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group_2_presentation_2_-_juvenile_arthritis [2017/03/03 20:09] ramachg |
group_2_presentation_2_-_juvenile_arthritis [2018/01/25 15:18] (current) |
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| Systemic juvenile idiopathic arthritis causes inflammation in one or more joints, and its symptoms include high daily fevers that can last up to two weeks either preceding or accompanying the arthritis. A skin rash or enlargement of lymph nodes, liver or spleen are symptoms that differentiate this type of juvenile arthritis from other types (Genetics Home Reference, 2015). | Systemic juvenile idiopathic arthritis causes inflammation in one or more joints, and its symptoms include high daily fevers that can last up to two weeks either preceding or accompanying the arthritis. A skin rash or enlargement of lymph nodes, liver or spleen are symptoms that differentiate this type of juvenile arthritis from other types (Genetics Home Reference, 2015). | ||
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| + | <box 50% round right |>{{:piechartjia2.png|{{:piechartjia.png|}}</box|Figure 2. This image shows the percentage at which each subtype of JIA is prevalent. Retrieved from: https://warmsocks.files.wordpress.com/2012/08/jiabreakdown.png> | ||
| ==== Oligoarticular JIA ==== | ==== Oligoarticular JIA ==== | ||
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| Undifferentiated arthritis is given to patients who have symptoms that are not explained by the descriptions of any of the above forms of JIA or who have fit the criteria for more than one of the given descriptions of JIA (Genetics Home Reference, 2015). | Undifferentiated arthritis is given to patients who have symptoms that are not explained by the descriptions of any of the above forms of JIA or who have fit the criteria for more than one of the given descriptions of JIA (Genetics Home Reference, 2015). | ||
| - | <box 50% round right |>{{:piechartjia2.png|{{:piechartjia.png|}}</box|Figure 2. This image shows the percentage at which each subtype of JIA is prevalent. Retrieved from: https://warmsocks.files.wordpress.com/2012/08/jiabreakdown.png> | ||
| ===== Symptoms & Diagnosis ===== | ===== Symptoms & Diagnosis ===== | ||
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| ==== Subcutaneous Nodules ==== | ==== Subcutaneous Nodules ==== | ||
| - | Nodules have been observed in approximately 10% of children who have been diagnosed with JRA and can appear subcutaneously. Characteristics of nodules include varying in sizes (from a few millimeters to several centimetres in diameter) nontender, no attachment to overlying skin and therefore move freely under the skin. Many times, they are found over the extensor tendon sheath of the hands, specifically over the metacarpophalangeal, proximal interphalangeal and distal interphalangeal joints. They are also found near the olecranon process of the elbow, over the anterior tibial surfaces and around the wrists and when fever is prevalent in the patient, nodules are found along the tendons of the erector spinae group and over the aponeurosis of the scalp (Miller, 1994). | + | Nodules have been observed in approximately 10% of children who have been diagnosed with JIA and can appear subcutaneously. Characteristics of nodules include varying in sizes (from a few millimeters to several centimetres in diameter) nontender, no attachment to overlying skin and therefore move freely under the skin. Many times, they are found over the extensor tendon sheath of the hands, specifically over the metacarpophalangeal, proximal interphalangeal and distal interphalangeal joints. They are also found near the olecranon process of the elbow, over the anterior tibial surfaces and around the wrists and when fever is prevalent in the patient, nodules are found along the tendons of the erector spinae group and over the aponeurosis of the scalp (Miller, 1994). |
| ==== Uveitis Eye condition ==== | ==== Uveitis Eye condition ==== | ||
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| ===== Causes and Risk Factors ===== | ===== Causes and Risk Factors ===== | ||
| - | It has been determined that most cases of JRA are sporadic, meaning that they occur in patients who don’t necessarily have a history of the disorder in their family (Genetics Home Reference, 2015). With that being said, there are many causes that occur prior to the diagnosis of JRA that have been mentioned to potentially lead to or affect the prevalence of JRA. Infectious agents, immunologic abnormalities of the host, physical trauma to joints, psychological trauma to the child, and allergy or reactions to drugs, foods, or toxins can all potentially lead to an individual to JRA (Schaller, 1997). Keeping in mind that there is no clear evidence that proves these are leadings causes of JRA (Schaller, 1997). JRA is not considered to be a familial disease, except in the place in which there is an onset of pauciarticular arthritis (Schaller, 1997). Also, there has been no evidence showing that JRA is transmissible. Various kinds of JRA have been shown to differ in sex, age, types of complications and prognosis, however, epidemiologic studies have not be able to clarify these observations (Schaller, 1997). A small percentage of cases of JRA have shown to have run in the family, however the inheritance pattern of the conditions is unclear (Genetics Home Reference, 2015). | + | It has been determined that most cases of JIA are sporadic, meaning that they occur in patients who don’t necessarily have a history of the disorder in their family (Genetics Home Reference, 2015). With that being said, there are many causes that occur prior to the diagnosis of JIA that have been mentioned to potentially lead to or affect the prevalence of JIA. Infectious agents, immunologic abnormalities of the host, physical trauma to joints, psychological trauma to the child, and allergy or reactions to drugs, foods, or toxins can all potentially lead to an individual to JIA (Schaller, 1997). Keeping in mind that there is no clear evidence that proves these are leadings causes of JIA (Schaller, 1997). JIA is not considered to be a familial disease, except in the place in which there is an onset of pauciarticular arthritis (Schaller, 1997). Also, there has been no evidence showing that JIA is transmissible. Various kinds of JIA have been shown to differ in sex, age, types of complications and prognosis, however, epidemiologic studies have not be able to clarify these observations (Schaller, 1997). A small percentage of cases of JIA have shown to have run in the family, however the inheritance pattern of the conditions is unclear (Genetics Home Reference, 2015). |
| - | Maternal smoking has also been observed to potentially cause or play a role in the onset of JRA through various ways (Symmons, 2005). Firstly, a mother who smokes while pregnant can induce some permanent immunological abnormality in the child which can later lead to arthritis (Symmons, 2005). Smoking while pregnant could also cause a low birth weight which could in turn lead to an increase in the susceptibility to infection and later, JRA (Symmons, 2005). Lastly, the continual smoking, even after a baby is born may lead to a contaminated environment which could ultimately lead to the onset of JRA later on during the early years of that child’s life (Symmons, 2005). | + | Maternal smoking has also been observed to potentially cause or play a role in the onset of JIA through various ways (Symmons, 2005). Firstly, a mother who smokes while pregnant can induce some permanent immunological abnormality in the child which can later lead to arthritis (Symmons, 2005). Smoking while pregnant could also cause a low birth weight which could in turn lead to an increase in the susceptibility to infection and later, JIA (Symmons, 2005). Lastly, the continual smoking, even after a baby is born may lead to a contaminated environment which could ultimately lead to the onset of JIA later on during the early years of that child’s life (Symmons, 2005). |
| {{:causes_and_risk.png|{{:weight_status_category.png|}} | {{:causes_and_risk.png|{{:weight_status_category.png|}} | ||
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| ===== Epidemiology ===== | ===== Epidemiology ===== | ||
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| - | The incidence of JIA in North America and Europe is 4 - 16 affected children out of a sub-population of 10000 children. 1 in 1000, or approximately 294000 children in the United States, are affected by the most common type of JIA in the United States, which is oligoarticular JIA. For reasons that continue to be studied, females seem to be affected with JIA more frequently than males. In the case of enthesitis-related JIA, males are affected more often than females. Furthermore, the incidence of JIA varies between different populations and ethnic groups (Genetics Home Reference, 2015). | ||
| <sup>[1]</sup> | <sup>[1]</sup> | ||
| - | <box 70% round right |>{{:prev.png|{{:epi_world_map.png|}}</box| | + | <box 60% round right |>{{:prev.png|{{:epi_world_map.png|}}</box| |
| Figure 4.This image is showing the prevalence of the common forms of arthritis in the United States. Retrieved from: https://rheumatoidarthritis.net/wp-content/uploads/2013/07/prevalence_arthritis.png> | Figure 4.This image is showing the prevalence of the common forms of arthritis in the United States. Retrieved from: https://rheumatoidarthritis.net/wp-content/uploads/2013/07/prevalence_arthritis.png> | ||
| - | In a study done by Saurenmann et al, questionnaires pertaining to ethnicity were distributed to patients with JRA and then followed up at the Hospital for Sick Children in Toronto. When the data was collected, the relative risk of developing JRA was calculated and the results were compared with data from the age matched general population in the Toronto region. The frequency at which JRA has been perceived shows that European descendants had about 69.7% of their patients diagnosed with JRA, which patients in the Toronto region has about 54.7%. Statistically lower percentages were shown to patients who were of the black, Asian, or Indian subcontinental origin. Kids from the European origin had a higher relative rate for developing any of the subtypes of juvenile arthritis, except oligoarthritis or psoriatic. Patients of the Asian origin showed to have a greater chance of being diagnosed with enthesitis-related JIA while those of black or Native North American origin were more likely to develop polyarticular rheumatoid positive JIA (Saurenmann, 2007). | + | The incidence of JIA in North America and Europe is 4 - 16 affected children out of a sub-population of 10000 children. 1 in 1000, or approximately 294000 children in the United States, are affected by the most common type of JIA in the United States, which is oligoarticular JIA. For reasons that continue to be studied, females seem to be affected with JIA more frequently than males. In the case of enthesitis-related JIA, males are affected more often than females. Furthermore, the incidence of JIA varies between different populations and ethnic groups (Genetics Home Reference, 2015). |
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| + | In a study done by Saurenmann et al, questionnaires pertaining to ethnicity were distributed to patients with JIA and then followed up at the Hospital for Sick Children in Toronto. When the data was collected, the relative risk of developing JIA was calculated and the results were compared with data from the age matched general population in the Toronto region. The frequency at which JIA has been perceived shows that European descendants had about 69.7% of their patients diagnosed with JIA, which patients in the Toronto region has about 54.7%. Statistically lower percentages were shown to patients who were of the black, Asian, or Indian subcontinental origin. Kids from the European origin had a higher relative rate for developing any of the subtypes of juvenile arthritis, except oligoarthritis or psoriatic. Patients of the Asian origin showed to have a greater chance of being diagnosed with enthesitis-related JIA while those of black or Native North American origin were more likely to develop polyarticular rheumatoid positive JIA (Saurenmann, 2007). | ||
| ===== Pathophysiology ===== | ===== Pathophysiology ===== | ||
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| Cytokines are protein messengers that transmit signals from one cell to another by binding to specific receptors on the surface of cells. Both pro- and anti-inflammatory cytokines, chemokines, and mitogenic factors are produced, but proinflammatory mediators predominate during the active phase of disease.Tumor necrosis factor alpha (TNFα), IL-1, IL-6 and IL-17 are of key importance in the pathogenesis of inflammation in RA. IL-1 and TNFα are also key players in the regulation of mediators of connective tissue damage by synoviocytes, including matrix metalloproteinases (MMPs) and prostaglandins (Nath Maini, 2010). | Cytokines are protein messengers that transmit signals from one cell to another by binding to specific receptors on the surface of cells. Both pro- and anti-inflammatory cytokines, chemokines, and mitogenic factors are produced, but proinflammatory mediators predominate during the active phase of disease.Tumor necrosis factor alpha (TNFα), IL-1, IL-6 and IL-17 are of key importance in the pathogenesis of inflammation in RA. IL-1 and TNFα are also key players in the regulation of mediators of connective tissue damage by synoviocytes, including matrix metalloproteinases (MMPs) and prostaglandins (Nath Maini, 2010). | ||
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| + | <box 60% round right |>{{:p4.png|}}</box|Figure 8: Summary of the pathogenic pathways in JIA. Retrived from: https://www.researchgate.net/profile/Abdullah_Nahian/publication/263585727/figure/fig1/AS:202832654409738@1425370481906/Figure-illustrates-the-pathogenic-pathways-of-rheumatoid-arthritis-following-31-38.png> | ||
| ACPAs may also bind to citrullinated proteins directly in the synovial membrane. Immune complexes between citrullinated proteins ,such as fibrinogen, and ACPA-igG can drive inflammation (including the production of IL-6 and tumor necrosis factor) by engaging both toll-like receptor (TLR4) and Fc receptors (Nath Maini, 2010). | ACPAs may also bind to citrullinated proteins directly in the synovial membrane. Immune complexes between citrullinated proteins ,such as fibrinogen, and ACPA-igG can drive inflammation (including the production of IL-6 and tumor necrosis factor) by engaging both toll-like receptor (TLR4) and Fc receptors (Nath Maini, 2010). | ||
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| Both ACPA- and RF-dependent events could contribute to the initiation and propagation of chronic synovial inflammation, and further synergize with T cell activation and enhance the local production of autoantibodies (McInnes & Schett, 2011). | Both ACPA- and RF-dependent events could contribute to the initiation and propagation of chronic synovial inflammation, and further synergize with T cell activation and enhance the local production of autoantibodies (McInnes & Schett, 2011). | ||
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| - | <box 60% round right |>{{:p4.png|}}</box|Figure 8: Summary of the pathogenic pathways in JIA. Retrived from: https://www.researchgate.net/profile/Abdullah_Nahian/publication/263585727/figure/fig1/AS:202832654409738@1425370481906/Figure-illustrates-the-pathogenic-pathways-of-rheumatoid-arthritis-following-31-38.png> | ||
| ===Bone Destruction=== | ===Bone Destruction=== | ||
