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Year : 2021  |  Volume : 5  |  Issue : 1  |  Page : 8-11

Effects of probe tip placement on static acoustic admittance at the plane of measurement

1 Audiology Unit, EYE and ENT Hospital, Raipur, Chhattisgarh, India
2 Department of ENT, Audiology and Speech Language Pathology Unit, Dr. BRAM Hospital, Pt.J.N.M. Medical College, Raipur, Chhattisgarh, India

Correspondence Address:
Mr. Debadatta Mahallik
Department of ENT, Audiology and Speech Language Pathology Unit, Room No-237, Pt. JNM Medical College, Raipur - 492 001, Chhattisgarh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/aiao.aiao_15_20

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Introduction: Tympanograms are recorded at the plane of the probe tip in the ear canal, consequently, this recording is called a tympanogarm in the plane of measurement and it includes both the acoustic admittance of the trapped volume of air between the probe tip and the tympanic membrane and the admittance of the middle ear system at the tympanic membrane. Materials and Methods: Eighty three participations (166 ears- 85 right ears, 81 left ears) were selected for the study. participants who had negative middle ear pressure greater than -50dapa and + 50 dapa and air and bone conduction thresholds gap of equal or more than 15 dB were excluded from the study. Data Analysis: Pearson correlation coefficient was carried out to see the relationship between residual ear canal volume (RECV) and acoustic admittance (Ya) and as well as for the tympanometric peak pressure (TPP). Results: Results shows there is strong positive correlation (r =0.854, P <0.001) between the residual volume in the ear canal and admittance. Acoustic admittance were well correlated with the residual ear canal volume with coefficient of determination of r^2 = 0.793. In case of the middle ear pressure, it has been shown that there is positive moderate correlation (r = 0.679, P < 0.001) between the middle ear pressure and acoustic admittance with coefficient of determination of r^2 = 0.473. Conclusion: The shift of probe tip placement in the ear canal and middle ear pressure variation changes the acoustic admittance value during immitance audiometry.

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