caloric test


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caloric

 [kah-lor´ik]
pertaining to heat or to calories.
caloric test a test of third, sixth, and eighth cranial nerves. Irrigation of the normal ear with warm water produces caloric nystagmus toward the irrigated side; irrigation with cold water produces similar nystagmus away from that side. Called also oculovestibular test.

Bá·rá·ny ca·lor·ic test

(bah'rah-nē),
a test for vestibular function, made by irrigating the external auditory canal with cool and warm water; this thermal stimulation of the vestibular apparatus results in nystagmus and past-pointing; in vestibular disease, the response may be reduced or absent.

caloric test

Neurology A test of vestibular function in which the ear canal is irrigated with cold and hot water, which often identifies an impairment or loss of thermally induced nystagmus on the involved side; the use of thermic stimuli to induce endolymphatic flow in the horizontal semicircular canal and horizontal nystagmus by creating a temperature gradient between the 2 sides of the canal

caloric test

A test of the balancing mechanisms in the inner ear. Instillation of hot and cold water into the ear causes jerky movement of the eyes (NYSTAGMUS) if the vestibular apparatus is functioning normally. If, however, there is disease of the balancing mechanism (semicircular canals) the nystagmus will be absent or much reduced in extent.

Bárány,

Robert, Austrian-Hungarian otologist and Nobel laureate, 1876-1936.
Bárány alarm apparatus
Bárány apparatus
Bárány box
Bárány caloric test - a test for vestibular function. Synonym(s): caloric test; nystagmus test
Bárány chair
Bárány noise apparatus
Bárány noise apparatus whistle
Bárány sign - nystagmus induced by injecting either hot or cold water into the external ear canal in the caloric test.
Bárány syndrome - the direction of a fall is influenced by changing head position in the presence of equilibrium disturbance.
Bárány test
positional vertigo of Bárány - brief attacks of paroxysmal vertigo and nystagmus due to labyrinthine dysfunction. Synonym(s): benign positional vertigo
References in periodicals archive ?
Caloric tests are an integral part of peripheral vestibular testing.
The vestibular function was analyzed after unilateral CI, in 43 children in the period from 2001 to 2010, by means of computed tomography (CT) of the temporal bone before surgery, as well as through caloric tests, cephalic impulse test and Vestibular Evoked Myogenic Potentials.
The caloric test has been used for many years in the detection of vestibular damage and is accepted as a reference standard.
In clinical assessment, sensitivity of tests set for vestibular pathology was 88% in comparison to caloric test results, specificity was 78%.
Unfortunately, the physical origins of the caloric test have also been an ongoing controversy.
Both caloric test and VEMPs are sensitive yet unspecific measures regarding tumor side.
By convention, caloric tests used binaural, bithermal, closed loop air irrigations of 40-s durations with warm (50[degrees]C) and cold (24[degrees]C) temperatures separately.
Systemic examination, local examination of the ears, nose and throat, routine investigations including blood sugar level (Fasting and post prandial), blood urea level, serum creatinine, serum electrolytes, audiometry and caloric tests were carried out in all patients.
The bithermal caloric test results were: normal: 40.9%, unilateral weakness (pathological side of unilateral MD): 55.9%, and bilateral weakness: 3.2%.
The caloric test revealed normal directional preponderance of 11% to the right and abnormal caloric weakness of 59% to the left.
Each patient received a caloric test, vestibular-evoked myogenic potential (VEMP) test, and cochlear nerve function test (hearing) before the operation and 1 week, 3, and 6 months, postoperatively.