جستجوی مقالات مرتبط با کلیدواژه "auditory steady-state response" در نشریات گروه "پزشکی"

 Pure-tone audiometry (PTA) is the most common audiological test to determine hearing thresholds. However, accurate assessment of hearing in difficult-to-test populations has always remained an audiological challenge as it gives inconsistent responses in PTA.

 The aim of this study was to evaluate the reliability of the Auditory Steady State Response (ASSR) and Auditory Brainstem Response (ABR) in determining the frequency specific hearing thresholds by establishing a correlation between the thresholds determined by subjective test- PTA and objective test - ASSR and ABR at 500 Hz, 1 kHz, 2 kHz and 4 kHz.

 In this prospective study we have included 40 adult subjects (n = 80 ears) of both genders. All subjects underwent ASSR, tone burst ABR and PTA to record frequency specific hearing thresholds at 500 Hz, 1 kHz, 2 kHz and 4 kHz. Data were recorded and analyzed with SPSS IBM software version 22.

 Mean difference between PTA - ASSR was 14.2 dB and between PTA - ABR was 18.8 dB in the study population. We found a strong correlation between PTA-ASSR and PTA-ABR across all frequencies. We also confirmed that correlation was better in the sensorineural hearing loss and conductive hearing loss group in comparison with the normal hearing group. The overall reliability was better in high frequency for both ASSR and ABR.

 Results of this study concluded that both ABR and ASSR can be used to predict frequency specific hearing thresholds. ASSR was more reliable than ABR for accurate prediction of frequency specific hearing threshold as the mean difference between ASSR and PTA was smaller than the mean difference between ABR and PTA.

congenital severe to profound sensorineural hearing loss (SP-SNHL) causes serious difficulties in production and comprehension of speech, necessitates use of a thorough rehabilitation program at early age. The aim of this study was to evaluate the relationship between hearing thresholds and the result of auditory rehabilitation in children with bilateral congenital SP-SNHL.  

This is a retrospective study. Thirty-five children (23 males and 12 females) with bilateral congenital SP-SNHL were evaluated based on Auditory Steady-State Response (ASSR). The mean age of children at the beginning of rehabilitation was 37.36 (±17.10) months. They received bilateral superpower hearing aids and auditory rehabilitation based on Auditory-Verbal Therapy (AVT) approach. Their Speech production and comprehension were assessed at the beginning and end of rehabilitation via Speech Intelligibility Rating (SIR) and Categories of Auditory Performance (CAP).

The SIR and CAP scores showed improvement in 12 (34.3%) and 25 (71.4%) children, respectively. These children had lower ASSR thresholds in 0.5 to 4 k Hz relative to others. The mean ASSR thresholds were 85.63 to 97.50 versus 96.09 to 104.75 (p < 0.05). Also, lower hearing thresholds were related to better results in auditory rehabilitation (p < 0.05).

Lower hearing thresholds in children with SP-SNHL are associated with better rehabilitation results.

Auditory steady-state response (ASSR) is a test for the estimation of auditory thresholds. It is used in infants, children, and adults. This case report presented unusual ASSR results in an elderly person.

Pure tone and speech audiometry, tympanometry and acoustic reflexes showed a moderate sensorineural hearing loss in both ears. However, the patient did not respond in the ASSR test to different carrier frequencies with frequency modulations of 40 and 80 Hz.

To date, the results of the different effects of the aging process obtained from ASSR responses have been reported. However, the absence of any response in the ASSR test has never been reported. The patient in this case report may have these results because of a neural deficit.

Auditory steady-state response (ASSR) has widespread usage in the clinical hearing assessment of infants and young children. The present study evaluated the effect of restricting maximum possible intensity to 100 dB HL on ASSR thresholds. This retrospective study was conducted in multiple audiology centers. ASSR thre sholds with restricted settings were evaluated in 58 infants (116 ears). They had absent otoacoustic emissions and click-evoked auditory brainstem response waveforms and bilateral severe to profound hearing loss in behavioral evaluations. ASSR thresholds were absent in 28 %, 25%, 60 %, and 70 % of ears in 500, 1000, 2000, and 4000 Hz, respectively. The mean value of remained thresholds was approximately 90−95 dB HL. Restricted ASSR settings are prevalent; however, they fail to provide extensive additional information about hearing sensitivity. Thus, manufacturers are suggested to improve ASSR setting and transducers and resolve the intensity restrictions. ASSR settings should be able to test auditory thresholds to level of 120 dB HL.

The Auditory steady state response (ASSR) provides a frequency-specific and automatic assessment of hearing sensitivity and is used in infants and difficult-to-test adults.. The aim of this study was to compare the ASSR thresholds among various types (normal, conductive, and sensorineural), degree (normal, mild, and moderate), and configuration (flat and sloping) of hearing sensitivity, and measuring the cutoff point between normal condition and hearing loss for different frequencies..Patients and This clinical trial was performed in Iran and included patients who were referred from Ear, Nose, and Throat Department. A total of 54 adults (27 with sensorineural hearing loss, 17 with conductive hearing losses, and 10 with normal hearing) were randomly chosen to participate in our study. The type and degree of hearing loss were determined through testing by otoscopy, tympanometry, acoustic reflex, and pure tone audiometry. Then the ASSR was tested at carrier frequencies of 500, 1000, 2000, and 4000 Hz.. The ASSR accurately estimates the behavioral thresholds as well as flat and sloping configurations. There was no correlation between types of hearing loss and difference of behavioral and ASSR thresholds (P = 0.69). The difference between ASSR and behavioral thresholds decreased as severity of hearing loss increased. The 40, 35, 30, and 35 dB could be considered as cutoffs between normal hearing and hearing loss for 500, 1000, 2000, and 4000 Hz, respectively.. The ASSR can accurately predict the degree and configuration of hearing loss and discriminate the normal hearing from mild or moderate hearing loss and mild from moderate hearing loss, except for 500 Hz. The Air-conducted ASSR could not define the type of hearing loss..

The prevalence of hearing loss in neonates is 2-5 out of every 1,000 live births. Global Health Committee, American Academy of Otolaryngology, and American Academy of Pediatrics have recommended that hearing loss in infants be identified, and treated when possible, prior to 6 months of age. This study was designed with the aim to screen the hearing of neonates in Mashhad, Iran. All neonates born in Imam Reza, Om-Albanin and Ghaem Hospitals from November 2008 to November 2010 were screened by Otoacoustic Emission (OAE) test at the time of discharge, followed by a secondary OAE test in case of the failure of the first test; also, a confirmatory Auditory Steady State Response (ASSR) test was performed in 3 weeks to evaluate the type of hearing loss. After data analysis, the frequency of hearing loss in neonates and different risk factors were assessed. In the present study, 8,987 neonates were analyzed. Thirty one neonates (3.5 per 1000) failed the ASSR test; among these neonates, 6.5%, 25.8%, 25.8% and 19.2% had slight, mild, moderate, and moderate to severe hearing loss, respectively. Also, 16.1% had profound deafness and 6.5% presented with sensorineural involvement. Positive family history of hearing impairments, craniofacial anomalies, hyperbilirubinemia and different hearing syndromes were significantly different between the case and control groups (P<0.05). In this study, 3.5 neonates out of 1,000 live births had different types of hearing impairments; therefore, it is recommended that screening be performed before discharge.