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How do sodium and potassium losses affect people with severe burns?

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Cross-section diagram of human skin showing burn depth by degree, with arrows indicating that first-degree burns affect only the epidermis, second-degree burns reach the dermis, third-degree burns extend into subcutaneous tissue, and fourth-degree burns penetrate to muscle. — burn This diagram shows how burn injuries are classified by severity. First-degree burns damage the outer skin, known as the epidermis. First-degree burns are the least severe form of burn injury. Second-degree burns damage the outer skin and some of the underlying skin, known as the dermis, which also includes some connective tissue. Third-degree burns damage all the layers of skin, including subcutaneous tissue. Fourth-degree burns, which are the most severe, destroy every layer of skin and also damage muscle, tendons, and bones.

In individuals with severe burns, the loss of sodium and potassium salts is a critical physiological complication. These losses occur due to the leakage of fluid from the damaged area, which has lost its protective skin covering.1

The impact of these electrolyte losses is twofold:
* Disturbance of Balance: The depletion of sodium and potassium salts disrupts their normal concentration levels within the body.1
* Osmotic Imbalance: These losses alter the osmotic balance of the blood and body fluids.1

When combined with significant fluid loss, these changes contribute to a reduction in blood volume. If more than one-fifth of the blood volume is lost, the heart cannot maintain adequate blood pressure, which can precipitate secondary shock—a life-threatening condition characterized by a dramatic fall in blood pressure, cold extremities, and potential collapse. To manage these effects, medical professionals must replace lost plasma and electrolytes in proportion to the size of the patient and the extent of the burn area.12