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Clinical Note

Are real-ear measurements (REM) accurate when using the modified pressure with stored equalization (MPSE) method?

Pages 463-466 | Received 14 Jul 2009, Accepted 07 Nov 2009, Published online: 02 Mar 2010
 

Abstract

Abstract

Audiologists typically verify hearing instrument fitting using real-ear measurements (REM). Recently the modified pressure with stored equalization method (MPSE) has been recommended for use when verifying open non-occluding hearing instruments. The MPSE method does not use a reference microphone to maintain loudspeaker output during real-ear measurements and is therefore susceptible to changes in the signal level at the client's ear which result from movement of the client's head and torso during the verification process. To determine the size of these errors, the real-ear unaided response (REUR) was measured prior to and following the fitting of a non-functioning hearing aid in the contralateral ear. Twenty young adults participated. Identical head positions for the two measurements should yield zero difference measures across all frequencies measured. Loudspeaker-to-client azimuths of 0° and 45° were investigated. Mean difference measures across the frequencies investigated were less than 1dB for both azimuths with one standard deviation from these mean differences typically less than 1.5 dB. Results suggest that the MPSE method does not introduce clinically significant errors in real-ear measurements when verifying hearing instrument fitting in the population examined.

Sumario

Los audiólogos generalmente verifican los instrumentos de audición utilizando mediciones de oído real (REM). Recientemente se ha recomendado el método de la presión modificada con ecualización acumulada (MPSE) para verificar instrumentos de audición abiertos, no oclusivos. El método MPSE no utiliza un micrófono de referencia para mantener la salida de la bocina durante las mediciones de oído real y por ello es susceptible a los cambios en el nivel de la señal en el oído del cliente como resultado de los movimientos de su cabeza y su torso durante el proceso de verificación. Para determinar la dimensión de estos errores, se midió el REUR antes y después de la adaptación de un auxiliar auditivo no funcional en el oído contralateral. Participaron veinte adultos jóvenes. Posiciones de la cabeza idénticas para las dos mediciones debían dar una diferencia de cero en las mediciones en todas las frecuencias. Se investigaron azimuts de 0° y 45° entre cliente y bocina. Las mediciones promedio a través de las frecuencias investigadas fueron menores a 1dB para ambos azimuts con una desviación estándar de estas diferencias promedio, generalmente menores de 1.5dB. Los resultados sugieren que el método MPSE no introduce errores clínicamente significativos en mediciones de oído real cuando se verifica la adaptación de instrumentos de audición en la población examinada.

Acknowledgements

I would like to thank Kirsty Fitzgerald, Janneil Mitchell, Sara Makda, and Bina Patel for their assistance in collecting the data and Bina Patel for assistance with data analysis.

Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.

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