CRF AND HEAR LOSS

hi dears
this question ask by prof to the sixth year student .
if a patient came with CRF so what will you ask him according to CNS examinition?
the answer
you must check hear loss .
and the cause?
The incidence of sensorineural hearing loss (SNHL) was investigated in 68 patients who reached chronic renal failure (CRF) in childhood with the aim of identifying possible risk factors. Tests were carried out by means of pure-tone and impedance audiometry. SNHL was found in 29% of patients on conservative treatment, 28% of patients on hemodialysis, and 47% after renal transplantation. Differences among groups were not significant. A significant correlation was found with the administration of ototoxic drugs (aminoglycosides and furosemide). We hypothesize that SNHL may be reduced in patients with CRF or on renal replacement therapy by strictly monitoring ototoxic therapy.
these answer i take it from the net.
so for more info if you want enter GOOGLE and write the relation ship between CRF and hear loss.
my regards