If the OR is very cold, what component of your median nerve SSEPs would you most likely expect to see changes in latency?
a. N20
b. N13
c. N9
d. all waveforms - Answer all waveforms
In posterior fossa craniotomy surgery for a large tumor with unilateral hearing loss, the appropriate modali...
SSEPs questions with correct answers
If the OR is very cold, what component of your median nerve SSEPs would you most likely expect to see changes in latency?
a. N20
b. N13
c. N9
d. all waveforms - Answer all waveforms
In posterior fossa craniotomy surgery for a large tumor with unilateral hearing loss,
the appropriate modalities to monitor would be:
a. contralateral BAER, median nerve SSEP, and facial nerve
b. ipsilateral BAER and facial nerve
c. facial nerve and contralateral median nerve
d. ipsilateral BAER - Answer contralateral BAER, median nerve SSEP, and facial
nerve
What is the effect on SSEPs of 50 ug/kg fentanyl?
a. increased latency, decreased amplitude
b. no change
c. decreased latency, increased amplitude
d. slightly increased latency, no change in amplitude - Answer slightly increased latency, no change in amplitude
In order to record cortical SSEPs during intraoperative monitoring of the thoracolumbar spinal cord, and electrode should be placed:
a. 2 cm posterior to Pz
b. 2 cm anterior to Cz c. 2 cm posterior to Cz
d. 2 cm posterior to C3 and C4 - Answer 2 cm posterior to Cz
(for maximal recording of P37 since sx is thoracolumbar)
Unstable blood pressure during SSEP monitoring in the OR affects cortical EPs resulting in:
a. fluctuating latencies
b. fluctuating amplitudes
c. fluctuating amplitudes and latencies
d. minimal change is the body temperature is maintained above 32 degrees C - Answer b. fluctuating amplitudes
A patient in a state of surgical anesthesia using N2O is likely to have a drop in SSEP amplitudes of a. 50%
b. 75%
c. 30%
d. 99% - Answer b. 75%
Which of the following best describes the value of the collecting pre-operative baseline SSEPs?
a. pre-op baselines have no value
b. the SSEPs immediately following critical events of the surgery can be compared
to the pre-op baselines
c. pre-op data are useful for ruling out the effects of anesthesia
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