CNIM SSEP Exam Questions with all Correct & 100%
Verified Answers |Latest Version |Already Graded A+
What changes would you see with a right MCA stroke? ✔Correct Answer-Left UPPER cortical
responses decrease in amplitude or lost
What blood vessel is impacted with right PTN cortical loss? ✔Correct Answer-Left ACA
If you get artifact in your subcortical channel you...
A) Ask anesthesia to increase gas
B) Ask surgeon to move retractors
C) Disable the subcortical response
D) Use a spare C5s electrode ✔Correct Answer-D) Use a spare C5s electrode
There were epidural recordings to PTN stim from T5 and from C7. The T5 had a stable response
throughout the tumor surgery, while the C7 had no response and then a great one after the
tumor removal. Where was the tumor?
A) Caudal to T4 & rostral to C7
B) Caudal to T5
C) Rostral to C7
D) Rostral to T6 & Caudal to C7 ✔Correct Answer-D) Rostral to T6 & Caudal to C7
Which component would be most affected by a tumor by where the spinal cord & medulla
intersect?
A) N13
B) P31
C) EP
D) N20 ✔Correct Answer-A) N13 --> this is the JUNCTION where medulla & cord intersect
(CERVICAL response)
What is an appropriate filter for a short latency SSEP cortical response? ✔Correct Answer-10-
3000 Hz (ALWAYS THE ANSWER with 3000 in it!!!)
Lumbar potential is generated from
A) Pre-synaptic responses
B) Post-synaptic responses
C) Spinal ganglion
D) Sciatic nerve ✔Correct Answer-B) Post-synaptic responses
From L to R pre-auricular points is measured 30 cm. The C3 electrode is located
A) 9 cm medial to the L point
B) 6 cm medial to the L point
, C) 18 cm medial to the R point
D) 9 cm to the R point ✔Correct Answer-A) 9 cm medial to the L point
What peak and montage is horizontal dipole? ✔Correct Answer--N13
-C5s-EPc --> C5s is ACTIVE electrode
What electrode would provide you with an N20 response from LEFT median nerve stimulation?
✔Correct Answer-C4'
What responses would you still have if you have a stroke in the VBA? ✔Correct Answer--For
UE : you would still have the cervical (N13) response & Erb's point
-For LE : you would still have the LP & PF response
**VBA perfuses subcortical responses. If stroke occurs, you will not have a subcortical or cortical
response.
If N20 is lost on ONE side? ✔Correct Answer-MCA aclusion
During a scoliosis surgery, you recognize a gradual latency increase of 3.5 msec in the PTN
cortical response, the subcortical response appears to be shifted out almost as much. All
response amplitudes are unchanged. What is the appropriate action to take?
A) Ignore the change, it means nothing.
B) Inform the surgeon immediately that changes consistent with with spinal cord injury may
have occurred. Recommend a wake up test
C) Check the latencies of the PF and MN responses to see if they are also shifted, indicating a
possible temperature effect. Verify this by checking the pt's body temp
D) Ask anesthesia to reduce the gases. You are seeing changes consistent with increased depth
of anesthesia. ✔Correct Answer-C) Check the latencies of the PF and MN responses to see if
they are also shifted, indicating a possible temperature effect. Verify this by checking the pt's
body temp
During a thoracic laminectomy, a rapid loss of the right PTN cortical responses occurs. The
cervical response is too poor to evaluate, the pop fossa responses are unchanged. What should
you do first?
A) Run MN & check anesthetic levels
B) Inform the surgeon immediately & indicate that the changes are consistent with a right hemi-
cord injury
C) Check the right stimulator output with bar electrode
D) Reset the amplifier, check your recording parameters and wait to see if the response returns
✔Correct Answer-B) Inform the surgeon immediately & indicate that the changes are consistent
with a right hemi-cord injury
During an anterior lumbar fusion (L4-5), a loss of all right PTN responses occurs over the course
of about five minutes. What should you do?
Verified Answers |Latest Version |Already Graded A+
What changes would you see with a right MCA stroke? ✔Correct Answer-Left UPPER cortical
responses decrease in amplitude or lost
What blood vessel is impacted with right PTN cortical loss? ✔Correct Answer-Left ACA
If you get artifact in your subcortical channel you...
A) Ask anesthesia to increase gas
B) Ask surgeon to move retractors
C) Disable the subcortical response
D) Use a spare C5s electrode ✔Correct Answer-D) Use a spare C5s electrode
There were epidural recordings to PTN stim from T5 and from C7. The T5 had a stable response
throughout the tumor surgery, while the C7 had no response and then a great one after the
tumor removal. Where was the tumor?
A) Caudal to T4 & rostral to C7
B) Caudal to T5
C) Rostral to C7
D) Rostral to T6 & Caudal to C7 ✔Correct Answer-D) Rostral to T6 & Caudal to C7
Which component would be most affected by a tumor by where the spinal cord & medulla
intersect?
A) N13
B) P31
C) EP
D) N20 ✔Correct Answer-A) N13 --> this is the JUNCTION where medulla & cord intersect
(CERVICAL response)
What is an appropriate filter for a short latency SSEP cortical response? ✔Correct Answer-10-
3000 Hz (ALWAYS THE ANSWER with 3000 in it!!!)
Lumbar potential is generated from
A) Pre-synaptic responses
B) Post-synaptic responses
C) Spinal ganglion
D) Sciatic nerve ✔Correct Answer-B) Post-synaptic responses
From L to R pre-auricular points is measured 30 cm. The C3 electrode is located
A) 9 cm medial to the L point
B) 6 cm medial to the L point
, C) 18 cm medial to the R point
D) 9 cm to the R point ✔Correct Answer-A) 9 cm medial to the L point
What peak and montage is horizontal dipole? ✔Correct Answer--N13
-C5s-EPc --> C5s is ACTIVE electrode
What electrode would provide you with an N20 response from LEFT median nerve stimulation?
✔Correct Answer-C4'
What responses would you still have if you have a stroke in the VBA? ✔Correct Answer--For
UE : you would still have the cervical (N13) response & Erb's point
-For LE : you would still have the LP & PF response
**VBA perfuses subcortical responses. If stroke occurs, you will not have a subcortical or cortical
response.
If N20 is lost on ONE side? ✔Correct Answer-MCA aclusion
During a scoliosis surgery, you recognize a gradual latency increase of 3.5 msec in the PTN
cortical response, the subcortical response appears to be shifted out almost as much. All
response amplitudes are unchanged. What is the appropriate action to take?
A) Ignore the change, it means nothing.
B) Inform the surgeon immediately that changes consistent with with spinal cord injury may
have occurred. Recommend a wake up test
C) Check the latencies of the PF and MN responses to see if they are also shifted, indicating a
possible temperature effect. Verify this by checking the pt's body temp
D) Ask anesthesia to reduce the gases. You are seeing changes consistent with increased depth
of anesthesia. ✔Correct Answer-C) Check the latencies of the PF and MN responses to see if
they are also shifted, indicating a possible temperature effect. Verify this by checking the pt's
body temp
During a thoracic laminectomy, a rapid loss of the right PTN cortical responses occurs. The
cervical response is too poor to evaluate, the pop fossa responses are unchanged. What should
you do first?
A) Run MN & check anesthetic levels
B) Inform the surgeon immediately & indicate that the changes are consistent with a right hemi-
cord injury
C) Check the right stimulator output with bar electrode
D) Reset the amplifier, check your recording parameters and wait to see if the response returns
✔Correct Answer-B) Inform the surgeon immediately & indicate that the changes are consistent
with a right hemi-cord injury
During an anterior lumbar fusion (L4-5), a loss of all right PTN responses occurs over the course
of about five minutes. What should you do?
