CNIM Exam Questions to Re-Study With
Accurate Answers
What is the first event that happens when the threshold for an action potential is
reached on a neuron? - ANSWER Voltage gated Sodium channels open
What does the sodium potassium pump do? - ANSWER Pumps K+ into cell and Na out of
cell
Which of the following has the greatest affect on SSEP Monitoring?
-Fentanyl
-Diazepam
-Pavulon
-Sevoflourane - ANSWER -Diazepam
What is the following is a barbituate?
-Remifentanil
-Methohexital
-Curare
-Nitrous Oxide - ANSWER -Methohexital
Desflurane has more rapid onset and recovery than Isoflurane because: - ANSWER
Desflurane has a HIGHER blood solubility than Isoflurane
Which SSEP peaks are more affected by Desflurane? - ANSWER -Later cortical peaks
will be more affected than earlier peaks, so if you're comparing N20 to P100 the answer
will be P100
,What will fentanyl infusion do to our signals? - ANSWER Increase latency and decrease
amplitude
If you have a lot of high frequency noise in your BAEPs you can change your filter from:
-ANSWER 2500-1500 Hz
If sound intensity is increased from 20 dB to 40 dB then the sound pressure has
increased by a factor of?
What is SPL and its equation? -ANSWER 10
-SPL is sound pressure level, the equation for it i:
dB= 20log(Pressure)
to find the factor by which sound intensity has increased by, plug in dB, solve for P, and
divide the two Ps
Where is BAEP wave V generated - ANSWER midbrain
In BAEPs, what do CNS depressants cause? - ANSWER Minimal effects in BAEPs
For audiograms, threshold of hearing is measured in - ANSWER dB HL
What montage will help you to identify wave IV and V in a BAEP - ANSWER
Cz-Contralateral ear
What is the optimal filter settings to record BAEPs? - ANSWER 10-30 Hz to 2500-3000 Hz
Optimal repetition rate for BAEPs?
, Most Appropriate ISI for BAEPs? - ANSWER RR: 56 Hz
ISI: 33-90 ms
Acceptable sweep for BAEPs?
Appropriate analysis time for BAEPs? - ANSWER Sweep: 10-15 msec
Analysis time: 15 mS
BAEPs: masking level of what to eliminate crossover? - ANWER 60 dB HL
What is the most common cause of loss of BAEPs during retromastoid microvascular
decompression? - ANWER Compromised vascular supply
In what surgery would you expect a loss of BAEPs in? - ANWER Pontine Glioma
After discharges occur after what? - ANWER direct cortical stimulation
When there is no phase reversal in an anterior-posterior cortical grid recording -
ANSWER The maximum amplitude response is closest to the central sulcus
Where is the post central gyrus in regard to phase reversal? - ANSWER The
line/response before the reversal
What pharmacologic agents are used during language mapping? - ANSWER Fentanyl
Accurate Answers
What is the first event that happens when the threshold for an action potential is
reached on a neuron? - ANSWER Voltage gated Sodium channels open
What does the sodium potassium pump do? - ANSWER Pumps K+ into cell and Na out of
cell
Which of the following has the greatest affect on SSEP Monitoring?
-Fentanyl
-Diazepam
-Pavulon
-Sevoflourane - ANSWER -Diazepam
What is the following is a barbituate?
-Remifentanil
-Methohexital
-Curare
-Nitrous Oxide - ANSWER -Methohexital
Desflurane has more rapid onset and recovery than Isoflurane because: - ANSWER
Desflurane has a HIGHER blood solubility than Isoflurane
Which SSEP peaks are more affected by Desflurane? - ANSWER -Later cortical peaks
will be more affected than earlier peaks, so if you're comparing N20 to P100 the answer
will be P100
,What will fentanyl infusion do to our signals? - ANSWER Increase latency and decrease
amplitude
If you have a lot of high frequency noise in your BAEPs you can change your filter from:
-ANSWER 2500-1500 Hz
If sound intensity is increased from 20 dB to 40 dB then the sound pressure has
increased by a factor of?
What is SPL and its equation? -ANSWER 10
-SPL is sound pressure level, the equation for it i:
dB= 20log(Pressure)
to find the factor by which sound intensity has increased by, plug in dB, solve for P, and
divide the two Ps
Where is BAEP wave V generated - ANSWER midbrain
In BAEPs, what do CNS depressants cause? - ANSWER Minimal effects in BAEPs
For audiograms, threshold of hearing is measured in - ANSWER dB HL
What montage will help you to identify wave IV and V in a BAEP - ANSWER
Cz-Contralateral ear
What is the optimal filter settings to record BAEPs? - ANSWER 10-30 Hz to 2500-3000 Hz
Optimal repetition rate for BAEPs?
, Most Appropriate ISI for BAEPs? - ANSWER RR: 56 Hz
ISI: 33-90 ms
Acceptable sweep for BAEPs?
Appropriate analysis time for BAEPs? - ANSWER Sweep: 10-15 msec
Analysis time: 15 mS
BAEPs: masking level of what to eliminate crossover? - ANWER 60 dB HL
What is the most common cause of loss of BAEPs during retromastoid microvascular
decompression? - ANWER Compromised vascular supply
In what surgery would you expect a loss of BAEPs in? - ANWER Pontine Glioma
After discharges occur after what? - ANWER direct cortical stimulation
When there is no phase reversal in an anterior-posterior cortical grid recording -
ANSWER The maximum amplitude response is closest to the central sulcus
Where is the post central gyrus in regard to phase reversal? - ANSWER The
line/response before the reversal
What pharmacologic agents are used during language mapping? - ANSWER Fentanyl
