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Re: Multifrequency Tympanometry

Delta B and delta G are simply subtraction of the peak of tympanogram on B or G from the tail usually positive). You can accomplish the same thing by recording the tympanograms at multiple frequencies. The question is how valid delta B & G are in their automatic mode. You can record them automatically but you also need to do this manually to see whether the values measured manually correspond to automatic mode. As I mentioned earlier we did this in normal adults and otosclerotic patients and the automatic calculation does not correspond to manual calculation in all cases, especially in diseased group. I'm not sure how the outcome will look like in newborns; however, it is very much likely the delta B or G would be even more off from the manual value on the B & G tymps. You can certainly address this issue by recording both, automatic and manual

Navid Shahnaz, Ph.D
Assistant Professor
School of Audiology & Speech Sciences
Faculty of Medicine
5804 Fairview Ave.
Vancouver, B.C. V6t 1Z3
Tel. 604-822-5953
Fax. 604-822-6569
E-mail: nshahnaz@xxxxxxxxxxxxxxxxxx
Website: http://www.audiospeech.ubc.ca/school/faculty/navid/

---------- Original Message ----------------------------------
From: megha jp <meghajp11@xxxxxxxxxxx>
Date:  Mon, 16 Oct 2006 14:01:04 +0100 (BST)

>Hello sir, 
>  Is it possible to establish a range for delta B and delta G in sweep frequency mode considering them as independent parameters, apart for estimating RF and consider delta B and delta G as diagnostic indicators for distinguishing  pathologies. If so, which values of delta B and delta G sholud be considered when using a sweep frequency mode in GSI?
>  With regards,
>  Megha
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