Cnim Abret Practice Questions

250 Questions | Total Attempts: 571

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Practice Test Quizzes & Trivia

These questions are based from questions directly from ABRET.


Questions and Answers
  • 1. 
    Which nerve should be stimulated for lower limb SSEP as recommended by ACNS guidelines for short-latency SSEP?
    • A. 

      Posterior tibial nerve

    • B. 

      Peroneal nerve

    • C. 

      Sciatic nerve

    • D. 

      Median nerve

  • 2. 
    Which nerve should be stimulated for upper limb SSEP as recommended by ACNS guidelines for short latency SSEP?
    • A. 

      Median nerve

    • B. 

      Ulnar nerve

    • C. 

      Posterior tibial nerve

    • D. 

      Radial nerve

  • 3. 
    The active electrode is usually placed on the scalp 2cm behind _____ for lower limb SSEP.
    • A. 

      Vertex (Cz)

    • B. 

      Fpz

    • C. 

      C3'

    • D. 

      C4'

  • 4. 
    The warning criteria for SSEP changes have been generally accepted as: Which one do you like?
    • A. 

      50% decrease in amplitude and/or 10% increase in latency

    • B. 

      50% increase in amplitude and/or 10% increase in latency

    • C. 

      10% decrease in amplitude and/or 50% increase in latency

    • D. 

      50% decrease in amplitude and/or 10% decrease in latency

  • 5. 
    Electrode placement on the scalp for SSEP is based on:Which one do you like?
    • A. 

      10-20 system

    • B. 

      Touch and feel

    • C. 

      20-10 system

    • D. 

      10-15 system

  • 6. 
    Central Conduction Time (CCT) for median nerve is calculated between which peaks?
    • A. 

      P14-N20

    • B. 

      N13-N20

    • C. 

      EP-N20

    • D. 

      EP-P14

  • 7. 
    Peripheral Conduction Time (PCT) for median nerve is calculated between which peaks?
    • A. 

      EP-P14

    • B. 

      P14-N20

    • C. 

      N13-N20

    • D. 

      EP-N20

  • 8. 
    Central Conduction Time for posterior tibial nerve is calculated between which peaks?
    • A. 

      LP-P37

    • B. 

      PF-LP

    • C. 

      N34-P37

    • D. 

      P31-P37

  • 9. 
    Peripheral Conduction Time (PCT) for posterior tibial nerve is calculated between which peaks?
    • A. 

      PF-LP

    • B. 

      LP-N37

    • C. 

      P31-P37

    • D. 

      N34-P37

  • 10. 
    SSEP is not recordable when cerebral perfusion drops below:
    • A. 

      15 cc/min / 100 grams of tissue

    • B. 

      20 cc/min / 100 grams of tissue

    • C. 

      15 cc/min / 150 grams of tissue

    • D. 

      25 cc/min / 150 grams of tissue

  • 11. 
    The normal amplitude of SSEP responses recorded from scalp is approximately:
    • A. 

      0.1uV to 10uV

    • B. 

      0.5uV to 10uV

    • C. 

      0.1uV to 20uV

    • D. 

      0.01uV to 10uV

  • 12. 
    If there is a sudden loss in ipsilateral ERB’s point and contralateral N20 response, what is the first step for troubleshooting?
    • A. 

      Check arm positioning

    • B. 

      Check anesthesia

    • C. 

      Check impedance

    • D. 

      Wait for the response to return

  • 13. 
    Latency and/or amplitude changes in SSEP responses can result from:
    • A. 

      Anesthesia/hypothermia

    • B. 

      Technical failure

    • C. 

      Surgical manipulation

    • D. 

      All of the above

  • 14. 
    The N20 responses is generated from which structure?
    • A. 

      The sensory cortex (contralateral to the stimulation side)

    • B. 

      The sensory cortex (ipsilateral to the stimulation side)

    • C. 

      The motor cortex (contralateral to the stimulation side)

    • D. 

      The motor cortex (ipsilateral to the stimulation side)

  • 15. 
    The P14 is generated from which structure?
    • A. 

      Caudal medial lemniscus

    • B. 

      Sensory cortex

    • C. 

      Brainstem

    • D. 

      Brachial plexus

  • 16. 
    The N34 subcortical response is a near field or far field response?
    • A. 

      Near field

    • B. 

      Far field

  • 17. 
    Lumbar Potential (LP) is a stationary (non-propagated) potential.
    • A. 

      True

    • B. 

      False

  • 18. 
    The most reliable criteria for SSEP abnormality is:
    • A. 

      Absence of the obligate waveforms

    • B. 

      Prolongation of the inter-peak latencies

    • C. 

      Both

    • D. 

      Neither

  • 19. 
    The N18 subcortical response is a near field or far field response?
    • A. 

      Far field

    • B. 

      Near field

  • 20. 
    After stimulation of the median nerve at the wrist, the response recorded at the ERB’s point consists of:
    • A. 

      An orthodromic sensory potential

    • B. 

      An antidromic motor action potential

    • C. 

      Both

    • D. 

      Neither

  • 21. 
    Obligatory waves of the posterior tibial nerve (PTN) are:
    • A. 

      PF, LP, P31, N34, & P37

    • B. 

      EP, LP, P31, N34, & P37

    • C. 

      N9, N13, P14, N18, & N20

    • D. 

      EP, N13, P14, N18, & N20

  • 22. 
    Obligatory waves of the median nerve (MN) are:
    • A. 

      N9, N13, P14, N18, & N20

    • B. 

      EP, N13, P14, N18, & N20

    • C. 

      PF, LP, P31, N34, & P37

    • D. 

      EP, LP, P31, N34, & P37

  • 23. 
    What is the location of injury if there is loss of subcortical and cortical SSEP responses but intact ERB’s point response?
    • A. 

      Brainstem / Thalamus

    • B. 

      Brachial Plexus

    • C. 

      Motor Cortex

    • D. 

      Somatosensory Cortex

  • 24. 
    Which of the following sensations are not transferred via dorsal column?
    • A. 

      Proprioception

    • B. 

      Stereognosis

    • C. 

      Temperature

    • D. 

      All of the above

  • 25. 
    What is the blood supply of cortical responses elicited by median nerve stimulation?
    • A. 

      MCA: Middle cerebral artery

    • B. 

      ACA: Anterior cerebral artery

    • C. 

      VBA: Veterbo-Basilar artery

    • D. 

      FA: Femoral artery

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