Outward Versus Inward Head Thrusts with Video-Head Impulse Testing in Normal Subjects
2015; Lippincott Williams & Wilkins; Volume: 36; Issue: 3 Linguagem: Inglês
10.1097/mao.0000000000000698
ISSN1537-4505
AutoresAnastasia Nyström, Fredrik Tjernström, Måns Magnusson,
Tópico(s)Cerebral Venous Sinus Thrombosis
ResumoTo investigate the effect of outward and inward head thrusts on the efficacy of compensatory eye movements generated during the video-Head Impulse Test (v-HIT) in healthy subjects.Diagnostic. Rapid movements of the head were performed either from the midline towards the side (outward thrusts) or from the side towards the midline (inward thrusts).Gain of the vestibulo-ocular reflex (VOR) as reported by two different v-HIT devices.A small but statistically significant increase of the VOR gain was found for outward impulses. This small difference is likely to be attributed to increased neck strain during outward impulses, and/or hypothetically, that an effect of Alexander's law during fast, high-frequency VOR could play a role. However, the differences are minute.We conclude that because the difference in the VOR gain between outward and inward thrusts was slight, both methods are acceptable for clinical use.
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