Vertical canal function in normal subjects and patients with benign paroxysmal positional vertigo.
Objectives To assess the dynamics of the vertical semicircular canal (VSCC)-ocular reflex in normal subjects and then to compare their gain in VSCC-ocular reflex with that of patients with benign paroxysmal positional vertigo (BPPV). Material and Methods Subjects were sinusoidally rotated around the...
| Publicado en: | Acta Oto-Laryngologica Vol. 124; no. 9; pp. 1046 - 1053 |
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| Autores principales: | , , , , , , , , |
| Formato: | Journal Article |
| Publicado: |
Taylor & Francis Ltd
Nov2004
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=106083101&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 106083101 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00016489 B6D jtl: Acta Oto-Laryngologica issn: 00016489 maglogo: Y pubinfo: dt: Nov2004 vid: 124 iid: 9 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 106083101 2009400214 NLM15513548 106083101 ppf: 1046 ppct: 7 formats: fmt: @attributes: type: P tig: atl: Vertical canal function in normal subjects and patients with benign paroxysmal positional vertigo. aug: au: Sekine K Imai T Morita M Nakamae K Miura K Fujioka H Kubo T Tamura K Takeda N sug: subj: Semicircular Canals Physiology Vertigo Physiopathology Adult Aged Aged, 80 and Over Diagnostic Imaging Methods Eye Movements Female Male Middle Age Nystagmus, Physiologic Physiology Pathologic Processes Complications Rotation Vestibular Function Tests Methods Adult: 19-44 years Aged: 65+ years Aged, 80 & over Middle Aged: 45-64 years Female Male ab: Objectives To assess the dynamics of the vertical semicircular canal (VSCC)-ocular reflex in normal subjects and then to compare their gain in VSCC-ocular reflex with that of patients with benign paroxysmal positional vertigo (BPPV). Material and Methods Subjects were sinusoidally rotated around the earth-vertical axis with their head tilted 60° backward and turned 45° to the right or left side from the sagittal plane at frequencies of 0.1, 0.3, 0.5, 0.7 and 1.0 Hz with a maximum angular velocity of 50°/s. Head rotation to the right side on the right anterior semicircular canal (SCC)-left posterior SCC plane or to the left side on the left anterior SCC--right posterior SCC plane stimulated the pair of VSCCs. Eye movements were recorded on a video imaging system with an infrared charge-coupled device camera, using our new technique for analyzing the rotation vector of eye movements in three dimensions. Results The mean gains in left posterior SCC-ocular reflex in normal subjects ranged from 0.44 at 0.1 Hz to 0.79 at 1.0 Hz, while the mean gains in right anterior SCC-ocular reflex ranged from 0.45 at 0.1 Hz to 0.73 at 1.0 Hz. The mean gains in right posterior SCC-ocular reflex in normal subjects ranged from 0.53 at 0.1 Hz to 0.89 at 1.0 Hz, while the mean gains in left anterior SCC-ocular reflex ranged from 0.53 at 0.1 Hz to 0.88 at 1.0 Hz. Thus, the gains in VSCC-ocular reflex did not differ among the four VSCCs in normal subjects. Similarly, vestibulo-ocular reflex (VOR) gains of the four VSCCs in patients with right- or left-sided BPPV were almost the same at all frequencies compared to those of normal subjects. Conclusion In patients with BPPV, gains in VOR in the four VSCCs were not changed in comparison with those of normal subjects. It is suggested that the mass of free-floating otoconial debris associated with canalolithiasis was too small compared to that of the endolymph to change the canal dynamics. pubtype: Academic Journal doctype: Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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