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Henoch–Schönlein purpura is a small-vessel vasculitis in which complexes of immunoglobulin A (IgA) and complement component 3 (C3) are deposited on arterioles, capillaries, and venules (hence it is a type III hypersensitivity reaction).
[3] An example of complement dependent type II hypersensitivity is an acute hemolytic transfusion reaction following transfusion of ABO incompatible blood. [4] Preformed antibody (predominantly IgM) against donor red cell antigens not found in an individual of a particular blood group (e.g. anti-A IgM in an individual with blood group B), bind to the donor red cell surface and lead to rapid ...
Golfer's vasculitis, also called exercise-induced vasculitis, sport-induced vasculitis, Disney rash, or hiker's rash, is a form of small blood vessel inflammation resulting in a rash. [1] It occurs in the lower legs, and is caused by excessive walking in hot temperatures. It is more common in elderly people.
A lot of people with allergic reactions experience mild symptoms, like hives, eczema, allergic rhinitis—which is inflammation of the nose, as well as asthma. Certain people though, when exposed to a large load of specific allergens, like bee stings, seafood, or peanuts, can have a really severe and potentially life threatening allergic reaction.
Type III hypersensitivity, in the Gell and Coombs classification of allergic reactions, occurs when there is accumulation of immune complexes (antigen-antibody complexes) that have not been adequately cleared by innate immune cells, giving rise to an inflammatory response and attraction of leukocytes.
They drain the posterior compartment of the leg and the plantar surface of the foot to the popliteal vein, which it forms when it joins with the anterior tibial vein. [1] The posterior tibial vein is accompanied by an homonym artery, the posterior tibial artery, along its course. [2] It lies posterior to the medial malleolus in the ankle. [2]
(Hemodynamics is the study of blood flow and of the laws that govern the circulation of blood in the blood vessels.) [5] It follows that the examiner's knowledge of venous hemodynamics is crucial, which can be a real barrier to a radiologist, untrained in this field, who might wish to carry out these examinations.
Arthus reactions (type III hypersensitivity reactions) are rarely reported after vaccination and can occur after tetanus toxoid–containing or diphtheria toxoid–containing vaccines. An Arthus reaction is a local vasculitis associated with deposition of immune complexes and activation of complement.