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IgG4-related disease (IgG4-RD), formerly known as IgG4-related systemic disease, is a chronic inflammatory condition characterized by tissue infiltration with lymphocytes and IgG4-secreting plasma cells, various degrees of fibrosis (scarring) and a usually prompt response to oral steroids.
IgG4-related autoimmune diseases are characterized by excessive fibrosis. In case of Riedel's thyroiditis, fibrosis extends beyond the capsule and involves contiguous neck structures, clinically simulating thyroid carcinoma. There is a rapid thyroid enlargement. Compression of trachea, dysphagia are probable outcomes.
All patients with IgG deficiency require extensive diagnostic evaluation before the patient is diagnosed with a clinically significant IgG subclass deficiency. Depending on a clinical presentation, complete blood count , test for total serum immunoglobulins (IgG, IgA, IgM and subclass levels of IgG) and other tests are performed.
The water-accessible surface area of an IgG antibody. Immunoglobulin G (IgG) is a type of antibody.Representing approximately 75% of serum antibodies in humans, IgG is the most common type of antibody found in blood circulation. [1]
IgG4-related ophthalmic disease (IgG4-ROD) is the recommended term to describe orbital (eye socket) manifestations of the systemic condition IgG4-related disease, [2] which is characterised by infiltration of lymphocytes and plasma cells and subsequent fibrosis in involved structures. It can involve one or more of the orbital structures.
Although a clear understanding of the various skin lesions in IgG4-related disease is a work in progress, skin lesions have been classified into subtypes based on documented cases: [2] Angiolymphoid hyperplasia with eosinophilia (or lesions that mimic it) [3] and cutaneous pseudolymphoma; Cutaneous plasmacytosis [Note 1]
Patients should closely monitor their sugar levels to ensure that they reduce rather than continue to remain high. High blood sugar levels are not as easy to detect as hypoglycemia and usually happens over a period of days rather than hours or minutes. If left untreated, this can result in diabetic coma and death.
The most common antibody isotype involved in warm antibody AIHA is IgG, though sometimes IgA is found. The IgG antibodies attach to a red blood cell, leaving their F C portion exposed with maximal reactivity at 37 °C (versus cold antibody induced hemolytic anemia whose antibodies only bind red blood cells at low body temperatures, typically 28–31 °C).