ABSTRACT
Cochlear activity was evaluated by means of otoacoustic emission in patients with normal hearing and insulin-dependent diabetes mellitus. Twenty diabetic subjects were studied by recording click evoked otoacoustic emissions (TEOAE) and distortion products otoacoustic emissions (DPOAE) 2fl-f2 and comparing the results with those obtained in a control group of non-diabetic with normal hearing. The results obtained in the diabetic group showed a statistically significant decrease in mean amplitude, in the amplitude of every click evoked otoacoustic emissions and in the mean amplitudes of various distortion products compared with the control group. These findings suggest the presence of cochlear disorders in diabetic patients, probably produced by impaired functional properties of the outer hair cells.
Subject(s)
Acoustic Stimulation/methods , Cochlear Diseases/etiology , Cochlear Diseases/physiopathology , Diabetes Mellitus, Type 1/complications , Hair Cells, Auditory, Outer/physiopathology , Adolescent , Adult , HumansABSTRACT
Distortion products are a subtype of otoacoustic emission. The normality of distortion products reflects correct outer hair cell function. Test results obtained from patients with neurosensorial, cochlear and retrocochlear hearing loss were analyzed, focusing on four points: correlation with audiometric results, reliability for the follow-up of dynamic cochlear disorders, frequency specificity, and topographic diagnosis.
Subject(s)
Cochlea/physiopathology , Hearing Loss, Sensorineural/physiopathology , Audiometry, Pure-Tone , Hearing Loss, Sensorineural/diagnosis , HumansABSTRACT
The AA. of the present paper recall the clinical and functional results of this therapy in a group of 70 patients complaining of vertigo. The Gingko biloba extract (4 ml/12 h per mouth) has been continued during 6 months. Neck and vertebrobasilar insufficiency were predominant causes. Six months later statistically significant changes regarding the decrease of intensity of tinnitus and vertigo crises were confirmed. Besides favorable alterations in the peripherical symptomatology as a relative hearing improvement turned up.
Subject(s)
Brain Ischemia/complications , Cochlea/physiopathology , Plant Extracts/therapeutic use , Vertebrobasilar Insufficiency , Vertigo , Vestibule, Labyrinth/physiopathology , Adult , Aged , Audiometry, Pure-Tone , Female , Hearing Disorders/diagnosis , Hearing Disorders/drug therapy , Humans , Male , Middle Aged , Vertebrobasilar Insufficiency/drug therapy , Vertebrobasilar Insufficiency/etiology , Vertebrobasilar Insufficiency/physiopathology , Vertigo/drug therapy , Vertigo/etiology , Vertigo/physiopathologyABSTRACT
Evoked otoacustic emissions recording hold some promise as a fast objective and non-invasive audiological procedure to study the cochlea at the outer hair cell level. This study has been made in 100 voluntary normal hearing adults. We evaluate the auditory system by means of evoked otoacustic emissions with a non-linear click. This report resumes methods and results in these normal grown-up ears.
Subject(s)
Acoustic Stimulation , Cochlea/physiology , Hearing/physiology , Adult , Humans , Middle AgedABSTRACT
Distortion product otoacoustic emissions (DPEs) are a subtype of evoked otoacoustic emissions that represent a class of cochlear response. Because of their frequency specificity and the wide range of frequencies explored DPEs have a great potential for clinical use. DPEs studies include DP-audiograms and input/output functions. We recorded 27 DPEs, 24 of them from normal ears and 3 from pathological ears. This report resumes methods and results.
Subject(s)
Basilar Membrane/physiopathology , Cochlear Microphonic Potentials , Hearing Loss, Sensorineural/physiopathology , Acoustic Stimulation , Adult , Audiometry, Pure-Tone , Female , Humans , Male , Meniere Disease/physiopathology , Otosclerosis/physiopathology , Reference ValuesABSTRACT
The paper reports the experimental task done by the AA, in order to probe objectively the being of a feed-back circuit of cochlear interconnexion. This loop is basically represented by the medial efferent olivo-cochlear system. With that purpose they have analyzed the variations produced in the provoked acoustic otoemissions by clicks registered in one ear when the contralateral ear is stimulated with a white noise of 80 dB HL. The results shows that after stimulation of the contralateral cochlea with a white noise a decrease of the global amplitude of the PAOE is observed and also a decrease of the several amplitudes composing the frequency spectrum, but retaining the same morphological pattern.
