The Practice Exam

Test. Answers. Explanations.

Example Questions for the CNIM and DABNM Exam

I’ve pulled some of the questions out of my CNIM and DABNM study guides for you to go through. After you complete this little exam, I’ll give you the right answers and explanations.

These questions came straight out of 1 section of my study guides (the Q and A portion). I know people love to take practice exams, but probably gain very little if there isn’t some explanation that goes along with the Q and A. Learning and understanding the concepts is what makes for a great IONM clinician.

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What is the class, the speed and the name of the receptors when we stimulate light touch receptors?

A-alpha cutaneous and Alpha motor neurons, 20-50m/s, Pacinian corpuscle or touch receptors

A-alpha cutaneous and Alpha motor neurons, 70-120m/s, Pacinian corpuscle or touch receptors

A-delta cutaneous, 70-120m/s, Pacinian corpuscle or touch receptors

A-alpha cutaneous and Alpha motor neurons, 70-120m/s, Meissner corpuscle

The chemical transmitter that mediates between sympathetic preganglionic fibers and the end organ is:

norepinephrine

acetylcholine

adrenaline

epinephrine

There is a greater amount of somatotopical representation in the motor cortex for the:

arm

leg

finger

erector spinae

Which of the following is most closely associated with language comprehension?

agnosia

Broca's area

Wernicke's area

arcuate fasciculus

D-wave amplitudes are representative of what?

The relative amount of functioning fast-conducting fibers of the CST

Functional integrity of the spinal cord's gray matter

Functional integrity of the cord's lateral distribution of tracts, namely the spinocerebellar tract

Same information as motor evoked potentials

Why would you want to include the bulbocavernouse reflex in your multi-modality monitoring of lumbar cases with cauda equina syndrome?

This oligosynaptic reflex allows us to assess the functional integrity of both the afferent and efferent fibers of the pudendal nerve along with the reflex center located in the gray matter at S2-4.

Large space occupying lesions, causing cauda equina syndrome, can ablate the pudendal nerves.

You wouldn't, seeing as the cauda equina only serves to attach the spinal cord to the first segment of coccyx.

You wouldn't, seeing as the bulbocavernouse reflex only assesses the sensory portion, making it redundant with SSEPs.

What is the typical threshold for the recurrent laryngeal nerve on stimulation, and what is the typical max response stimulated at?

1.0mA, 3.0mA

0.05mA, 0.1mA

6mA, 10mA

0.4mA, 0.8mA

What is the frequency of EMG activity that is a cause for concern?

<20 Hz

>20 Hz

>60 Hz

>120 Hz

What does cerebral oximetry measure?

oxygenation of venous blood in the brain.

oxygenation of arterial blood in the brain

blood flow velocity

blood flow volume

In BAERs, conductive losses affect all the following except:

amplitudes

interpeak latencies

amplitudes and interpeak latencies

none of the above.

What are significant changes in VEP?

all-or-none amplitude loss

50% change in amplitude

latency shift of 40-50 msec

both 50% reduction in amplitude and latency shift of 40-50 msec

What is a sampling rate?

the number of samples contained in a 1 second of data and indicates how often the samples are collected.

the process of converting the amplitude of an analog signal into a series of numbers, known as samples.

repeated presentation of a stimulus, recording an addition of each response to the preceding ones, divide the sum by the total number of responses.

a factor equal to the square root of the number of trials used to average.

How do you find the common mode rejection ratio?

= (differential gain) / (common mode gain)

= (common mode gain) X (differential gain)

= (common mode gain) / (differential gain)

= (differential gain) + (common mode gain)

What is Coulomb’s Law?

opposites attract and same repels.

it has to do with the polarity of the nucleus of a cell and the orbiting electrons that revolve around it in the atom. The further away the electron ring from the nucleus, the weaker the bond.

both are true

both are false

What impedance rate demonstrates good electrode placement?

<1 Ohms

<1 Kilohm

<5 Ohms

<5 Kilohms

What is the most common cause of 60 cycle noise?

bair huggers

unequal electrode impedance

power outlet in the UK

surgical table

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The Practice Exam

Example Questions for the CNIM and DABNM Exam

Start The IONM Practice Exam Here

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