THIS ARTICLE reviews the contribution of vestibular testing in relation to the diagnosis of acoustic neuromas.
Physiology of Caloric Testing
When the head is tilted back 60°, the horizontal semicircular canal becomes vertical. If water lower than body temperature is introduced into the external auditory canal, it produces convection currents that cause a deflection of the crista ampullaris of the lateral semicircular canal toward the vestibule. A vestibulo-ocular reflex is initiated that causes a deviation of the eyes toward the side of the ear being stimulated. There is a quick reflex return of the eye to the midline designated as the quick component of the nystagmus. According to custom, the quick component is used to describe the direction of the nystagmus.If water warmer than body termperature is introduced into the ear canal, the nystagmoid directions will be opposite and the consequent quick component will be toward the ear under
Linthicum FH, Churchill D. Vestibular Test Results in Acoustic Tumor Cases. Arch Otolaryngol. 1968;88(6):604–607. doi:10.1001/archotol.1968.00770010606007
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