CNIM TEST| 254 QUESTIONS| WITH COMPLETE SOLUTIONS

In BAEP's, cochlear nucleus lesion causes? correct answer: Increased III-V, increased I-V Which modality is most useful in monitoring the integrity of the corticospinal tracts during resection of an intramedullary spinal cord tumor? correct answer: D-Waves The stimulus used in a brainstem auditory evoked potential study is a click with a peak acoustic power in the range of correct answer: 2000 to 4000Hz Which of the following tibial nerve responses is not a near field response? correct answer: N31 How many amperes of current will flow in a circuit containing a 2V battery and 10 ohms of resistance? correct answer: 0.2 amps In BAEP's blood, betadine or irrigation fluid in tubing causes: correct answer: Increase in absolute latency, normal inter-peak latencies In averaging, the period of analysis is called _______ or ________. correct answer: Epoch, sweep length While monitoring BAEP, there was a prolongation of wave I through V by more than 2 msec. Which of the following choices is NOT a possible cause? correct answer: Increase of isoflurane anesthesia Involuntary movement correct answer: Ataxia Smaller surface of stimulating electrodes: correct answer: Higher Current Density During posterior fossa surgery, when BAEPs are used for monitoring brainstem function, it is most important to: correct answer: Stimulate and record from the contralateral side P100 of a VEP will have the highest amplitude in which derivation? correct answer: MO-Fz Cranial nerve VII must be monitored concurrently with BAERs. correct answer: True Nerves of the body, such as median, ulnar, and femoral are formed from the: correct answer: Dorsal and ventral rami Upper motor neuron extends from: correct answer: Precentral