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Nystagmus

Aka: Nystagmus
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  1. Definitions
    1. Direction of Nystagmus
      1. Named for quick component of Nystagmus
    2. Speed
      1. Slow Nystagmus: <40 jerks per minute
      2. Fast Nystagmus: >100 jerks per minute
    3. Amplitude
      1. Fine Nystagmus: <1 mm
      2. Coarse Nystagmus: >3 mm
    4. Involvement
      1. Associated Involvement: Bilateral eyes
      2. Dissociated Involvement: Unilateral eye
  2. Indication: Vertigo Evaluation
    1. Absent Nystagmus in acute severe Vertigo is unusual
      1. Casts doubt on the symptom
  3. Normal Findings: Lateral gaze Nystagmus
    1. Associated with stretch receptor
    2. All patients have a few beats of end point Nystagmus
  4. Abnormal Findings
    1. Spontaneous on Forward gaze or on moderate lateral gaze
    2. Direction
      1. Horizontal Nystagmus indicates peripheral disease
        1. Unilateral vestibular pathology
      2. Vertical Nystagmus indicates Central DIsease
        1. Brain Stem lesion
  5. Causes of Nystagmus in Infants and Children
    1. Albinism (iris and Retinal Hypopigmentation)
    2. Bilateral Optic Nerve hypoplasia
      1. Seen in de Morsier's Syndrome
    3. Bilateral media opacities
    4. Achromatopsia
    5. Usher's Syndrome (Retinitis Pigmentosa)

Nystagmus (C0028738)

Definition (NCI) A disorder characterized by involuntary movements of the eyeballs.
Definition (CHV) involuntary, rapid, rhythmic movement of the eyeball
Definition (MSH) Involuntary movements of the eye that are divided into two types, jerk and pendular. Jerk nystagmus has a slow phase in one direction followed by a corrective fast phase in the opposite direction, and is usually caused by central or peripheral vestibular dysfunction. Pendular nystagmus features oscillations that are of equal velocity in both directions and this condition is often associated with visual loss early in life. (Adams et al., Principles of Neurology, 6th ed, p272)
Definition (PSY) Eye movement reflex stabilizing the retinal image of a visual stimulus to compensate for head or stimulus movement. Also, eye movement defects resulting from neurological, muscular, or genetic disorders.
Definition (NCI) Involuntary movements of the eyeballs. The presence or absence of nystagmus is often used in the diagnosis of a variety of neurological and visual disorders.
Definition (CSP) involuntary, rapid, rhythmic movement of the eyeball.
Concepts Disease or Syndrome (T047)
MSH D009759
ICD9 379.50
ICD10 H55.00, H55.0
SnomedCT 194172000, 563001, 194171007
French NYSTAGMUS, Nystagmus SAI, Nystagmus, non précisé, Nystagmus, Nystagmus pathologique
English NYSTAGMUS, Nystagmus, NOS, Nystagmus, unspecified, Unspecified nystagmus, nystagmus (physical finding), nystagmus, Nystagmus NOS, Nystagmus, Pathologic, Pathologic Nystagmus, Unspecified nystagmus (disorder), Nystagmus, Pathologic [Disease/Finding], Nystagmus (disorder), Nystagmus
Portuguese NISTAGMO, Nistagmo NE, Nistagmo, Nistagmo Patológico
Spanish NISTAGMO, Nistagmus NEOM, Nistagmus no especificado, Nystagmus, nistagmo (trastorno), nistagmo no especificado (trastorno), nistagmo no especificado, nistagmo, nistagmus no especificado, Nistagmus, Nistagmo Patológico, Nistagmo Patologico
German NYSTAGMUS, Nystagmus, unspezifisch, Nystagmus NNB, Nystagmus, Nystagmus, pathologischer
Italian Nistagmo, Nistagmo NAS, Nistagmo, non specificato, Nistagmo patologico
Dutch niet-gespecificeerde nystagmus, nystagmus NAO, nystagmus, Nystagmus, pathologische, Pathologische nystagmus
Japanese 眼振ＮＯＳ, 眼振、詳細不明, ｶﾞﾝｼﾝ, ｶﾞﾝｼﾝｼｮｳｻｲﾌﾒｲ, ｶﾞﾝｼﾝNOS, 眼球振盪, 周期性交代眼振, 垂直眼振, 輻輳眼振, 振子様眼振, 眼振-病的, 眼球振とう, 眼球振盪症, 水平眼振, ニスタグムス, シーソー眼振, 律動眼振, 病的眼振, 回旋眼振, 眼振
Swedish Nystagmus, patologisk
Czech nystagmus patologický, Nystagmus, Nystagmus NOS, Nystagmus, blíže neurčený
Finnish Silmävärve
Russian NISTAGM PATOLOGICHESKII, NISTAGM, НИСТАГМ, НИСТАГМ ПАТОЛОГИЧЕСКИЙ
Croatian NISTAGMUS, PATOLOŠKI
Polish Oczopląs pionowy, Oczopląs patologiczny, Oczopląs poziomy
Hungarian Nystagmus k.m.n., Nystagmus, nem meghatározott, Nystagmus
Sources
Derived from the NIH UMLS (Unified Medical Language System)


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