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Abstract
The purpose of this study was to measure changes in intensity and pitch matches to better assess disease activity in fluctuating hearing loss. Long-term suprathreshold audiometry was carried out at home on a subject with a unilateral fluctuating low-frequency hearing loss during a period when the subject demonstrated no symptoms and a period when the subject reported hearing loss, aural pressure, and tinnitus. Daily measurements of binaural intensity and pitch matches were made. Day-to-day fluctuations were clearly accentuated during the period when the subject experienced symptoms. Specifically, deviations from the reference tone were only observed for binaural pitch matches at 1 kHz during the period without symptoms; however, highly fluctuating binaural intensity and pitch matches were observed at 0.25 kHz during the period with symptoms. These fluctuations were not observed in a normal-hearing group. The results suggest that long-term measurements of binaural intensity and pitch matches can be used to monitor disease activity in fluctuating low-frequency hearing loss.
| Abbreviations | ||
| FFT | = | Fast Fourier transform |
| FLFHL | = | Fluctuating low-frequency hearing loss |
| PTC | = | Psychophysical tuning curves |
| PSE | = | Point of subjective equality |
| DF | = | Degrees of freedom |
| Abbreviations | ||
| FFT | = | Fast Fourier transform |
| FLFHL | = | Fluctuating low-frequency hearing loss |
| PTC | = | Psychophysical tuning curves |
| PSE | = | Point of subjective equality |
| DF | = | Degrees of freedom |
Sumario
El propósito de este estudio fue medir los cambios en combinaciones de intensidad y de tono para la mejor evaluación de la actividad de la enfermedad en la hipoacusia fluctuante. Se llevó a cabo, a largo plazo, audiometrías supraumbrales en la casa de un sujeto con hipoacusia unilateral fluctuante de baja frecuencia, durante un periodo en el que el sujeto no demostraba síntomas y en otro periodo cuando sí reportaba hipoacusia, plenitud aural y acufeno. Se realizaron mediciones diarias de intensidad binaural y emparejamiento de tonos. Las fluctuaciones diarias se acentuaron claramente durante el periodo en el que el sujeto experimentó síntomas. Específicamente sólo se observaron desviaciones del tono de referencia al emparejar binauralmente tonos a 1 kHz en el periodo sin síntomas; sin embargo, se observó una alta fluctuación de la intensidad binaural y del emparejamiento de tono a 0.25 kHz durante el periodo sintomático. Estas fluctuaciones no se observaron en el grupo de normoyentes. Los resultados sugieren que las mediciones a largo plazo de la intensidad binaural y del emparejamiento de tono pueden ser utilizadas para monitorear la actividad de la enfermedad en la hipoacusia fluctuante de tonos graves.