Juvenile idiopathic arthritis

Question 1

What is juvenile idiopathic arthritis?

Answer 1

group of conditions encompassing all forms of arthritis of unknown etiology lasting for at least 6 weeks and with an onset before 16 years of age

Question 2

how do you diagnose juvenile psoriatic arthritis?

Answer 2

arthritis + typical psoriatic rash

or

when the rash is missing...
arthritis + any 2 of the following:
1. family history of psoriasis in a first degree relative
2.dactylitis
3.nail pitting or onycholysis

Question 3

how do you diagnose the multisystemic form of JIA?

Answer 3

arthritis + accompanied or preceded by a documented quotidian fever of at least 2 weeks duration + at least 1 of the following

1. characteristic rash
2. generalized symmetrical lymphadenopathy
3. enlargement of liver or spleen
4. serositis (pericarditis, pleural or pericardial effusion, rarely peritonitis)

Question 4

How do you describe the fever in JIA?

Answer 4

has a typical intermittent pattern, with 1 or 2 daily spikes, up to 39 C or higher, followed by a rapid return to baseline

Question 5

How do you describe the rash in SJIA?

Answer 5

The erythematous, salmon pink, evanescent macular rash usually appears with the fever

• classic sJIA eruption: transient salmon pink mostly macular eruption

Question 6

Arthritis is often symmetrical in Sjia (juvenile still syndrome)

Answer 6

and polyarticular, but may be absent at onset and develop much later
Diagnosis cannot be considered definite until arthritis is present