Light cupula phenomenon: a systematic review

Bal N., Altun M., KURU E., Behmen M. B., Toker O. G.

EGYPTIAN JOURNAL OF OTOLARYNGOLOGY, vol.38, no.1, 2022 (ESCI) identifier identifier

  • Publication Type: Article / Review
  • Volume: 38 Issue: 1
  • Publication Date: 2022
  • Doi Number: 10.1186/s43163-022-00336-5
  • Journal Name: EGYPTIAN JOURNAL OF OTOLARYNGOLOGY
  • Journal Indexes: Emerging Sources Citation Index (ESCI), Scopus
  • Keywords: Light cupula, Null plane, Lateral semicircular canal, Cupulolithiasis, Positional vertigo, CHANGING POSITIONAL NYSTAGMUS, HEMI-LABYRINTHECTOMIZED SUBJECTS, SENSORINEURAL HEARING-LOSS, NEUTRAL POSITION, VERTIGO, CONVERSION, ENDOLYMPH, DIAGNOSIS, PATTERN, HEAVY
  • Marmara University Affiliated: No

Abstract

Geotropic direction-changing positional nystagmus (DCPN) is transient in lateral semicircular canal (LSSK) canalo-lithiasis; it usually cuts off within a minute and fatigues. However, a "light cupula" mechanism has been described for patients with positional vertigo who exhibit a persistent geotropic DCPN without delay or fatigue. When the cupula becomes lighter than the surrounding endolymph, deflection may occur in the cupula under the influence of gravity. The person experiences dizziness and persistent positional nystagmus can be observed while remaining in that position.