Effects of Hemodialysis on Hearing Threshold

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Abstract
Chronic renal failure patients (71) undergoing long-term hemodialysis were evaluated for the effects of a dialysis event on hearing function. Osmotically active serum constituents were examined for relationship to fluctuating hearing threshold levels. Reliability of hearing levels was better in those patients tested without an intervening dialysis event. Those patients tested before and after hemodialysis demonstrated greater hearing fluctuation than those patients evaluated between dialysis events. This threshold fluctuation was unrelated to serum area N, creatinine, K+, Na+, Ca2+, or glucose. Hearing test reliability in dialyzing renal patients is reasonably good, but test results are likely to be more consistent if testing is accomplished a number of hours after a given dialysis event. No direct relationship between hearing level fluctuation and fluctuation in individual osmotically active serum constituents appeared to be present.
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