Benign Paroxysmal Positional Vertigo: Is It Really an Otolith Disease?

Area of Science:

• Otolaryngology
• Neurology
• Vestibular System Research

Background:

• The prevailing mechanical theory (cupulolithiasis-canalolithiasis) explains benign paroxysmal positional vertigo (BPPV) via debris in semicircular canals.
• Current BPPV therapies rely on repositioning maneuvers derived from this mechanical theory.
• However, the mechanical theory faces limitations in explaining all clinical presentations of BPPV.

Purpose of the Study:

• To critically review histological and anatomical evidence concerning the mechanical theory of BPPV.
• To question the sole reliance on particle debris in semicircular canals for BPPV physiopathology.
• To explore alternative or contributing factors in the development of BPPV.

Main Methods:

• Literature review focusing on histological and anatomical studies related to BPPV.
• Analysis of existing research on the composition and origin of debris in the semicircular canals.
• Examination of experimental and clinical findings suggesting alternative causes of BPPV.

Main Results:

• The mechanical theory is supported by limited histological data, with anatomical uncertainties.
• Debris in semicircular canals may result from age-related degeneration and not always correlate with BPPV symptoms.
• Some patients exhibit BPPV symptoms without detectable debris, while others with debris remain asymptomatic.

Conclusions:

• The mechanical theory alone is insufficient to fully explain the physiopathology of benign paroxysmal positional vertigo.
• Factors beyond particle debris, such as age-related degeneration and neurotropic viral-induced vestibulopathy, likely contribute to BPPV.
• Further research is needed to elucidate the complex etiology of BPPV.