[The acoustic distortion products application in noise pathology]

We study a total of 40 individuals exposed to noise in 3 forms of presentation: continuous (metal-workers), impact (hunters and policemen) and acute (bombs or fireworks). All them underwent a study with otoscopy, pure-tone audiometry, speech audiometry, tympanometry and recording of DP 2f1-f2 in the DPgram form. The results showed an early damage in DP (3 to 6 kHz). That are demonstrated by a decrease in recording in direct relation with increased audiometric threshold. Being obvious at 6 kHz among subjects exposed to continuous noise, though the smaller extent data are expressed in the records of 3 and 4 kHz, independently of noise form of exposure.