CNIM EXAM SCRIPT PRACTICE QUESTIONS
AND CORRECT SOLUTIONS
●● What does the sodium potassium pump do?
Answer: Pumps K+ into cell and Na out of cell
●● Which of the following has the greatest effect on SSEP Monitoring?
-Fentanyl
-Diazepam
-Pavulon
-Sevoflourane
Answer: -Diazepam
●● Which of the following is a barbituate?
-Remifentanil
-Methohexital
-Curare
-Nitrous Oxide
Answer: -Methohexital
●● Desflurane has more rapid onset and recovery than isolfurane
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)
in order 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 discern wave IV and V in a BAEP
Answer: Cz-Contralateral ear
●● What are the optimal filter settings for recording 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?
Answer: 60 dB HL
●● What's the most common reason for loss of BAEPs during
retromastoid microvascular decompression?
Answer: Compromised vascular supply
●● During what surgery would you expect a loss of BAEPs in?
Answer: Pontine Glioma
●● After discharges occur after what?
Answer: direct cortical stimulation
●● When no phase reversal is present in an anterior-posterior cortical
grid recording
AND CORRECT SOLUTIONS
●● What does the sodium potassium pump do?
Answer: Pumps K+ into cell and Na out of cell
●● Which of the following has the greatest effect on SSEP Monitoring?
-Fentanyl
-Diazepam
-Pavulon
-Sevoflourane
Answer: -Diazepam
●● Which of the following is a barbituate?
-Remifentanil
-Methohexital
-Curare
-Nitrous Oxide
Answer: -Methohexital
●● Desflurane has more rapid onset and recovery than isolfurane
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)
in order 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 discern wave IV and V in a BAEP
Answer: Cz-Contralateral ear
●● What are the optimal filter settings for recording 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?
Answer: 60 dB HL
●● What's the most common reason for loss of BAEPs during
retromastoid microvascular decompression?
Answer: Compromised vascular supply
●● During what surgery would you expect a loss of BAEPs in?
Answer: Pontine Glioma
●● After discharges occur after what?
Answer: direct cortical stimulation
●● When no phase reversal is present in an anterior-posterior cortical
grid recording
