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Query: UMLS:C0012833 (dizziness)
 9,689 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Tinnitus as a symptom remains a serious multidisciplinary problem. Vertigo or dizziness is not noticed frequently in tinnitus patients, so vestibular function is not often studied. Because they are in close proximity to one another, the vestibular and hearing organs may influence each other. We decided to evaluate the results of the oculomotor reflex in tinnitus patients. We carried out clinical examinations and audiological and oculomotor tests in 50 tinnitus patients and 30 healthy persons. Such oculomotor tests as smooth-pursuit eye movement, optokinetic tests, and saccadic eye movement and gaze fixation were performed. Tinnitus was unilateral in 37 tinnitus patients (74%) and bilateral in 13 (26%). Twenty-two tinnitus patients (44%) reported previous remote episodes of vertigo and dizziness. Gaze-evoked nystagmus was absent in all cases. Morphological abnormalities and gain decreases in smooth-pursuit tests were recorded in 19 tinnitus patients (38%). Findings in the optokinetic test were incorrect in 10 (20%). The saccadic eye movement test showed disturbances in 18 tinnitus patients (36%). In 11 (22%), abnormal recordings were found in two tests and, in 10 (20%), abnormal recordings were found in all three tests. Our study suggests that computerized, quantitative electronystagmographic analysis in tinnitus patients should be interpreted carefully. A persistence of abnormal oculomotor recordings can suggest subclinical central vestibular system impairment.
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PMID:Evaluation of oculomotor tests in patients with tinnitus. 1476 19

Vestibular syndromes are one of the commonest paroxysmal disorders in our clinical practice. These consist of vertigo, oculomotor abnormalities (nystagmus), postural changes and nausea/vomiting. Vertigo can be classified as real vertigo and dizziness, based upon the presence of clinical rotatory perception. In order to diagnose a responsible lesion for various central and peripheral vestibular syndromes, we have to carefully observe nystagmus in patients with acute vertigo. Gaze-evoked nystagmus is the most important nystagmus in patients with the central vestibular syndromes. The finding is easily found at the bed side examination. In order to keep a velocity-position neural signal such as gaze holding, the neural structure to hold and maintain the neural command for a saccade is hypothesized and this has been called as the brainstem neural integrator, which sends tonic-step commands for eccentric gaze. If this fails then the integrator becomes leaky and the eyes drift back to the central position. This movement necessitates corrective saccades, hence gaze-evoked nystagmus will ensue. Vertical nystagmus such as primary position upbeat or downbeat nystagmus is also seen only in the central vestibular syndromes. The detection and diagnosis of these characteristic nystagmus are essential for primary clinicians who care patients with acute vertigo.
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PMID:[Overview: diagnosis of vestibular syndromes]. 2227 89