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The action of electric current

The action of electric current at short circuit leads to the formation of Electrometry, and at the outbreak of the electric arc, you may experience significant burns and charring of soft tissue and bone (Fig. 88).

Fig. 88. Electrometry. a - at the entrance; 6 - a output current.

The local effect of current, in addition to electromatic and burns, this may cause edema, necrosis, impregnation with metals and damage. Thermal action, electric current is also seen the death of underlying tissues, until charring. Sometimes you can see in the bone tissue kind of education - "pearls", resulting from the fusion of bone with the release of phosphate of calcium. Mechanical action is associated with a spasmodic contractions that may even cause them to rupture.
Electric arc that sometimes occurs between the body and the conductor leads to the fire service and, therefore, education on the body extensive burns. The remains of charred clothing should be carefully investigated to establish the place of contact with the current-carrying conductor. It is necessary to investigate shoes as a unipolar enable it may be a vestige of power. As a rule, Electrometry are pale yellow, gray-white or gray-yellow color. They are dense on palpation, have stuck to the bottom and valikoobraznye raised edge, usually without inflammatory exudative phenomena in the surrounding tissues. Electrometry can be in the form of scratches, small RAS, callus, bleeding into the skin, punctuate tattoo. Sometimes Electrometry remind input bullet holes. The epidermis in Electrometry can be debonded and raised. One of the signs of Electrometry is metallization, which is formed as by close contact with the skin of the subject under tension, and in the case of the electric arc. Traces of metal in the field of electromatic can be detected by the method of color prints.
Microscopic changes in the skin when the electric shock is very distinctive. In Horny and brilliant layers of the epidermis seen numerous voids, giving the epidermis cellular appearance. The form of various sizes of voids can be round, oval and angular. They are often groups, but may occur alone. Horny and brilliant layers of the epidermis is completely separate from the granular layer. In granular and prickly layers of the epidermis also can be emptiness in the form of cracks separating surface layers of cells from the deep. Sometimes modified the epidermis can entirely to pull away from his own skin, standing over her like a bubble, the upper part of which are often broken. More often exfoliated epidermis is separated from the leather itself only a narrow slit. The borders of the cells of the epidermis are specified, the kernel basal and partially thorny and granular layers are stretched, are perpendicular and oblique to the skin surface. Sometimes kernel rejected in two directions, placed by way of Metalock places are observed turbulence nuclei. When the epidermis is separated from the skin, the cells remaining in the cavities between the papillae, are also extended. Using special methods of colouring preparations, can microscopic examination to determine the presence of metals. Under the action of electric current in 10-20% of cases no morphological changes of the skin cannot be found.
Under the action of electricity observed phenomena congestive hyperemia, swelling of the wall and the gallbladder bed, hemorrhage. Plethora, swelling, sometimes petechial hemorrhages are identified in soft the meninges and the brain substance.
In difficult cases, to study current sources, conductors and other data necessary to carry out technical expertise, without which it is impossible to judge about the cause of death.
Of particular importance in electric shock acquires a statement of actual death, since there are cases supposed death, which first of all necessary measures for the provision of health care aimed at the restoration of vital functions (artificial respiration, heart massage and other resuscitation).