Essentials of Modern Hearing Aids: Selection, Fitting, and Verification
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s of reviews of Effectiveness (darE) and the national guideline clearinghouse (ngc) and categorized as textbooks, review articles, practice guidelines, systematic reviews, and original research. triP (turning research into Practice) database http://www.tripdatabase.com/ searches more than 75 databases, including PubMed, the darE and the ngc, and other evidence-based materials, such as systematic reviews, peer-reviewed journals, guidelines, e-textbooks, expert opinions, patient information. Note. adapted from Wong and Hickson (2012). 1. EVidEncE-BasEd PracticE 11 Disadvantages of systematic reviews include the following: n Very time-consuming n May not be easy to combine studies n May be difficult to find studies that meet criteria of research question In Chapter 5 for example, you will find that we frequently recommend the use of unaided frequencyspecific loudness measures to determine the patient’s loudness discomfort level (LDL). In part, this recommendation is based on the systematic review of Mueller and Bentler (2005). They asked the question: “Are the clinical measurements of LDL for adult patients predictive of aided acceptance and satisfaction of loudness for high inputs in the real world?” Nearly 200 articles were reviewed, and they reported that the evidence supported using unaided LDLs for selecting the maximum real-ear output of hearing aids (no recommendation could be made of aided LDLs — see associated Key Concept). We are aware that many clinics do systematic reviews on various diagnostic and hearing aid issues; of course, this also is a common project for students in their research methods class or perhaps even a capstone project. These reviews often lead to modifications and improvements in the overall hearing aid fitting process.