2024 ABRET Practice Test New Full Test | Questions and Answers ( Included ) 100% Correct
- in which type of evoked potentials is the scalp position of recording electrodes
most critical?
Answer: lower extremity SSEPs
- if an evoked potential has a voltage of 10 uV and the associated noise has a
voltage of 50 uV, what is the signal to noise ratio after 100 averaged responses?Answer: 2:1
- to display median nerve SSEP responses as an upward deflection, which of the
following must be known?
Answer: waveform polarity and polarity convention of the amplifier inputs
- if an amplifier is rated as having 120 dB common mode rejection ratio, which of
the following ratios in phase to out of phase signals would be expected?Answer: 1,000,000:1
- which of the following cranial nerves innervates an extraocular muscles
Answer: - abducens
- Which of the following is an example of an SSEP far-field subcortical poten tial?
Answer: N34
- what is the segmental motor innervation of the peroneus longus?
Answer: L4, L5, S1
- which of the following opposes any change in current
Answer: inductance
- the dorsal column pathyways synapse at which loci on their way to the sensory
cortex
Answer: nucleus cuneatus and thalamus
- with referential recording, maximal amplitude cortical evoked potentials
following stimulation of the left posterior tibial nerve usually would be found between
Answer: C3 and CZ
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- which area of the spinal cord is most likely to have the poorest blood supply
Answer: thoracic
12. the posterior longitudinal ligament lies within the vertebral canal:
Answer: in front of the vertebral body
- which of the following would result in the best resolution in the ana-
log-to-digital conversion process?
Answer: the maximal peak-to-peak signal amplitude should match the converter
range
- an increase in stimulation intensity causes a linear increase in which of the
following SSEP components
Answer: P31
- epidural electrodes are made of platinum because
Answer: other metals may be- come toxic when currents are applied
- during a median nerve preoperative study, a patient has discomfort at the wrist.
stimulation electrodes are 10mm gold disk, stimulus intensity is 20 mA, and stimulus duration is 100 msec. which of the following would most likely reduce the patient's discomfort while maintaining adequate stimulation?
Answer: de- crease number of repetitions or use a larger stimulating electrode
- what improves the signal-to-noise ratio by the square root of the number of
responses added?
Answer: signal averaging
- in BAEPs, wave I can most easily be differentiated from cochlear micro-
phonics based upon
Answer: click polarity
- what is the interstimulus of a 50 Hz click stimulus
Answer: 20 msec
- SSEPs recorded from the scalp after electrical stimulation of the peripheral nerve
are conducted through the
Answer: dorsal column on the side of stimulation
- monitoring the posterior tibial nerve SSEPs is most appropriate in cere-
brovascular procedures involving which of the following arteries?
Answer: anterior cerebral 2 / 3
- identification of wave V of the BAEP may require
Answer: decreasing stimulus inten sity
- in spinal surgery, the primary purpose of the popliteal fossa recording electrode
is to
Answer: verify adequacy of stimulus
- while performing a posterior tibial SSEP, hypothermia of the lower extremities is
most likely to cause
Answer: slowed peripheral conduction velocity
- which peak in tibial nerve SSEPS is most analogous to P14 of median nerve SSEP
Answer: P31
- during posterior fossa surgery, when BAEPs are used for monitoring brain- stem
function, it is most important to
Answer: stimulate and record from the contralateral side
- which cranial nerve is most appropriate to monitor during resection of a 4cm
vestibular schwannoma
Answer: facial
- during carotid endarterectomy, what ssep modality is recommended for
monitoring cerebral function
Answer: median nerve
- if the EEG is preserved during carotid endarterectomy surgery, it indicates-
Answer: adequate cortical perfusion and oxengenation
- alternating current is used when checking electrode impedance to
Answer: avoid electrode polarization
- which of the following is most likely to cause 60 Hz contamination of evoked
potential waveforms in the operating room?
Answer: fluorescent lights
- a postincision baseline recording is used to
Answer: establish a standard for the patient
- which of the following would most likely be normal int he pre-operative
baseline upper extremity SSEP of a patient with a lesion in the dorsal column?
Answer: ERB's point potential
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