we compared the extent of temporary threshold shift (tts) and hair cell loss following high level 4 khz noise exposure with those preconditioned with moderate level 1 and 4 khz octave band noise. fifteen male albino guinea pigs (300- 350 g in weight) were randomly allocated into three groups: those exposed to 4 khz octave band noise at 102 db spl (group 1, n=5); those conditioned with 1 khz oct...

OBJECTIVE To assess the clinical utility of quantifying pure-tone hearing thresholds in terms of the forward-going sound pressure wave. DESIGN Sound pressure measurements in the ear canal were used to derive, with hearing threshold measurements, hearing thresholds expressed in terms of the forward-going sound pressure wave, hearing thresholds based on coupler-based calibration, and hearing th...

noise induced hearing loss (nihl) is one of the most important occupational disease worldwide. nihl has been found potentiate by simultaneous carbon monoxide (co) exposure. free radicals have been implicated in cochlear damage resulted from the exposure to noise and due to the co hypoxia. this study examined whether α-tocopherol administration, as a free radical scavenger, causes the attenuatio...

background: lead still remains an important problem for poor, inner-city, ethnic minority children, with a particular emphasis on lead paint and dust. in egypt, there is no national survey about the prevalence of elevated blood lead level among children. objective: to assess the environmental lead level as well as to determine blood lead level among primary school children and find out its rela...

When the e a r i s stimulated by high-intensity lowfrequency sounds by means of ordinary earphones a sound p res su re is reached were tacti le receptors a r e stimulated. Different attempts have been made to establish the audiometric threshold of this tactile sensation. During pure-tone audiometry i t was observed that some severely hard of hearing and profoundly deaf subjects could give three...

Mammals exposed to loud aerial sounds exhibit temporary threshold shifts (TTS) that are linearly related to increases of sound pressure above baseline hearing levels. It was unknown if this relationship held true for aquatic ectotherms such as fishes. To test this linear threshold shift hypothesis (LINTS) in fishes, we examined the effects of increased ambient sound on hearing of two species di...

Objective(s): Noise-induced hearing loss (NIHL) is the major cause of acquired hearing loss.  Celecoxib, a cyclooxygenase-2 (COX-2) inhibitor, is a non- steroidal anti- inflammatory drug (NSAID) with known antioxidant and antineoplastic activity. Therefore, we monitored the extent of temporary noise- induced threshold shifts (TTS) and cochlear damage caused by high level 4- kHz noise exposure t...