Related Experiment Video
Updated: Feb 2, 2026
Synthesis and Microdiffraction at Extreme Pressures and Temperatures
Published on: October 7, 2013
Eustachian Tube Dysfunction and Wideband Absorbance Measurements at Tympanometric Peak Pressure and 0 daPa
Sreedevi Aithal1,2, Venkatesh Aithal1,2, Joseph Kei2
1Department of Audiology, The Townsville Hospital, Townsville, Australia.
Background:
Although wideband absorbance (WBA) provides important information about middle ear function, there is limited research on the use of WBA to evaluate eustachian tube dysfunction (ETD). To date, WBA obtained under pressurized condition has not been used to evaluate ETD.
Purpose:
The objective of the study was to compare WBA at 0 daPa and tympanometric peak pressure (TPP) conditions in healthy ears and ears with ETD.
Research Design:
A cross-sectional study design was used.
Study Sample:
A total of 102 healthy ears from 79 participants (mean age = 10.0 yr) and 43 ears from 32 patients with ETD (mean age = 16.0 yr) were included in this cross-sectional study. WBA was measured at 0 daPa (WBA₀) and TPP WBA at TPP (WBATPP).
Data Collection And Analysis:
WBA results were analyzed using descriptive statistics and t-tests with the Bonferroni correction. An analysis of variance with repeated measures was applied to the data.
Results:
WBA₀ was significantly lower in the ETD group than in the control group. The WBA₀ of the control group demonstrated a broad peak between 1.25 and 4 kHz, whereas the WBA₀ of the ETD group had a peak between 2.5 and 4 kHz. WBATPP of the ETD group approached values close to that of the control group. In the control group, WBATPP was only 0.06 to 0.09 higher than WBA₀, whereas in the ETD group, WBATPP was 0.29 to 0.42 higher than WBA₀ between 0.6 and 1.5 kHz. A differential pattern of WBA at TPP relative to 0 daPa was observed between ears with ETD and ears with otitis media with effusion (OME) and negative middle ear pressure (NMEP).
Conclusions:
Hence, a comparison of WBA₀ and WBATPP can provide potentially useful diagnostic information, and hence can be used as an adjunct tool to evaluate ETD. This is important especially in young children or some adults who are unable to perform maneuvers such as Toynbee or Valsalva during ETD assessment. Further research is needed to verify the results using test performance measures to determine whether WBA₀ and WBATPP can objectively determine the presence of ETD or OME with NMEP.
Related Concept Videos
02:57Definition and Measurement of Pressure: Atmospheric Pressure, Barometer, and Manometer
01:16Measurement of Fluid Pressure
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
01:17Measurement of Blood Pressure
01:30Equipments Used To Measure Blood Pressure
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
01:28Special considerations while measuring blood pressure
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
03:02Constant Pressure Calorimetry