Zusammenfassung
Hintergrund
Die objektive Hörschwellenbestimmung beim Kind gehört zu den wichtigsten Aufgaben der Audiologie. Wegen gravierender Unzulänglichkeiten der bisher hierfür eingesetzten Methoden (BERA, CERA) muss nach methodischen Verbesserungen gesucht werden. Einen erfolgversprechenden Ansatz stellen möglicherweise die „amplitude modulation following responses“ (AMFR) dar. Diese objektiven Reizantworten weisen im Gegensatz zu den konventionellen transienten akustisch evozierten Potentialen eine hohe Frequenzspezifität auf und lassen Aussagen über das Hörvermögen im Tieftonbereich zu.
Probanden und Methoden
Ziel unserer Studie war die Objektivierung der Hörschwelle bei normalhörenden Probanden unterschiedlichen Alters. Als subjektiver Kontrolltest erfolgte eine Tonaudiometrie, als objektive Tests die Messung von AMFR (mit 2 verschiedenen Geräten und unterschiedlichen Parametern) sowie die CERA („cortical electric response audiometry“). Die Tests wurden bzgl. der Genauigkeit der Hörschwellenbestimmung verglichen und auf Praktikabilität untersucht.
Ergebnisse
Bei den AMFR zeigten sich z. T. große Abweichungen zwischen subjektiver Hörschwelle und objektiv bestimmter Reizantwortschwelle, wobei die kleinsten Abweichungen bei niedrigen Frequenzen auftraten. Bezüglich der Genauigkeit der Hörschwellenbestimmung war die CERA den AMFR überlegen.
Fazit
Trotz der teilweise großen Abweichungen der durch die AMFR ermittelten objektiven Schwellen halten wir die Methode dafür geeignet, Lücken in der objektiven Hörschwellenbestimmung, zumindest im Bereich niedriger Frequenzen, zu schließen.
Abstract
Background
Determining the hearing threshold in children is one of the most important topics in audiology. Because the existing methods—brainstem evoked response audiometry (BERA) and cortical evoked response audiometry (CERA)—show some severe insufficiencies, it is necessary to look for improved methods. A promising approach may be amplitude modulation following responses (AMFR). In contrast to the conventional transient auditory evoked potentials, these responses show a high-frequency specificity, and they possibly allow statements about the hearing threshold in the low-frequency range.
Subjects and methods
The purpose of our study was to objectively detect the hearing threshold in normal-hearing persons of various ages. Pure-tone audiometry served as a subjective control test. For objective tests, we used the measurement of AMFR (two different systems with distinct parameters) and CERA. We compared the different methods with regard to accuracy of the determination of the hearing threshold and investigated the practicability.
Results
The results showed some large deviations between the subjective hearing threshold and the objectively determined responses. The lowest deviations appeared at low frequencies. With respect to the variability of results, CERA was clearly superior to AMFR.
Conclusion
Despite large deviations in the responses objectively determined by AMFR, we think AMFR is suitable to close some gaps in determining objective hearing thresholds, at least at low frequencies.
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Liebler, S., Hoth, S. & Plinkert, P. Stationäre evozierte Potenziale des auditorischen Systems. HNO 56, 1025–1039 (2008). https://doi.org/10.1007/s00106-008-1694-1
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DOI: https://doi.org/10.1007/s00106-008-1694-1
Schlüsselwörter
- Auditorische stationäre evozierte Potenziale (ASSR)
- Objektive Hörschwellenbestimmung
- Frequenzspezifität
- AMFR
- CERA