Introduction: The obstructive sleep apnea syndrome (OSAS) is a respiratory disorder that occurs during sleep and it is relatively common in children. Aim: The goal of this paper is to verify if there is a relationship between the obstructive sleep apnea syndrome (OSAS) and auditory processing. Methods: In order to do that, three groups of children ranging in age from 5 to 11 were studied, including a normal group. Twenty subjects who made up the study group were submitted to ear, nose and throat (ENT) exams and to polysomnography (PSG), and were divided in two groups: GROUP I (RO) comprised of 10 children who presented oral breathing and displayed normal PSG, and GROUP II (SAS) comprised of 10 children who presented oral breathing and displayed abnormal PSG. Their performance was compared to the performance of the third group - GROUP III (REN) comprised of 10 children who did not refer ENT difficulties. All the subjects completed a basic audiometric assessment as well as an auditory processing diagnosis. Results: The analyses of the results revealed a statistically significant difference in ENT exams related to the turbinate and the palatine tonsils. Group II presented a higher incidence of turbinate hypertrophy levels II and III (p < 0.001) and palatine tonsils hypertrophy grades III and IV (p 0.007). Regarding the auditory processing assessment, a statistically significant difference (p < 0.001) was obtained in the dichotic digits test. Group II performed worse than group III. Also, for the non-verbal sequence memory test, Group II obtained a worse result (p < 0.022) than Group I. Conclusion: Subjects with OSAS obtained worse results in auditory processing tests.723321327Rosen, C.L., Obstructive sleep apnea syndrome (OSAS) in children: Diagnostic challenges (1996) Sleep, 19 (10), pp. 274-277Marcus, C.L., Sleep-disordered breathing in children (2000) Pediatr, 12, pp. 208-212Marcus, C.L., Sleep-disordered breathing in children (2001) Am J Respir Crit Care Med, 164, p. 16Goldstein, N.A., Fatima, M., Campbell, T.F., Rosenfeld, R.M., Child behavior and quality of life before and after tonsillectomy and adenoidectomy (2002) Arch Otolaryngol Head Neck Surg, 128, pp. 770-775Morton, S., Rosen, C., Larkin, E., Tishler, P., Aylo, J., Redlin, S., Predictors of sleep-disordered breathing in children with a history of tonsillectomy and adenoidectomy (2001) Sleep, 24 (7), pp. 823-829Clinical practice guideline: Diagnosis and management of childhood obstructive sleep apnea syndrome (2002) Pediatrics, 109 (4), pp. 704-712. , American Academy of PediatricsChervin, R.D., Archbold, K.H., Dillon, J.E., Panahi, P., Pituch, K.J., Dahl, R.E., Guilleminault, C., Innatention, hyperactivity, and symptoms of sleep-disordered breathing (2002) Pediatrics, 109 (3), pp. 449-456O'Brien, L.M., Gozal, D., Neurocognitive dysfunction and sleep in children: From human to rodent (2004) The Pediatr Clin N Am, 51, pp. 187-202Pereira, L.D., Processamento auditivo central - Abordagem passo a passo (1997) Processamento Auditivo Central - Manual de Avaliação, pp. 49-60. , Pereira LD, Schochat E. São Paulo: LoviseSilman, S., Silverman, C.A., (1991) Auditory Diagnosis, , San Diego: Academic Press IncCarvallo, R.M.M., Imitanciometria (2004) Tratado de Fonoaudiologia, pp. 569-584. , Ferreira LP, Befi-Lopes DM, Limongi, SCO, organizadoras. São Paulo: RocaChami, F.A.I., (1997) Avaliação Nasofibroscópica e Radiológica de Pacientes Com Hiperplasia de Amígdala Faríngea, , [tese de mestrado]. São Paulo: Universidade Federal de São Paulo - Escola Paulista de MedicinaBrodsky, L., Modern assessment of tonsils and adenoids (1989) Ped Clin North America, 36 (6), pp. 1551-1571Standards and indications for cardiopulmonary sleep studies in children (1996) Am J Respirat Crit Care Med, 153, pp. 866-878. , American Thoracic SocietyCorona, A.P., (2000) Processamento Auditivo Central: Seqüencialização Verbal de Três e Quatro Sílabas Em Escolares de Três a Doze Anos [Monografia de Especialização], , Salvador: Universidade Federal da BahiaSantos, M.F.C., Pereira, L.D., Escuta com dígitos (1997) Processamento Auditivo Central - Manual de Avaliação, pp. 147-150. , Pereira LD, Schochat E. São Paulo: LoviseCarrol, J.L., Longhlin, G.M., Obstrutive sleep apnea syndrome in infants and children: Clinical features and pathophysiology (1995) Principles and Practice of Sleep Medicine in the Child, , Feber R, Kryger M. Philadelphia: WB SaundersCentral auditory processing - Current strategies and implications of clinical practice (1996) Am J Audiology, 5 (2), pp. 41-54. , American Speech Language Hearing AssociationBellis, T.J., (2003) Assessment and Management of Central Auditory Processing Disorders in the Educational Setting: From Science to Practice, , San Diego: Delmar LearningMusiek, F.E., Assessment of central auditory dysfunction: The dichotic digits tests revisited (1983) Ear Hear, 4, pp. 79-83Musiek, F.E., Kibbe, K., Baran, J.A., Neuroaudiological results from splitbrain patients (1984) Seminars in Hearing, 5, pp. 219-229Guilleminault, C., Li, K., Quo, S., Inouye, R.N., A prospective study on the surgical outcomes of children with sleep disordered breathing (2004) Sleep, 27 (1), pp. 95-100Gozal, D., Sleep-disordered breathing and school performance in children (1998) Pediatrics, (102), pp. 616-620Lipton, A.J., Gozal, D., Treatment of obstructive sleep apnea in children: Do we really know how? (2003) Sleep Med Rev, 7, pp. 61-80Brown, A.W., Brierley, J.B., The earliest alterations in rat neurons and astrocytes after anoxia-ischaemia (1973) Acta Neuropathol, 23, pp. 9-22Shiomi, T., Guilleminault, C., Stoohs, R., Schnittger, I., Obstructed breathing in children during sleep monitored by echocardiography (1993) Acta Paediatr, (82), pp. 863-871