Biomedical subjects

O A Sobhy

Publications and source records attributed to O A Sobhy.

3 recordsLinked to original sources

PubMed2004

Evaluation of aural manifestations in temporo-mandibular joint dysfunction.

Thirty patients with temporo-mandibular joint dysfunction were selected to investigate the changes in otoacoustic emissions before and after conservative treatment of their temporo-mandibular joints. Pure tone audiometry, transient-evoked otoacoustic emissions (TEOAE), distortion-product otoacoustic emissions (DPOAE) as well as a tinnitus questionnaire were administered to all patients before and after therapy. Therapy was conservative in the form of counselling, physiotherapy, anti-inflammatory agents, muscle relaxants, and occlusal splints. Results indicated insignificant changes in the TEOAEs, whereas there were significant increases in distortion product levels at most of the frequency bands. These results were paralleled to subjective improvement of tinnitus.

Adolescent↗

PubMed1993

Interaural attenuation using insert earphones: electrocochleographic approach.

We measured the interaural attenuation for click stimuli using insert earphones. Electrocochleographic thresholds were determined when clicks were presented both ipsilaterally and contralaterally to the recording ear. The interaural attenuation was calculated as the difference between ipsilateral and contralateral thresholds. Results from normal listeners showed that crossover occurred. Results agree with previous investigators who used a different approach. Results confirm that one may need to mask the nontest ear in clinical evoked potential testing even though insert earphones are used. Several approaches to the question of when to mask are proposed.

Acoustic Stimulation↗

PubMed1992

Using the derived auditory brain stem response to estimate traveling wave velocity.

An estimate of the traveling wave velocity (TWV) was evaluated in 18 young adults to determine the technique's applicability as a possible tool in evaluating Meniere's disease. This TWV estimation uses a derived auditory brain stem response procedure requiring high-intensity masking. The results indicate that on average, TWVs were similar to those obtained via psychophysical measures or electrocochleography. However, instances of undermasking, due to subjects' intolerance, resulted in a number of subjects exhibiting faster than expected TWVs.

Acoustic Stimulation↗