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Evoked Potentials Flashcards

7 cards from real EEG practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Evoked Potentials flashcards as text

  1. Which VEP component is most commonly used clinically to detect demyelinating disease of the optic nerve?

    Answer: P100

    The P100 component of the VEP is the most clinically relevant peak; a delayed latency (>115 ms) strongly suggests optic nerve demyelination.

  2. In brainstem auditory evoked potentials (BAEPs), Wave V originates primarily from which structure?

    Answer: Lateral lemniscus/inferior colliculus

    Wave V of the BAEP is generated by the lateral lemniscus and inferior colliculus region of the upper brainstem.

  3. What does a prolonged I–III interpeak interval in BAEPs indicate?

    Answer: Pontine lesion between cochlear nucleus and superior olive

    The I–III interpeak interval reflects conduction time through the lower brainstem (caudal pons), so prolongation indicates a lesion in that segment.

  4. During intraoperative monitoring with somatosensory evoked potentials, which change should prompt immediate surgical notification?

    Answer: 50% amplitude decrease or 10% latency increase

    The universally accepted alarm criterion for intraoperative SSEP is a ≥50% amplitude decrease or ≥10% latency increase from baseline.

  5. Pattern-reversal VEPs are preferred over flash VEPs in clinical practice primarily because they:

    Answer: Produce more consistent waveforms with smaller normal variance

    Pattern-reversal stimuli generate highly reproducible P100 components with tight normative ranges, making subtle latency delays more detectable than with flash VEPs.

  6. Which evoked potential modality is most useful for monitoring spinal cord function during scoliosis correction surgery?

    Answer: Somatosensory evoked potentials

    SSEPs monitor the dorsal column sensory pathways of the spinal cord, making them the primary tool for detecting cord compromise during spinal instrumentation.

  7. In a patient with absent BAEPs bilaterally, which condition is LEAST likely to be the cause?

    Answer: Cortical stroke sparing the brainstem

    BAEPs reflect subcortical (brainstem) generators; a cortical stroke that spares the brainstem would preserve all BAEP waves.