Напишите сочинение по теми алергия 7-8 предложений срочно!!!!!!!!!! пожалуста

+ 0 -

Lana199926

29 мая 2013 г., 5:50:14 (10 лет назад)

Under allergy allergic reactions in clinical practice understand manifestations, which is the basis of immunological conflict . In the diagnosis of allergic reactions is important to identify the allergen , its causal relationship with clinical manifestations and type of immunological reaction . There is a common pathogenetic principle of allocating four types of allergic reactions. Types of allergic reactions first three types occur acutely and therefore more in need of urgent events. In the first type based on the reaction mechanism is reaginic tissue damage flowing generally involving IgE, less often class IgG, surface membrane of basophils and mast cells. In the blood released a number of biologically active substances, histamine, serotonin , bradykinin , heparin, slow reacting substance of anaphylaxis, leukotrienes, etc. , that lead to a breach of the permeability of cell membranes , interstitial edema , smooth muscle spasm , increased secretion . Typical clinical examples of the first type of allergic reaction is anaphylactic shock , bronchial asthma , urticaria, false croup , vasomotor rhinitis . The second type of allergic reaction, cytotoxic , proceeding with the assistance of immunoglobulins G and M, as well as activation of the complement system , resulting in damage to the cell membrane. This type of allergic reaction is observed in the development of drug allergy leukopenia, thrombocytopenia , hemolytic anemia , as well as hemolysis during blood transfusions , hemolytic disease of the newborn with Rh conflict. The third type of allergic reaction (as slime Arthus ) is associated with tissue damage immune complexes circulating in the bloodstream , proceeds with participation of immunoglobulin classes C and M. The damaging effect of immune complexes on tissue occurs through the activation of complement and lysosomal enzymes . This type of reaction develops with exogenous allergic alveolitis , glomerulonephritis , allergic dermatitis , serum sickness , certain types of drug and food allergies , rheumatoid arthritis, systemic lupus erythematosus , etc. The fourth type of allergic reaction ' tuberculin , slow ' occurs 24-48 hours , flows with sensitized lymphocytes. Typical for infectious- allergic bronchial asthma , tuberculosis, brucellosis and other diseases .