In children undergoing tonsillectomy ± adenoidectomy without eustachian dysfunction, the objective is to control tubal functions with tympanometry utilising probes at 226 Hz and 1000 Hz, as well as measuring the ipsilateral and contralateral acoustic reflexes with a 226 Hz probe. An eustachian function test with a 226 Hz probe (automatic Williams test) and play audiometry are to be conducted on young children, while pure tone audiometry is to be conducted on older children, in the preoperative period, on the first day after surgery and in the second week after surgery. The primary objective is to ascertain whether the tubal functions, which are hypothesised to be impaired on the first day, return at the latest in the second week, with all tests evaluating the eustachian tube both directly and indirectly. The secondary objective is to determine whether this recovery occurs earlier with the 226 Hz probe or the 1000 Hz probe.

Inclusion Criteria:

• 4-15 years old child patient
• No preoperative tubal dysfunction detected in the patient
• Willingness to participate in the study by the patient and his/her parents
• The patient has no craniofacial anomaly, genetic disorder, cleft palate-lip anomaly
• No bleeding disorder or disease

Exclusion Criteria:

• <3 years old, >15 years old paediatric patient
• Tubal dysfunction detected preoperatively
• Not wanting to participate in the study at any stage of the study
• The patient has craniofacial anomaly, genetic disorder, cleft palate-lip anomaly
• Having a bleeding disorder or disease

Pediatric patients aged 4-15 years who underwent tonsillectomy ± adenoidectomy for chronic tonsillitis or sleep breathing disorder without eustachian tube dysfunction were included in the study.