It was studied the relation between haemodialysis and hearing disorders.
In order to obtain the relation between renal failue and hearing losses, 19 patients with renal failure who had never had any illness which might cause hearing losses, were examined by pure tone audiometer.
Ten out of 19 cases were perceptive deafness of 20dB-50dB in the high frequencies. Thus this hearing loss seemed due to renal failure.
Immediately before and after haemodialysis, BUN, serum concentration of sodium, potassium were ex amined and at the same time pure-tone audiometry was done.
The degrees of hearing loss were constant and in a few cases tinnitus appeared and disappeared soon after.
Pure-tone audiometry of 41 patients with renal failure treated with haemodialysis was done every 3 months for 3 years. Only 3 out of 41 cases revealed hearing loss of both ears more than 30dB in 8, 000Hz.
None of others showed any change of hearing during these 3 years.
Thus it was thought that good control of heamodialysis was hard to cause hearing loss.
Tinnitus and nose-bleeding were often found in the patients treated with haemodialysis.
It was not clear the relation between tinnitus and nose-bleeding. But it was studied that tinnitus had good relation with osmotic pressure and anemia.
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