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

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