Prevalência de alterações das células ciliadas externas em estudantes de uma escola do Distrito Federal

Abstract

Exposure to loud music is increasing among young people, and so could be the number of hearing impairment cases in this population. Otoacoustic emission tests are sensitive in capturing the effects of exposure to noise, and allow the detection of early cochlear disorders.Objective: This study aims to look into the prevalence rates of injuries to outer hair cells in a population of students through otoacoustic emission testing. Materials and Method:One-hundred and thirty-four subjects were submitted to transient evoked and distortion product otoacoustic emission tests. Subjects were assessed on a "pass/fail" scale. This is a cross-sectional descriptive study on prevalence rates.Results: More than four fifths (80.6%) of the 134 subjects had altered transient otoacoustic emissions, most of whom were males; 97.8% had altered distortion product otoacoustic emissions and 79.9% had altered test results in both transient evoked and distortion product OAEs; most were males; 94.0% reported they used earphones; and 82.8% stated they frequented places where loud music was played. Conclusion:The high prevalence rates of altered test results seem to indicate the presence of early cochlear disorders in the studied subjects. A significant number of subjects reported exposure to loud music, a habit that may be conducive to the onset of cochlear disorders. Braz J Otorhinolaryngol. 2012;78(4):91-7. ORIGINAL ARTICLE BJORL.org

Electroacoustic and electrophysiological auditory assessment in aphasic individuals

“…Therefore, the ears differed in amplitude in the research both with and without noise (Table 1); greater amplitude was observed in the right ear in both conditions. These findings confirmed data from the literature, which described greater TEOAE amplitudes in the right ear, as well as in female individuals 19,20 . Hence, even with the neurological injury, the individuals of the SG had results similar to those observed in people without this alteration.…”

Hearing habits of young adolescent students from public and private schools in the Brazilian Federal District

“…Previous research 6 found that most of the sample (94%) used earphones, and a considerable number of them (79%) had abnormal results in the examinations that assessed cochlear cell functioning. However, the authors deemed it necessary to conduct a study in further detail to investigate these young people's hearing habits concerning the frequency and time of device use and attendance at places with amplified music.…”

“…Other studies approaching other types of hearing habits among young people pointed out that listening to music in earphones is the most frequent one 1,[4][5][6][7][8]11 . These data corroborate the findings in the present study and possibly reflect the lack of awareness among young people of the problem posed by this type of noise and its effects.…”

“…A study 6 has indicated the high prevalence of changes in outer hair cells in young people who use earphones, although it did not clarify the consequences according to the degree and time of exposure.…”

“…Sounds around 130 dB SPL can damage the hearing system. Such excessive exposure can cause noise-induced hearing loss, also known as sensorineural hypoacusis, which is considered an irreversible chronic disease that affects the hearing system and has other consequences 3,6 .…”