Positional nystagmus in only one position.The tracings of this patient are abnormal. Some would consider them normal because the nystagmus Nystagmus Definition Rhythmic, oscillating motions of the eyes are called nystagmus. The to-and-fro motion is generally involuntary. Vertical nystagmus occurs much less frequently than horizontal nystagmus and is often, but not necessarily, a sign of occurred in only one position, but nystagmus in any position is abnormal. In order to qualify as nystagmus, there must be at least three well-formed beats of nystagmus, with a minimum average velocity of 1 [degrees]/sec for the 10 seconds of tracing. This type of abnormal tracing is found when the left ear is down, either with the head straight or the neck turned. Most of the time, the undermost ear is the source of the abnormality, and there will be a corresponding reduced vestibular ves·tib·u·lar adj. Of, relating to, or serving as a vestibule, especially of the ear. Vestibular Pertaining to the vestibule; regarding the vestibular nerve of the ear which is linked to the ability to hear sounds. response in that ear on caloric caloric /ca·lo·ric/ (kah-lor´ik) pertaining to heat or to calories. ca·lor·ic adj. 1. Of or relating to calories. 2. Of or relating to heat. evaluation. However, the undermost ear is not always the source of the symptoms. When the caloric response implicates the other ear, this finding takes diagnostic precedence over the positional finding. From Neurotologic Associates, P.C., New York City New York City: see New York, city. New York City City (pop., 2000: 8,008,278), southeastern New York, at the mouth of the Hudson River. The largest city in the U.S. . |
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