caloric testing

Caloric testing

Flushing warm and cold water into the ear stimulates the labyrinth and causes vertigo and nystagmus if all the nerve pathways are intact.
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caloric testing 

A neuro-ophthalmic technique in which cold and warm water is used to stimulate the vestibular system creating horizontal nystagmus (called caloric nystagmus or Barany's nystagmus). Cold water placed in the ear induces a fast-beating vestibular nystagmus with the fast phase moving away from the stimulated ear, while warm water causes the fast phase to move in the direction of the stimulated ear. The mnemonic COWS (cold-opposite, warm-same) is used to describe this effect. By placing the subject at a 30-degree upright position, heated or cooled water stimulates the now vertical horizontal semicircular canals.
References in periodicals archive ?
Bilateral caloric testing showed canal paresis on both sides (videonystagmographic analysis; MicroMed, Inc., Chatham, IL, USA) (Figure 2).
Warm caloric testing was done with water at 44[degrees] C and continued for 30 seconds.
Our study population was made up of 60 patients--29 men and 31 women, aged 20 to 82 years (mean: 56.4 [+ or -] 11.4)--with peripheral vestibulopathy who underwent HIT and VNG caloric testing. The HIT was conducted in two protocols: HIT0 and HIT1.
Caloric testing was first studied by the Nobel Prize winner Robert Barany in 1906, and later it was introduced to the otologic practice by Fitzgerald and Hallpike [2] in 1942.
Interpretation and use of caloric testing. Rev Bras Otorrinolaringol 2008; 74: 440-46.
Soileau, "Chronic suppurative otitis media, caloric testing, and rotational chair testing," Otology and Neurotology, vol.
The horizontal semicircular canal can be primarily stimulated by caloric testing. Caloric testing represents the function of SVN, which innervates the horizontal semicircular canal.
However, in those who have ongoing attacks of vertigo, permanent loss of function may initially only be detected by audiogram or caloric testing. Over time, this may become clinically evident, with the added misery of tinnitus and hearing loss with unpleasant sound distortion persisting between attacks.
The test battery including spontaneous nystagmus, head-shaking nystagmus, and the Head Impulse Test could predict a results on caloric testing with sensitivity of 63.6% and specificity of 85.4%.
He explains the anatomy and physiology of normal and impaired vestibular and oculomotor systems, the process of central nervous system compensation, then pretest procedures and the ENG/VNG subtests and their interpretation, including oculomotor, positional/positioning, and caloric testing. Examples of counseling materials and illustrative case studies are included.
Ichijo, "Can caloric testing evaluate the function of vertical semicircular canals?" Acta Oto-Laryngologica, vol.
Caloric testing stimulates mainly the lateral semi-circular canal.