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CNIM Cheat Sheet 2026

The 30 highest-yield CNIM facts, distilled from real exam questions. Print it, save it as a PDF, or study it here โ€” free, no sign-up.

200 questions
240 min time limit
70% to pass
  1. During a spine surgery, what is the purpose of monitoring free-running EMG? โ†’ To detect muscle activity that might indicate nerve root irritation or injury
  2. Which anesthetic agent is most associated with producing epileptiform EEG discharges during induction? โ†’ Etomidate
  3. When monitoring hearing preservation during acoustic neuroma surgery, which BAEP parameter is most predictive of postoperative hearing outcome? โ†’ Wave V latency and amplitude preservation throughout surgery
  4. Which technical factor most commonly causes BAEP artifact that mimics waveform deterioration intraoperatively? โ†’ Stimulus delivery system failure (earphone disconnection or debris)
  5. Which modality is commonly used in NIOM to assess cerebral perfusion during carotid endarterectomy? โ†’ Transcranial Doppler (TCD) ultrasonography
  6. Which surgical procedure most commonly requires intraoperative BAEP monitoring? โ†’ Acoustic neuroma (vestibular schwannoma) resection
  7. Which anesthetic consideration is MOST important for free-running EMG monitoring to be reliable? โ†’ Avoidance of neuromuscular blocking agents after intubation
  8. Free-running (spontaneous) EMG monitoring during spine surgery is used primarily to detect: โ†’ Nerve root irritation or injury from surgical manipulation
  9. What does the P37 component represent in lower extremity SSEP monitoring via posterior tibial nerve stimulation? โ†’ Cortical response at the vertex
  10. The S1 nerve root is best monitored using EMG from which muscle? โ†’ Gastrocnemius and abductor hallucis
  11. Which tcMEP stimulation parameter is most commonly adjusted to optimize responses intraoperatively? โ†’ Stimulus intensity (voltage or current)
  12. What action should be taken if there is a sudden loss of motor evoked potentials (MEPs) during a vascular procedure? โ†’ Immediately notify the surgical team
  13. Which professional society publishes evidence-based guidelines most relevant to IONM practice standards in the United States? โ†’ American Society of Neurophysiological Monitoring (ASNM)
  14. Mean arterial pressure (MAP) below what threshold is considered physiologically significant for intraoperative SSEP monitoring? โ†’ Below 60 mmHg
  15. Relative contraindications to transcranial electrical MEP monitoring include: โ†’ Intracranial metal clips, cochlear implants, or cardiac pacemakers
  16. What does increasing the 'sensitivity' setting on an EEG machine accomplish? โ†’ It enlarges the displayed waveforms by decreasing the ยตV/mm value
  17. Wave V of the BAEP originates from which neural structure? โ†’ Lateral lemniscus and inferior colliculus
  18. Focal EEG slowing isolated to the left temporal region during cerebrovascular surgery MOST likely indicates: โ†’ Regional cerebral dysfunction, such as ischemia or structural compromise
  19. The bite block placed during transcranial MEP monitoring is used to prevent: โ†’ Tongue laceration from jaw muscle MEP contractions
  20. The stimulation rate for median nerve SSEP should avoid multiples of 60 Hz to prevent: โ†’ Electrical line noise contamination
  21. During SSEP monitoring, the N13 potential recorded at the cervical spine represents activity originating from: โ†’ The dorsal horn of the cervical spinal cord
  22. The standard BAEP amplitude alarm criterion during intraoperative monitoring is: โ†’ 50% decrease in Wave V amplitude
  23. Why is the ulnar nerve-innervated abductor digiti minimi (ADM) commonly used as an upper extremity EMG electrode site during cervical spine surgery? โ†’ It monitors C8-T1 nerve root function and is sensitive to ulnar nerve injury
  24. In ethical IONM practice, when an alarm criterion is met, the CNIM practitioner MUST: โ†’ Immediately notify the responsible surgeon and document the communication
  25. A 50% decrease in SSEP amplitude combined with a 10% increase in latency is generally considered: โ†’ A significant alarm criterion requiring intervention
  26. In awake craniotomy EEG monitoring, which pattern would MOST urgently prompt the neurophysiologist to alert the surgical team of impending seizure activity? โ†’ Sudden-onset rhythmic discharges that evolve in frequency and amplitude
  27. What is the primary goal of continuous EEG monitoring during aortic arch surgery? โ†’ To monitor cerebral cortical activity and detect ischemia
  28. At typical surgical maintenance doses of propofol (TIVA), the characteristic EEG pattern is: โ†’ Alpha oscillations and spindle-like beta activity (the 'propofol alpha')
  29. What is the primary neural pathway monitored by upper extremity SSEP during intraoperative monitoring? โ†’ Dorsal column-medial lemniscal pathway
  30. What electrode impedance level is considered acceptable for reliable intraoperative EEG recording? โ†’ Less than 5 kฮฉ
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