Navegando por Palavras-chave "cóclea"

Agora exibindo 1 - 4 de 4
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    Anatomia microscópica do canal carótico e suas relações com a cóclea e a cavidade timpânica
    (ABORL-CCF Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico-Facial, 2005-08-01) Penido, Norma de Oliveira [UNIFESP]; Borin, Andrei [UNIFESP]; Fukuda, Yotaka [UNIFESP]; Lion, Cristina Navarro Santos [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    The knowledge of the relations between the noble and vital structures of temporal bone is still a great challenge for the otologic surgeon. The microscopic anatomic studies of the temporal bone are one of the greatest help to prevent lesions during surgical intervention. AIM: To study the anatomic correlations between the carotid canal and the cochlea, and the occurrence of dehiscence of the carotid canal in the middle ear tympanic cavity. MANTERIAL AND METHODS: Microscopic study of 122 human temporal bones. RESULTS: The average distance between the carotid canal and the cochlea were: the shortest distance, 1.05mm; basal turn, 2.04mm; middle turn, 2.32mm; and apical turn, 5.70mm. The occurrence of dehiscence of the carotid canal inside the tympanic cavity was 35.2%. CONCLUSION: The small distances between the cochlea and carotid canal, and the high incidence of dehiscence in the tympanic cavity remind us that anatomical knowledge of the temporal bone is required for the best qualification of otologists.
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    Efeito da oxigenação hiperbárica em lesão ototóxica produzida pela amicacina em cobaias
    (Associação Brasileira de Otorrinolaringologia e Cirurgia Cervicofacial, 2013-06-01) Amora, Luciana de Albuquerque Salviano; Murashima, Adriana de Andrade Batista; Rossato, Maria; Moreira, Márcia Bento; Hyppolito, Miguel Ângelo; Fagundes, Djalma José [UNIFESP]; Universidade de São Paulo (USP); Universidade Federal do Vale do São Francisco Colegiado de Medicina Veterinária; Universidade Federal de São Paulo (UNIFESP)
    Hyperbaric oxygen therapy (HBOT) has enhanced the prevention and treatment of auditory ailments such as ototoxicity. OBJECTIVE: To study the effects of HBOT upon ototoxic injuries produced by amikacin. METHOD: This experimental study included 12 albino guinea pigs, whose auditory function was assessed through distortion product otoacoustic emissions (DPOAEs) and brainstem auditory evoked potentials (BAEPs) before and after the administration of amikacin (600 mg/kg/day) and HBOT sessions (2 ATA, 60 minutes). Morphological features were analyzed through scanning electron microscopy. Subjects were divided into four groups, as follows: group 1 - saline solution + HBOT; group 2 - amikacin for 8 days; group 3 - amikacin + seven days of rest; and group 4 - amikacin + HBOT. RESULTS: Group 1 subjects had preserved function and morphology throughout the experiment; Group 2 subjects had statistically significant levels of hair cell injury and functional impairment; Subjects on groups 3 and 4 had statistically significant functional and morphological impairment after the administration of amikacin, which were still present after the proposed procedures had been carried out. CONCLUSION: Hyperbaric oxygen therapy did not change the cochlear hair cell morphology or the electro-physiological thresholds of the guinea pigs given amikacin.
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    Identificação de zonas mortas da cóclea por meio do teste TEN
    (ABORL-CCF Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico-Facial, 2006-10-01) Jacob, Regina Ts; Fernandes, João Cândido; Manfrinato, Jair; Iorio, Maria Cecilia Martinelli [UNIFESP]; Universidade de São Paulo (USP); Universidade Estadual Paulista (UNESP); Universidade Federal de São Paulo (UNIFESP)
    An audiogram is not sufficient to indicate cochlear dead regions. AIM: To investigate cochlear dead regions in sensorineural hearing loss subjects using the TEN test. Site: CEDALVI/ HRAC-USP-Bauru/São Paulo/Brazil, August 2003 to February 2004. STUDY DESING: A contemporary cross-sectional cohort study. Material and Methods: The TEN test was applied in three groups: G1(5 women with pure-tone thresholds within normal limits); G2(4 women and 5 men with moderate sensorineural flat hearing loss); G3(19 women and 24 men with mild to severe sloping sensorineural hearing loss). RESULTS: In the G1 group the TEN value required to eliminate the test tone was, on average, close to the absolute threshold for all frequencies. No dead regions were found in the ears tested in group G2. 76 ears were tested in group G3, and six showed no evidence of dead regions in the cochlea. CONCLUSIONS:The TEN test was an effective test to indicate a dead region in the cochlea of subjects with sloping sensorineural hearing loss. There is evidence that pure-tone detection is different for subjects with high frequency sensorineural hearing loss and flat hearing loss; we observed a significant difference between the masked threshold and the absolute threshold only in sloping hearing loss and not for flat hearing loss.
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    Tomografia computadorizada no diagnóstico da otosclerose retrofenestral
    (ABORL-CCF Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico-Facial, 2004-01-01) Vicente, Andy de Oliveira [UNIFESP]; Penido, Norma de Oliveira [UNIFESP]; Yamashita, Helio Kiitiro [UNIFESP]; Mangabeira-Albernaz, Pedro Luiz [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); Hospital Cema
    AIM: To identify the main tomographic findings of retrofenestral otosclerosis. METHODS: A prospective and multicentric study using computed tomography (CT) of the temporal bone in 54 patients with a clinical and surgical diagnosis of otosclerosis. A tomographic analysis has been performed to evaluate the utility of CT scans in diagnosing retrofenestral otosclerosis, verifying the sites of predilection for otosclerotic lesions. In this study, 22 patients undergone CT scans of temporal bones have been included in order to investigate other otologic diseases and have constituted the control group. RESULTS: The tomographic findings were mostly bilateral and the retrofenestral focus more prevalent was the pericochlear focus. CONCLUSIONS: The CT scan was useful in the identification of the retrofenestral focuses. The evidence of this focuses and the presence of the endosteal involvement of the cochlea can suggest a higher activity of the disease.