Audiometric testing

Impairment of eighth cranial nerve function is the most important adverse effect of streptomycin. Vestibular function is most frequently affected, but hearing may also be impaired. Audiometric testing should be performed in patients who must receive streptomycin for more than 2 months. Streptomycin occasionally causes nephrotoxicity. 

The neurotoxicity of streptomycin can result in respiratory paralysis from neuromuscular blockage, especially when the drug is given soon after the use of anesthesia or muscle relaxants. Reserve the administration of streptomycin in parenteral form for patients where adequate laboratory and audiometric testing facilities are available during therapy. 

Monitoring Baseline and periodic caloric stimulation tests and audiometric tests are adyisable with extended streptomycin therapy. Tinnitus, roaring noises, or a sense of fullness in the ears indicates need for audiometric examination, termination of streptomycin therapy, or both. 

Audiometric testing before, during, after treatment... 

Renal function, audiometric testing during extended therapy or with application to extensive burns or large surface area... 

The effect of THC, 7.5 mg and 15 mg, on auditory functioning has been investigated in eight men in a doubleblind, randomized, placebo-controlled, crossover trial (97). Blood concentrations of THC were measured for up to 48 hours after ingestion, and audiometric tests were carried out at 2 hours. There were no significant differences across treatments, suggesting that cannabis does not affect the basic unit of auditory perception. 

Retrobulbar neuritis is the major adverse effect noted in patients treated with ethambutol, Patients usually complain of a change in visual acuity and/or inability to see the color green. Vision testing should be performed on all patients who must receive ethambutol for more than 2 months. Impairment of eighth cranial nerve function is the most important adverse effect of streptomycin, Vestibular function is most frequently affected, but hearing may also be impaired. Audiometric testing should be performed in patients who must receive streptomycin for more than 2 months. Streptomycin occasionally causes nephrotoxicity. 

Topical 0.2% ciprofloxacin solution was effective and well tolerated in 232 patients with chronic suppurative otitis media the most frequently reported adverse events were pruritus, stinging, and earache. Audiometric tests did not show changes attributable to ciprofloxacin (20). 

In serial audiometric testing in 66 patients receiving cisplatin 100 mg/m per course, of 39 evaluable patients, 54% had no or mild hearing loss, 36% developed early hearing loss and 10% had late loss. If early hearing loss occurred and treatment was nevertheless continued, the speech frequencies were eventually affected in 71% of patients (124). 

Because hearing sensitivity falls off drastically at lower frequencies, clinical audiometric testing uses somewhat different scales. With the DIN/ANSI reference threshold of 6.5 dB SPL at 1 kHz, the threshold rises to 24.5 dB at 250 Hz and 45.5 dB at 125 Hz [Sataloff et al., 1980]. Hearing loss is then specified in decibels relative to the reference threshold, rather than the SPL directly, so that a normal audiogram would have a flat threshold curve at approximately 0 dB. 

Education and training—this provision requires that employees understand (1) how the ear works, (2) how to interpret the results of audiometric tests,... 

Explain how audiometric testing reveals information about an employee s ability to hear. 

Audiogram— The results of an audiometric test to determine the noise threshold at which a subject responds to different test frequencies. 

Audiometric Testing— Measures the hearing threshold of employees. 

INSTRUCTIONS To convert audiometric test results from ISO to ANSI, -14 dB from ISO for500 Hz,-tOcBfor 1,000 Hz, -8.5 dB for2,000 Hz. To average, add the readings for 3 frequencies... 

Hearing conservation—Preventing or minimizing noise-indnced deafness through the use of hearing protection devices, engineering methods, annual audiometric tests, and employee training. 

The purpose of audiometric testing, and explanation of test procedures. 

Audiometric testing Periodic audiometric testing is required for employees overexposed to noise. 

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