Motorized head impulse rotator for horizontal vestibulo-ocular reflex: Normal responses.
Arch Otolaryngol Head Neck Surg
; 133(2): 157-61, 2007 Feb.
Article
em En
| MEDLINE
| ID: mdl-17309985
ABSTRACT
OBJECTIVE:
To characterize the horizontal angular vestibulo-ocular reflex using a new motorized head impulse rotator and electro-oculography technique.DESIGN:
Prospective case-control study.PARTICIPANTS:
We included 22 healthy volunteers with unpredictable, horizontal motorized head impulses with a mean velocity of 170 degrees/s and a mean acceleration of 1550 degrees/s2. We recorded head and eye position and calculated gain, asymmetry, and latency of the vestibulo-ocular reflex. All subjects underwent testing twice while viewing a far (140 cm) target to evaluate the repeatability of the measurement. In addition, 8 of these subjects underwent testing while viewing a near (15 cm) target. We reported findings as mean +/- SD.RESULTS:
The mean gain during the 30-millisecond interval before peak head velocity and during the interval when head velocity ranged from 100 degrees /s to 120 degrees/s was 1.08 +/- 0.10. The mean asymmetry in gain between sides was 3.7% +/- 2.8%, and the mean latency of the vestibulo-ocular reflex was 3.4 +/- 6.3 milliseconds. There was a statistically significant correlation between consecutive gain measurements for each subject (r = 0.59; P=.004). The mean gain for the near target was 1.26 +/- 0.10 and was significantly higher than that for the far target (P = .002).CONCLUSIONS:
The vestibulo-ocular reflex measurements using our novel system are comparable to those achieved using other techniques. These results suggest that a motorized head impulse rotator with electro-oculography allows reliable and fast measurement of the vestibulo-ocular reflex. In addition, the method is safe, repeatable, and thus could be a useful tool in the clinical assessment of the vestibulo-ocular reflex.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Reflexo Vestíbulo-Ocular
/
Movimentos Oculares
/
Movimento
Tipo de estudo:
Observational_studies
Limite:
Adult
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article