Cnim Exam (184 Questions And Answers) Great Solutions.

When recording a posterior tibial nerve SSEP, the Fpz-C5s channel records 1. subcortical far-field potentials 2. subcortical near-field potentials 3. stationary lumbar potentials 4. erb's point potential {Ans: subcortical far-field potentials}It is most appropriate to monitor the median nerve, not the tibial nerve, for 1. anterior cerebral artery aneurysms 2. middle cerebral artery aneuryms 3. posterior cerebral artery aneurysms 4. vertebral basilar artery aneurysms {Ans: Middle cerebral artery aneurysms}Signal-to-noise ratio relates to which of the following 1. the amplitude of the evoked response components to the amplitude of the unrelated components 2. ability of the instrument to resolve data and noise vertically 3. two inputs of a differential amplifier with like negativity 4. sensitivity scaling {Ans: the amplitude of the evoked response components to the amplitude of the unrelated components}In a normal adult, stimulation of the median nerve at the wrist will 1. elicit a primary cortical response at about 20msec 2. elicit an erb's point response at about 15msec 3. produce a visible twitch in the abductor hallucis muscle 4. elicit a cervical response at approximately 18msec {Ans: elicit a primary cortical response at about 20msec}Early changes to CMAPs during exposure of CN VII are