الفهرس 
ACKNOWLEDGMENT
Effect of ESWL on HearingOnly 14 pages are availabe for public view
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Abstract
Although, ESWL is an effective application in management of urinary lithiasis, it may cause a hazardous effect on hearing and vestibular functions.
This study was designed to evaluate the effect of ESWL on audiological and vestibular functions.
This study was conducted on 30 patients with urinary lithiasis before exposure to ESWL. The equipment used included Impedance audiometer (Interacoustics AZ 26, Denmark), dual channel clinical audiometer (Madsen model Orbiter 922), double room sound treated booth (IAC 1602A-t; Industrial Acoustic Company, USA),Intelligent Hearing System (Oto-acoustic Emissions (OAEs), sound level meter (Bruel and Kjaer 2235), and Otometrics VNG (GN Otometrics Demo Facility).
All subjects were subjected to the following:
1. Complete history taking.
2. ENT examination.
3. Pure tone audiometry (both air conduction and bone conduction).
4. Speech audiometry.
5. Impedance audiometry including tympanometry and acoustic reflex measurements.
6. Transient evoked otoacoustic emissions (TEOAEs) were elicited using click stimuli at stimulus intensity 85 dBSPL.
7. Videonystagmograghy.
These audiological and vestibular tests were done pre-ESWL, post-ESWL and after 2 months.
The results of the present study can be summarized in the following:
1. the greatest level of noise exposure was found to be at the head of the patient, with an average reading of 90 decibels (dB). The readings at the lithotripter technician’s station averaged 85 dB. The anesthetist and urologist were exposed to average sound levels of 81 and 79 dB, respectively.
2. The study showed a temporary threshold shift of pure tone after ESWL exposure at frequencies 2000 and 4000 Hz.
3. Effect on TEOAEs at frequencies 2000, 3000 and 4000 Hz.
4. Effect on vestibular function tests in the form of peripheral vestibular affection detected by caloric test, post head shaking test, positioning test and positional test.
Exposure to noise emitted by lithotripter was associated with significant changes in hearing. This effect was detected by PTA and TEOAEs and manifested in some subjects as temporary hearing loss. This effect seems to be related to the frequency of exposure to ESWL.
Exposure to noise emitted by lithotripter was associated with significant changes in vestibular system. This effect was detected by caloric test, post head shaking test, positioning test and positional test. It was temporary effect on vestibular system that was self limited and remission occurred after two months.