ACNS Guidelines Questions And Answers Latest Update 2023/2024

ACNS Guidelines Questions And Answers Latest Update 2023/2024 BAER stimulus clicks are comprised of - ANSWER a wide range of frequencies called "broad band" clicks -this activates a wide range of hair cells What is the most appropriate band pass filter of BAER in the OR - ANSWER 100LFF1500HFF ACNS: 100-150 LFF and HFF which can be reduced to 1000Hz What is the suggested derivation for recording all 5 BAER waveforms in 1 channel - ANSWER Ai-Cz as stated in ACNS guidelines What is the duration of a monophasic square wave click stimulus for BAER stimulation (aka pulse width) - ANSWER 100microseconds What is the suggested BAER stimulation, based on acoustic calibration - ANSWER 40- 120 dB SPL (in OR 100-120) which corresponds to 60-70dB HL what is the most appropriate stimulus rate for BAER stimulation - ANSWER ACNS guidelines recommends 5-12hz but higher rates as needed once 30hz waves become diminished. watch out for rates divisible by 60 How many averages are necessary for adequate BAER data acquisition - ANSWER 500-1000 (up to 4000 for clinical diagnostics) Which of the following is not an essential interpretation measurement in BAER monitoring - ANSWER wave II-IV interpeak interval Analysis of BAER interpeak latencies is effective in identifying - ANSWER retrocochlear dysfunction When stimulating the ears sequentially the nons stimulated ear should be masked with a white noise at ........ to eliminate "crossover" responses - ANSWER 30-35dB HL also 60 dB SPL What is the shortcoming of modern interleaved stimulation of BAERs - ANSWER interleaved stim does not allow contralateral masking how can an auditory nerve action potential be recorded directly from the auditory nerve - ANSWER an electrode placed directly on the proximal part of the auditory nerve by the surgeon after exposure Which of the following montages is suggested for recording all 5 BAER waveforms in one channel - ANSWER Mi-Cz (M stands for mandibular which can be placed directly in front of or behind the ear lobe