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01.01.2012 | Otology | Ausgabe 1/2012

European Archives of Oto-Rhino-Laryngology 1/2012

Cupulolithiasis of the horizontal semicircular canal

Zeitschrift:
European Archives of Oto-Rhino-Laryngology > Ausgabe 1/2012
Autor:
Hiroaki Ichijo
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s00405-011-1583-1) contains supplementary material, which is available to authorized users.

Abstract

To clarify whether positional nystagmus of horizontal cupulolithiasis contains vertical and torsional components, and to quantify the asymmetry, we analyzed nystagmus in four positions (healthy-ear-down, affected-ear-down, supine, nose-down), using 3-dimensional video-oculography. Subjects were 20 patients with direction-changing apogeotropic positional nystagmus, 11 females and 9 males, with a mean age of 58.1 years. Nystagmus was recorded using an infrared camera and the findings were converted to digital data. Using ImageJ, we performed 3-dimensional video-oculography and measured maximum slow-phase velocity (MSV) of three components. Positional nystagmus was not purely horizontal. Eleven (55%) patients revealed a vertical component, and 14 (70%) patients had a torsional component in the healthy-ear-down position. The mean value of MSV of the horizontal component in the healthy-ear-down position was 18°/s and that in the affected-ear-down position was 7.8°/s. For the horizontal component, MSV in the healthy-ear-down position was significantly greater than that in the affected-ear-down position (p < 0.01). These results suggest that vertical and torsional components occur from the horizontal semicircular canal, and the response to ampullopetal bending is more than two times as strong as that to ampullofugal bending.

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Zusatzmaterial
Positional nystagmus of right cupulolithiasis.
Literatur
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