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Rethinking the use of auditory brainstem response in acoustic neuroma screening
J J Zappia1, C A O'Connor, R J Wiet
1The Chicago Otology Group, Hinsdale, Illinois 60521, U.S.A.
The Laryngoscope
|October 23, 1997
Summary
Auditory brainstem response (ABR) shows 95% sensitivity for acoustic tumors, but accuracy decreases for smaller tumors. MRI is crucial for detecting small acoustic neuromas.
Area of Science:
- Neuroscience
- Radiology
- Audiology
Background:
- Magnetic resonance imaging (MRI) advancements challenge the role of auditory brainstem response (ABR) in acoustic tumor screening.
- Acoustic tumors, also known as acoustic neuromas, require accurate diagnostic methods for early detection and treatment.
Purpose of the Study:
- To evaluate the diagnostic accuracy and sensitivity of auditory brainstem response (ABR) in screening for acoustic tumors.
- To assess the impact of tumor size on ABR test performance.
Main Methods:
- Retrospective analysis of 388 surgically treated patients with acoustic tumors.
- Inclusion of 111 patients with complete preoperative MRI and ABR data for detailed assessment.
Main Results:
- Overall sensitivity of ABR for detecting acoustic tumors was 95% based on wave V interaural latency difference.
- ABR sensitivity was 100% for tumors >2 cm, 98% for tumors 1.1-2 cm, and 89% for tumors ≤1 cm.
- A significant decrease in ABR sensitivity was observed for smaller acoustic tumors.
Conclusions:
- Auditory brainstem response (ABR) remains a valuable tool for acoustic tumor screening, particularly for larger tumors.
- The findings highlight the importance of considering tumor size when interpreting ABR results and suggest a complementary role for MRI in detecting smaller acoustic neuromas.