Aid Dispenser Written Exam

what are some possible causes for meniere's disease? {Ans: infection, degeneration of middle ear, blow to the head (aside from the excess endolymph present as noted in another card)}tests for acoustic neuroma {Ans: PIPB (rollover test), acoustic reflex delay, tone decay, ABR, MRI}class D amplifier {Ans: aka "swiching amplifier" - designed to decrease drain on the battery (current only flows when there is input) while providing close to class B power levels. clearer sound quality w/ no peak clipping and most efficient}rhine test (tuning fork) {Ans: compares the sensitivity by bone conduction to air conduction through the mastoid. primarily for evaluating loss of hearing in one ear}automatic directionality {Ans: HA doesnt need to be manually adjusted. The environmental classifier determines when it is directional or omnidirectional automatically}annular ligament {Ans: footplate of stapes that is held in the oval window}procedure done to fix perforation {Ans: tympanoplasty or myringoplasty}pars tensa {Ans: lower 4/5 of TM and tight}binaural degradation {Ans: when the binaural WR score is lower than the better ear WR score. medical referral required}tone decay test {Ans: is used in audiology to detect and measure auditory fatigue. behavioral test}type C tympanogram