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Otoacoustic emissions as an instrument of epidemiological surveillance in the health of the workers  [cached]
Oliveira, Priscila Feliciano de,Raposo, Oscar Felipe Falc?o,Santos, Any Caroline Arag?o dos,Santos, Luana Araujo dos
International Archives of Otorhinolaryngology , 2011,
Abstract: Introduction: The noise is a harmful agent to the hearing, being frequent in urban and work environments. Among the structures of the hearing system, the outer hair cells are the first to be injured, and otoacoustic emissions identify minimal cochlear alterations. Objective: Analyze cochlear alterations with otoacoustic emissions transient evoked in individuals exposed to combined risk: noise and chemical products. Method: 49 workers of a cement company participated of the research, aged between 19 and 49 years old, exposure time of at least two years and normal hearing thresholds. Was performed an anamnesis and otoacoustic emissions before and post work activity. The results of the exam were related with the variable: time of exposure to the noise, age, exposure to chemical products and sound habits. The statistical tests used were: T of Student, chi-squared Pearson test and Fisher's exact test and is characterized by a prospective clinical study. Results: At the first testing, had presence of emissions in all of the workers. The average of amplitude is of 10,22 dBSPL in the right ear and 9,48 dBSPL in the left ear. In the second testing there were a variation of 0,69 dBSPL in the lef ear and 0,42 dBSPL in the right ear, of which 79,6% of individuals had presence of emission bilaterally and 20,4% absence in at least one ear. Analyzing the relation between variations of emissions with the variable was not observed statistically significant data. Conclusion: The otoacoustic emissions in the workers health search to prevent the damage to the hearing system through cochlear changings.
Perfil audiométrico e de emiss es otoacústicas evocadas por produto de distor o em gestores de transito expostos a monóxido de carbono e ruído Audiometric profile and evoked otoacoustic emissions per product of distortion in transit managers, exposed to carbon monoxide and noise  [cached]
Soraya de Carvalho Rocha,Renata Gomes dos Santos,Silvana Frota
Revista CEFAC , 2013, DOI: 10.1590/s1516-18462013005000004
Abstract: OBJETIVO: avaliar o perfil audiométrico e de emiss es otoacústicas evocadas por produto de distor o em gestores de transito, expostos a monóxido de carbono e ruído, bem como constatar a presen a de ambos agentes nos postos de trabalho. MéTODO:estudo transversal, descritivo, com 37 gestores do transito, submetidos a anamnese, meatoscopia, audiometria tonal e emiss es otoacústicas, distribuídos em: G1, composto por 18 indivíduos sem histórico de exposi o concomitante a monóxido de carbono e ruído; e, G2, formado por 19 trabalhadores expostos simultaneamente aos dois agentes. Para pesquisa da presen a dos agentes no ambiente foram utilizadas audiodosímetrias e avalia es de curta dura o com medidor instantaneo. As variáveis de anamnese foram analisadas segundo o teste t Student e Mann-Whitney. Para as medidas de otoemiss es acústicas e de limiares tonais utilizou-se testes de qui-quadrado (χ2) ou exato de Fisher e dos postos sinalizados de Wilcoxon com significancia de 5%. RESULTADOS: foi constatada presen a de monóxido de carbono e ruído durante a atividade dos trabalhadores. N o foi observada diferen a significante na idade e tempo de fun o. O G2 obteve média de limiares tonais maior que G1, para orelha direita, em 1KHz (p=0,050) e para orelha esquerda em 3KHz (p=0,016) e 4KHz (p=0,028); e, comparados os limiares tonais alterados G2 apresentou diferen a maior em 3KHz na orelha esquerda (p=0,003). Nas emiss es otoacústicas, G2 apresentou maior ausência de respostas que G1 em 2.730Hz e 3.218Hz (p=0.016) para orelha direita. CONCLUS O: trabalhadores expostos a monóxido de carbono e ruído apresentaram piores resultados audiométricos e nas emiss es otoacústicas quando comparado ao grupo de n o expostos. PURPOSE: to evaluate the hearing profile and otoacoustic emission evoked by distortion product in Traffic Managers exposed to noise and carbon monoxide, as well as to establish the presence of both agents at their work environment. METHOD: 37 workers were divided into two groups: G1 formed by 18 individuals with no history of concomitant exposure to carbon monoxide and noise, and G2 formed by 19 workers simultaneously exposed to both agents. To determine the presence of those agents, audio dosimeter and short period evaluation with instantaneous measurement were used. The variances of anamnesis were studied applying the Student t test and Mann-Whitney test. Otoacoustics emissions and auditory thresholds were analyzed by chi-square or Fisher exact and Wilcoxon test with 5% significance. RESULTS: it was verified the presence of carbon monoxide and noise duri
Perfil audiométrico e de emiss es otoacústicas evocadas por produto de distor o em gestores de transito expostos a monóxido de carbono e ruído Audiometric profile and evoked otoacoustic emissions per product of distortion in transit managers, exposed to carbon monoxide and noise  [cached]
Soraya de Carvalho Rocha,Renata Gomes dos Santos,Silvana Frota
Revista CEFAC , 2013,
Abstract: OBJETIVO: avaliar o perfil audiométrico e de emiss es otoacústicas evocadas por produto de distor o em gestores de transito, expostos a monóxido de carbono e ruído, bem como constatar a presen a de ambos agentes nos postos de trabalho. MéTODO:estudo transversal, descritivo, com 37 gestores do transito, submetidos a anamnese, meatoscopia, audiometria tonal e emiss es otoacústicas, distribuídos em: G1, composto por 18 indivíduos sem histórico de exposi o concomitante a monóxido de carbono e ruído; e, G2, formado por 19 trabalhadores expostos simultaneamente aos dois agentes. Para pesquisa da presen a dos agentes no ambiente foram utilizadas audiodosímetrias e avalia es de curta dura o com medidor instantaneo. As variáveis de anamnese foram analisadas segundo o teste t Student e Mann-Whitney. Para as medidas de otoemiss es acústicas e de limiares tonais utilizou-se testes de qui-quadrado (χ2) ou exato de Fisher e dos postos sinalizados de Wilcoxon com significancia de 5%. RESULTADOS: foi constatada presen a de monóxido de carbono e ruído durante a atividade dos trabalhadores. N o foi observada diferen a significante na idade e tempo de fun o. O G2 obteve média de limiares tonais maior que G1, para orelha direita, em 1KHz (p=0,050) e para orelha esquerda em 3KHz (p=0,016) e 4KHz (p=0,028); e, comparados os limiares tonais alterados G2 apresentou diferen a maior em 3KHz na orelha esquerda (p=0,003). Nas emiss es otoacústicas, G2 apresentou maior ausência de respostas que G1 em 2.730Hz e 3.218Hz (p=0.016) para orelha direita. CONCLUS O: trabalhadores expostos a monóxido de carbono e ruído apresentaram piores resultados audiométricos e nas emiss es otoacústicas quando comparado ao grupo de n o expostos. PURPOSE: to evaluate the hearing profile and otoacoustic emission evoked by distortion product in Traffic Managers exposed to noise and carbon monoxide, as well as to establish the presence of both agents at their work environment. METHOD: 37 workers were divided into two groups: G1 formed by 18 individuals with no history of concomitant exposure to carbon monoxide and noise, and G2 formed by 19 workers simultaneously exposed to both agents. To determine the presence of those agents, audio dosimeter and short period evaluation with instantaneous measurement were used. The variances of anamnesis were studied applying the Student t test and Mann-Whitney test. Otoacoustics emissions and auditory thresholds were analyzed by chi-square or Fisher exact and Wilcoxon test with 5% significance. RESULTS: it was verified the presence of carbon monoxide and noise duri
Tone burst evoked otoacoustic emissions in neonates
Soares, Jordana Costa;Carvallo, Renata Mota Mamede;
Brazilian Journal of Otorhinolaryngology , 2009, DOI: 10.1590/S1808-86942009000300021
Abstract: a potential research project in otoacoustic emissions is the use tone bursts - frequency-specific stimulus. aim:to study otoacoustic emission responses evoked by tone bursts in neonates with hearing loss risk factors. materials and methods: 21 neonates with risk factors for hearing loss (study group) and 30 neonates without these risk factors (control group) were evaluated by otoacoustic emissions at the frequency range of 2,000 and 4,000 hertz. study: clinical and experimental. results: there was a right ear advantage in female individuals and in the control group, although without statistical significance. mean "response" values at 2,000 hertz were 17.73 db in the control group and 16.55 db in the study group for female subjects; and 16.63 db in the control group and 16.12 db in the study group for male subjects. at 4,000 hertz, the values were 14.63 db in the control group and 15.09 db in the study group for female subjects; and 18.57 db in the control group and 15.06 db in the study group for male subjects. conclusion: tone bursts may help evaluate cochlear function in neonates.
Transiently Evoked Otoacoustic Emissions in Children with Otitis Media with Effusion  [PDF]
Dimitris G. Balatsouras,George Koukoutsis,Panayotis Ganelis,George S. Korres,Andreas Aspris,Antonis Kaberos
International Journal of Otolaryngology , 2012, DOI: 10.1155/2012/269203
Abstract: Introduction. Otitis media with effusion is a common pediatric disease whose diagnosis is based on pneumatic otoscopy, pure-tone audiometry, and tympanometry. The aim of this study was to evaluate transiently evoked otoacoustic emissions in the diagnosis of otitis media with effusion as compared to tympanometry. Patients and Methods. 38 children with bilateral otitis media with effusion were studied. 40 normal children of similar age and sex were used as controls. All subjects underwent pneumatic otoscopy, standard pure-tone audiometry, tympanometry, and transiently evoked otoacoustic emissions. Results. In the group of children with bilateral otitis media, transiently evoked otoacoustic emissions were absent in 51 ears (67%). In the remaining 25 ears (33%) the mean emission amplitude was reduced, as compared to the mean value of the control group. Conclusions. Transiently evoked otoacoustic emissions should be included in the diagnostic workup of otitis media with effusion because it is a fast, reliable, and objective test. Transiently evoked otoacoustic emissions should always be used in conjunction with tympanometry, because a more meaningful interpretation of transiently evoked otoacoustic emissions measures is possible.
Transient evoked otoacoustic emissions otologically in normal adults
Mowafaq Al-Qhaiwi
Nigerian Journal of Surgical Research , 2005,
Abstract: Objective: To examine the effects of aging on the existence of transient evoked otoacoustic emissions in normal adult. Material and methods: 40 subjects (30 males, 10 females) aged between 20-60 years were divided into 4 groups by representing. All patients were screened to insure otologically normal subjects based on history and otological examination and tympanometry. Examined was done in the KHMC between 1999-2000 using a manually Operated Madson Audiometer, and the IL 088 otodynamic Analyser was used to record transient otoacoustic emission. Results: The age groups were 20-30,31-40, 41-50, 51-60 years .There was no significant difference in threshold as a function of age at p<0.05 .The TEOAE amplitude as function of audiometric threshold between (0-20db hl) was not significant. Conclusion: Age appears to have no effect on TEOAE level when the degree at hearting is within normal. Nigerian Journal of Surgical Research Vol. 7(1&2) 2005: 162-163
Transiently Evoked Otoacoustic Emissions in Children with Otitis Media with Effusion  [PDF]
Dimitris G. Balatsouras,George Koukoutsis,Panayotis Ganelis,George S. Korres,Andreas Aspris,Antonis Kaberos
International Journal of Otolaryngology , 2012, DOI: 10.1155/2012/269203
Abstract: Introduction. Otitis media with effusion is a common pediatric disease whose diagnosis is based on pneumatic otoscopy, pure-tone audiometry, and tympanometry. The aim of this study was to evaluate transiently evoked otoacoustic emissions in the diagnosis of otitis media with effusion as compared to tympanometry. Patients and Methods. 38 children with bilateral otitis media with effusion were studied. 40 normal children of similar age and sex were used as controls. All subjects underwent pneumatic otoscopy, standard pure-tone audiometry, tympanometry, and transiently evoked otoacoustic emissions. Results. In the group of children with bilateral otitis media, transiently evoked otoacoustic emissions were absent in 51 ears (67%). In the remaining 25 ears (33%) the mean emission amplitude was reduced, as compared to the mean value of the control group. Conclusions. Transiently evoked otoacoustic emissions should be included in the diagnostic workup of otitis media with effusion because it is a fast, reliable, and objective test. Transiently evoked otoacoustic emissions should always be used in conjunction with tympanometry, because a more meaningful interpretation of transiently evoked otoacoustic emissions measures is possible. 1. Introduction Otitis media with effusion is a common pediatric disease and is considered the most common cause of hearing impairment among children [1]. Diagnosis is mainly based on pneumatic otoscopy, pure-tone audiometry, and tympanometry. Tympanometry is an objective technique that can detect abnormal middle-ear function consistent with the presence of fluid in the middle-ear cavity [2]. Transiently evoked otoacoustic emissions (TEOAEs) are a diagnostic method widely used during the past decade to study cochlear function, in a noninvasive and objective manner. Usually, TEOAEs are present in people who have normal cochlear function and a healthy middle ear [3]. Although extensive experience from the use of TEOAEs in widespread neonatal hearing screening has been gained [4], little data has been gathered from the population of preschool and school-aged children. Because otoacoustic emissions are transmitted from the cochlea to the external ear canal via the middle ear, the transmission properties of the middle ear directly influence their characteristics. In general, middle-ear effusion reduces measured emission amplitudes and sometimes eliminates the response entirely [5]. The aim of this study was to evaluate TEOAEs in the diagnosis of otitis media with effusion in comparison with tympanometry. 2. Material and Methods A group
Tone burst-evoked otoacoustic emissions in neonates: normative data
Vicky Wei Zhang, Bradley McPherson, Zhi-Guo Zhang
BMC Ear, Nose and Throat Disorders , 2008, DOI: 10.1186/1472-6815-8-3
Abstract: A total of 395 normal neonates (745 ears) were recruited. The study consisted of two parts, reflecting the two study aims. Part I included 40 normal neonatal ears, and TBOAE measurement was performed at five stimulus levels in the range 60–80 dB peSPL, with 5 dB incremental steps. Part II investigated the characteristics of the 1 kHz TBOAE response in a large group of 705 neonatal ears, and provided clinical reference criteria based on these characteristics.The study provided a series of reference parameters for 1 kHz TBOAE measurement in neonates. Based on the results, a suggested stimulus level and reference criteria for 1 kHz TBOAE measures with neonates were established. In addition, time-frequency analysis of the data gave new insight into the energy distribution of the neonatal TBOAE response.TBOAE measures may be a useful method for investigating cochlear function at specific frequency ranges in neonates. However, further studies of both TBOAE time-frequency analysis and measurements in newborns are needed.Click evoked otoacoustic emissions (CEOAEs), as one type of transient evoked otoacoustic emission (TEOAE), have been widely used to assess the functioning of cochlear outer hair cells. Since the CEOAE click stimulus has a broad spectrum, and consequently can stimulate a broad frequency region of the cochlea in a single measurement, CEOAE measurement has been especially applied as a general tool in universal neonatal hearing screening (UNHS) programs. Another type of TEOAE – tone burst evoked OAEs (TBOAEs) – uses narrow bandwidth tone stimuli. This allows stimulus energy to be concentrated on a particular area of the basilar membrane and elicits a more frequency-specific cochlear response [1,2]. Fourier analysis of TBOAEs indicates that emission spectra are similar to that of the tone burst stimulus [3-5]. As to the research and clinical application of TBOAEs, studies have mainly focused on adult populations, and have been undertaken by few authors.Compared
Effects of changes in dynamic characteristics of the middle ear on transient-evoked otoacoustic emissions  [PDF]
?piri? Sanja,?piri? Predrag,Vranje? Dalibor,Aleksi? Aleksandra
Medicinski Pregled , 2011, DOI: 10.2298/mpns1110439s
Abstract: Transient-evoked otoacoustic emissions are transmitted through the middle ear. The purpose of this study was to investigate the effects of dynamic properties of the transmission system on the measurability of transient otoacoustic emissions. The authors analyzed the presence of transient otoacoustic emissions in 48 children with serous otitis media regarding the tympanogram, presence and type of effusion and pure tone average findings. The results obtained in this research show the predominant absence of transient otoacoustic emissions in patients with type B tympanogram (69.1%) especially if the effusion is mucoid (77.5%) with the hearing loss of 15 decibel hearing level. This research shows that disorders in dynamic characteristics of the middle ear in patients with serous otitis obstruct the transmission of acoustic energy and affect the measurability of transient otoacoustic emissions, especially if the effusion is mucoid and hearing loss of 15 decibel hearing level.
Analysis of transient otoacoustic emissions and brainstem evoked auditory potentials in neonates with hyperbilirubinemia
Silva, Daniela Polo Camargo da;Martins, Regina Helena Garcia;
Brazilian Journal of Otorhinolaryngology , 2009, DOI: 10.1590/S1808-86942009000300013
Abstract: hyperbilirubinemia is toxic to the auditory pathways and to the central nervous system, leaving sequelae such as hearing loss and encephalopathy. aim: to assess the hearing of neonates with hyperbilirubinemia, using transient evoked otoacoustic emissions (toaes) and brainstem evoked auditory potentials (beap). prospective study. materials and methods: we had two groups: gi (n-25), neonates with hyperbilirubinemia; gii (n-22), neonates without hyperbilirubinemia and without risk factors for hearing loss. all the neonates had up to 60 days of life and were submitted to toae and beap. results: 12 neonates from gi and 10 from gii were girls and 13 from gi and 12 from gii were boys. toaes were present in all the children, however with lower amplitudes in gi, especially in the frequencies of 2 and 3khz (p < 0.05). regarding the beap, we observed a mild pv and li-v increase in bi. the alterations observed in these tests do not correlate to the serum levels of bilirubin. conclusions: in neonates with hyperbilirubinemia, we noticed lower toae amplitudes and mild pv and li-v increase, indicating cochlear and retrocochlear disorders, stressing the importance of using both tests and carefully reading them in these evaluations.
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