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EXOGENOUS ALLERGIC ALVEOLITES

Exogenous allergic alveolitis (synonym: hypersensitive pneumonitis, interstitial granulomatous alveolitis) is a group of diseases caused by intensive and, more rarely, prolonged inhalation of antigens of organic and inorganic dusts and are characterized by diffuse, in contrast to pulmonary eosinophilia, lesions of the alveolar and interstitial structures of the lungs. The emergence of this group of diseases is associated with the development of immunocomplex (type III) and cell-mediated (type IV) allergic reactions.



Atonic IgE-dependent mechanisms are not characteristic of allergic alveolitis. The inflammatory process is localized in the alveoli and interstitium of the lungs, and not in the airways, as in bronchial asthma, although the latter can be a concomitant disease in patients with alveolitis.



Etiological factors that can cause exogenous allergic alveolitis can be divided into 3 groups:



1) microorganisms (bacteria, fungi, protozoa and their metabolic products (proteins, enzymes, endotoxins, etc.));



2) organic matter of animal and vegetable origin (animal hair, feather of birds, rice dust, etc.);



3) low molecular weight compounds (diisocyanite, salts of heavy metals, including gold), medical preparations (intal, antibiotics, nitrofurans, antimycotic drugs, antimetabolites). For the occurrence of alveolitis, several conditions are necessary:



1) inhalation route of antigen penetration (diameter of dust particles no more than 5 microns);



2) high concentrations of antigen in the inhaled air and significant exposure;



3) the antigen should be presented in a corpuscular form (cells) or in the form of an aggregated protein; soluble antigens do not cause the development of alveolitis;



4) the antigen must have the ability to activate the complement system in an alternative way, i.e. without antibodies.



Pathomorphologically allergic alveolitis is characterized by damage to the alveolar and endothelial cells, vasculitis, mononuclear, and / or polynuclear infiltration of the interstitial tissue and alveolar structures of the lungs, the formation of sarcoid-like granulomas, interstitial fibrosis.



The name of the disease most often reflects an etiological factor:



“Lung of flour mills”, “lung of cheese makers”, “lung of poultry farmers”, etc.



During the disease, acute, subacute and chronic stages (forms) are distinguished.



The acute form develops 4-12 hours after the patient contacts the allergen. There is a flu-like syndrome: chills, fever, cough, shortness of breath, nausea, myalgia, arthralgia. Other acute forms are pneumonia-like (crepitus and wet rales during auscultation, interstitial infiltrates during radiography) and bronchotic (dry cough, "diffuse wheezing in the lungs) syndromes.
Neutrophilic leukocytosis is observed in the blood. When examining the function of external respiration, a mixed type of respiratory failure (obstructive and restrictive) is revealed. Radiologically, reticular or modular (diameter 0.1-1 cm) infiltrative shadows can be detected:



changes in the type of "frosted glass", indistinguishability of the vascular pattern.



The acute form may have a progressive course with severe



prognosis, however, more often, suspension due to illness from work or hospitalization leads to an improvement in the condition. The diagnosis of an acute form of exogenous alveolitis is rare, usually diagnosed with influenza, acute respiratory viral infections, acute pneumonia or bronchitis.



The subacute form develops with continued contact with the antigen. In these cases, the “Monday phenomenon” is typical:



acute manifestations are observed in the days after rest, and subside by the end of the working week.



The chronic form of exogenous allergic alveolitis is observed with long-term contact with the allergen and the long course of the disease. Pathologically, this form is based on interstitial fibrosis ("fibrosing alveolitis"), so the clinical manifestations of the disease are similar to the clinic of idiopathic fibrosing alveolitis (Hammen-Rich disease). Patients with respiratory failure progressing, accompanied by asthenic syndrome, anorexia, weight loss. Pulmonary heart develops with appropriate symptoms. An X-ray examination reveals signs of pulmonary fibrosis: diffuse mesh, modular and linear shadows, symptoms of freezing of the lung, picture of the “cell lung”. In the study of HPF, a restrictive type of respiratory failure is recorded.







DIAGNOSTICS of exogenous allergic alveolitis is carried out on the basis of an assessment of the clinic of the disease, a thorough history, instrumental methods and immunological examination. For - identification of specific antibodies, precipitation reactions, passive hemagglutination, and enzyme immunoassay are used. Diagnostic significance is given to the pagopental reaction of blast transformation of lymphocytes and inhibition of leukocyte migration with a specific antigen.



Intracutaneous tests with a dilution of allergen 1:10 have not lost their significance. Sometimes a lung biopsy is required.



The differential diagnosis is carried out in the acute stage with acute respiratory viral infections, influenza, acute pneumonia, acute bronchitis. In the chronic stage, the disease is differentiated from idiopathic fibrosing alveolitis and granulomatous processes in the lungs (tuberculosis, sarcoidosis, Wegener's granulomatosis, etc.) -
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EXOGENOUS ALLERGIC ALVEOLITES

  1. Exogenous Allergic Alveolitis
    This is a group of diseases caused by inhalation of organic dust, which occur with diffuse granulomatous lesions of the interstitial lung tissue. Unlike other granulomatous lung lesions, such as sarcoidosis and coccidiomycosis, there are no systemic manifestations of exogenous allergic alveolitis. Inhalation of organic dust leads to the development of exogenous allergic
  2. Allergic rhinitis, allergic conjunctivitis, urticaria, Quincke edema
    Acute allergic diseases are caused by increased sensitivity of the immune system to various exogenous antigens (allergens). They are characterized by a sudden onset, an unpredictable course, a high risk of developing life-threatening conditions. ETIOLOGY AND PATHOGENESIS The most common allergens: ¦ food (fish, seafood, nuts, honey, milk, eggs, fruits, legumes, etc.); ¦
  3. Allergic diseases of the paranasal sinuses (allergic sinusitis)
    Acute and chronic allergic diseases of the paranasal sinuses represent a special category of pathological conditions of the mucous membrane of the upper respiratory tract resulting from an increased sensitivity of the patient's body to a foreign protein (antigen or allergen) and due to neurogenic and endocrine disorders. In the pathology of the disease a large role belongs
  4. Exogenous hyperthermia.
    Exogenous hyperthermia occurs with a significant increase in the influx of heat from the external environment: in hot climates, hot shops, with an artificial increase in air temperature in the bath, etc. Exogenous hyperthermia can also be caused by factors that hinder heat transfer - moisture-proof heat-insulating clothing, high humidity, and insufficient ventilation. Fastest exogenous
  5. Exogenous Steroid Cancellation Syndrome
    Appearance reminiscent of a patient with Cushing's syndrome should always be an indication for the use of exogenous corticosteroids and the suppression of pituitary-adrenal connections. Adrenal insufficiency as a result of exogenous steroid therapy is a surprisingly rare occurrence, given the frequency with which corticosteroids are used. The likelihood of developing failure
  6. Exogenous neurointoxication. GENERAL CHARACTERISTICS
    Exogenous neurointoxications are called persistent or transient dysfunctions of the nervous system resulting from exposure to toxic chemicals on the body. Exogenous neurointoxications that develop as a result of exposure to the body of industrial poisons under the condition of insufficient compliance with sanitary-hygienic and sanitary-technical requirements are called
  7. Exogenous poisoning syndrome
    Poisoning (intoxication, acute overdose) - pathological conditions caused by the action of toxic substances of exogenous origin in any way they enter the body. The severity of the patient's condition in case of poisoning depends on the dose of the poison, the route of its entry, exposure time, premorbid state (bleeding, hypoxia, acute cardiovascular failure, etc.).
  8. ALLERGIC LUNG DISEASES
    In recent decades, a significant increase in the number. patients with allergic diseases of the bronchopulmonary apparatus. Allergic lung diseases include exogenous allergic alveolitis, pulmonary eosinophilia, and drug
  9. EMERGENCY STATES OF EXOGENOUS GENESIS
    EMERGENCY STATES OF EXOGENOUS
  10. EMERGENCY CONDITIONS UNDER EXOGENEOUS PHYSICAL INFLUENCES
    EMERGENCY CONDITIONS AT EXOGENOUS PHYSICAL
  11. Resuscitation and intensive care for acute exogenous poisoning.
    Lecture 6 of OEO is a pathological process that occurs as a result of the ingestion of various toxic substances from the external environment into the body that cause disturbances in homeostasis. A toxic substance is poison that enters from the outside. O.'s severity depends on the dose, concentration, excretion rate and ways of penetration of toxic substances into the body. Toxic substances may
  12. The immune system protects the internal environment of the body from exogenous and endogenous antigens
    The immune system protects the internal environment of the body from exogenous and endogenous
  13. Diseases caused by malnutrition: caries, rickets, exogenously-congregational obesity, hypo- and vitamin deficiencies, their prevention
    Violations of sanitary standards for the storage and distribution of ready meals can lead to massive gastrointestinal diseases and food poisoning. Poisoning: * Chemical - resulting from poisonous products (mushrooms, fish and shellfish, weed seeds) * Bacteriological - arise from the use of infected products (meat, fish, dairy products). The most dangerous
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