St. Vitus dance
    
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St. Vitus dance

Definition

Sydenham chorea is a movement disorder associated with rheumatic fever.

Alternative Names

St. Vitus dance

Causes

Sydenham chorea is one of the major signs of acute rheumatic fever. It is discussed here as a separate entity because it may be the only sign of rheumatic fever in some patients.

The movements seen in Sydenham chorea are involuntary, jerky, and purposeless. They are not rhythmic and occur sporadically in different muscle groups. For example, a sitting child might suddenly have an arm jerk upward followed by a leg extension, then a head nod. The movements occur in such a way that the child is constantly in motion and seems to be twitching everywhere.

Fine motor control becomes difficult, and handwriting may change dramatically.

Sydenham chorea occurs most frequently in prepubescent girls but may be seen in boys.

Symptoms

  • History of sore throat preceding, by several weeks, the appearance of Sydenham's chorea
  • Onset of uncontrollable movements
  • Movements are jerky and purposeless
  • Loss of fine motor control
  • Emotional lability with bouts of inappropriate crying or laughing
  • Any other signs of rheumatic fever (see acute rheumatic fever)

Exams and Tests

There may be a history of sore throat for several weeks preceding the appearance of Sydenham's chorea.

Blood tests that may show signs of rheumatic fever include:

  • ESR
  • ASO
  • CRP (C-reactive protein)
  • Streptozyme test
Other tests related to acute rheumatic fever:
  • ECG
  • Echocardiogram (ultrasound of the heart)

Treatment

Antibiotics are given to assure clearing of streptococci, the bacteria that cause rheumatic fever. Continuous preventive antibiotics (antibiotic prophylaxis) may be prescribed.

Supportive care is given as necessary to control symptoms of Sydenham chorea. Sedation may be advised in severe cases.

Outlook (Prognosis)

Sydenham chorea generally clears up over a course of several months. Under unusual circumstances, a variant form of Sydenham chorea may begin later in life.

Possible Complications

No complications are expected.

When to Contact a Medical Professional

Call your health care provider if your child develops uncontrollable or jerky movements suggestive of this disease, especially if the child has recently had a sore throat.

Prevention

Careful attention to children's complaints of sore throats and early treatment if they are determined to have streptococcus generally will prevent acute rheumatic fever. If there is a strong family history of rheumatic fever, parents should be especially watchful as their children may be particularly susceptible to this infection.

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