Ellis Arjmand | Baylor College of Medicine (original) (raw)
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Papers by Ellis Arjmand
International journal of pediatric otorhinolaryngology, 2005
The purpose of this research was to compare the signal-to-noise ratio required for equal performa... more The purpose of this research was to compare the signal-to-noise ratio required for equal performance for children (aged 6-14 years) with normal hearing (N=17) versus those with severe-to-profound unilateral hearing impairment (N=20) who can be at a disadvantage, particularly when sounds are presented to the impaired ear. The listening environment is designed to approximate that which is encountered in a typical classroom. All signals (Hearing in Noise Test-Children and Nonsense Syllable Test) were presented in the sound field from various azimuths with continuous noise presented from all quadrants. The children were required to repeat twenty items, from each test, in each listening condition. The intensity of the presentations was varied based on the accuracy of previous items. Average signal-to-noise ratios are compared between and within groups. (1) In most listening conditions, significantly greater signal-to-noise ratios were needed by those with unilateral hearing impairment th...
International Journal of Pediatric Otorhinolaryngology, 2011
International Journal of Pediatric Otorhinolaryngology, 2010
The study goal was to determine the prevalence and clinical significance of a large vestibular aq... more The study goal was to determine the prevalence and clinical significance of a large vestibular aqueduct (LVA) in children with sensorineural hearing loss (SNHL). We conducted a retrospective review of a pediatric SNHL database. One hundred seven children with SNHL were selected and their radiographic and audiometric studies were evaluated. Radiographic comparisons were made to a group of children without SNHL. A vestibular aqueduct (VA) larger than the 95th percentile of controls was present in 32% of children with SNHL. Progressive SNHL was more likely to occur in ears with an LVA and the rate of progressive hearing loss was greater than in ears without an LVA. The risk of progressive SNHL increased with increasing VA size as determined by logistic regression analysis. An LVA is defined as one that is >or=2 mm at the operculum and/or >or=1 mm at the midpoint in children with nonsyndromic SNHL. An LVA appears to be more common than previously reported in children with SNHL. A linear relationship is observed between VA width and progressive SNHL. The finding of an LVA in children with SNHL provides diagnostic as well as prognostic information.
International journal of pediatric otorhinolaryngology, 2005
The purpose of this research was to compare the signal-to-noise ratio required for equal performa... more The purpose of this research was to compare the signal-to-noise ratio required for equal performance for children (aged 6-14 years) with normal hearing (N=17) versus those with severe-to-profound unilateral hearing impairment (N=20) who can be at a disadvantage, particularly when sounds are presented to the impaired ear. The listening environment is designed to approximate that which is encountered in a typical classroom. All signals (Hearing in Noise Test-Children and Nonsense Syllable Test) were presented in the sound field from various azimuths with continuous noise presented from all quadrants. The children were required to repeat twenty items, from each test, in each listening condition. The intensity of the presentations was varied based on the accuracy of previous items. Average signal-to-noise ratios are compared between and within groups. (1) In most listening conditions, significantly greater signal-to-noise ratios were needed by those with unilateral hearing impairment th...
International Journal of Pediatric Otorhinolaryngology, 2011
International Journal of Pediatric Otorhinolaryngology, 2010
The study goal was to determine the prevalence and clinical significance of a large vestibular aq... more The study goal was to determine the prevalence and clinical significance of a large vestibular aqueduct (LVA) in children with sensorineural hearing loss (SNHL). We conducted a retrospective review of a pediatric SNHL database. One hundred seven children with SNHL were selected and their radiographic and audiometric studies were evaluated. Radiographic comparisons were made to a group of children without SNHL. A vestibular aqueduct (VA) larger than the 95th percentile of controls was present in 32% of children with SNHL. Progressive SNHL was more likely to occur in ears with an LVA and the rate of progressive hearing loss was greater than in ears without an LVA. The risk of progressive SNHL increased with increasing VA size as determined by logistic regression analysis. An LVA is defined as one that is >or=2 mm at the operculum and/or >or=1 mm at the midpoint in children with nonsyndromic SNHL. An LVA appears to be more common than previously reported in children with SNHL. A linear relationship is observed between VA width and progressive SNHL. The finding of an LVA in children with SNHL provides diagnostic as well as prognostic information.