Comparison of ocular vestibular myogenic response by acoustic stimulation at 500 and 1000 Hz in healthy subjects.

OBJECTIVE: To compare the amplitude of potentials by acoustic stimulation at 500 Hz versus 1000 Hz in healthy subjects. METHODS: 25 subjects; potentials were performed with acoustic stimuli burst-type at 500 and 1000 Hz with a stimulation rate of 5.1 at 100 dB in both ears. Descriptive statistics tests were performed, confidence intervals were calculated for the mean with 95% reliability, standard error graphs and t-test for related samples. RESULTS: The values obtained in amplitude when performing an acoustic stimulus at 1000 Hz show a faster response compared to that obtained in the frequency of 500 Hz. The t-test showed a significant difference in the amplitude in the 1000 Hz frequency between ears with a significance value of p < 0.025. CONCLUSIONS: It is strengthened the hypothesis that in the amplitude of potentials by aerial acoustic stimulation in the frequency of 1000 Hz a greater amplitude is generated in relation to the one generated in the frequency of 500 Hz.

OBJETIVO: Comparar la amplitud de los potenciales miogénicos vestibulooculares por estimulación acústica a 500 y 1000 Hz en sujetos sanos. MÉTODO: Se estudiaron 25 sujetos y se realizaron potenciales con estímulos acústicos tipo burst a 500 y 1000 Hz con una tasa de estimulación de 5.1 a 100 dB en ambos oídos. Se realizaron pruebas de estadística descriptiva y se calcularon los intervalos de confianza para la media con un 95% de confiabilidad, las gráficas de error estándar y la prueba t para muestras relacionadas. RESULTADOS: Los valores obtenidos en amplitud al realizar estímulo acústico a 1000 Hz muestran una respuesta más rápida en comparación con la obtenida en la frecuencia de 500 Hz. La prueba t mostró una diferencia significativa en la amplitud en la frecuencia 1000 Hz entre oídos, con un valor de significancia p < 0.025. CONCLUSIONES: Se fortalece la hipótesis de que en los potenciales por estimulación acústica aérea en la frecuencia de 1000 Hz se genera una mayor amplitud en relación con la generada en la frecuencia de 500 Hz.

Acoustic analysis of voice in children with cleft lip and palate following vocal rehabilitation. Preliminary report.

BACKGROUND: Cleft lip and palate (CLP) is the most common craniofacial anomaly. CLP affects resonance, voice and speech. Besides the most frequently reported resonance and speech disorders, several reports have addressed acoustic abnormalities in the voice of patients with CLP. However, there are just a few reports focusing on vocal treatment in this population. OBJECTIVE: To study whether a Speech and Language Pathology (SLP) intervention including vocal rehabilitation for children with CLP and velopharyngeal insufficiency (VPI) provides significant improvement of abnormal acoustic parameters of voice. MATERIAL AND METHODS: Fifteen children with cleft lip and palate (CLP) and velopharyngeal insufficiency (VPI) were studied. Age ranged 4-5 years. A matched control group of children without craniofacial anomalies and adequate speech, resonance and voice was assembled. All children underwent acoustic analysis of voice at the onset and at the end of SLP intervention including vocal rehabilitation. RESULTS: Hypernasality persisted unchanged following SLP intervention. Mean Fundamental Frequency (F0) did not demonstrate a significant difference between the control and the active groups. At the onset of the intervention mean shimmer and jitter were significantly higher in all patients with CLP as compared to controls. At the end of the intervention shimmer and jitter significantly decreased in patients with CLP showing no differences as compared to controls. CONCLUSION: SLP intervention including vocal rehabilitation improves abnormal acoustic parameters of voice. Besides surgical treatment for VPI the SLP intervention in children with CLP should also address vocal rehabilitation.