Middle Ear Pressure Assessment to Detect the Stapedius Reflex: A Prospective Observational Feasibility Study.

Area of Science:

• Otolaryngology
• Audiology
• Medical Engineering

Background:

• The stapedius reflex (SR) is crucial for understanding auditory function and protecting the inner ear.
• Traditional methods for SR detection can be limited in certain clinical scenarios, such as intraoperative assessments.

Purpose of the Study:

• To assess the feasibility of detecting the stapedius reflex (SR) using direct middle ear pressure monitoring.
• To evaluate this method's accuracy compared to traditional tympanometry during acoustic stimulation.

Main Methods:

• A prospective, observational feasibility study was conducted in an intraoperative setting.
• Eleven adult patients undergoing tympanotomy had a pressure transducer inserted into the middle ear for SR detection.
• Contralateral acoustic stimulation was applied, with ECG synchronization and signal filtering to enhance detection.

Main Results:

• The pressure-based method correctly identified 83.3% (20/24) of confirmed stapedius reflexes.
• No false positives were recorded; the system accurately detected no pressure changes when no reflex was elicited.
• The method demonstrated feasibility in the intraoperative environment.

Conclusions:

• Direct middle ear pressure monitoring is a feasible technique for detecting the stapedius reflex.
• This approach shows promise for objective reflex assessment, particularly for cochlear implant users, pending further validation.