1. In BAEP's, cochlear nucleus lesion causes?
Answer: Increased III-V, increased I-V
2. Which modality is most useful in monitoring the integrity of the corticospinal tracts during
resection of an intramedullary spinal cord tumor?
Answer: -D-Waves
3. The stimulus used in a brainstem auditory evoked potential study is a clickwith a peak
acoustic power in the range of
Answer: 2000 to 4000Hz
4. Which of the following tibial nerve responses is not a near field response?-
Answer: N31
5. How many amperes of current will flow in a circuit containing a 2V batteryand 10 ohms of
resistance?
Answer: 0.2 amps
6. In BAEP's blood, betadine or irrigation fluid in tubing causes:
Answer: Increase inabsolute latency, normal inter-peak latencies
7. In averaging, the period of analysis is called or .
Answer: Epoch,sweep length
8. 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?-
Answer: Increase of isoflurane anesthesia
9. Involuntary movement
Answer: Ataxia
10. Smaller surface of stimulating electrodes:
Answer: Higher Current Density
11. During posterior fossa surgery, when BAEPs are used for monitoring brain-stem function, it
is most important to:
Answer: Stimulate and record from the contralateralside
12. P100 of aVEP will have the highest amplitude in which derivation?
Answer: MO-Fz
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