Erfan Bashar
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Hyperkinetic Movement Disorders Classification

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Educational scope notice: This is a study note for medical students, not medical advice, diagnosis, or treatment guidance. Clinical management should follow local protocols and current guidelines.

Before naming a cause, the clinician’s first task is to describe the movement accurately, because the pattern itself usually reveals the category. The framework below organizes hyperkinetic movements by predictability: whether the movement repeats in a fixed, anticipatable form or flows unpredictably from moment to moment. This is a bedside heuristic for triage, not a rigid pathophysiologic taxonomy, and a few phenotypes sit between the poles.

Predictable and regular movements

These repeat in a fixed rhythm or stereotyped form, so the examiner can anticipate how the next movement will look.

  • Tremor (rest, postural, kinetic, intention): rhythmic oscillation at a fairly fixed frequency; timing is predictable even as amplitude varies. Covered in detail in /notes/neurology/hyperkinetic-movement-disorders-tremor/
  • Palatal myoclonus: regular rhythmic jerking of the palate, an atypical myoclonus that can persist during sleep
  • Tics: the same movement or vocalization repeated in stereotyped fashion; characteristically suppressible for a time, with a building urge and rebound, and usually preceded by a premonitory urge

Intermediate movements

These have a recognizable pattern that recurs in the same place but varies in timing or intensity.

  • Dystonia: sustained, patterned contractions recurring in the same region; a light touch to the area (sensory trick, or geste antagoniste) can briefly abolish them
  • Athetosis: slow writhing distal movements, covered with chorea in /notes/neurology/hyperkinetic-movement-disorders-chorea-ballismus/
  • Myokymia: fine continuous undulating contraction confined to one muscle group, such as the eyelid
  • Stereotypies: repetitive, seemingly purposeful but non-functional movements

Unpredictable and fleeting movements

These are irregular and constantly changing in location, amplitude, or character.

  • Chorea: flowing, dance-like, purposeless movements migrating between body parts. Covered in /notes/neurology/hyperkinetic-movement-disorders-chorea-ballismus/
  • Myoclonus: brief shock-like jerks, focal or generalized; some forms are rhythmic and belong with the predictable group, which is why myoclonus appears in both lists
  • Fasciculations: fine flickering twitches of muscle fiber bundles visible under the skin; too small to move a joint, which separates them from myoclonus and chorea
  • Dyskinesia: a general term for abnormal involuntary movements, often drug-induced (for example peak-dose levodopa dyskinesia)

Assessment dimensions

Work through these for every new movement, in roughly this order.

  1. Distribution: focal, segmental, multifocal, generalized, unilateral, or bilateral
  2. Extent: distal versus proximal; which limbs, trunk, face, or vocal tract
  3. Pattern: rhythmic or arrhythmic; stereotyped or variable
  4. Course: acute, subacute, chronic, progressive, episodic, or paroxysmal
  5. Speed: rapid (myoclonus, chorea) versus slow (athetosis, dystonia)
  6. Amplitude: fine flickering versus large flinging
  7. Relation to rest and posture: present at rest (parkinsonian tremor) or only on holding a posture (essential tremor)
  8. Relation to voluntary action: worsening with action, including overflow into the affected part when another limb moves
  9. Sensory tricks: whether a gentle touch briefly relieves the movement, as in dystonia
  10. Emotional modulation: anxiety, stress, and self-consciousness amplify nearly all hyperkinetic movements
  11. Suppressibility and urge: tics are suppressible with a premonitory urge and rebound; brief chorea suppression is reported, with rebound best established in tics; tremor shows no characteristic suppressibility
  12. Sleep behavior: hyperkinetic movements typically fade or disappear in sleep; persistence through sleep redirects the workup, usually toward EEG

Parakinesia and video documentation

Patients with chorea often fold the involuntary movement into a voluntary gesture, so it looks semi-purposeful, fidgety, or restless. This parakinesia is a common reason chorea is missed: the clue is that the pattern never settles into a completed functional act and keeps changing. When the description stays uncertain, especially with paroxysmal or intermittent movements, record a video (with consent) so a specialist can see the pattern and later visits can be compared.

Evidence anchors

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