Why do rotary tests still have a significance in vestibular diagnostics?
Answer
Rotary tests are a particularly efficient method of investigating vestibular function because:
They constitute a physiological stimulus (acts in pull-push on a pair of canals);
Provide a stimulus closer to natural stimulation frequencies than thermal tests;
Are independent of the anatomical structure of the temporal bone of each individual patient;
Calculate a fundamental parameter: the gain, or the ratio between the eye velocity (output) and the chair/head velocity (input);
They are the ideal tests for assessing the visuo-vestibular interaction;
Allow to evaluate the modulating action of the cerebellum through the step test (abrupt stop) which measures the decay and the maximum velocity of the post-rotatory nystagmus;
Monitor the evolution of compensation for unilateral peripheral vestibular deficits;
In the case of thermal areflexia (very low frequencies) and / or a low gain at V-HIT (high frequencies), they evaluate the functional efficiency of the vestibule at low and medium frequencies.
Enrico received his specialization in Medicine and Surgery from Padua University. He subsequently obtained an ENT specialization and another specialization in Audiology. He has over 25 years of experience working as an ENT specialist focused on surgery, especially in the neck area. His real passion is Otoneurology. For many years he has been interested in the functional evaluation of vertiginous patients. He has presented at various webinar and meetings both nationally and internationally.
He is the author of the book The Video Head Impulse Test – Theoretical and practical aspects and co-author of several journal articles and book chapters in national and international literature. He is engaged in performing diagnostic vestibular testing with all age ranges in various practice environments.
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