CNIM EXAM QUESTIONS WITH CORRECT VERIFIED
ANSWERS LATEST RATED A+
What intravenous drug is used to maintain hypotension? - ANSWER - Nutroprusside
At the stage of surgical anesthesia, propofol affects the BAEP by - ANSWER - increasing the
latencies of waves I, III, and V without changing their amplitudes
If you have a signal to noise ratio of 1:2, averaging 64 responses will: - ANSWER - improve the
ratio to 4:1
A major advantage of digital filters over analog filters is: - ANSWER - They impose no phase
effects on the recorded signal
Which of electrode is regarded as an effective stimulator during facial nerve recordings: -
ANSWER - Bipolar concentric EMG needle
Which time constant of a locut filter would be most effective for cutting out low frequency noise
from your signal? - ANSWER - 10 ms
The input impedance of a differential amplifier should be: - ANSWER - At least 100,000,000
ohms
What will be the frequency of a signal if in a 30 msec sweep the interval between each cycle of
the signal is 0.03 msec? - ANSWER - 33 KHz
What is the initial event that occurs when the action potential threshold of a neuron is reached? -
ANSWER - Voltage-gated Sodium channels open
The central conduction time for MN SSEP is: - ANSWER - P14 - N20
,Spinal cord ischemia during aortic surgery is best detected by changes in the - ANSWER -
posterior tibial nerve somatosensory evoked potential
At the end of an acoustic neuroma surgery, you would test the facial nerve by stimulating: -
ANSWER - Proximal to the site of the tumor
In the operating room, the stimulus intensity for activating a sensory nerve: - ANSWER - does
not have an established boundary
The effects of pharmacological or surgical manipulations can be mimicked by the inappropriate
manipulation of: - ANSWER - filter settings
Eliciting a motor twitch with PTN stimulation, you expect to see: - ANSWER - Plantar flexion of
the toes
What would be the effect of fluid in the external auditory canal? - ANSWER - Increase of
absolute latencies
Early changes to CMAPs, during the exposure of CN VII, are most likely due to - ANSWER -
heating from the electrical cautery device
During microvascular decompression surgery to relieve a hemifacial spasm - ANSWER - a
stimulation of CN VII elicits a response from the mentalis muscle
Of the following, the peak equivalent SPL of a click should be calibrated at: - ANSWER - 1000
Hz
An unstable blood pressure during SSEP monitoring in the OR affects cortical EPs resulting in -
ANSWER - fluctuating amplitudes
, Multiple sclerosis, spinal cord injury, and brain trauma can lead to debilitating spasticity that has
been relieved in some patients following: - ANSWER - selective dorsal rhizotomy
If a 10 microvolt signal inside 50 microvolts of noise is averaged for 100 traces, the final signal to
noise ratio will be: - ANSWER - 2:1
A patient in a state of surgical anesthesia using nitrous oxide is likely to have a drop in SSEP
amplitudes of - ANSWER - 0.75
What is the minimum bandpass filter for an evoked potential system? - ANSWER - 0.1-5000 Hz
A patient is admitted to the operating room diagnosed with a burst fracture of the first lumbar
vertebra. The most appropriate nerve(s) to monitor would be the: - ANSWER - posterior tibial
and ulnar nerves
If a sound intensity is decreased from 80 dB to 60 dB then the sound pressure has been decreased
by a factor of: - ANSWER - 10
The term "broadband click" refers to a - ANSWER - peak acoustic power of 2 - 4 kHz
What is a rhizotomy? - ANSWER - A procedure to selectively destroy problematic nerve roots
If you receive a shock from the system console, the first thing you should do is: - ANSWER -
Disconnect the patient
What is the best montage to use to evaluate dorsal column activity? - ANSWER - Cs5-EPc
The earliest obligate component of the median nerve SSEP that is measured far-field is generated
in the:- ANSWER - Medial lemniscus
ANSWERS LATEST RATED A+
What intravenous drug is used to maintain hypotension? - ANSWER - Nutroprusside
At the stage of surgical anesthesia, propofol affects the BAEP by - ANSWER - increasing the
latencies of waves I, III, and V without changing their amplitudes
If you have a signal to noise ratio of 1:2, averaging 64 responses will: - ANSWER - improve the
ratio to 4:1
A major advantage of digital filters over analog filters is: - ANSWER - They impose no phase
effects on the recorded signal
Which of electrode is regarded as an effective stimulator during facial nerve recordings: -
ANSWER - Bipolar concentric EMG needle
Which time constant of a locut filter would be most effective for cutting out low frequency noise
from your signal? - ANSWER - 10 ms
The input impedance of a differential amplifier should be: - ANSWER - At least 100,000,000
ohms
What will be the frequency of a signal if in a 30 msec sweep the interval between each cycle of
the signal is 0.03 msec? - ANSWER - 33 KHz
What is the initial event that occurs when the action potential threshold of a neuron is reached? -
ANSWER - Voltage-gated Sodium channels open
The central conduction time for MN SSEP is: - ANSWER - P14 - N20
,Spinal cord ischemia during aortic surgery is best detected by changes in the - ANSWER -
posterior tibial nerve somatosensory evoked potential
At the end of an acoustic neuroma surgery, you would test the facial nerve by stimulating: -
ANSWER - Proximal to the site of the tumor
In the operating room, the stimulus intensity for activating a sensory nerve: - ANSWER - does
not have an established boundary
The effects of pharmacological or surgical manipulations can be mimicked by the inappropriate
manipulation of: - ANSWER - filter settings
Eliciting a motor twitch with PTN stimulation, you expect to see: - ANSWER - Plantar flexion of
the toes
What would be the effect of fluid in the external auditory canal? - ANSWER - Increase of
absolute latencies
Early changes to CMAPs, during the exposure of CN VII, are most likely due to - ANSWER -
heating from the electrical cautery device
During microvascular decompression surgery to relieve a hemifacial spasm - ANSWER - a
stimulation of CN VII elicits a response from the mentalis muscle
Of the following, the peak equivalent SPL of a click should be calibrated at: - ANSWER - 1000
Hz
An unstable blood pressure during SSEP monitoring in the OR affects cortical EPs resulting in -
ANSWER - fluctuating amplitudes
, Multiple sclerosis, spinal cord injury, and brain trauma can lead to debilitating spasticity that has
been relieved in some patients following: - ANSWER - selective dorsal rhizotomy
If a 10 microvolt signal inside 50 microvolts of noise is averaged for 100 traces, the final signal to
noise ratio will be: - ANSWER - 2:1
A patient in a state of surgical anesthesia using nitrous oxide is likely to have a drop in SSEP
amplitudes of - ANSWER - 0.75
What is the minimum bandpass filter for an evoked potential system? - ANSWER - 0.1-5000 Hz
A patient is admitted to the operating room diagnosed with a burst fracture of the first lumbar
vertebra. The most appropriate nerve(s) to monitor would be the: - ANSWER - posterior tibial
and ulnar nerves
If a sound intensity is decreased from 80 dB to 60 dB then the sound pressure has been decreased
by a factor of: - ANSWER - 10
The term "broadband click" refers to a - ANSWER - peak acoustic power of 2 - 4 kHz
What is a rhizotomy? - ANSWER - A procedure to selectively destroy problematic nerve roots
If you receive a shock from the system console, the first thing you should do is: - ANSWER -
Disconnect the patient
What is the best montage to use to evaluate dorsal column activity? - ANSWER - Cs5-EPc
The earliest obligate component of the median nerve SSEP that is measured far-field is generated
in the:- ANSWER - Medial lemniscus
