CNIM Practice Questions – Comprehensive
Exam Preparation
ANASTAMOSIS? - ANSWER ✔ -CONNECTION or opening BETWEEN two things (especially cavities or
passages) that are normally diverging or branching, such as between blood vessels.
-COMMUNICATION BETWEEN ARTERIES
What causes the most airborne bacteria in OR?
a. blood on gown
b. blood spill
c. skin shed
d. patient vent - ANSWER ✔ c. skin shed
Nerve that innervates 4th and 5th fingers? - ANSWER ✔ Ulnar Nerve
Problem with Bilateral Synchronus Stim? - ANSWER ✔ Can mask unilateral problems
No N20 at baseline could mean? - ANSWER ✔ Stroke
What should you check 1st if you lose all waves? - ANSWER ✔ Stimulator
Which of the following devices measures electrode resistance?
1. Ammeter
2. Ohmmeter
3. Voltmeter
4. Photometer - ANSWER ✔ 2. Ohmmeter
If an evoked potential has a voltage of 10uV and the associated noise has a voltage of 50uV, what is the
signal to noise ratio after 100 averaged responses?
,CNIM Practice Questions – Comprehensive
Exam Preparation
1. 1:1
2. 1:2
3. 2:1
4. 5:1 - ANSWER ✔ 3. 2:1
To display median nerve SSEP response as an upward deflection, which of the following must be known?
1. Waveform polarity and latency of the response
2. Waveform polarity and polarity convention of the amplifier inputs
3. Polarity convention of amplifier inputs and amplitude of the response
4. Latency of the response and polarity convention of the amplifier inputs - ANSWER ✔ 2. Waveform
polarity and polarity convention of the amplifier inputs
If an amplifier is rated as having 120 dB common mode rejection rate, which of the following ratios of in-
phase to out-of-phase signals would be expected?
1. 10,000:1
2. 100,000:1
3. 500,000:1
4. 1,000,000:1 - ANSWER ✔ 4. 1,000,000:1
Which of the following cranial nerves innervates the extraocular muscles?
1. Optic
2. Facial
3. Abducens
4. Trigeminal - ANSWER ✔ 3. Abducens
,CNIM Practice Questions – Comprehensive
Exam Preparation
Which of the following is an example of a SSEP far-field subcortical potential?
1. N20
2. N34
3. Erbs point
4. Popliteal Fossa - ANSWER ✔ 2. N34
Which of the following opposes any change in current?
1. Capacitance
2. Impedance
3. Inductance
4. Resistance - ANSWER ✔ 3. Inductance
Which of the following electrode materials has little electrode potential drift and a long time constant?
1. Tin
2. Gold
3. Silver
4. Stainless Steel - ANSWER ✔ 2. Gold
Where should epidural electrodes be placed?
1. On the dura
2. In the spinal cord
3. Within the dural membrane
, CNIM Practice Questions – Comprehensive
Exam Preparation
4. Between the dura and the spinal cord - ANSWER ✔ 1. on the dura
With referential recording, maximal amplitude cortical evoked potentials following stimulation of the
left posterior tibial nerve usually would be found between?
1. C3 and CZ
2. C4 and P4
3. FZ and CZ
4. C4 and CZ - ANSWER ✔ 1. C3 and CZ
For preoperative posterior tibial somatosensory evoked potentials, which of the following would be the
best ipsilateral location for the ground electrode?
1. Forearm
2. Calf
3. Shoulder
4. Palm - ANSWER ✔ 2. Calf
To record the afferent volley after posterior tibial nerve stimulation, an electrode should be placed on
the?
1. Mastoid
2. Erbs point
3. T5 spine
4. Index Finger - ANSWER ✔ 3. T5 spine
Impedances of applied electrodes should be?
Exam Preparation
ANASTAMOSIS? - ANSWER ✔ -CONNECTION or opening BETWEEN two things (especially cavities or
passages) that are normally diverging or branching, such as between blood vessels.
-COMMUNICATION BETWEEN ARTERIES
What causes the most airborne bacteria in OR?
a. blood on gown
b. blood spill
c. skin shed
d. patient vent - ANSWER ✔ c. skin shed
Nerve that innervates 4th and 5th fingers? - ANSWER ✔ Ulnar Nerve
Problem with Bilateral Synchronus Stim? - ANSWER ✔ Can mask unilateral problems
No N20 at baseline could mean? - ANSWER ✔ Stroke
What should you check 1st if you lose all waves? - ANSWER ✔ Stimulator
Which of the following devices measures electrode resistance?
1. Ammeter
2. Ohmmeter
3. Voltmeter
4. Photometer - ANSWER ✔ 2. Ohmmeter
If an evoked potential has a voltage of 10uV and the associated noise has a voltage of 50uV, what is the
signal to noise ratio after 100 averaged responses?
,CNIM Practice Questions – Comprehensive
Exam Preparation
1. 1:1
2. 1:2
3. 2:1
4. 5:1 - ANSWER ✔ 3. 2:1
To display median nerve SSEP response as an upward deflection, which of the following must be known?
1. Waveform polarity and latency of the response
2. Waveform polarity and polarity convention of the amplifier inputs
3. Polarity convention of amplifier inputs and amplitude of the response
4. Latency of the response and polarity convention of the amplifier inputs - ANSWER ✔ 2. Waveform
polarity and polarity convention of the amplifier inputs
If an amplifier is rated as having 120 dB common mode rejection rate, which of the following ratios of in-
phase to out-of-phase signals would be expected?
1. 10,000:1
2. 100,000:1
3. 500,000:1
4. 1,000,000:1 - ANSWER ✔ 4. 1,000,000:1
Which of the following cranial nerves innervates the extraocular muscles?
1. Optic
2. Facial
3. Abducens
4. Trigeminal - ANSWER ✔ 3. Abducens
,CNIM Practice Questions – Comprehensive
Exam Preparation
Which of the following is an example of a SSEP far-field subcortical potential?
1. N20
2. N34
3. Erbs point
4. Popliteal Fossa - ANSWER ✔ 2. N34
Which of the following opposes any change in current?
1. Capacitance
2. Impedance
3. Inductance
4. Resistance - ANSWER ✔ 3. Inductance
Which of the following electrode materials has little electrode potential drift and a long time constant?
1. Tin
2. Gold
3. Silver
4. Stainless Steel - ANSWER ✔ 2. Gold
Where should epidural electrodes be placed?
1. On the dura
2. In the spinal cord
3. Within the dural membrane
, CNIM Practice Questions – Comprehensive
Exam Preparation
4. Between the dura and the spinal cord - ANSWER ✔ 1. on the dura
With referential recording, maximal amplitude cortical evoked potentials following stimulation of the
left posterior tibial nerve usually would be found between?
1. C3 and CZ
2. C4 and P4
3. FZ and CZ
4. C4 and CZ - ANSWER ✔ 1. C3 and CZ
For preoperative posterior tibial somatosensory evoked potentials, which of the following would be the
best ipsilateral location for the ground electrode?
1. Forearm
2. Calf
3. Shoulder
4. Palm - ANSWER ✔ 2. Calf
To record the afferent volley after posterior tibial nerve stimulation, an electrode should be placed on
the?
1. Mastoid
2. Erbs point
3. T5 spine
4. Index Finger - ANSWER ✔ 3. T5 spine
Impedances of applied electrodes should be?
