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Related Experiment Video

Updated: Apr 5, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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Conversion between geotropic and apogeotropic persistent direction-changing positional nystagmus.

Jung Eun Shin1, Kyung-Hwa Jeong1, Sung Hwan Ahn1

  • 1a Department of Otorhinolaryngology-Head and Neck Surgery, Konkuk University Medical Center, Konkuk University School of Medicine , Seoul, Republic of Korea.

Acta Oto-Laryngologica
|August 7, 2015
PubMed
Summary
This summary is machine-generated.

Persistent direction-changing positional nystagmus (DCPN) conversion differs between sudden sensorineural hearing loss (SSNHL) and cupulopathy. These findings suggest distinct pathophysiologies and mechanisms for nystagmus direction changes in these conditions.

Keywords:
Direction-changing positional nystagmushead-roll testheavy cupulalight cupulapositional vertigosudden sensorineural hearing loss

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Area of Science:

  • Neurology
  • Ophthalmology
  • Vestibular Science

Background:

  • Persistent direction-changing positional nystagmus (DCPN) is a challenging condition.
  • Understanding its conversion between geotropic and apogeotropic forms is crucial for diagnosis and management.

Observation:

  • This study examined 10 patients with persistent DCPN showing nystagmus direction conversion.
  • Patients were assessed using video-oculography during serial head-roll tests.

Findings:

  • Five patients had sudden sensorineural hearing loss (SSNHL), and five had cupulopathy.
  • In SSNHL, nystagmus conversion occurred between 4-23 days post-vertigo onset.
  • In cupulopathy, conversion was earlier (1-2 days) and followed a consistent pattern (apogeotropic to geotropic).
  • The null plane's location varied in SSNHL but was consistent in cupulopathy.

Implications:

  • Clinical features and timing of nystagmus conversion differ significantly between SSNHL and cupulopathy.
  • These differences suggest distinct underlying pathophysiological mechanisms for persistent DCPN in each group.
  • Further research into these mechanisms can refine diagnostic and therapeutic strategies for vestibular disorders.