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CNIM Practice Exam 1 Questions And Accurate Answers
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CNIM Practice Exam 1 Questions And Accurate AnswersThe patient experiences discomfort at the wrist during a median nerve preoperative
study. Stimulation electrodes are 10 mm gold disk, stimulus intensity is 20 mA and
stimulus duration is 100 μsec. Which of the following would most likely decrease this
patient's discomfort while maintaining adequate stimulation? - ANSWER Decrease
number of repetitions
What is not an advantage of epidural recordings? - ANSWER Absence of significant
artifact
Stimulation rate is determined by the - ANSWER analysis time
Somatosensory evoked potentials are less reliable in patients with ? - ANSWER
Neuromuscular disease
When placing PTN stimulator you should not - ANSWER Secure the tape and bands
around the whole ankle
A differential amplifier with a Gain of 1,000,000 has a 0.2 μV signal at its positive input
and a 0.8 μV signal at its negative input. The output will be: - ANSWER A downward peak
of 0.6V
The lumbar potential is generated from - ANSWER Post-synaptic responses
The P31 response to posterior tibial nerve stimulation - ANSWER Is recordable over a
generalized region of scalp
Which of the following has the greatest effect on SEP monitoring? - ANSWER
Sevoflurane
,A shocking sensation that occurs throughout the body during neck flexion is called -
ANSWER L'Hermittes sign
Lowering the SSEP hicut filter from 500 Hz to 200 Hz may cause the cortical peaks to: -
ANSWER Appear longer in latency
How many waves of a 60 Hz signal should you see in a 250 mS sweep? - ANSWER 15
The activation of an action potential of a neuron will depend on: - ANSWER Its
membrane potential based on the spatiotemporal summation of its excitatory and
inhibitory inputs
From left to right pre-auricular points is measured 30 cm. The C3 electrode is located: -
ANSWER 9 cm medial to the left pre-auricular point
The most common source of patient infection in the operating room is from: - ANSWER
The patient's own endogenous flora
What is the maximal time in which to expect EEG changes following cross clamping of
the carotid? - ANSWER Two minutes
Cranial nerve IV can be monitored using electrodes inserted into the - ANSWER
Superior oblique
According to the nurses guidelines how far do you need to be from the sterile field? -
ANSWER 18 inches
When no phase reversal is present in an anterior-posterior cortical grid recording: -
ANSWER The maximum amplitude response is closest to the central sulcus
, EEG will most likely disappear at what body temperature - ANSWER 16 degrees C
Epileptiform discharges can be localized by: - ANSWER A phase reversal between two
channels
Why is platinum used in epidural recordings - ANSWER Other metals become toxic when
current is applied to them due to the ionic
What will most likely effect SSEPs? - ANSWER Spinal cord tumor
Excessive cerumen may cause - ANSWER Absence of the BAER
Which of the following can increase SEP amplitude? - ANSWER Etomidate
If there is to be a change in the Cz'-Fz cortical response to PTN stimulation, what
montage would you use to confirm this? ANSWER Cpc-Cpi
CNS depressants cause: ANSWER Minimal effects in ABRs
After-discharges occur after what? ANSWER Direct cortical stimulation
In an ABR, there is a normal wave one with then delayed wave I-V on one side. What
surgery is this most consistent with? ANSWER CPA Tumor
An optimal repetition rate for BAEP's is - ANSWER 31Hz
The input impedance of a differential amplifier should be: - ANSWER At least 100
Megaohms
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