Definitions and Types of Nystagmus and Calculations

Kavanagh, Kevin T.; Babin, Richard W.

doi:10.1097/00003446-198606000-00007

Cited by 7 publications

(3 citation statements)

References 42 publications

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“…This is a semi-automated procedure completed under the supervision of an examiner (i.e. audiologist) (Banchi and Beattie, 1991; Kavanagh and Babin, 1986). …”

Section: Methodsmentioning

confidence: 99%

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Vestibular stimulation improves insight into illness in schizophrenia spectrum disorders

Gerretsen

Pothier

Falls

et al. 2017

Psychiatry Research

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Impaired insight into illness (IMP-INS) is common among individuals with schizophrenia spectrum disorders (SSD), contributing to medication nonadherence and poor clinical outcomes. Caloric vestibular simulation (CVS) is typically used to assess peripheral vestibular system function. Left cold CVS is also a transiently effective treatment for IMP-INS and hemineglect secondary to right brain hemisphere stroke, and possibly for IMP-INS and mood stabilization in patients with SSD. Participants with SSD and moderate-to-severe IMP-INS participated in an exploratory double blind, crossover, randomized controlled study of the effects of CVS on IMP-INS. Participants sequentially received all experimental conditions—left cold (4°C), right cold, and body temperature/sham CVS—in a random order. Repeated measures ANOVA were performed to compare changes in IMP-INS, mood and positive symptom severity pre and 30 min post CVS. A significant interaction was found between CVS condition, time, and body temperature nystagmus peak slow phase velocity (PSPV) for IMP-INS, indicating that single session left cold CVS transiently improved IMP-INS while right cold CVS may have worsened IMP-INS, particularly in participants with greater vestibular reactivity (i.e. higher PSPV) to body temperature CVS. The procedure’s effectiveness is attributed to stimulation of underactive right hemisphere circuits via vestibular nuclei projections to the contralateral hemisphere.

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“…This is a semi-automated procedure completed under the supervision of an examiner (i.e. audiologist) (Banchi and Beattie, 1991; Kavanagh and Babin, 1986). …”

Section: Methodsmentioning

confidence: 99%

“…A custom software-generated plot was used to display the velocity of each measured beat of nystagmus across time. The audiologist visually identified and excluded outliers distinct form the cluster, and then selected the beat of nystagmus from the cluster with PSPV (Kavanagh and Babin, 1986). This process was repeated for each caloric stimulus.…”

Section: Methodsmentioning

confidence: 99%

Vestibular stimulation improves insight into illness in schizophrenia spectrum disorders

Gerretsen

Pothier

Falls

et al. 2017

Psychiatry Research

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“…Vertical nystagmus has a unique value over horizontal nystagmus. While both central and peripheral vestibular disorders may demonstrate horizontal nystagmus, vertical nystagmus is strongly suggestive of central vestibular disorder (Busis, 1973;Kavanagh & Babin, 1986;Rudge, 1983). Thus, the presence of vertical beats rule in the central vestibular system as a partial, if not total, contributor to the patient's balance disorder.…”

Section: Discussionmentioning

confidence: 99%

Diagnostic Value of Vertical Nystagmus Recorded from ENG

Allard

Welsh²

1990

Ear and Hearing

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A patient with a cerebellar hemorrage was evaluated using electronystagmography (ENG). Data obtained on the horizontal channel were only mildly abnormal. However, vertical nystagmus was clearly evident when the patient was tested in a darkened room with eyes open. This additional procedure may have saved the patient severe complications. With eyes open in darkness vertical nystagmus is more easily differentiated from eye blinks and clinicians are encouraged to look for this valuable central vestibular system sign.

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