Poisoned wounds

Etiology of venomous wounds

The development of a venomous wound occurs when a pathogenic agent penetrates damaged tissues. According to the etiological factor, such lesions can be divided into several main groups.

First, these are bites inflicted by venomous representatives of fauna (snakes, insects, arachnids). Second, wounds can become infected through the direct ingress of various toxic agents. These can be poisons used in everyday life, aggressive industrial chemicals, or chemical warfare agents. A separate category includes wounds that have undergone radioactive contamination, which also determines the specifics of their course and healing.

Venomous snake bites

Among reptiles, the most dangerous are the viper, rattlesnake, cobra, and pit viper. In the territory of the Russian Federation and neighboring countries, bites are most frequently recorded in Central Asia, Transcaucasia, Southern Siberia, and the Far East.

Snake venom itself is a transparent liquid, the color of which varies from yellowish to greenish. It has an acidic reaction and contains a complex set of destructive components: toxins, lysins, and enzymes.

The severity of poisoning depends on a number of factors:

• The species and age of the attacking snake.
• The volume of venom injected into the wound.
• Localization (predominantly lower extremities) and depth of tooth penetration.
• Seasonality: it has been proven that the toxicity of the secretion is significantly higher during the hot season.

Clinical presentation of a snake bite

Symptoms consist of systemic and local effects. The general action of the venom manifests as severe and pronounced intoxication of the entire body.

Local manifestations develop rapidly:

1. Sharp, unbearable pain occurs in the area of the wound.
2. Significant swelling forms. The edema progresses rapidly, involving the entire affected limb, and in severe cases can spread to half of the torso.
3. Point hemorrhages, extensive bruising, and specific blisters filled with hemorrhagic (bloody) fluid appear on the skin.
4. In severe cases, necrosis (death) of soft tissues begins, followed by the formation of deep ulcers.

Frequent complications of snake bites include inflammation of the blood vessels and lymphatic system (thrombophlebitis, lymphangitis, lymphadenitis), as well as purulent processes such as phlegmon and abscesses.

Insect and arachnid bites

Venomous wounds can also result from contact with arthropods. Dangerous arachnids include scorpions, spiders, tarantulas, and black widows (karakurt). Among insects, mosquitoes, bees, wasps, hornets, and horseflies pose a threat.

The general clinical picture of such bites includes pain of varying intensity, pronounced itching, redness (hyperemia), and tissue edema. If a secondary infection joins, purulent complications in the form of abscesses and phlegmon may develop.

Specifics of a black widow (karakurt) bite The effect of karakurt venom deserves special attention, as it causes a severe systemic reaction. The victim develops:

• An unexplained feeling of fear.
• Severe headache and insomnia.
• Tendency to fainting spells.
• A sharp increase in body temperature.
• Pronounced autonomic disorders: profuse sweating, lacrimation, and hypersalivation (excessive salivation).

Class and exam questions

What else to study on this topic

• Pathogenesis of the action of lysins and enzymes of snake venom on tissues
• Principles of surgical debridement and treatment of necrotic ulcers after bites
• Mechanism of action of industrial and chemical warfare agents upon entering a wound
• Specifics of managing wounds subjected to radioactive contamination
• Differential diagnosis and treatment of lymphangitis and phlegmon as complications of venomous wounds

Other topics in "CHAPTER 10. GENERAL ISSUES IN TRAUMATOLOGY"

Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.