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Single vs. double acoustic reflectometry tracings
The Pediatric Infectious Disease Journal
|September 1, 1989
Summary
Double reflectivity in acoustic otoscope tests is common in infants and may explain false negatives. Recording devices are crucial for accurate analysis of acoustic reflectivity and impedance tympanometry data.
Area of Science:
- Pediatric audiology
- Otoscopy technology
Background:
- Acoustic reflectometry and impedance tympanometry are key audiological assessments.
- Understanding test phenomena is vital for accurate diagnosis in children.
Purpose of the Study:
- To investigate the occurrence and implications of double reflectivity in acoustic otoscope tracings.
- To assess the relationship between double reflectivity and impedance tympanometry results.
- To provide recommendations for improving acoustic reflectometry data analysis.
Main Methods:
- Collected impedance tympanometry and acoustic reflectivity data from 503 children (3 months–12 years).
- Utilized an acoustic otoscope with a recorder to capture 1005 tracings.
- Analyzed tracings for single and double reflectivity patterns and correlated with impedance results.
Main Results:
- Double reflectivity was observed in 185 of 1005 tracings, more frequently in infants.
- This phenomenon was not seen with reflectivities above 7 units.
- 138 of 185 double reflectivity tracings were linked to abnormal impedance tympanometry.
Conclusions:
- The double reflectivity phenomenon may contribute to false negative results in acoustic reflectometry, especially with low/intermediate scores.
- Clinical research should use recording devices and analyze single and double reflectivity separately.
- Employing recorders can prevent false positive interpretations of intermediate reflectivities.