[Correlation between the contralateral supressor effect and the auditory fatigue using transitory acoustic otoemissions]. / Estudio de la correlación existente entre el efecto supresor contralateral y la fatiga auditiva mediante otoemisiones acústicas transitorias.

OBJECTIVE: The purpose of this study is the identification of susceptible individuals to develop noise induced hearing loss. For it we use the capacity of the transitory otoacoustic emissions (TEOAE) for the identification of functional alterations at different levels from the auditory system. MATERIAL AND METHODS: 67 normal hearing subjects have been studied, we have recorded TEOAE in one ear in three different conditions: in normal conditions (SIN register), simultaneously to the stimulation of the contralateral cochlea (EAC register), and after stimulation we can observe (EAI register). We compare the amplitude of the TEOAE with the SIN and EAC registers to quantity the contralateral suppresor effect, and the SIN and EAI, register to study the auditory fatigue. RESULTS: We can observe a reduction in the amplitude of the TEOAE obtained by acoustic stimulation of the ipsilateral ear (0.954 dB SPL), or after the ipsilateral acoustic stimulation (0.75 dB SPL), being able to see an inverse correlation between both values. CONCLUSIONS: The study of the TEOAE obtained in different conditions of acoustic stimulation, ipsilateral or contralateral, and the inverse correlation obtained between the magnitude of the auditory fatigue and the contralateral suppresor effect, provides arguments for the identification of individuals susceptible of developing noise induced hearing loss.

Estudio de la correlación existente entre el efecto supresor contralateral y la fatiga auditiva mediante otoemisiones acústicas transitorias / Correlation between the contralateral supressor effect and the auditory fatigue using transitory acoustic otoemissions

Objetivos: La finalidad de este estudio es la identificación de individuos susceptibles al desarrollo de hipoacusia neurosensorial inducida por ruido. Para ello aprovechamos la capacidad de las otoemisiones acústicas transitorias (TEOAE) para la identificación de alteraciones funcionales a distintos niveles de la vía auditiva. Material y métodos: Se han estudiado 67 sujetos normooyentes, obteniendo TEOAE en un oído en tres condiciones diferentes: en condiciones habituales (Registro SIN), simultáneamente a la estimulación de la cóclea contralateral (Registro EAC), y tras la estimulación ipsilateral (Registro EAI). Comparamos la amplitud de las TEOAE de los registros SIN y EAC para la cuantificación del efecto supresor contralateral, y la de los registros SIN y EAI, para el estudio de la fatiga auditiva. Resultados: Se objetiva una reducción en la amplitud de las TEOAE obtenidas simultáneamente a una estimulación acústica contralateral (0,954 dB SPL), o tras la estimulación acústica ipsilateral (0,75 dB SPL, observándose una correlación inversa entre ambos valores. Conclusiones: El estudio de las TEOAE obtenidas en diferentes condiciones de estimulación acústica, ipsilateral o contralateral, y la correlación inversa obtenida entre la magnitud de la fatiga auditiva y el efecto supresor contralateral proporciona argumentos para la identificación de individuos susceptibles al desarrollo de hipoacusia tras la exposición al ruido

Objective: The purpose of this study is the identification of susceptible individuals to develop noise induced hearing loss. For it we use the capacity of the transitory otoacoustic emissions (TEOAE) for the identification of functional alterations at different levels from the auditory system. Material and methods: 67 normal hearing subjects have been studied, we have recorded TEOAE in one ear in three different conditions: in normal conditions (SIN register), simultaneously to the stimulation of the contralateral cochlea (EAC register), and after stimulation we can observe (EAI register). We compare the amplitude of the TEOAE with the SIN and EAC registers to quantity the contralateral suppresor effect, and the SIN and EAI, register to study the auditory fatigue. Results: We can observe a reduction in the amplitude of the TEOAE obtained by acoustic stimulation of the ipsilateral ear (0.954 dB SPL), or after the ipsilateral acoustic stimulation (0.75 dB SPL), being able to see an inverse correlation between both values. Conclusions: The study of the TEOAE obtained in different conditions of acoustic stimulation, ipsilateral or contralateral, and the inverse correlation obtained between the magnitude of the auditory fatigue and the contralateral suppresor effect, provides arguments for the identification of individuals susceptible of developing noise induced hearing loss

Carcinoma basaloide-escamoso de suelo de boca / Basosquamous cell carcinoma of the floor of the mouth

El carcinoma basaloide escamoso (CBS) o con diferenciación escamosa de cabeza y cuello, es un tumor infrecuente, descrito por Wain y colaboradores en 1986, como una entidad patológica independiente. Se han publicado más de 100 casos en cabeza y cuello, con una mayor predilección por la hipofaringe, base de la lengua y supraglotis. Esta entidad también se ha descrito en fosas nasales, esófago, amígdalas y cavidad oral. Sólo catorce casos se han comunicado asentando en el suelo de la boca y ninguno en nuestro medio. Presentamos un nuevo caso en suelo de boca y se destacan los hallazgos clinicopatológicos. Hemos realizado además una revisión bibliográfica de la literatura acerca de esta agresiva e infrecuente tumoración (AU)

Basaloid-squamous cell carcinoma is a rare tumor characterized by Wain et al in 1986 as a separate pathological entity. In head and neck more than 100 cases have been reported, with a strong predilection for hypopharynx, base of tongue, and supraglotic larynx. This entity also has been described in nasal cavity, oesophagus, tonsils and oral cavity. Only 14 cases has been reported arising in the floor of the mouth, and none in our literature. We present a new case in floor of the mouth and clinicopathological features are emphasized. We have undertaken moreover a bibliographic review of this uncommon and aggressive neoplasm (AU)

[Basosquamous carcinoma of the floor of the mouth]. / Carcinoma basaloide-escamoso de suelo de boca.

Basaloid-squamous cell carcinoma is a rare tumor characterized by Wain et al in 1986 as a separate pathological entity. In head and neck more than 100 cases have been reported, with a strong predilection for hypopharynx, base of tongue, and supraglotic larynx. This entity also has been described in nasal cavity, oesophagus, tonsils and oral cavity. Only 14 cases has been reported arising in the floor of the mouth, and none in our literature. We present a new case in floor of the mouth and clinicopathological features are emphasized. We have undertaken moreover a bibliographic review of this uncommon and aggressive neoplasm.