Practice CNIM SSEP Questions –
Somatosensory Evoked Potentials Practice
Questions for CNIM Exam Preparation
What changes would you see with a right MCA stroke? - ANSWER ✔ Left UPPER cortical responses
decrease in amplitude or lost
What blood vessel is impacted with right PTN cortical loss? - 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 - 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 - 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 - ANSWER ✔ A) N13 --> this is the JUNCTION where medulla & cord intersect (CERVICAL
response)
, Practice CNIM SSEP Questions –
Somatosensory Evoked Potentials Practice
Questions for CNIM Exam Preparation
What is an appropriate filter for a short latency SSEP cortical response? - 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 - 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 - ANSWER ✔ A) 9 cm medial to the L point
What peak and montage is horizontal dipole? - ANSWER ✔ -N13
-C5s-EPc --> C5s is ACTIVE electrode
What electrode would provide you with an N20 response from LEFT median nerve stimulation? -
ANSWER ✔ C4'
What responses would you still have if you have a stroke in the VBA? - 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.
Somatosensory Evoked Potentials Practice
Questions for CNIM Exam Preparation
What changes would you see with a right MCA stroke? - ANSWER ✔ Left UPPER cortical responses
decrease in amplitude or lost
What blood vessel is impacted with right PTN cortical loss? - 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 - 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 - 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 - ANSWER ✔ A) N13 --> this is the JUNCTION where medulla & cord intersect (CERVICAL
response)
, Practice CNIM SSEP Questions –
Somatosensory Evoked Potentials Practice
Questions for CNIM Exam Preparation
What is an appropriate filter for a short latency SSEP cortical response? - 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 - 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 - ANSWER ✔ A) 9 cm medial to the L point
What peak and montage is horizontal dipole? - ANSWER ✔ -N13
-C5s-EPc --> C5s is ACTIVE electrode
What electrode would provide you with an N20 response from LEFT median nerve stimulation? -
ANSWER ✔ C4'
What responses would you still have if you have a stroke in the VBA? - 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.
