CNIM STUDY SET QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS

Extreme retraction of the Cerebellar during BAEP correct answer: Loss of all waveforms due to vascular compromise Effect of drilling during BAEP correct answer: Highly variable, causes temporary threshold change, and prolongs wave 5 Effects of retracting during CPA correct answer: Ipsilateral prolongation of 1-5 inter peak interval Manipulation of Vestiblocochlear nerve correct answer: Changes seen in wave 1 Wave 1 from cochlear microphonic correct answer: Alternating polarity How to enhance amplitude of wave 5 in BAEP correct answer: Condensation clicks instead of rarefaction Montage that will not show wave 1 due to CMMR correct answer: CZ-FPz Retrocochlear hearing loss correct answer: Prolonged inter peak interval 1-5 What do you monitor for posterior fossa craniotomy for large tumor correct answer: Contra lateral BAEP, median SSEP, facial nerve What modalities should you monitor for Vestibular Neurectomy correct answer: Ipsilateral BAEP and facial nerve What happens if the 8t cranial nerve is transected correct answer: Absence of all waves 1-5 What is least likely to cause 60hz artifact on BAEP correct answer: Pneumatic drill Wave 1 latency is affected by how many ms due to tubal inserts correct answer: +0.9ms What do you do if you cannot get a wave 1 response correct answer: Run ECochg What surgical approach on the side of tumor is hearing sacrificed correct answer: Translabyrinthine