Skin vasculitis

Vasculitis (synonym: angiitis of the skin) - skin diseases, in the clinical and pathomorphological picture of which the primary and leading link is the nonspecific inflammation of the walls of vessels of different caliber skin.

Causes of the skin vasculitis

The causes and pathogenesis of vasculitis remain unclear until the end and it is considered that the disease is polyethological. An important factor in the development is chronic infection, as well as tonsillitis, sinusitis, phlebitis, adnexitis, etc. Among the infectious agents, streptococci and staphylococci, viruses, mycobacterium tuberculosis, certain pathogenic fungi (Candida genus, Trichophyton mentagraphytes) are of great importance. At present, the theory of the immune complexion of vasculitis, which connects their occurrence with a damaging effect on the vascular walls of the immune complexes that precipitate from the blood, is becoming increasingly widespread. This is confirmed by the detection of immunoglobulins and complement in fresh lesions in patients with vasculitis. The role of the antigen can be performed by a particular microbial agent, drug substance, own altered protein. Important in the pathogenesis of vasculitis are diseases of the endocrine system, metabolic disorders, chronic intoxication, mental and physical overstrain, etc.

[1], [2], [3], [4]

Risk factors

Changes in the skin of the skin are predominantly the result of inflammatory reactions of various origins involving the vascular walls (vasculitis). Vessels of different caliber are involved in the inflammatory process: small (capillaries), medium, large muscular, muscular-elastic and elastic types. Of the numerous causative factors of vasculitis, bacterial antigens, drugs, autoantigens, food and tumor antigens are of greatest importance. Most often vasculitis develops on the basis of immune disorders in the form of hypersensitivity of immediate and delayed types and their combinations, which can cause a variety of clinical and histological patterns.

With immediate type hypersensitivity, vascular-tissue permeability is sharply expressed, as a result of which the walls of the vessels in the focus of inflammation are impregnated with proteinaceous fluid, sometimes subjected to fibrinoid changes; The infiltrate consists mainly of neutrophilic and eosinophilic granulocytes. With hypersensitivity of the delayed type, cellular-proliferative changes are on the foreground, and the immune nature of inflammation is confirmed by the presence in the vessels of the microcirculatory bed and the cytoplasm of the cells of the infiltrate of immune complexes.

Tissue reaction mostly proceeds according to the type of phenomena of Arthus and Sanarelli-Schwartzmann. In the skin of patients, immune complexes are detected, positive samples are observed for various allergens, changes in cellular and humoral immunity, as well as reactions to vascular, streptococcal antigens. Detect hypersensitivity to cocci flora, medicines, especially antibiotics, sulfonamides, analgesics. Factors contributing to the development of the allergic process in vasculitis are hypothermia, endocrine disorders (diabetes mellitus), neurotrophic disorders, pathology of internal organs (liver disease), intoxications and other effects.

[5], [6], [7], [8]

Pathogenesis

Usually the epidermis and appendages of the skin without any features. Focal lesions of small vessels, mainly capillaries, are noted; in the lumens of the affected vessels - a cluster of segmented leukocytes, the destruction of the vascular wall and cellular infiltration of the latter, as well as adjacent tissues. The infiltrate consists of segmented neutrophils, macrophages, lymphocytes and plasmocytes. In places, multiple microthrombi are clearly discernible. In more severe cases (in the presence of nodules) small arteries are affected.

[9], [10], [11], [12], [13], [14], [15]

Symptoms of the skin vasculitis

The clinical picture of vasculitis is extremely diverse. There are a number of common signs that clinically unite this polymorphic group of dermatoses:

• inflammatory nature of the changes;
• the tendency of rashes to edema, hemorrhage, necrosis;
• symmetry of defeat;
• polymorphism of morphological elements (they usually have an evolutionary character):
• preferential localization on the lower limbs;
• presence of concomitant vascular, allergic, rheumatic, autoimmune and other systemic diseases;
• the association of vasculitis with a previous infection or drug intolerance;
• acute or periodically exacerbating current.

Hemorrhagic vasculitis of Shenlaine-Genocha

Distinguish cutaneous, abdominal, articular, necrotic, fulminant forms of hemorrhagic vasculitis.

With the dermal form, the appearance of the so-called palpable purpura, a swollen hemorrhagic spot of various sizes, is found, usually located on the shins and the rear of the foot, which is easily determined not only visually, but also during palpation, which distinguishes it from other purples. The initial eruptions with hemorrhagic vasculitis are edematous inflammatory spots resembling blisters that quickly transform into a hemorrhagic rash. With the increase in inflammatory phenomena against the background of purpura and ecchymosis, hemorrhagic blisters are formed, after the opening of which deep erosions or ulcers are formed. Rashes, as a rule, are accompanied by a slight swelling of the lower extremities. In addition to the lower extremities, hemorrhagic spots can also be located on the hips, buttocks, trunk and mucous membrane of the mouth and throat.

With abdominal form, rashes on the peritoneum or mucous membrane of the intestine are noted. Skin rashes do not always precede gastrointestinal symptoms. At the same time, vomiting, cramping pains in the abdomen, tension and tenderness during palpation are observed. From the kidneys can also be noted various pathological phenomena of varying degrees: from short-term unstable microhematuria and albuminuria to a pronounced picture of diffuse kidney damage.

Joint shape is characterized by joint changes and soreness that occur before or after skin rash. There is a lesion of large (knee and ankle) joints, where there is swelling and tenderness, persisting for several weeks. The skin above the affected joint changes color and has a greenish-yellow color.

The necrotic form of vasculitis is characterized by the appearance of multiple polymorphic eruptions. At the same time with small spots, nodules and blisters filled with serous or hemorrhagic exudate, necrotic skin lesions, ulceration and hemorrhagic crusts appear. Foci of lesion are usually located on the lower third of the shin, in the region of the ankles, as well as on the rear of the feet. At the beginning of the disease, the primary element is the hemorrhagic spot. During this period, itching and burning are noted. Then the stain quickly increases in size and is exposed to the surface by wet necrosis. Necrotic ulcers can have a different size and depth, reaching even the periosteum. Such ulcers proceed for a long time and turn into trophic ulcers. Subjectively, patients complain of pain.

Forms

There is no generally accepted classification of allergic vasculitis. According to the classification of ST. Pavlova and OK Shaposhnikova (1974), skin vasculitis according to the depth of the vascular lesions are divided into superficial and deep. In superficial vasculitis, the superficial vasculature of the skin is affected mainly (allergic vasculitis of Ruiter's skin, hemorrhagic vasculitis of Shenlaine-Genocha, hemorrhagic microbe of Mischer-Storck, nodular necrotic vasculitis of Werther-Dumpling, disseminated allergic angiitis of Roscam).

To deep vasculitis include cutaneous nodular periarteritis, acute and chronic erythema nodosum. The latter includes nodular vasculitis Montgomery-O'Leary-Barker, migratory erythema nodosum of Bethverstedt and subacute migrating hypodermis of Vilanova-Pinolea.

NOT. Yarygin (1980) divides allergic vasculitis into two main groups: acute and chronic, progressive. In the first group, the author includes allergic vasculitis with reversible immune disorders that occur more often only once, but recurrences without progression are possible (infectious, drug allergic and hypersensitivity to trophoallergens). The second group is characterized by a chronic recurrent course with progression of the process, which is based on difficultly reversible or irreversible immune disorders. These include allergic vasculitis in collagen diseases (rheumatism, rheumatoid arthritis, systemic lupus erythematosus, systemic scleroderma), systemic vasculitis, or vasculitis with immune disorders (nodular periarteritis, Wegener's granulomatosis, Buerger's disease, Shenlein-Henoch disease, etc.).

The classification of vasculitis WM Sams (1986) is based on the pathogenetic principle. The author identifies the following groups:

1. leukocytoclastic vasculitis, which includes leukocytoclastic vasculitis; urticaroid (hypocomplexemic) vasculitis, essential mixed cryoglobulinemia; Hypergammaglobulinemic purpura of Waldenstrom; erythema persistent exalted and presumably special types - exudative erythema multiforme and lichenoid parapsoriasis;
2. Rheumatic vasculitis, developing with systemic lupus erythematosus, rheumatoid arthritis, dermatomyositis;
3. granulomatous vasculitis in the form of allergic granulomatous angiitis, face granuloma, Wegener's granulomatosis, granuloma annular, lipoid necrobiosis, rheumatic nodules;
4. nodular periarteritis (classic and cutaneous types);
5. giant cell arteritis (temporal arteritis, rheumatic polymyalgia, Takayasu disease).

Far from always observable in patients manifestations of the pathological process correspond to one or another variant of cutaneous vasculitis related to a specific nosological unit. This is due to the fact that at different stages of the disease the clinical picture can change, symptoms appear that are characteristic of another form. In addition, the clinical picture depends on the individual reactions of the patient. In this regard, we believe that the isolation of individual nosological forms of allergic vasculitis is mostly conditional. In addition, this is confirmed by the fact that the pathogenesis of individual forms of allergic vasculitis and its morphological manifestations are very similar. Some authors for the allergic skin vasculitis introduced the term necrotizing vasculitis.

Currently, there are several dozens of dermatoses belonging to the skin vasculitis group. Most of them have a clinical and morphological similarity. In this regard, there is no single clinical or pathomorphological classification of skin vasculitis.

Classification of vasculitis. Most dermatologists, depending on the depth of the lesion, skin vasculitis are divided into the following clinical forms:

• dermal vasculitis (polymorphic dermal and icicle, purple pigmentary chronic);
• dermo-hypodermal vasculitis (levido-angiitis);
• hypodermal vasculitis (knotty vasculitis).

These clinical forms are in turn subdivided into many types and subtypes.

[16]

Differential diagnosis

The disease must be distinguished from hemorrhagic eruptions in infectious diseases (measles, influenza, etc.), liver diseases, diabetes, hypertension, C and PP avitaminosis, and other forms of vasculitis (hemorrhagic leukoplastic microbiota, allergic arteriolitis, Verlhof disease, etc.) ), multiforme exudative erythema.

[17], [18], [19], [20], [21], [22]

Treatment of the skin vasculitis

Bed rest and diet are needed. In the presence of an infectious agent, antibiotics are prescribed. Recommended antihistamine, hyposensitizing, restorative vascular wall (ascorutin, nicotinic acid) drugs. In the presence of anemia - blood transfusion. In severe cases, small or medium doses of glucocorticosteroids are administered internally. Antimalarial and non-steroidal anti-inflammatory drugs may be effective.

Of immunocorrecting drugs, proteflasite is prescribed (15-20 drops 2 times a day), which increases the nonspecific resistance of the body and the production of endogenous interferon.

External treatment depends on the stage of the skin-pathological process. With erosive and ulcerative lesions, disinfectant solutions are prescribed in the form of lotions, moistening damp dressings; enzymatic preparations (trypsin, chemotripsin) to remove necrotic tissues. After cleansing ulcers, epithelial agents are applied, corticosteroids. A good effect is provided by a helium-neon laser.