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Before the neonates underwent DPOAE testing (Madsen AccuScreen; GN Otometrics; Schaumburg, 111.
One of the things that really interests me--and that I don't know the answer to-is what does that kind of a decrease [in DPOAE amplitude] mean?
Another proposed DPOAE protocol involves the use of test-retest reference limits based on normal variability in serial DPOAE level plotted as a function of f2 frequency levels obtained in a nonexposed (to cisplatin) group of Veteran research participants.
Hearing thresholds measured in pre- and post-test conditions were compared along with averaged DPOAE amplitudes of the two pre-match recordings and the two post-match recordings, using the Wilcoxon signed-rank test for repeated measurements on a single sample.
A moderate DPOAE was observed in the left ear (6 dB SPL at 1.
Before evaluating the association between PCBs and DPOAE measures, participants in the 45-month follow-up were compared with those in the original Michalovce birth cohort with regard to sociodemographic factors and maternal PCB-153 concentration.
TOAE and DPOAE tests are essentially screening tools; they cannot be used to predict or determine the degree of hearing loss because neither can be reliably recorded in ears that have conductive pathology or in patients who have more than a moderate degree of sensorineural hearing loss.
Abbreviations: C&P = Compensation and Pension, CAP = central auditory processing, CAPD = central auditory processing disorder, dBHL = decibels hearing loss, DPOAE = distortion product otoacoustic emission, IED = improvised explosive device, NSI = Neurobehavioral Symptom Inventory, OAE = otoacoustic emission, RPG = rocket-propelled grenade, SD = standard deviation, TBI = traumatic brain injury, VA = Department of Veterans Affairs, VHA = Veterans Health Administration.
We retrospectively reviewed our clinical records in reverse chronological order from December 2007 back to January 2005 to find children who had (1) undergone unilateral or bilateral placement of transtympanic ventilation tubes, (2) who had been treated with neomycin/ polymyxin B/hydrocortisone ear drops, and (3) who had been evaluated postoperatively with DPOAE testing.
We analyzed the DPOAE and CAP data using two-way analysis of variance (ANOVA) and performed Bonferroni post hoc tests using GraphPad Prism (version 4.
Although authors have reported the superiority of DPOAE measurements over pure-tone audiometry for the detection of early hearing loss, the latter is still reliable.
With the use of conventional methods and DPOAE, we found that 19 of the 23 patients (83%) had a sensorineural hearing loss--nine (75%) type I patients and 10 (91%) type II patients.