating central lesions from peripheral lesions. Methods: Acute appearance neurological symptoms were retrospectively investigated 11 stroke. Results: At initial visit, there no vertical nystagmus, direction-changing gaze evoked or pure rotatory nystagmus. There four cases seven horizontal at visit. symptoms, except vertigo hearing...

Conclusion: With half-sized cupula, the semicircular canal nerve potentials decreased under slow stimulus, thus potentially leading to reduced caloric response. This also suggests that shrunken cupula may cause dizziness because of its hypermobility. Objectives: To examine physiological effect on potential. Methods: The isolated bullfrog was sectioned in half with fine scissors and replaced crista. Mechanical endolymphatic flow fast stimuli were delivered evoked action recorded. Results:...

Abstract Objectives: Using American bullfrog models under normal conditions and vestibular dysfunction, we investigated whether mechanical vibration applied to the ear could induce otoconial dislodgement. Methods: Vibration was labyrinth of using a surgical drill. The time required for otoconia dislodge from utricular macula measured. Vestibular dysfunction were created dislodgement compared with models. morphology also investigated. Results: In models, average occur 7 min 36 s; in it 2 11...

Benign paroxysmal positional vertigo (BPPV) is usually idiopathic, but in some cases, it arises after inner ear disease. We examined the cases with and without BPPV-like symptoms sudden deafness (SD), Ménière's disease (MD) vestibular neuritis (VN). The equilibrium function tests (caloric test, VEMP SVV) results were not different between groups or symptoms, hospitalization was needed more frequently symptoms. posterior semicircular canal (PSC) most frequent focus of both idiopathic BPPV...