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Oculomotor evaluation in patients with peripheral vestibular dysfunction.

Vanessa Costa Tuma¹, Cristina Freitas Ganança, Maurício Malavasi Ganança

¹Sao Paulo Federal University, Paulista School of Medicine, Brazil.

Brazilian Journal of Otorhinolaryngology

|November 23, 2006

Summary

Digital vectonystagmography reveals abnormalities in saccadic eye movements, pendular tracking, and optokinetic nystagmus in patients with peripheral vestibular dysfunction.

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Area of Science:

Neurology
Ophthalmology
Vestibular System

Background:

Peripheral vestibular dysfunction can manifest with diverse symptoms, including dizziness.
Accurate diagnosis relies on objective measures of ocular motor function.
Digital vectonystagmography (VNG) is a key diagnostic tool for evaluating vestibular and ocular motor disorders.

Purpose of the Study:

To determine if specific parameters of ocular movements measured by digital VNG are abnormal in patients suspected of having peripheral vestibular dysfunction.
To identify which VNG parameters are most sensitive to peripheral vestibular dysfunction.

Main Methods:

Sixty patients (age 12-82) with suspected peripheral vestibular dysfunction were evaluated using digital VNG.
Parameters assessed included fixed and randomized saccadic movements, pendular tracking, and optokinetic nystagmus.
Ocular movement findings were compared against established normal reference values.

Main Results:

100% of patients showed altered latency in fixed saccadic movements; 35% had altered speed.
Randomized saccadic movements exhibited altered latency (100%), precision (78.3%), and speed (1.7%).
Pendular tracking gain was altered in 13.3%-21.7% of cases across different frequencies, and optokinetic nystagmus showed alterations in 1.7%-5.0%.

Conclusions:

Digital VNG parameters, including saccadic eye movements, pendular tracking, and optokinetic nystagmus, frequently demonstrate abnormalities in patients with peripheral vestibular dysfunction.
These findings highlight the utility of digital VNG in diagnosing peripheral vestibular disorders.
Specific alterations in saccadic latency and precision, pendular tracking gain, and optokinetic nystagmus are indicative of vestibular impairment.