Presenting History
When evaluating a pediatric patient with involuntary, purposeless, non-stereotyped movements (Chorea), obtain a comprehensive chronological account of symptoms. Sydenham's Chorea (St. Vitus' Dance) is the major neurological manifestation of Acute Rheumatic Fever (ARF), arising from molecular mimicry between group A streptococcal antigens and basal ganglia (caudate/putamen) gangliosides.
- Characteristics of Involuntary Movements:
- Onset & Course: Rapid or insidious onset; migratory, non-repetitive, rapid, jerky, purposeless, quasi-purposive movements (patient tries to camouflage choreic twitches into deliberate actions).
- Topography: Distal extremities (fidgety hands, dropping glasses/pencils), facial grimacing, tongue clicking/farting sounds, or trunk swaying. Symmetrical vs unilateral (Hemichorea in ~20%).
- Sleep & Stress: Characteristically disappears during sleep and is exaggerated by emotional stress, fatigue, or voluntary movement.
- Motor Weakness & Hypotonia (Chorea Paralytica):
- Inquire about severe clumsiness, difficulty walking, dropping objects, buttoning, handwriting deterioration, or inability to feed and dress oneself.
- Behavioral & Neuropsychiatric Symptoms:
- Inquire about emotional lability, sudden bouts of crying/laughing, obsessive-compulsive behaviors (OCD traits), anxiety, irritability, and school deterioration.
- Speech & Oromotor Difficulties:
- Inquire about slurred, explosive, or hesitant speech ("staccato speech" or transient mutism) and tongue unsteadiness.
Negative History (3C 1D Framework)
| Category | Pertinent Negative Question | Rationale / Significance |
|---|---|---|
| Causes (Rheumatic / Strep) | History of sore throat (streptococcal pharyngitis) 1 to 6 months prior? | Sydenham's chorea has a long latent period (1–6 months post-strep) and is often the sole manifestation of ARF. |
| Causes (Cardiac / Joints) | History of migratory joint pains, chest pain, palpitations, or breathlessness? | Evaluates concurrent Rheumatic Carditis (mitral regurgitation / Carey Coombs murmur) or polyarthritis. |
| Causes (Drug-Induced) | History of antiepileptic (phenytoin), neuroleptic, metoclopramide, or methylphenidate intake? | Rules out drug-induced tardive dyskinesia or chorea. |
| Complaints (Progression) | History of persistent rhythmic stereotyped repetitive twitches preceded by an urge? | Distinguishes chorea from Motor Tics / Tourette Syndrome. |
| Complications | History of bedsores, severe weight loss, or inability to swallow (Chorea Paralytica)? | Identifies severe debilitating chorea requiring hospital admission and tube feeding. |
| Differentials (Mimics) | History of butterfly rash, alopecia, oral ulcers, joint swelling, or renal disease? | Rules out Systemic Lupus Erythematosus (SLE / Neuropsychiatric SLE / APLA). |
| Differentials | History of jaundice, chronic liver disease, declining scholastic performance, or tremors? | Rules out Wilson Disease (copper storage hepatolenticular degeneration). |
| Differentials | History of positive family history of early dementia, psychiatric illness, or chorea in parents? | Rules out Huntington Disease (autosomal dominant CAG repeat disorder; juvenile onset presents with Westphal rigidity variant). |
Other Relevant History
- Treatment & Secondary Prophylaxis: Details of oral penicillin, Benzathine Penicillin G injections, Valproate, or Haloperidol therapy.
- Developmental & School History: Pre-morbid academic standing and handwriting samples in school notebooks (look for deterioration to illegible scribbling).
History Summary
"I would like to summarize the history of this Age in years old Male / Female child, Birth order order child born to Consanguineous / Non-consanguineous parentage from Geographic Location, who presented with insidious onset involuntary, rapid, jerky, non-repetitive movements of Upper limbs / Lower limbs / Face / Hemibody of Duration in weeks, handwriting deterioration, emotional lability, and clumsy gait, preceded by a sore throat Duration in months ago, with movements absent during sleep.
In view of the classical choreiform hyperkinesia, distal predilection, emotional lability, and latency period following streptococcal pharyngitis, I would like to consider a clinical diagnosis of Sydenham's Chorea (Rheumatic Chorea), with No active polyarthritis, and With / Without clinical evidence of rheumatic carditis."
General & Head-to-Toe Examination
Pre-Examination Child Behavioral State
- Child State: Alert, restless, emotionally labile, fidgety, fidgeting movements of hands and face (Active hyperkinetic state).
Classical Semiological Signs of Chorea
- Pronator Sign: When the child is asked to hold both arms elevated straight above the head with palms facing inward, the forearms involuntarily hyperpronate so that the palms turn outward (dorsa of hands face each other) due to hypotonia and choreic posturing.
- Choreic Hand (Spoon / Dish Hand): When arms are extended forward, the wrist flexes while the metacarpophalangeal joints hyperextend, creating a scooped, saucer-like appearance.
- Milkmaid's Grip (Trombone Grip): When the child is asked to squeeze the examiner's index and middle fingers continuously, the grip shows rhythmic, intermittent relaxations and tight contractions (unable to maintain sustained muscular contraction).
- Jack-in-the-Box / Chameleon Tongue: When asked to protrude the tongue and hold it out for 10 seconds, the tongue darts in and out involuntarily like a lizard or chameleon, unable to remain stably protruded.
- Hung-up Reflex (Gordon's Knee Jerk / Pendular Jerk): When eliciting the patellar tendon reflex with legs dangling, the leg extends and remains elevated / suspended briefly (or oscillates back and forth like a pendulum) due to underlying hypotonia and concurrent choreic contraction of quadriceps.
- Darting Movements / Musical Speech: Speech is explosive, hesitant, and irregular in cadence and volume.
Systemic Examination: Central Nervous System
1. Motor System Examination
- Bulk: Normal, no wasting.
- Tone: Generalized Hypotonia (joints show excessive flappability and hypermobility).
- Power: True muscle power is preserved (Grade 5/5), but motor execution is disrupted by choreic intrusions.
- Reflexes: Deep tendon reflexes are normal or show Pendular / Hung-up Knee Jerks; Plantars are flexor bilaterally.
- Gait: Choreic / Dance-like Gait: Unsteady, dancing, lurching gait with frequent postural adjustments.
2. Cardiovascular Examination (Crucial for Rheumatic Carditis)
- Auscultate the apex with diaphragm and bell in the left lateral position for the apical pansystolic murmur of Mitral Regurgitation $\pm$ mid-diastolic Carey Coombs murmur.
Final Summary & Diagnosis
"On examination of this Age in years old Male / Female child who is conscious and emotionally labile, physical examination reveals classical choreiform hyperkinesia with positive Pronator sign, Choreic dish hand, Milkmaid's grip, Chameleon tongue, and Hung-up knee jerks, with generalized hypotonia and dance-like gait, with normal sensory and cranial nerve functions, and Presence / Absence of an apical pansystolic murmur of mitral regurgitation.
Final Diagnosis: I formulate my diagnosis as a case of Acute Rheumatic Fever (Major Manifestation), clinically presenting as Sydenham's Chorea (Rheumatic Chorea / St. Vitus' Dance), with No / Mild Rheumatic Carditis (Mitral Regurgitation), and No features suggestive of Systemic Lupus Erythematosus or Wilson disease."