The relationship between head and eye movement in congenital nystagmus with head shaking: objective recordings of a single case.

AUTOR(ES)

Gresty, M.

RESUMO

Head shaking and congenital nystagmus were recorded in a patient presented with visual tasks. When she was at rest the nystagmus took a 6 cycles per second saw-tooth wave-form. When she was attentive the nystagmus beat at a 2 to 2.6 cycles per second with a saddle-shaped deformation which permitted foveation. The head shaking occurred occasionally when the patient was attentive and was phase-locked to the nystagmus with resemblances in wave form and direction. Deceleration of the head shaking to zero velocity and peak displacement (to the left) coincided with the onset of the saddle of the nystagmus and hence assisted foveation; all other parts of the head-shaking cycle were detrimental to vision. It is proposed that the head shaking has a common pathological origin with the nystagmus and that, just as an isolated congenital nystagmus wave form becomes altered with attention to permit periods of foveal fixation, the pattern of combined head and eye nodding in this patient provided similar peroids of fixation.

Documentos Relacionados

• A case of "voluntary nystagmus" and head tremor.
• A study of head and eye movement in spasmus nutans.
• The clinical application of head-shaking test combined with head-shaking tilt suppression test in distinguishing between peripheral and central vertigo at bedside vs. examination room
• Spasmus nutans or congenital nystagmus? Classification according to objective criteria.
• The usefulness of functional imaging in movement disorders: an illustrative case.