Otolith Membrane Herniation, not Semicircular Canal Duct Dilation, Is Associated with Decreased Caloric Responses in Ménière’s Disease

Leo L. Shen, Nicholas S. Andresen, Divya A. Chari, Jacob M. Pogson, Amanda M. Lauer, Richard D. Rabbitt, John P. Carey, Felipe Santos, Bryan K. Ward

Research output: Contribution to journalArticlepeer-review

Abstract

Ménière’s disease (MD) is a debilitating disorder with unclear pathophysiology whose diagnosis often relies on clinical judgment rather than objective testing. To complicate matters further, a dissociation has emerged between two vestibular function tests commonly used in patients with MD to examine the same end-organ (the semicircular canals): the caloric test and video head impulse testing (vHIT). Caloric responses are often abnormal, while vHIT results remain normal. Explaining this dissociation could reveal novel insights into MD pathophysiology. Here, we conduct a histopathological study using temporal bone specimens (N = 58, 21 MD-affected ears and 37 age-matched controls) and their clinical testing data to examine current hypotheses aimed at this dissociation. We find otolith membrane herniation into the horizontal semicircular canal in 69% of MD ears, with 90% of these ears demonstrating a diminished caloric response. No ears with a normal response had this herniation. Moreover, we evaluated the semicircular canals for endolymphatic hydrops, which had been hypothesized to contribute to the dissociation, and found no evidence of duct dilation/hydrops. We did, however, note a potentially novel morphologic finding—smaller bony labyrinth cross-sectional diameters/areas in some MD ear canals compared to controls, suggesting relative size of the membranous duct to the bony canal rather than absolute size may be of importance. Taken together, this study refines hypotheses on the vestibular test dissociation in MD, holding diagnostic implications and expanding our understanding of the mechanisms underlying this enigmatic disease.

Original languageEnglish (US)
Pages (from-to)95-106
Number of pages12
JournalJARO - Journal of the Association for Research in Otolaryngology
Volume24
Issue number1
DOIs
StatePublished - Feb 2023

Keywords

  • Caloric
  • Herniation
  • Ménière
  • Ménière’s disease
  • Otolith
  • Semicircular canal

ASJC Scopus subject areas

  • Sensory Systems
  • Otorhinolaryngology

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