Are there any suggested fitting protocols to following with regards to fitting a patient with hearing aids who has been identified as having cochlear dead regions? Do protocols differ depending on whether the dead region is in the low frequency range versus the high frequency range? 35 AudiologyOnline Ask the Expert
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ANSWER: A PVB is a mechanical backflow preventer that consists of an independently acting, spring-loaded check valve and an independently acting, spring-loaded, air inlet valve on the discharge side of the check valve. It includes shutoff valves at each end of the assembly and is eqipped with test cocks.