CNIM exam 4
1. 4. If an amplifier is rated as having 120dB common mode rejection ratio,which of the following ratios of in-phase to
out-of-phase signals would be expected
ANS10,000:1
100,000:1
500,000:1
1,000,000:1: 1,000,000:1
2. 7. Which of the following opposes any change in current
ANSCapacitance
Impedance Inductance Resistance:
Inductance
The ability of an inductor to store energy in the form of a magnetic field (andconsequently to oppose changes in current) is called
inductance.
3. . Which of the following electrode materials has little electrode potential driftand a
long time constant
ANSTin
Gold
Silver
Stainless steel: Gold
4. With referential recording, maximal amplitude cortical evoked potentialsfollowing stimulation of the left posterior
tibial nerve usually would be found between:
C3 and Cz C4 and
P4Fz and Cz
C4 and Cz: C3 and Cz
Contralateralmedial
cortexdirects the P37
toward ipsilateral
scalp (CPz and CPi)
5. Which of the following will best record the P37 peak following left posteriortibial nerve stimulation
ANS
, CNIM exam 4
CP3
CP4
Fpz
C5S: CP3
Contralateralmedial
cortexdirects the P37
toward ipsilateral
scalp (CPz and CPi)
6. Identification of wave V of the BAEP may requireTympanic electrodes
Bilateral stimulation Decreasing stimulus intensity
Use of a noncephalic reference: Decreasing stimulus intensity. Identification of wave V may require decreasing stim intensity.
Decreasing intensity will cause anincrease in latency making it easier to identify from wave IV.
7. What is the most likely effect of isoflurane at MAC 1.5 on tibialis anteriorCMAP amplitude in response to spinal
stimulation
ANS Marked increase Marked
decreaseMinimal decrease
Minimal increase: Marked decrease because stimulus is on spinal cord above alpha motor neuron meaning a synapse still needs to take
place. Synapses are highly affected by anesthesia. Stimulating on a peripheral nerve would have littleimpact because no synapse.
8. Which of the following is a critical surgical event
ANSDrilling of burr hole in skull
Decorticating of vertebral elements
Placing of muscle plug in the internal auditory canal
Resecting of tumor fragments during acoustic neuroma resection: Resectingof tumor fragments during acoustic neuroma resection
Because it's by/on the brainstem where motor sensory and cranial nerves run.
9. During carotid endarterectomies, Spectral Edge Frequency is usually set to60 67%
70 77%
1. 4. If an amplifier is rated as having 120dB common mode rejection ratio,which of the following ratios of in-phase to
out-of-phase signals would be expected
ANS10,000:1
100,000:1
500,000:1
1,000,000:1: 1,000,000:1
2. 7. Which of the following opposes any change in current
ANSCapacitance
Impedance Inductance Resistance:
Inductance
The ability of an inductor to store energy in the form of a magnetic field (andconsequently to oppose changes in current) is called
inductance.
3. . Which of the following electrode materials has little electrode potential driftand a
long time constant
ANSTin
Gold
Silver
Stainless steel: Gold
4. With referential recording, maximal amplitude cortical evoked potentialsfollowing stimulation of the left posterior
tibial nerve usually would be found between:
C3 and Cz C4 and
P4Fz and Cz
C4 and Cz: C3 and Cz
Contralateralmedial
cortexdirects the P37
toward ipsilateral
scalp (CPz and CPi)
5. Which of the following will best record the P37 peak following left posteriortibial nerve stimulation
ANS
, CNIM exam 4
CP3
CP4
Fpz
C5S: CP3
Contralateralmedial
cortexdirects the P37
toward ipsilateral
scalp (CPz and CPi)
6. Identification of wave V of the BAEP may requireTympanic electrodes
Bilateral stimulation Decreasing stimulus intensity
Use of a noncephalic reference: Decreasing stimulus intensity. Identification of wave V may require decreasing stim intensity.
Decreasing intensity will cause anincrease in latency making it easier to identify from wave IV.
7. What is the most likely effect of isoflurane at MAC 1.5 on tibialis anteriorCMAP amplitude in response to spinal
stimulation
ANS Marked increase Marked
decreaseMinimal decrease
Minimal increase: Marked decrease because stimulus is on spinal cord above alpha motor neuron meaning a synapse still needs to take
place. Synapses are highly affected by anesthesia. Stimulating on a peripheral nerve would have littleimpact because no synapse.
8. Which of the following is a critical surgical event
ANSDrilling of burr hole in skull
Decorticating of vertebral elements
Placing of muscle plug in the internal auditory canal
Resecting of tumor fragments during acoustic neuroma resection: Resectingof tumor fragments during acoustic neuroma resection
Because it's by/on the brainstem where motor sensory and cranial nerves run.
9. During carotid endarterectomies, Spectral Edge Frequency is usually set to60 67%
70 77%
