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Burn

life science Maturity 7-9 Next article →

A burn is a serious injury to the skin or other body tissues. These injuries occur when the body is exposed to heat, electricity, chemicals, friction, or ionizing radiation.

Burn Degree Diagram
Burn Degree Diagram

Radiation burns can include sunburns caused by ultraviolet light from the sun. Thermal burns are the most common type. These are caused by contact with fire, hot solids, or hot fluids. When a person is burned by hot liquids or gases, it is specifically called scalding.

Scaldburn
Scaldburn

Most burns happen within homes or workplaces. In many homes, the kitchen is a primary site of risk due to stoves and flames. In workplaces, risks often involve fire, chemicals, or electricity.

To understand how a burn works, we must look at what happens to cells. When temperatures rise above 60 degrees Celsius, proteins begin to lose their three-dimensional shape. This process causes the proteins to break down, leading to tissue damage.

Burn Degree Diagram
Burn Degree Diagram

This damage disrupts the skin's ability to perform vital functions. The skin normally protects us from bacteria and regulates body temperature. It also prevents the evaporation of our body's water. When these functions fail, a person may experience infection or hypothermia. Large burns can also cause hypovolemic shock. This happens because water evaporates away or leaks from the capillaries.

major-2nd-degree-burn
major-2nd-degree-burn

Medical professionals classify burns into different stages based on their depth. A superficial or first-degree burn affects only the outermost skin layers. These appear red and dry without blisters, and the pain usually lasts about three days.

Sunburn
Sunburn

A partial-thickness or second-degree burn extends into the underlying skin layers. These often produce painful blisters and can take up to eight weeks to heal. If the injury reaches the deep dermis, it may appear yellow or white. A full-thickness or third-degree burn extends through all layers of the skin. These areas may look white or brown and feel stiff or leathery. Interestingly, these burns are often painless because the nerves are damaged.

8-day-old-3rd-degree-burn
8-day-old-3rd-degree-burn

Some injuries are even more severe than a third-degree burn. A fourth-degree burn extends through the entire skin into deeper tissues. This includes damage to muscle, tendons, or even bone. These burns often appear black and charred. Because they reach the deepest parts of the body, they frequently lead to the loss of the affected part.

Ожог кисть
Ожог кисть

Treatment for these injuries varies greatly. Small superficial burns may only need simple pain medication. However, major burns often require specialized burn centers. Doctors may use skin grafting, which is a surgical procedure, to help heal deep wounds. For very large burns, patients may require large amounts of intravenous fluids to replace lost moisture.

Different sources can cause these various types of damage. In the United States, fire or flame causes 44% of burns. Scalds account for 33%, while hot objects cause 9%. Electricity causes 4% and chemicals cause 3%.

Wallace rule of nines-en
Wallace rule of nines-en

Chemical burns can be caused by over 25,000 different substances. Most of these are either strong bases or strong acids. Electrical burns are classified by voltage. High voltage is any amount equal to or greater than 1000 volts. Electrical injuries can also cause internal damage that is not visible on the skin. They can even lead to heart problems like cardiac arrest.

History has played a role in how we treat these injuries today. Guillaume Dupuytren was a person who helped develop the classification system for burn degrees.

Guillaume Dupuytren
Guillaume Dupuytren

Since 1960, new treatments have greatly improved outcomes for patients. This is especially true for children and young adults. In the United States, approximately 96% of people admitted to burn centers survive. However, the world still faces a heavy burden from these injuries. In 2015, fire and heat caused 67 million injuries globally. This resulted in 2.9 million hospitalizations and 176,000 deaths.

Deaths from fires and burns, World, 2021 (cropped)
Deaths from fires and burns, World, 2021 (cropped)

Burn patterns can also tell a story about how an injury happened. For example, an immersion scald might show a sharp upper border. This is sometimes called a "sock burn" or "glove burn" if a limb was held in hot water. In the developing world, many women suffer burns from using open cooking fires. Among men, injuries are more likely to come from unsafe workplace conditions. Most burn deaths occur in the developing world, particularly in Southeast Asia.

Death rate from fires and burns ihme, World, 2021 (cropped)
Death rate from fires and burns ihme, World, 2021 (cropped)

While burns are serious, many are preventable through safety and care.

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🖼️ Images & Media (11)
File:Sunburn.jpg
Sunburn.jpg
File:Scaldburn.jpg
Scaldburn.jpg
File:major-2nd-degree-burn.jpg
major-2nd-degree-burn.jpg
File:8-day-old-3rd-degree-burn.jpg
8-day-old-3rd-degree-burn.jpg
File:Ожог кисть.jpg
Ожог кисть.jpg
File:Deaths from fires and burns, World, 2021 (cropped).svg
Deaths from fires and burns, World, 2021...
File:Burn Degree Diagram.svg
Burn Degree Diagram.svg
File:Wallace rule of nines-en.svg
Wallace rule of nines-en.svg
File:Death rate from fires and burns ihme, World, 2021 (cropped).svg
Death rate from fires and burns ihme,...
File:Fires world map - DALY - WHO2004.svg
Fires world map - DALY - WHO2004.svg
File:Guillaume Dupuytren.jpg
Guillaume Dupuytren.jpg
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