Clinical significance of vertical component of caloric response including its second phase in vertiginous patients

Abstract

We recorded the vertical component in 103/200 ears in the caloric first phase, which was directed mostly upward (92/103 ears). We also recorded the vertical component in 91/200 ears in the provoked second phase, which was directed almost exclusively downward (90/91 ears).

A head-tilt caloric test for evaluating the vertical semicircular canal function

“…As previously reported [3], we detected no vertical component in caloric response in 50%, a small up-beating component in 45%, and a small down-beating component in 5% of 200 ears. Consequently, our reasoning was as follows.…”

Unusual caloric responses in a patient with a fourth ventricular ependymoma

“…As with low velocity reversals, small vertical components (usually upbeating) commonly occur after caloric stimulation of the horizontal semicircular canal in normal subjects [6,7]. The small vertical component that does not exceed 50% of the horizontal component probably results from caloric activation of the vertical canals (usually the anterior) [7].…”

“…The small vertical component that does not exceed 50% of the horizontal component probably results from caloric activation of the vertical canals (usually the anterior) [7]. When the response to horizontal canal stimulation has a greater vertical than horizontal component, it is called perverted caloric nystagmus and it indicates a lesion within the central VOR pathways.…”

Comparative Study Between the Auditory and Vestibular Functions in Ménière’s Disease

“…Bithermal caloric test was used to assess the lateral semicircular canal function on both sides of the head separately, also with the function of the superior parts of the vestibular nerve. 9 The test was performed using a CHARTR air caloric stimulator: NCA-200. Air stimulus was used (with constant airflow at 25 °C and 50 °C, 5 L/min for 40 seconds), and eye movements were recorded by an electronystagmography system.…”