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[Pupillometry in Menière's disease].
1Instituto di Clinica Otorinolaringoiatrica, Universita di Modena, Italy.
Revue De Laryngologie - Otologie - Rhinologie
|January 1, 1991
Summary
Ménière's disease attacks involve abnormal pupil responses to methacholine, indicating autonomic dysfunction. This cholinergic pupillary hyperreactivity, more pronounced on the affected side during attacks, suggests a central origin, not labyrinthine reflexes.
Area of Science:
- Neurology
- Ophthalmology
- Autonomic Nervous System Research
Context:
- Ménière's disease is hypothesized to involve autonomic dysfunction.
- Previous studies noted anomalous pupillary contraction during Ménière's attacks without cardiovascular involvement.
- A new digital infrared pupillography system was utilized for precise measurements.
Purpose:
- To investigate pupillary response to methacholine in Ménière's disease patients during attack and free stages.
- To compare these responses with other vertiginous disorders and healthy controls.
- To explore the potential central origin of autonomic dysfunction in Ménière's disease.
Summary:
- Pupillary area was measured post-methacholine instillation in 16 Ménière's disease cases, 23 other vertiginous disorder cases, and 10 controls.
- Ménière's disease attacks showed significantly higher and asymmetric pupillary contraction at 30 minutes, indicative of cholinergic hyperreactivity.
- This hyperreactivity, observed during attacks and not solely due to labyrinthine reflexes, supports a central autonomic dysfunction hypothesis.
Impact:
- The findings suggest cholinergic pupillary hyperreactivity is a key characteristic of Ménière's disease crises.
- This autonomic dysfunction appears to be of central origin, differentiating it from labyrinthine-induced responses.
- The study provides objective, quantifiable evidence for autonomic involvement in the pathophysiology of Ménière's disease.