1|Page
CNIM - ABRET PRACTICE EXAM ALL
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) | GRADED A+ | LATEST |
JUST RELEASED
A 10-bit A/D converter has how many discrete voltage values in
its range? - . . ANSWER ✓✓ 1024
A differential amplifier w/ a gain of 1,000,000 has a 0.2 uV signal
@ its (+) input and 0.8 uV signal @ its (-) input. What is the
output? - . . ANSWER ✓✓ Downward peak = 0.6 uV
A grounding device must be available so that, under nml
conditions, no voltage greater than __________ is measured
across an impedance of 1 kOhm - . . ANSWER ✓✓ 20 mV rms @
60 Hz
A nml curve of the lumbar spine taking place @ 1-2 y/o - . .
ANSWER ✓✓ Kyphosis
A secure method for applying surface cup electrodes requires: -
. . ANSWER ✓✓ collodion + compressed air
,2|Page
A stimulus PW that tends to excite more motor fibers than
sensory fibers: - . . ANSWER ✓✓ 0.5 ms (50 uS)
According to nursing guidelines, how far do you need to be from
the sterile field? - . . ANSWER ✓✓ 18"
Advantage of direct CN VIII recordings - . . ANSWER ✓✓
diminishes need for averaging
Advantages of Dural- or Direct-SSEP SC recordings: - . .
ANSWER ✓✓ Waveforms are higher in amplitude + require fewer
responses
(+) Babinski Sign could indicate - . . ANSWER ✓✓ -severe [UMN]
SC trauma
-abnml PTN SSEPs
(SSEP) A 100 ms epoch is recorded w/ a 10 ms post-stim
triggering. What is the resulting sweep? - . . ANSWER ✓✓ 100 ms
sweep starting 10 ms after the stimulus
(SSEP) If you cannot evaluate motor twitch: - . . ANSWER ✓✓
INC intensity until maximum peripheral signal
,3|Page
(SSEP) In the OR, what is the stim intensity for activating a
sensory nerve? - . . ANSWER ✓✓ no established boundary
(SSEP) Initial waveform recorded of a near-field potential - . .
ANSWER ✓✓ Positive (due to electrotonic dp of the membrane
under the recording electrode)
(SSEP) Pre-stimulus triggering includes: - . . ANSWER ✓✓ a
period of recording before the stimulus
(SSEP) The electrode closest to the post-central gyrus is: - . .
ANSWER ✓✓ -trace after phase reversal occurs
-central sulcus located btwn traces
(SSEP) Which could cause a false negative in a T10 surgery? - . .
ANSWER ✓✓ Asynchronous MN stimulation
10 kHz sampling rate: shortest sine wave resolved = - . .
ANSWER ✓✓ 0.2 ms
30-50% DEC in D-wave amplitude, coupled w/ unchanged MEPs,
predicts which neurological outcome? - . . ANSWER ✓✓ no
changes
, 4|Page
60 Hz artifact would most likely be caused by - . . ANSWER ✓✓
an infusion pump
Advantages of general anesthesia during CEA - . . ANSWER ✓✓
-prevents pt mvmnt; provides brain protection & rapid BP control
-does NOT provide measurement of brain activity
After Discharges (AD) - . . ANSWER ✓✓ -repetitive
electrographic bursts, slowing, and/or spike-wave activity
-occur in response to electrical stimulation @ brain surface
AICA vasospasm: effects on BAER - . . ANSWER ✓✓ complete
loss of all waves EXCEPT cochlear microphonics
Aliasing - . . ANSWER ✓✓ -Erroneous representation of an
analog signal by digital values
-Addition of power @ a freq NOT in the OG signal
Although electrocautery can obliterate EP waveforms, IONM
should be continued by: - . . ANSWER ✓✓ monitoring raw
(unaveraged) data
CNIM - ABRET PRACTICE EXAM ALL
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) | GRADED A+ | LATEST |
JUST RELEASED
A 10-bit A/D converter has how many discrete voltage values in
its range? - . . ANSWER ✓✓ 1024
A differential amplifier w/ a gain of 1,000,000 has a 0.2 uV signal
@ its (+) input and 0.8 uV signal @ its (-) input. What is the
output? - . . ANSWER ✓✓ Downward peak = 0.6 uV
A grounding device must be available so that, under nml
conditions, no voltage greater than __________ is measured
across an impedance of 1 kOhm - . . ANSWER ✓✓ 20 mV rms @
60 Hz
A nml curve of the lumbar spine taking place @ 1-2 y/o - . .
ANSWER ✓✓ Kyphosis
A secure method for applying surface cup electrodes requires: -
. . ANSWER ✓✓ collodion + compressed air
,2|Page
A stimulus PW that tends to excite more motor fibers than
sensory fibers: - . . ANSWER ✓✓ 0.5 ms (50 uS)
According to nursing guidelines, how far do you need to be from
the sterile field? - . . ANSWER ✓✓ 18"
Advantage of direct CN VIII recordings - . . ANSWER ✓✓
diminishes need for averaging
Advantages of Dural- or Direct-SSEP SC recordings: - . .
ANSWER ✓✓ Waveforms are higher in amplitude + require fewer
responses
(+) Babinski Sign could indicate - . . ANSWER ✓✓ -severe [UMN]
SC trauma
-abnml PTN SSEPs
(SSEP) A 100 ms epoch is recorded w/ a 10 ms post-stim
triggering. What is the resulting sweep? - . . ANSWER ✓✓ 100 ms
sweep starting 10 ms after the stimulus
(SSEP) If you cannot evaluate motor twitch: - . . ANSWER ✓✓
INC intensity until maximum peripheral signal
,3|Page
(SSEP) In the OR, what is the stim intensity for activating a
sensory nerve? - . . ANSWER ✓✓ no established boundary
(SSEP) Initial waveform recorded of a near-field potential - . .
ANSWER ✓✓ Positive (due to electrotonic dp of the membrane
under the recording electrode)
(SSEP) Pre-stimulus triggering includes: - . . ANSWER ✓✓ a
period of recording before the stimulus
(SSEP) The electrode closest to the post-central gyrus is: - . .
ANSWER ✓✓ -trace after phase reversal occurs
-central sulcus located btwn traces
(SSEP) Which could cause a false negative in a T10 surgery? - . .
ANSWER ✓✓ Asynchronous MN stimulation
10 kHz sampling rate: shortest sine wave resolved = - . .
ANSWER ✓✓ 0.2 ms
30-50% DEC in D-wave amplitude, coupled w/ unchanged MEPs,
predicts which neurological outcome? - . . ANSWER ✓✓ no
changes
, 4|Page
60 Hz artifact would most likely be caused by - . . ANSWER ✓✓
an infusion pump
Advantages of general anesthesia during CEA - . . ANSWER ✓✓
-prevents pt mvmnt; provides brain protection & rapid BP control
-does NOT provide measurement of brain activity
After Discharges (AD) - . . ANSWER ✓✓ -repetitive
electrographic bursts, slowing, and/or spike-wave activity
-occur in response to electrical stimulation @ brain surface
AICA vasospasm: effects on BAER - . . ANSWER ✓✓ complete
loss of all waves EXCEPT cochlear microphonics
Aliasing - . . ANSWER ✓✓ -Erroneous representation of an
analog signal by digital values
-Addition of power @ a freq NOT in the OG signal
Although electrocautery can obliterate EP waveforms, IONM
should be continued by: - . . ANSWER ✓✓ monitoring raw
(unaveraged) data
