CNIM study questions with complete solutions

You record a spinal potentialto: correct answer: Establish an Action potential (AP) What drugs would you use for language mapping? correct answer: Fentanyl D waves are recorded form which of the following electrodes? correct answer: Epidural electrodes over the spinal cord. Horizontal Dipole: correct answer: P14 What nerve roots are being monitored using the Peroneus longus muscle? correct answer: L5-S2 Which is the main reason for measuring impedances of all electrodes? correct answer: To evaluate the electrode contact. When is leakage current present in an evoked potential instrument? correct answer: Whenever the instrument is connected to a power source Which will enhance the analog to digital conversion? correct answer: Ensure that the range is appropriate to the size of the signal being recorded What is the maximum allowable leakage of evoked potential instrument chassis current? correct answer: 100 microamperes What is the most likely effect of isoflurane at MAC 1.5 on tibialis anterior CMAP amplitude in response to spinal stimulation? correct answer: Marked decrease Intraoperative evoked potential monitoring criteria of abnormality are based on a comparison of amplitude and latency to correct answer: Postincision baseline Fentanyl infusion will: correct answer: Increase latency and decrease amplitude With referential recording, maximal amplitude cortical evoked potentials following stimulation of the left posterior tibial nerve usually would be found between: correct answer: C3 and Cz