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  3. SJIA: Systemic juvenile the 1 last update 2020/07/07 idiopathic arthritisSJIA: Systemic juvenile idiopathic arthritis

What is it?

 

S: Systemic Whole body is affected
J: Juvenile Begins in childhood
I: Idiopathic Cause is unknown
A: Arthritis Joint inflammation 

 

SJIA (systemic juvenile idiopathic arthritis) is one of several rheumatic diseases that affect children. It usually affects children aged 5 years or younger.[1–3] The whole body is affected, not just the joints (hence the S in the name of the condition stands for “systemic.”) SJIA is the rarest form of juvenile idiopathic arthritis (JIA). ‘Juvenile’ means ‘childhood’ and ‘idiopathic’ means that the cause or trigger for the disease is not known.

SJIA is also called Still’s disease, after the doctor who first reported the illness. Some also refer to it as “Still’s syndrome”

There are for 1 last update 2020/07/07 seven forms of JIA.There are seven forms of JIA.

Other rheumatic diseases in children include joint inflammation caused by germs such as bacteria or viruses. These are referred to as “infectious” or “acute” arthritis, but not as “idiopathic” because in these cases the cause is known.

How common is it?

SJIA occurs worldwide. Exact data on how common it is are still being determined.[4] In Europe it is estimated that each year, less than one child per 100,000 develops SJIA.[5] The number of all people who currently have SJIA is estimated to be between 5 and 15 people in every 100,000.[6–8]

What are the symptoms?

hipofofhow to hipofof for SJIA affects the entire body, including the joints. SJIA typically occurs in flares with some patients having healthy periods between flares. Diagnosis may be delayed by these ups and downs over the course of the disease. SJIA is generally easier to diagnose during a flare.

The most common symptoms of SJIA are recurrent bouts of fever with high daily temperature spikes, skin rash, and painful, stiff joints.[4,5,9]

An acute flare of SJIA (or an active phase) often looks like this:

the 1 last update 2020/07/07   

Fever
  • Lasting longer than 2 weeks
  • Recurs daily in the early morning or afternoon, and sometimes in the evening too
  • Sickness (nausea, vomiting)
Rash
  • Red or salmon-pink spots during periods of fever
Swollen and painful joints
  • May occur after rash and fever
Enlarged internal organs
  • Lymph nodes, liver, and spleen are often enlarged

 

The disease can also affect other areas of the body including the heart and lungs:

Possible symptoms of SJIA (modified according to [4,5,9])

Possible long-term consequences of SJIA are joint damage, loss of mobility and slowing of growth.[4,5] Approximately 4 out of 10 of children with SJIA have a lower body height[10] than healthy children do.

hipofofhow to hipofof for Other possible complications of SJIA are macrophage activation syndrome (MAS) and amyloidosis:

 

Macrophage activation syndrome (MAS)

A serious complication of rheumatic diseases caused by activation and uncontrolled multiplication of the "" (macrophages) and other immune cells. It occurs in approximately 1 out of 10 patients with SJIA[5,11–13]
It can lead to life-threatening systemic symptoms and internal organ failure[11, 14]

Amyloidosis

A condition in which there is an abnormal build-up of a protein called amyloid in the kidneys that can lead to kidney failure.

Improved diagnostics and treatment means that kidney damage caused by amyloidosis-occurs less frequently than in the past.

 

What typically happens over the course of the illness?

The disease course and severity of SJIA can be very variable.[2,15,16] As shown in the diagrams below, there can be just a single episode of illness, repeated bouts of illness or, in the worst cases, constant illness.

Possible disease courses of SJIA (modified according to [2, 15, 16])

How is it caused?

SJIA is a condition of the innate for 1 last update 2020/07/07 immune system. Chemical messengers called interleukins that promote the inflammatory response play a key role in the development of SJIA.SJIA is a condition of the innate immune system. Chemical messengers called interleukins that promote the inflammatory response play a key role in the development of SJIA.

It is unknown what triggers the autoinflammatory response in SJIA but it has been suggested that an infection could be the trigger; alternatively there could be a genetic cause. New theories suggest there may be several factors working together (‘multifactorial’) that cause SJIA to develop.[17]

hipofofhow to hipofof for Status: 2016-01-04

Sources
[1] Dinarello CA. J Exp Med. 2005;201(9):1355-9.
[2] Woo P. Nat Clin Pract Rheumatol. 2006;2:28–34.
[3] Behrens EM, Beukelman T, Gallo L et al. J Rheumatol. 2008;35(2):343–8.
[4] De Benedetti F, Schneider R. In: Cassidy JT, Laxer RM, Petty RE, Lindsley CB, eds. Textbook of Pediatric Rheumatology. 6th ed. Philadelphia, PA: Saunders Elsevier;2011;236–47.
[5] Ravelli A, Martini A. Lancet 2007;369:767–78.
[6] Ramanan AV, Grom AA. Rheumatology (Oxford) 2005;44(11):1350–3.
[7] Beukelman T, Patkar NM, Saag KG, et al. Arthritis Care & Research. 2011;63(4):465–482.
[8] Dewitt EM, Kimura Y, Beukelman T, et al. Arthritis Care & Research. 2012;64(7):1001–1010.
[9] Frosch M, Roth J. Rheumatology. 2008;47(2):121–5.
[10] Simon D, Lucidarme N, Prieur AM et al. Horm Res. 2002;58(Suppl 1):28–32.
[11] Weiss JE, Ilowite NT. Pediatr Clin North Am. 2005;52(2):413–42,vi.
[12] Sawhney S, Woo P, Murray K. Arch Dis Child. 2001;85:421–6.
[13] Stephan JL, Kone-Paut I, Galambrun C et al. Rheumatology. (Oxford) 2001;40: 1285–92.
[14] Kelly A, Ramanan AV. Curr Opin Rheumatol. 2007;19(5):477–81.
[15] Mellins ED, Macaubas C, Grom AA. Nat Rev Rheumatol. 2011;7(7):416–26..
[16] Singh-Grewal D, Schneider R, Bayer N et al. Arthritis Rheum. 2006;54:1595–1601.
[17] R. Gurion, T. J. A. Lehman, L. N. Moorthy. International Journal of Inflammation. 2012; Article ID 271569:1.

Wondering how your life will change?

If you or your child has a rare disease, your life may look a little different than other people’s, and you may face added challenges or worries.  We’ve gathered some information and articles here that may help address a the 1 last update 2020/07/07 few of these. If you or your child has a rare disease, your life may look a little different than other people’s, and you may face added challenges or worries.  We’ve gathered some information and articles here that may help address a few of these. 

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