Abstract
Background: Tympanometry is one of the most important audiological tests for the assessment of neonatal hearing screening programs. This test is usually done using a 226 Hertz probe tone; however, in infants less than 6 months of age, using this probe tone frequency is not reliable due to the different characteristics of the middle ear compared to adults. The purpose of this study was to assess the obtained tympanometric data in neonates 1 to 14 days with normal hearing using 226, 678, 800 and 1000 Hertz frequency probes tones.
Materials and Methods: In this cross-sectional study, 30 neonates aged 1 to 14 days who were diagnosed as normal in hearing aspect with using otoacoustic emissions test, were assessed by tympanometry. Tympanometric tests were performed using 226, 678, 800 and 1000 Hertz frequency probe tones for both ears. For data analysis, the T-paired method has been used.
Results: With using 226 Hertz frequency probe tone, incidence of unusual double peak tympanograms was observed in 65% of cases, which with increasing frequency of the probe tone, this percentage was decreased. There was also a statistically significant difference between the static admittance peak compensated in two 226 and 1000 Hertz frequency probes tones.
Conclusion: In neonates with normal hearing and without any risk factors for hearing loss, the 1000-Hertz Tympanogram shows a better middle ear status than the 226-Hertz tympanogram.
 

Introduction: Vestibular defects, vertigo and Dizziness may lead to delay in postural control, lack of coordination, vertigo attacks and ultimately imbalance in children. In this systematic review, the factors affecting children's balance disorders and the effective tests for evaluating these children were investigated.
Methods: Valid articles were searched in Pubmed, Google Scholar, Elsevier databases between 2000 and 2023 using the keywords Balance, Vertigo, Dizziness, Vestibular, Children. In the present study, research articles, narrative reviews, systematic reviews, and meta-analysis related to the purpose of the study were evaluated and included in the study.
Results: In the present study, a total of 95 articles were found. By repetition, 13 articles were removed and 82 articles remained in the study. By examining the titles of these articles, 7 articles were removed because the title was not relevant to the purpose of this study and 9 articles were removed because the full text of the article was not relevant,then leaving 66 relevant articles. 8 studies were excluded from the present study due to exclusion criteria. Therefore, a total of 58 articles were included in this systematic review and effective factors in the occurrence of balance disorders and effective assessment in identifying these disorders were found.
Conclusions: Correct diagnosis of balance disorders in children using appropriate tests not only prevents unnecessary examinations and reduces parents' worries, but is also a prerequisite for successful treatment.