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Computer-quantified positional nystagmus in normals

A C Coats1

  • 1Department of Otorhinolaryngology and Communicative Sciences, Baylor College of Medicine, Houston, TX.

American Journal of Otolaryngology
|September 1, 1993
PubMed
Summary
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A computerized electronystagmography (ENG) analysis system objectively identified spontaneous/positional (S/P) nystagmus in 82.3% of normal subjects. This automated method overcomes manual interpretation subjectivity in ENG testing.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Vestibular System

Background:

  • Electronystagmography (ENG) is used to record nystagmus, an involuntary eye movement.
  • Manual interpretation of ENG records introduces subjectivity, leading to variability in defining "normal" spontaneous/positional (S/P) nystagmus.
  • Discrepancies exist regarding the incidence, intensity, and direction of normal S/P nystagmus.

Purpose of the Study:

  • To develop and validate a computerized ENG analysis system to objectively quantify S/P nystagmus.
  • To eliminate subjectivity in manual interpretation of ENG data.
  • To establish objective criteria for normal S/P nystagmus.

Main Methods:

  • A novel computerized ENG analysis system was developed.
  • The system was validated by comparing its results to those of experienced ENG interpreters.

Related Experiment Videos

  • Clinically normal subjects underwent computerized ENG testing.

    • Main Results:

    • The computerized system detected S/P nystagmus in 82.3% of clinically normal subjects.
    • A statistically significant left-beating directional bias was observed.
    • Nystagmus direction was influenced by head position, with a right-beating tendency in the left lateral position.
    • Upper confidence limits for slow phase velocities were established: -5.5°/sec (left) and +4.4°/sec (right).

    Conclusions:

    • Computerized ENG analysis provides objective and reliable data on S/P nystagmus.
    • Normal S/P nystagmus may be attributed to subclinical pathology, normal vestibulo-ocular reflex asymmetries, or imprinted oculomotor patterns.
    • The findings provide a more precise definition of normal S/P nystagmus parameters.