Analysis of Head Shaking Nystagmus Using an Infrared CCD Camera

Head-shaking nystagmus

Head-shaking nystagmus. Head-Shaking Nystagmus (HSN) is a latent spontaneous vestibular nystagmus provoked by rapid passive head shaking around a vertical axis. HSN is not specific in distinguishing peripheral hypofunction from more central vestibular imbalances. This test is an excellent bedside test for detecting unilateral vestibular hypofunction but further rotatory and caloric testing will...

[Diagnostic value of head-shaking nystagmus in vestibular clinical evaluation].

OBJECTIVES To determine the sensitivity and specificity of the head-shaking nystagmus test (HSN), the nystagmus elicited in response to a vigorous rotation of the head in the horizontal plane, in the study of patients with peripheral unilateral vestibular disease. PATIENTS AND METHODS Retrospectively, we analyze the relationships between the HSN and the rest of the videonystagmographic tests ...

A comparative study on the observation of spontaneous nystagmus with Frenzel glasses and an infrared CCD camera.

OBJECTIVES To compare the usefulness of a CCD camera with infrared illumination (IR-CCD camera) over Frenzel glasses (F Glasses) for the observation of spontaneous nystagmus, the incidence and direction of nystagmus, and the frequency, amplitude and slow phase of spontaneous nystagmus. METHODS One hundred vertiginous patients, fifty-three females and forty-seven males participated in this stu...

Head shaking and vestibulo-ocular reflex in congenital nystagmus.

The authors investigated the mechanisms underlying the head shaking shown by some patients with congenital nystagmus (CN). In order to improve visual function by head shaking, a patient with CN must have some visual acuity loss due to retinal image motion created by the nystagmus; an abnormal vestibulo-ocular reflex (VOR); and the head shaking must be correlated with the nystagmus. The authors ...

Kinetic PCR Analysis Using a CCD-camera