High frequency tympanometry findings in neonates: does it depend on head position?

Area of Science:

• Pediatric Audiology
• Neonatal Otoacoustic Emissions
• Auditory Evoked Potentials

Background:

• High-frequency tympanometry (HFT) is a valuable tool for assessing middle ear function in neonates.
• Understanding factors influencing HFT results, such as head position, is crucial for accurate interpretation.
• Neonatal hearing screening relies on objective measures like HFT.

Purpose of the Study:

• To determine the influence of different head positions on high-frequency tympanometry (HFT) outcomes in neonates.
• To assess the reliability of HFT measurements across varying head orientations in the neonatal population.

Main Methods:

• A cross-sectional study involving 157 neonates (mean age 48.3 hours).
• HFT measurements were recorded with neonates in two head positions: face sideways and face up.
• Key HFT parameters including admittance, tympanometric peak pressure, and static admittance were analyzed.

Main Results:

• A significant difference was observed in mean uncompensated admittance between the two head positions (face sideways vs. face up).
• However, tympanometric peak pressure and static admittance measures showed no significant effect of head position.
• These results indicate resilience of specific HFT measures to head position variations in neonates.

Conclusions:

• The study supports the use of established high-frequency tympanometry normative values for neonates.
• HFT results for tympanometric peak pressure and static admittance are reliable regardless of the head positions tested.
• This finding simplifies HFT procedures in neonatal audiological assessments.