Normative wideband acoustic immittance patterns for middle ear evaluation in dogs.

The objective of this study was to investigate the clinical use of wideband acoustic immittance (WAI) reflectance for middle ear assessment in dogs. Otoscopy and brainstem auditory evoked response testing was performed on all dogs prior to the WAI assessment. Following calibration, dogs were comfortably restrained while the probe was placed into the ear canal to obtain recordings. Testing was repeated for replicability. Repeatable WAI reflectance patterns were observed in 24 dogs, characterized by low-reflectance resonant peaks at approximately 1500-1800 Hz and 3000-4000 Hz. Observed patterns suggest WAI may be a practical means of assessing middle ear function in dogs.

Hearing handicap among adult residents of an urban homeless shelter.

This retrospective study was undertaken to identify the prevalence of hearing loss in the homeless population and its implications for vocational rehabilitation. Audiometric threshold data for adult residents of an urban homeless shelter were collected and reported. Subjects with hearing loss were identified and defined by their binaural high-frequency pure tone average (B-HFPTA). Those subjects were assigned a predicted Hearing Handicap Inventory for Adults-Screener (HHIA-S) score. Their HHIA-S scores, in turn, were used to predict hearing handicap and hearing aid candidacy. Significant hearing handicap was predicted for 35.6% of subjects; 10.6% were identified as hearing aid candidates. These findings have implications for vocational rehabilitation that have not been previously addressed.

Assessment of objective pulsatile tinnitus in a patient with syringohydromyelia.

We examined a 38-year-old male with syringohydromyelia and concomitant symptoms suggestive of intracranial hypertension including unilateral low-frequency sensorineural hearing loss and objective pulsatile tinnitus. The tinnitus was heard by the authors (through a hearing aid stethoscope tube), measured objectively (with a probe microphone), measured subjectively (as minimum masking levels and with fixed frequency Bekesy), and altered by changes in ear canal pressure (subjectively reported and measured objectively with a probe microphone). The audiologic symptoms were likely associated with elevated cerebrospinal fluid pressure that traveled to the cochlea through the cochlear aqueduct. The tinnitus may have originated from pulsations of central vascular structures that traveled through the cochlear aqueduct or the endolymphatic duct. Hearing loss likely resulted from tinnitus masking or a stiffening of the cochlear partition or stapes footplate.

AuD students' perceptions and influences regarding careers in independent practice.

PURPOSE: Independent practice (IP) may be important for the financial stability and autonomy of audiology. The authors sought to identify variables that affect doctor of audiology (AuD) students' decisions to enter IP or another practice setting. METHOD: The authors sent a survey link electronically to 1,430 members of the Student Academy of Audiology; 300 returned completed surveys. RESULTS: Nearly 24% of AuD student participants plan to choose IP immediately upon graduation. Men were more likely than women to choose IP as were those who had an IP rotation and were in the 3rd or 4th year of their AuD program. Important predictors included the survey items "job satisfaction among IP practitioners" and "attractiveness of other specialties"; the "patient contact" perception factor; the "overall job satisfaction" influence factor; and the student age (over 30) demographic variable. CONCLUSIONS: It appears likely that audiology IP rates will remain steady at levels that lag behind the IP rates of other doctoring professions. The authors report some of the variables that appear to have driven current AuD students' career setting choices regarding IP.

Tinnitus loudness tracking: a "type V Békésy" pattern does not exist for pseudotinnitus.

BACKGROUND: Evaluation tools are lacking for the identification of patients exhibiting pseudotinnitus. It was hypothesized that tinnitus loudness traces might show a separation between continuous and pulsed tones for participants exhibiting pseudotinnitus, that is, the "type V" pattern shown for threshold tracking among participants exhibiting pseudohypacusis. It was further hypothesized that tinnitus loudness tracking might reveal unreliable tinnitus loudness matches among participants exhibiting pseudotinnitus due to their lack of an internal tinnitus standard. PURPOSE: To determine whether a tinnitus loudness tracking pattern exists for participants exhibiting pseudotinnitus. RESEARCH DESIGN: Nonrandomized posttest-only control design. The experimental group participants were those without tinnitus, and the control group participants were those with tinnitus. STUDY SAMPLE: There were 86 participants, including 45 with tinnitus and 41 without tinnitus. The participants' hearing varied from normal to severe hearing losses by pure-tone average at 1000, 2000, and 4000 Hz. INTERVENTION: Participants without tinnitus were asked to act as if they had tinnitus and to complete tinnitus loudness matching as if they were trying to convince the test (or computer) that they had tinnitus. DATA ANALYSIS: t-tests RESULTS: There were no statistically significant differences between individuals with tinnitus and participants acting out pseudotinnitus for any of six measures: (1) continuous tone tinnitus loudness tracking; (2) pulsed tone tinnitus loudness tracking; (3) differences between continuous and pulsed tone tinnitus loudness tracking; (4) continuous tone excursion width; (5) pulsed tone excursion width; and (6) differences between continuous and pulsed tone excursion width. CONCLUSIONS: Tinnitus loudness tracking does not appear to hold promise as a clinical tool for the identification of participants exhibiting pseudotinnitus.