[Audiometric threshold shift in patients with cochlear implantation].

A great number of studies have been carried out during many years in order to evaluate the histological changes that take place after the insertion of a cochlear implant, having been experimentally and histologically, in temporal bones, demonstrated its relative harmlessness. We have focused our functional investigation induced by the implants through the shift of pre- and postoperative tonal audiometric thresholds, in 13 carriers on an C. I.