めまいの感覚について（第一報）　めまいの回転方向と眼振方向との関係

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  • Sensation of Dizziness. Correlations of Direction of Rotation and Direction of Nystagmus.
  • Correlations of Direction of Rotation and Direction of Nystagmus
  • めまいの回転方向と眼振方向との関係

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Patients who suffer from dizziness have various sensations, such as a sense of rotation or unsteadiness. To understand these differences, we investigated the sensation of dizziness during caloric testing and correlated the direction of rotatory sensation with nystagmus in 51 healthy adults who had no vestibular disorders.<BR>During caloric testing, 79.8% reported a sensation of rotation, 13.7% felt unsteady and only 6.5% had neither sensation. Of those with a sensation of rotation, 79.1% had nystagmus to the direction of sensation and 20.9% had nystagmus to the opposite side. During caloric testing with eyes-open in the light, most of the subjects felt as though the outside world were rotating, while in tests with eyes-open in the dark or with eyes-closed, most subjects felt themselves rotating.<BR>Caloric tests evoked quick and slow phases of nystagmus. It has been understood that the image of the outside world is caugnt by the fovea in the slow phase. If the quick phase of nystagmus is induced to the left, when the eye moves from right to left, the image of the surroundings seems to move from left to right. It was concluded that the direction of the sense of rotation in dizziness corresponds to the direction of nystagmus.

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