CNIM - ABRET Practice Exam Questions
with Correct 5-Star Rated Answers.
Graded A+
(+) Babinski Sign could indicate - ANS-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? - ANS100 ms sweep starting 10 ms after the stimulus
(SSEP) If you cannot evaluate motor twitch: - ANSINC intensity until maximum
peripheral signal
(SSEP) In the OR, what is the stim intensity for activating a sensory nerve? - ANSno
established boundary
(SSEP) Initial waveform recorded of a near-field potential - ANSPositive (due to
electrotonic dp of the membrane under the recording electrode)
(SSEP) Pre-stimulus triggering includes: - ANSa period of recording before the stimulus
(SSEP) The electrode closest to the post-central gyrus is: - ANS-trace after phase
reversal occurs
-central sulcus located btwn traces
(SSEP) Which could cause a false negative in a T10 surgery? - ANSAsynchronous MN
stimulation
10 kHz sampling rate: shortest sine wave resolved = - ANS0.2 ms
30-50% DEC in D-wave amplitude, coupled w/ unchanged MEPs, predicts which
neurological outcome? - ANSno changes
60 Hz artifact would most likely be caused by - ANSan infusion pump
A 10-bit A/D converter has how many discrete voltage values in its range? - ANS1024
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? - ANSDownward 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 - ANS20 mV rms @ 60
Hz
,A nml curve of the lumbar spine taking place @ 1-2 y/o - ANSKyphosis
A secure method for applying surface cup electrodes requires: - ANScollodion +
compressed air
A stimulus PW that tends to excite more motor fibers than sensory fibers: - ANS0.5 ms
(50 uS)
According to nursing guidelines, how far do you need to be from the sterile field? -
ANS18"
Advantage of direct CN VIII recordings - ANSdiminishes need for averaging
Advantages of Dural- or Direct-SSEP SC recordings: - ANSWaveforms are higher in
amplitude + require fewer responses
Advantages of general anesthesia during CEA - ANS-prevents pt mvmnt; provides brain
protection & rapid BP control
-does NOT provide measurement of brain activity
After Discharges (AD) - ANS-repetitive electrographic bursts, slowing, and/or spike-
wave activity
-occur in response to electrical stimulation @ brain surface
AICA vasospasm: effects on BAER - ANScomplete loss of all waves EXCEPT cochlear
microphonics
Aliasing - ANS-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: -
ANSmonitoring raw (unaveraged) data
Amplifier input impedance of a differential amplifier must be: - ANSat least 10 MOhms
An EP recording system should allow averaging of: - ANS@ least 4000 trials (sweeps)
Anesthesia is started & pt is intubated. No MEP responses for 15-20 min after induction.
Which muscle relaxant was used? - ANSSuccinylcholine
Anesthesia optimal BIS range - ANS40-50
Anesthetic MEP effects: Propofol, opiodis, TIVA, Ketamine, Halogenated gases, N2O -
ANS-Propofol = efects consistent w/ actions @ level of cortex
-Opioids = minor effects on myogenic MEPs
, -TIVA = most compatible w/ myogenic MEPs (propofol + opioids)
-Ketamine = can enhance SSEPs & MEPs
- Halogenated gases = prominently suppress myogenic MEPs
- N2O = marked Δ's in MEPs; can be recorded using "nitrous-narcotic" technique
Anterior vasculature of the spine s @ greatest risk during: - ANSanterior surgery in the
thoracic spine
Apraxia - ANSDifficulty w/ skilled mvmnts
Area of spine w/ small pedicles, long spinous process, large inter-vertebral foramen -
ANSThoracic
BAER latency abnormalities - vascular causes - ANSvascular malformations in the
posterior fossa (associated w/ hemi-facial spasms & facial paresis)
BAER sound stimulus intensity @ the TM depends on the: - ANSacoustic coupling btwn
the sound stimulus generator and the ear
BAER stim/RR - ANS-<20 Hz (optimal amplitude)
-10-19 Hz range
-31.1 (acceptable)
-NOT divisible by 60 Hz
- >30 Hz = INC lat + DEC amp
BAER troubleshooting: pt w/ conductive hearing loss - ANSINC stim intensity
BAER wave V - latency INC rate from temperature - ANS0.2 ms per 1 deg C
BAER waveforms cannot be recorded in the following conditions: - ANS-bone drilling
-30 dB pe SPL (intensity levels)
-"kinking" of the sound delivery tube
BAER waves III-V are generated at - ANSMidbrain-pons area
III = cochlear nucleus-SOC
IV = SOC-decussation-LL
V = IC
BAERs and SSEPs monitor pathways in _______% of the brainstem area - ANS20%
BAERs: 0.9 ms INC latency of both L & R wave V in a 10 min period most likely
indicates: - ANSTemperature effects (hypothermia)
Barbiturate effect on EEG - ANSburst suppression
with Correct 5-Star Rated Answers.
Graded A+
(+) Babinski Sign could indicate - ANS-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? - ANS100 ms sweep starting 10 ms after the stimulus
(SSEP) If you cannot evaluate motor twitch: - ANSINC intensity until maximum
peripheral signal
(SSEP) In the OR, what is the stim intensity for activating a sensory nerve? - ANSno
established boundary
(SSEP) Initial waveform recorded of a near-field potential - ANSPositive (due to
electrotonic dp of the membrane under the recording electrode)
(SSEP) Pre-stimulus triggering includes: - ANSa period of recording before the stimulus
(SSEP) The electrode closest to the post-central gyrus is: - ANS-trace after phase
reversal occurs
-central sulcus located btwn traces
(SSEP) Which could cause a false negative in a T10 surgery? - ANSAsynchronous MN
stimulation
10 kHz sampling rate: shortest sine wave resolved = - ANS0.2 ms
30-50% DEC in D-wave amplitude, coupled w/ unchanged MEPs, predicts which
neurological outcome? - ANSno changes
60 Hz artifact would most likely be caused by - ANSan infusion pump
A 10-bit A/D converter has how many discrete voltage values in its range? - ANS1024
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? - ANSDownward 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 - ANS20 mV rms @ 60
Hz
,A nml curve of the lumbar spine taking place @ 1-2 y/o - ANSKyphosis
A secure method for applying surface cup electrodes requires: - ANScollodion +
compressed air
A stimulus PW that tends to excite more motor fibers than sensory fibers: - ANS0.5 ms
(50 uS)
According to nursing guidelines, how far do you need to be from the sterile field? -
ANS18"
Advantage of direct CN VIII recordings - ANSdiminishes need for averaging
Advantages of Dural- or Direct-SSEP SC recordings: - ANSWaveforms are higher in
amplitude + require fewer responses
Advantages of general anesthesia during CEA - ANS-prevents pt mvmnt; provides brain
protection & rapid BP control
-does NOT provide measurement of brain activity
After Discharges (AD) - ANS-repetitive electrographic bursts, slowing, and/or spike-
wave activity
-occur in response to electrical stimulation @ brain surface
AICA vasospasm: effects on BAER - ANScomplete loss of all waves EXCEPT cochlear
microphonics
Aliasing - ANS-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: -
ANSmonitoring raw (unaveraged) data
Amplifier input impedance of a differential amplifier must be: - ANSat least 10 MOhms
An EP recording system should allow averaging of: - ANS@ least 4000 trials (sweeps)
Anesthesia is started & pt is intubated. No MEP responses for 15-20 min after induction.
Which muscle relaxant was used? - ANSSuccinylcholine
Anesthesia optimal BIS range - ANS40-50
Anesthetic MEP effects: Propofol, opiodis, TIVA, Ketamine, Halogenated gases, N2O -
ANS-Propofol = efects consistent w/ actions @ level of cortex
-Opioids = minor effects on myogenic MEPs
, -TIVA = most compatible w/ myogenic MEPs (propofol + opioids)
-Ketamine = can enhance SSEPs & MEPs
- Halogenated gases = prominently suppress myogenic MEPs
- N2O = marked Δ's in MEPs; can be recorded using "nitrous-narcotic" technique
Anterior vasculature of the spine s @ greatest risk during: - ANSanterior surgery in the
thoracic spine
Apraxia - ANSDifficulty w/ skilled mvmnts
Area of spine w/ small pedicles, long spinous process, large inter-vertebral foramen -
ANSThoracic
BAER latency abnormalities - vascular causes - ANSvascular malformations in the
posterior fossa (associated w/ hemi-facial spasms & facial paresis)
BAER sound stimulus intensity @ the TM depends on the: - ANSacoustic coupling btwn
the sound stimulus generator and the ear
BAER stim/RR - ANS-<20 Hz (optimal amplitude)
-10-19 Hz range
-31.1 (acceptable)
-NOT divisible by 60 Hz
- >30 Hz = INC lat + DEC amp
BAER troubleshooting: pt w/ conductive hearing loss - ANSINC stim intensity
BAER wave V - latency INC rate from temperature - ANS0.2 ms per 1 deg C
BAER waveforms cannot be recorded in the following conditions: - ANS-bone drilling
-30 dB pe SPL (intensity levels)
-"kinking" of the sound delivery tube
BAER waves III-V are generated at - ANSMidbrain-pons area
III = cochlear nucleus-SOC
IV = SOC-decussation-LL
V = IC
BAERs and SSEPs monitor pathways in _______% of the brainstem area - ANS20%
BAERs: 0.9 ms INC latency of both L & R wave V in a 10 min period most likely
indicates: - ANSTemperature effects (hypothermia)
Barbiturate effect on EEG - ANSburst suppression
