Dayane Domeneghini Didoné

Auditory Evoked Potentials with Different Speech Stimuli: a Comparison and Standardization of Values

Introduction Long Latency Auditory Evoked Potentials (LLAEP) with speech sounds has been the subject of research, as these stimuli would be ideal to check individualś detection and discrimination. Objective The objective of this study is to compare and describe the values of latency and amplitude of cortical potentials for speech stimuli in adults with normal hearing. Methods The sample population included 30 normal hearing individuals aged between 18 and 32 years old with ontological disease and auditory processing. All participants underwent LLAEP search using pairs of speech stimuli (/ba/ x /ga/, /ba/ x /da/, and /ba/ x /di/. The authors studied the LLAEP using binaural stimuli at an intensity of 75dBNPS. In total, they used 300 stimuli were used (∼60 rare and 240 frequent) to obtain the LLAEP. Individuals received guidance to count the rare stimuli. The authors analyzed latencies of potential P1, N1, P2, N2, and P300, as well as the ampleness of P300. Results The mean age of the group was approximately 23 years. The averages of cortical potentials vary according to different speech stimuli. The N2 latency was greater for /ba/ x /di/ and P300 latency was greater for /ba/ x /ga/. Considering the overall average amplitude, it ranged from 5.35 and 7.35uV for different speech stimuli. Conclusion It was possible to obtain the values of latency and amplitude for different speech stimuli. Furthermore, the N2 component showed higher latency with the / ba / x / di / stimulus and P300 for /ba/ x / ga /.

Long-latency auditory evoked potentials with verbal and nonverbal stimuli,

INTRODUCTION Long-latency auditory evoked potentials represent the cortical activity related to attention, memory, and auditory discrimination skills. Acoustic signal processing occurs differently between verbal and nonverbal stimuli, influencing the latency and amplitude patterns. OBJECTIVE To describe the latencies of the cortical potentials P1, N1, P2, N2, and P3, as well as P3 amplitude, with different speech stimuli and tone bursts, and to classify them in the presence and absence of these data. METHODS A total of 30 subjects with normal hearing were assessed, aged 18-32 years old, matched by gender. Nonverbal stimuli were used (tone burst; 1000Hz - frequent and 4000Hz - rare); and verbal (/ba/ - frequent; /ga/, /da/, and /di/ - rare). RESULTS Considering the component N2 for tone burst, the lowest latency found was 217.45ms for the BA/DI stimulus; the highest latency found was 256.5ms. For the P3 component, the shortest latency with tone burst stimuli was 298.7 with BA/GA stimuli, the highest, was 340ms. For the P3 amplitude, there was no statistically significant difference among the different stimuli. For latencies of components P1, N1, P2, N2, P3, there were no statistical differences among them, regardless of the stimuli used. CONCLUSION There was a difference in the latency of potentials N2 and P3 among the stimuli employed but no difference was observed for the P3 amplitude.

Long Latency Auditory Evoked Potential in Term and Premature Infants

Introduction The research in long latency auditory evokes potentials (LLAEP) in newborns is recent because of the cortical structure maturation, but studies note that these potentials may be evidenced at this age and could be considered as indicators of cognitive development. Purpose To research the exogenous potentials in term and premature infants during their first month of life. Materials and Methods The sample consisted of 25 newborns, 15 term and 10 premature infants. The infants with gestational age under 37 weeks were considered premature. To evaluate the cortical potentials, the infants remained in natural sleep. The LLAEPs were researched binaurally, through insertion earphones, with frequent /ba/ and rare /ga/ speech stimuli in the intensity of 80 dB HL (decibel hearing level). The frequent stimuli presented a total of 80% of the presentations, and the rare, 20%. The data were statistically analyzed. Results The average gestational age of the term infants was 38.9 weeks (± 1.3) and for the premature group, 33.9 weeks (± 1.6). It was possible to observe only the potentials P1 and N1 in both groups, but there was no statistically significant difference for the latencies of the components P1 and N1 (p > 0.05) between the groups. Conclusion It was possible to observe the exogenous components P1 and N1 of the cortical potentials in both term and preterm newborns of no more than 1 month of age. However, there was no difference between the groups.

Refluxo laringofaríngeo e bulimia nervosa: alterações vocais e larínegas

TEMA: Caracteristicas da bulimia nervosa (BN) e do Refluxo Laringofaringeo (RLF) e alteracoes vocais e laringeas que podem decorrer da exposicao da laringe ao acido gastrico. OBJETIVO: Descrever, por meio de revisao de literatura, as caracteristicas do RLF e da BN, relacionando-os com as alteracoes vocais e laringeas que podem se originar da exposicao da laringe ao acido gastrico que ocorre em ambas as condicoes. CONCLUSAO: A BN se caracteriza por um transtorno alimentar de causa principalmente psicologica em que ocorre ingestao compulsiva de grande quantidade de alimentos, seguida de episodios de vomitos auto-induzidos com a finalidade de evitar o ganho de peso. O RLF consiste em uma variacao clinica da DRGE, na qual o fluxo retrogrado do alimento e do acido gastrico entra em contato com a laringe e suas estruturas. Em comum, a BN e o RLF apresentam este mecanismo de regurgitacao que pode atingir a laringe. Dentre os sinais e sintomas laringeos e vocais decorrentes da regurgitacao do acido gastrico sobre a laringe estao: globus faringeo, disfonia, rouquidao, tosse seca, disfagia, halitose, lesoes inflamatorias nas pregas vocais, laringite, amigdalite, edema e eritema glotico posterior e ou de aritenoides, da regiao retrocricoidea e interaritenoidea, estenose subglotica, irregularidades na mucosa das pregas vocais, hipertrofia de mucosa laringea, leucoplasia, carcinoma, laringoespasmos, granulomas, ulcera de contato, nodulos vocais, polipos vocais, edema difuso, granuloma, fixacao uni ou bilateral de aritenoides, edema de Reinke, laringomalacia, estridor, e odinofagia.

Função do sistema olivococlear medial em crianças com desvio fonológico

PURPOSE To verify whether children with phonological disorders present alterations in the medial olivocochlear system. METHODS This is a prospective cross-sectional study in which 19 normal hearing children of both genders, with ages between 4 and 7 years, were divided into two groups: 11 children without phonological disorders (control group) and eight with phonological disorders (study group). The auditory condition was verified by visual examination of the external ear canal, pure tone audiometry, and tympanometry. The study included only children with hearing thresholds below or equal to 15 dB, type A tympanometry, and presence of acoustic reflexes. To evaluate the function of the medial olivocochlear system, it was carried out the evaluation of transient evoked otoacoustic emissions (TEOAE) with and without contralateral white noise at 60 dBHL. Data were statistically analyzed. RESULTS The occurrence and average values of TEOAE suppression in right and left ears did not present differences in the frequencies of 1, 2, 3 and 4 kHz within groups. In the comparison of the mean and the occurrence of the suppressive effect of TEOAE between control and study groups, there was also no difference in the frequencies analyzed. CONCLUSION Children with phonological disorders do not present alterations in the medial olivocochlear system, as evidenced by the occurrence of the suppressive effect of transient evoked otoacoustic emissions.

Auditory evoked potential P300 in adults: reference values

ABSTRACT Objective To establish reference intervals for cognitive potential P300 latency using tone burst stimuli. Methods This study involved 28 participants aged between 18 and 59 years. P300 recordings were performed using a two-channel device (Masbe, Contronic). Electrode placement was as follows: Fpz (ground electrode), Cz (active electrode), M1 and M2 (reference electrodes). Intensity corresponded to 80 dB HL and frequent and rare stimulus frequencies to 1,000Hz and 2,000Hz, respectively. Stimuli were delivered binaurally. Results Mean age of participants was 35 years. Average P300 latency was 305ms. Conclusion Maximum acceptable P300 latency values of 362.5ms (305 + 2SD 28.75) were determined for adults aged 18 to 59 years using the protocol described.

CARACTERIZAÇÃO DOS CANDIDATOS AO USO DE PRÓTESES AUDITIVAS EM UM SERVIÇO DE SAÚDE AUDITIVA REGIONAL DO ESTADO DO RIO GRANDE DO SUL

Introduction – The National Health Care System (SUS) provides a concierge hearing care focused on providing hearing aids. This ordinance seeks rehabilitation of subjects in different age groups in all types and degrees of hearing loss. Objective – To characterize users Sector Hearing a Specialty Center and Diagnostics central region of Rio Grande do Sul. Material and Method – This is a quantitative, retrospective and documentary. The target population of this research consisted of all candidates for the use of hearing aids in the period 2000-2010. Results – The predominant group of adults and seniors with elementary school, receiving up to two minimum wages. The professions “retired” and “home” predominated in the sample. Conclusion – The main characteristics of the subjects in this study were adults and seniors with elementary school, retired or housewives, they receive up to two minimum wages.