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Original Article

Effect over time of allopurinol on noise-induced hearing loss in guinea pigs: Efecto en el tiempo del alopurinol sobre la hipoacusia inducida por ruido en cobayos

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Pages 227-234 | Received 13 Feb 2002, Accepted 21 May 2002, Published online: 07 Jul 2009
 

Abstract

Temporary threshold shift (TTS) and permanent threshold shift (PTS) may follow prolonged noise exposure. Several reports suggest that noise-induced damage to the cochlea may be related to the activity of reactive oxygen species (ROS). Drugs that scavenge or block ROS formation also protect the cochlea. Guinea pigs, treated with allopurinol, were exposed to white noise (120 dB SPL) or impulse noise (114 dB SPL) for 2 and 5 h. The protective effect of allopurinol was confirmed, but, at these levels of sound, it was present only after noise exposure up to 2 h. This study also offers evidence suggesting that allopurinol does not influence the establishment of PTS.

La exposición prolongada al ruido puede provocar cambios temporales (TTS) y permanentes de umbral (PTS). Varios reportes sugieren que los daños inducidos por el ruido en la cóclea pueden estar relacionados con la actividad de especies reactivas al oxígeno (ROS). Hay medicamentos que destruyen o bloquean la formaciones de ROS y que también protegen la cóclea. Un grupo de cobayos tratados con alopurinol fue expuesto a un ruido bianco (120 dB SPL) o a ruidos de impulso (114 dB SPL) durante 2 y 5 horas. El efecto protector del alopurinol fue confirmado, pero, a estos niveles de sonoros, solamente se hizo presente después de exposición a ruido por más de 2 horas. Este estudio ofrece evidencias que sugieren que el alopurinol no influye en el establecimiento del PTS.

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