3D analysis of nystagmus during peripheral vertiginous attacks

Area of Science:

• Neurology
• Ophthalmology
• Otolaryngology

Background:

• Peripheral vertigo presents diagnostic challenges in localizing the lesion site.
• Nystagmus, an involuntary eye movement, is a key indicator of vestibular system dysfunction.

Purpose of the Study:

• To localize the site of lesion in peripheral vertigo by analyzing nystagmus characteristics.
• To differentiate between Menière's disease (MD), vestibular neuritis (VN), and Hunt's syndrome (HS) based on nystagmus patterns.

Main Methods:

• 3D analysis of nystagmus during peripheral vertiginous attacks.
• Comparison of horizontal, vertical, and torsional nystagmus components and their slow-phase velocities.
• Correlation of nystagmus characteristics with specific peripheral vertigo diagnoses.

Main Results:

• The horizontal nystagmus component showed the largest ratio across all analyzed diseases.
• Spontaneous nystagmus direction varied: toward the affected side in 3 cases and the opposite side in 15.
• Menière's disease patients exhibited similar horizontal and torsional components with equal slow-phase velocities.
• Vestibular neuritis and Hunt's syndrome patients displayed nystagmus directed to the opposite side.
• Vestibular neuritis patients uniquely showed an upward nystagmus component alongside horizontal and torsional components.

Conclusions:

• Nystagmus analysis provides valuable insights into the localization of peripheral vertigo lesions.
• Menière's disease is associated with pathological changes throughout the entire inner ear.
• Vestibular neuritis likely involves lesions in the horizontal and anterior semicircular canals or the superior vestibular nerve.