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CNIM – SSEP EXAM QUESTIONS AND VERIFIED ANSWERS
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CNIM – SSEP EXAM QUESTIONS AND VERIFIEDANSWERS
When recording a PTN SSEP, the Fpz-Cs5 channel records. - ANSWER N34
Subcortical far-field potentials;In the 10-20 system of electrode placement, the
point 20% (of the nasion-ion distance) anterior to Cz is called. - ANSWER
Fz;An electrode measured 20% lateral to Cz on the right using 10-20 system is.
- ANSWER C4; P14 is a far-field, subcortically generated response which
probably reflects. - ANSWER Caudal medial lemniscal activity
Upper SSEPs;If greater than three hours the PTN cortical response decays while
subcortical remains steady. - ANSWER Continue to monitor subcorticals;In
general, filter settings for SSEP recordings. - ANSWER Can be narrower for
cortical than peripheral responses; The first waveform recorded of a near-field
PTN cortical potential is. - ANSWER Positive due to electronic depolarization
of the membrane under the recording electrode.; A patient is admitted to the OR
diagnosed with a herniated cervical disc at C5-6. The most appropriate nerves to
monitor during the resulting surgical procedure would be the. - ANSWER MN
and PTN; SSEPs are most likely to be highly variable and less reliable in
patients with. - ANSWER Neuromuscular disease;Lower extremity SSEPs are
transmitted through the. - ANSWER Gracilis Nucleus; Stimulation of the motor
pathway at the spinal cord can be achieved with little movement in the surgical
field by. - ANSWER Increasing the stimulation rate enough to produce muscle
tetany.;Tetany - ANSWER The involuntary contraction of muscles.;What upper
extremity somatosensory response is considered a stationary potential? L13
Generated by the spinal cord
Near-field potential
Blood supply via posterior spinal arteries.;A 60 Hz notch filter should not be
used during recording, because this may. - L13
Introduce ringing artifact that may adulterate the appearance of the
response.;During monitoring of SSEPs, dural or direct cord recordings are
advantageous because. - ANSWER The waveforms are higher in amplitude and
require fewer averages.
Electrical amplitude of the SSEP is. - ANSWER 0.1 to 10 uV
The advantage of referential, as opposed to bipolar recording of spinal cord
SSEPs, is. - ANSWER Avoiding cancellation of the potentials as a result of
recording from adjacent levels.
What is the main advantage of asynchronous bilateral stimulation? - ANSWER
Differentiation of local vs. systemic effects;What is the best monitoring strategy
for a C7 fracture? - ANSWER UN and PTN SSEPs;MN SSEP produces a wave
, at the brachial plexus designated. - ANSWER N9;The SSEP reaches adult form
and latency by. - ANSWER 8 years;SSEP stimulating electrodes should be
placed with. - ANSWER The negative electrode proximal;
The MN SSEP can be helpful as a measure of. - ANSWER Cerebral blood flow;
The duration of a monophasic, rectangular pulse used for somatosensory
stimulation should be. - ANSWER 0.2 ms;
Upper extremity SSEP are transmitted through the. - ANSWER Cuneate
nucleus;On the SSEP, the electrode at _____ records a spinal cord response -
ANSWER T12;The earliest obligate component of the MN SSEP that is
measured far-field is generated in the. - ANSWER Medial lemniscus;What is
the best montage to use to evaluate dorsal column activity? - ANSWER Cs5-
EPc;The conduction time from the cervical response to the primary MN cortical
response is. - ANSWER 7 msec;The central conduction time for MN SSEP is.
- ANSWER P14-N20;PTN SSEPs can detect lesions of. - ANSWER
Proprioceptive fibers;Eliciting a motor twitch with PTN stimulation, you expect
to see. - ANSWER Plantar flexion of the toes;One difference between PTN and
Peroneal responses is that Peroneal. - ANSWER Has a shorter latency;PTN
SSEP responses will be most likely affected if the patient has. - ANSWER
Ataxia;Prolonged MN responses including Erb's point is most likely due to. -
ANSWER Pinched peripheral vessel;One advantage of PTN over Peroneal is
that. - ANSWER Other Pop fossa may be used to assess PTN
stimulation;Which of the following montage would you use to confirm an
abnormality in the Cz'-Fz cortical response to PTN. - ANSWER CPc-CPi;What
is central conduction time for PTN SSEP in the. - ANSWER LP - P37;When
stimulating a normal adult MN at the wrist you would. - ANSWER Elicit a
primary cortical response at about 20 msec;Monitoring somatosensory function
will most likely fail to recognize changes in. - ANSWER Anterior spinal cord
function;To record the compound action potential of the MN intraoperatively,
the electrode should be placed at the. - ANSWER The antecubital fossa;In
order to stimulate both tibial nerves asynchronously you need. - ANSWER To
delay the second stimulator;During tibial nerve stimulation, a decreased nerve
conduction velocity between the pop fossa and L3 potential, with normal NCV
to the pop fossa indicates. - ANSWER A lesion between the pop fossa and the
caudal equina.;Direct focal electrical stimulation of a peripheral nerve lesion
will. - ANSWER More precisely localize the distribution of intact conducting
nerve fibers.
To record cortical SSEPs during intraoperative monitoring of the thoracolumbar
spinal cord, an electrode should be placed: - ANSWER 2 cm posterior Cz;
If the PTN is stimulated at the ankle, stimulation can be verified by. - ANSWER
Recording a response from the pop fossa;The proposed site of recording for the
cervical cord response to MN stimulation is. - ANSWER CS5;Using a montage
with C5 spine to Fpz, with stimulation of the lower extremity the response can
be generated at the. - ANSWER Caudal medial lemniscus and is a far-field
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