In BAEP's, cochlear nucleus lesion causes?
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?
D-Waves
The stimulus used in a brainstem auditory evoked potential...
CNIM TEST
In BAEP's, cochlear nucleus lesion causes? correct answerIncreased 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 answerD-Waves
The stimulus used in a brainstem auditory evoked potential study is a click with a peak acoustic power in
the range of correct answer2000 to 4000Hz
Which of the following tibial nerve responses is not a near field response? correct answerN31
How many amperes of current will flow in a circuit containing a 2V battery and 10 ohms of resistance? correct answer0.2 amps
In BAEP's blood, betadine or irrigation fluid in tubing causes: correct answerIncrease in absolute latency,
normal inter-peak latencies
In averaging, the period of analysis is called _______ or ________. correct answerEpoch, 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 answerIncrease of isoflurane anesthesia
Involuntary movement correct answerAtaxia
Smaller surface of stimulating electrodes: correct answerHigher Current Density
During posterior fossa surgery, when BAEPs are used for monitoring brainstem function, it is most important to: correct answerStimulate and record from the contralateral side P100 of a VEP will have the highest amplitude in which derivation? correct answerMO-Fz
Cranial nerve VII must be monitored concurrently with BAERs. correct answerTrue
Nerves of the body, such as median, ulnar, and femoral are formed from the: correct answerDorsal and ventral rami
Upper motor neuron extends from: correct answerPrecentral gyrus to ventral horn
Increasing the stimulus rate of BAEPs correct answerDecreases amplitude and increases latency
Which of the following is the normal interocular latency difference of P100? correct answerLess than 15 msec
An amplifier sensitivity setting that produces a vertical deflection of 1cm with an input of 10mV is: correct answer1mV/mm
When identifying wave IV and V of a BAEP, which of the following would be most helpful? correct answerCz-Contra ear montage
The maximum leakage current should be correct answer100 uA
Wave V is usually the most prominent peak after correct answer5.5 msec
Which of the following montages will best demonstrate waves I through V of the BAEP? correct answerCz-ipsilateral ear
P13 Generator correct answerSpinomedullary junction
An electrode recording from Erb's point is placed correct answer2-3 cm above the clavicle In BAEP's, perforated or hardened tympanic membrane causes: correct answerIncrease in absolute latency, normal inter-peak latencies
Which of the following temperatures should be annotated as being hypothermic? correct answer34 degrees C
Dyskinesia: correct answerAbnormal Movement
Sensory supply of the posterior 1/3rd of the tongue is from which nerve? correct answerGlossopharyngeal
What is the best montage for distinguishing a IV/V complex? correct answerCz-Contra Ear
Loss of a unilateral waveform is never a concern as long as wave V is present on the other ear. correct answerFalse
Which of the following are thalamic nuclei for the somatosensory pathway? correct answerVPL nucleus
What does an increased N13-N20 central conduction time with normal N9-N20 conduction time and a normal nerve conduction velocity indicate? correct answerDefect above the lower medulla at or below the somatosensory cortex
The effect of hypotension on the evoked potential is: correct answerDecreased amplitude, increased latency
Using an amplification factor of 500,000, a 1uV brainstem auditory evoked potential waveform will be amplified to correct answer0.50v
Which of the following monitoring modes is LEAST useful for skull base surgery? correct answerTibial nerve SSEP
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