Cervically induced ocular torsion : Physiological and clinical aspects
article
Five healthy subjects were submitted to sinusoidal lateral tilt (amplitude 25° at frequency of 0.2Hz) of the whole body, only the head, or only the trunk about a vertical (subject in upright position) and about a horizontal axis (subject in supine position). The ocular torsioation of the neck by manipulating only the trunk had a negligible effect on ocular torsion. The cervical contribution to OT was best visible as the difference between the ocular torsion signals obtained in conditions of head tilt and conditions with whole body tilt. Apparently stimulation of the semicircular canals facilitates the cervically induced ocular torsion. Contribution of the neck did not affect the slow component, but produced an anticompen-satory modulation of the beating field offset (analogous to gaze shift). As a result, the excursion range of torsional eye position was smaller during head tilt than during body tilt. Static tilt conditions (25° tilt) of only the trunk, only the head or of the whole body showed similar data, although of smaller amplitude.
With patients suffering from a post-whiplash syndrome only the static upright conditions could be examined with smaller tilt angles. Their results were very similar to those of the healthy controls, showing large intersuthose of the healthy controls, showing large intersuintersubject variability. These results are not in favor of direct implementation of this sort of tests in the vestibular test battery to objectify cervical eye torsion, since a clinical meaning could not be established so far.
With patients suffering from a post-whiplash syndrome only the static upright conditions could be examined with smaller tilt angles. Their results were very similar to those of the healthy controls, showing large intersuthose of the healthy controls, showing large intersuintersubject variability. These results are not in favor of direct implementation of this sort of tests in the vestibular test battery to objectify cervical eye torsion, since a clinical meaning could not be established so far.
Topics
Eye movementsNeckSaccadesVestibularWhiplash traumaarticlecervical spineclinical articlecontrolled studyfemalehead tiltinghumanlocomotionmalepriority journalsaccadic eye movementsensory systemstandingstatistical analysissupine positiontrunkvestibular functionwhiplash injuryAdultAnalysis of VarianceEye MovementsFemaleHumansMaleMiddle AgedReference ValuesRotationSyndromeTilt-Table TestTorsionWhiplash Injuriesvestibular systemeye movementscervical spinehealth
TNO Identifier
9208
Source
Acta Otolaryngol (Stockholm), 118(5), pp. 613 - 617.
Pages
613 - 617
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