Neuere Aspekte des vestibulookulären Reflexes

Clarke, A. H.

doi:10.1007/978-3-642-79553-4_3

Cited by 4 publications

(5 citation statements)

References 237 publications

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“…Auf mögliche diskrepante Befunde zwischen der thermischen und der Pendeldrehprüfung wiesen bereits Telian et al [18] Ein weiteres grundsätzliches Problem der Vestibularisdiagnostik wird hierbei ebenfalls deutlich. Es werden in der verbreiteten Diagnostik nur sekundäre, z. T. mehrfach verschaltete motorische Afferenzen beurteilt, was einen Teil der oben genannten methodeninhären-ten Probleme der Vestibularisdiagnostik erklärt [6].…”

Section: Diskussionunclassified

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Der beidseitige Vestibularisausfall

Frese¹,

Reker²,

Maune³

2003

HNO

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Section: Diskussionunclassified

“…Bei langsamen Kopfbewegungen unterhalb von 1 Hz stabilisieren dagegen mehr die Augenfolgebewegungen die Blickachse [1]. Das Auftreten der Oszillopsien resultiert daher nach gängiger Meinung überwie-gend aus dem Wegfall des VOR, da das Labyrinth nicht die vestibuläre Information für die schnelle Stabilisierung der Sehachse liefert [1,6].…”

unclassified

Der beidseitige Vestibularisausfall

Frese¹,

Reker²,

Maune³

2003

HNO

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“…Horizontal and vertical positions of the eye are quantified by detection of the center of the pupil from the video image by automatic image recognition. Ocular torsion (around an axis close to the visual axis) is reflected by the rotation of the natural iris, or by rotation of artificially applied markers on the sclera [5,6]. The rotation of the iris or scleral markers in each video frame is measured by image recognition techniques by comparing the actual orientation with a reference image.…”

Section: Equipment To Quantify Eye Torsion and Head Orientationmentioning

confidence: 99%

“…13]. Two degrees of spontaneous eye torsion are considerable compared to the maximum OCR of 5-6° generally found at 40° head roll [1,6,10,11,[14][15][16].…”

Section: Healthy Subjectsmentioning

confidence: 99%

Evaluation of the Statolith Function by Measurement of Ocular Counterrolling?

Kingma¹,

Kavelaars²,

Tienen³

et al. 2001

Otorhinolaryngol Nova

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Ocular counterrolling (OCR) induced by lateroflexion, whole body roll, eccentric rotation or translational acceleration has been explored and promoted as an indicator of the vestibular statolith function. Quantification of eye torsion induced by stimulation of the statolith organ has recently become available for broad clinical application thanks to the development of video nystagmography. The most simple way and maybe clinically the most attractive procedure to induce OCR could have been by changing the orientation of the statolith system relative to the gravitation vector, i.e. by lateroflexion of the head. However, irrespective of the visual condition, irrespective of the type of head roll, static or dynamic, OCR showed considerable inter- and intravariability. Findings in healthy subjects and patients indicate that according to our current insight, measurement of OCR induced by lateroflexion or whole body roll has a limited sensitivity and specificity. The normal range of OCR in healthy subjects is large (4.5–9.0% and could be interpreted as a functional asymmetry in statolith function that does not really exist. At present there are insufficient clinical data available to judge the clinical relevance of this test. OCR induced by sideward translations has the advantage over the previously described techniques that it allows an evaluation of the frequency characteristics of the statolith function. Major problems with this technique are that the equipment required is complex and expensive, that a appropriate head fixation is difficult and that responses are quite small. So far, the scarce clinical data do not yet point to a clear clinical relevance of this approach.

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“…Die vestibuläre l<ompensation erfolgt haufig durch Substitution [4,28] bzw. Umorganisation [6] peripher-vestibularer Funktionen durch ubergeordnete Strukturen. In vielen Untersuchungen zeigte sich, da8 die subtile frequenzabhangige Funktionsanalyse des VOR em sensitiver Parameter zur Beurteilung der vestibulären Funktion sowie zur Diagnosefindung sein kann [1,15,32].…”

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