CNIM PRACTICE EXAM 1
What significant EEG change would you expect to see with ischemia due to
carotid clamping? - ANSWERS-Increased slow activity
Loss of BAEP's following drilling of the internal auditory canal is most likely due
to? - ANSWERS-Disruption of the cochlear blood supply
The effects of pharmacological or surgical manipulations can be mimicked by the
inappropriate manipulation of: - ANSWERS-Filter settings
In order to assess the stimulating circuitry, stimulating electrodes, and the
peripheral nerve while recording SSEPs intraoperatively, the peripheral nerve
________ should also be recorded. - ANSWERS-TCeMEP
A recommendation to minimize stimulus artifact while recording BAEPs
intraoperative is to? - ANSWERS-Use alternating clicks
The suggested rate for stimulation for intraoperative posterior tibial nerve evoked
potential monitoring is: - ANSWERS-2 to 10 per second
Because generator sites are typically deep within anatomic structures, most EPs
are considered to be - ANSWERS-Far-field responses
,An optimal repetition rate for intraoperative BAEP's is? - ANSWERS-31 Hz
Epidural recording are most affected by: - ANSWERS-Spinal instrumentation
The prominent wave for monitoring of BAEP's is: - ANSWERS-Wave V
What is the effect on SSEP's of 50 ug/kg Fentanyl? - ANSWERS-Increased latency,
decreased amplitude
Bipolar electrodes are used for localization of: - ANSWERS-Signals via phase
reversal
For spinal cord monitoring, epidural electrodes should be placed: - ANSWERS-
Rostral to the surgical site
For good recordings, you must have: - ANSWERS-High input impedance, low
electrode impedance
If the highest frequency component of an evoked potential is 400 Hz, then the
minimum sampling rate required to accurately represent the signal is: -
ANSWERS-800 Hz
Which of the following will have the least effect on median nerve responses? -
ANSWERS-Atracurium
,Excessive 60 Hz noise on a signal channel implies: - ANSWERS-Impedance
mismatch of the electrodes in that channel
Sensation Level (SL) is defined by: - ANSWERS-An individual's hearing threshold
During middle or posterior fossa surgery, what structure is most at risk? -
ANSWERS-Brainstem
PTN SSEP responses will be most likely affected if the patient has: - ANSWERS-
Ataxia
If the microscope is causing excessive 60 Hz noise you should? - ANSWERS-If the
microscope is
Check to make sure your amplifier cable isn't crossing
One advantage of PTN over Peroneal is that: - ANSWERS-Popliteal fossa can be
used to evaluate PTN stimulation
All of the following are true of "informed consent" for an operative procedure
except? - ANSWERS-The patient may have sedation before the consent is signed
A "beanbag" is often used: - ANSWERS-In the lateral position
, SSEP recordings are often abnormal with the following abnormal symptoms
except: - ANSWERS-Pain
The BAEP wave which is most degraded when the auditory nerve is damaged is
likely to be: - ANSWERS-WAVEII
Changing from standard headphones to insert transducers connected by plastic
tubing will change in the latency of wave I by about: - ANSWERS-+1 MSEC
Transcranial magnetic and electrical motor evoked potentials:? - ANSWERS-Are
primarily generated in the lateral corticospinal tracts
A stimulus rate that is not suitable for BAER is: - ANSWERS-20.0
ABR Wave V will increase in latency about: - ANSWERS-0.2 ms per degree
centigrade
Which of the following would most likely be monitored with transcranial Doppler
during a carotid endarterectomy? - ANSWERS-MCA
Alpha activity: - ANSWERS-Is often 50% greater in amplitude over the right
hemisphere
What significant EEG change would you expect to see with ischemia due to
carotid clamping? - ANSWERS-Increased slow activity
Loss of BAEP's following drilling of the internal auditory canal is most likely due
to? - ANSWERS-Disruption of the cochlear blood supply
The effects of pharmacological or surgical manipulations can be mimicked by the
inappropriate manipulation of: - ANSWERS-Filter settings
In order to assess the stimulating circuitry, stimulating electrodes, and the
peripheral nerve while recording SSEPs intraoperatively, the peripheral nerve
________ should also be recorded. - ANSWERS-TCeMEP
A recommendation to minimize stimulus artifact while recording BAEPs
intraoperative is to? - ANSWERS-Use alternating clicks
The suggested rate for stimulation for intraoperative posterior tibial nerve evoked
potential monitoring is: - ANSWERS-2 to 10 per second
Because generator sites are typically deep within anatomic structures, most EPs
are considered to be - ANSWERS-Far-field responses
,An optimal repetition rate for intraoperative BAEP's is? - ANSWERS-31 Hz
Epidural recording are most affected by: - ANSWERS-Spinal instrumentation
The prominent wave for monitoring of BAEP's is: - ANSWERS-Wave V
What is the effect on SSEP's of 50 ug/kg Fentanyl? - ANSWERS-Increased latency,
decreased amplitude
Bipolar electrodes are used for localization of: - ANSWERS-Signals via phase
reversal
For spinal cord monitoring, epidural electrodes should be placed: - ANSWERS-
Rostral to the surgical site
For good recordings, you must have: - ANSWERS-High input impedance, low
electrode impedance
If the highest frequency component of an evoked potential is 400 Hz, then the
minimum sampling rate required to accurately represent the signal is: -
ANSWERS-800 Hz
Which of the following will have the least effect on median nerve responses? -
ANSWERS-Atracurium
,Excessive 60 Hz noise on a signal channel implies: - ANSWERS-Impedance
mismatch of the electrodes in that channel
Sensation Level (SL) is defined by: - ANSWERS-An individual's hearing threshold
During middle or posterior fossa surgery, what structure is most at risk? -
ANSWERS-Brainstem
PTN SSEP responses will be most likely affected if the patient has: - ANSWERS-
Ataxia
If the microscope is causing excessive 60 Hz noise you should? - ANSWERS-If the
microscope is
Check to make sure your amplifier cable isn't crossing
One advantage of PTN over Peroneal is that: - ANSWERS-Popliteal fossa can be
used to evaluate PTN stimulation
All of the following are true of "informed consent" for an operative procedure
except? - ANSWERS-The patient may have sedation before the consent is signed
A "beanbag" is often used: - ANSWERS-In the lateral position
, SSEP recordings are often abnormal with the following abnormal symptoms
except: - ANSWERS-Pain
The BAEP wave which is most degraded when the auditory nerve is damaged is
likely to be: - ANSWERS-WAVEII
Changing from standard headphones to insert transducers connected by plastic
tubing will change in the latency of wave I by about: - ANSWERS-+1 MSEC
Transcranial magnetic and electrical motor evoked potentials:? - ANSWERS-Are
primarily generated in the lateral corticospinal tracts
A stimulus rate that is not suitable for BAER is: - ANSWERS-20.0
ABR Wave V will increase in latency about: - ANSWERS-0.2 ms per degree
centigrade
Which of the following would most likely be monitored with transcranial Doppler
during a carotid endarterectomy? - ANSWERS-MCA
Alpha activity: - ANSWERS-Is often 50% greater in amplitude over the right
hemisphere
