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How can carbon monoxide poisoning complicate a fire-related burn injury?

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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.

Carbon monoxide poisoning is a severe complication of fire-related injuries, categorized as a primary form of direct-inhalation injury. It complicates the clinical management of burn patients by significantly impairing the body's ability to transport oxygen.123

When carbon monoxide is inhaled, it binds to hemoglobin with an affinity approximately 200 times greater than that of oxygen, forming carboxyhemoglobin. This process reduces the amount of hemoglobin available to carry oxygen to vital tissues, leading to systemic asphyxiation. Because this condition can cause respiratory failure, myocardial ischemia, and central nervous system damage, it is a major factor in burn-related mortality.231

In the context of a burn injury, patients suspected of having inhaled carbon monoxide require immediate medical intervention, typically involving the administration of 100 percent oxygen to displace the carbon monoxide from the blood. Because respiratory complications are the leading cause of death in burn patients, clinicians often utilize bronchoscopic examinations and mechanical ventilation to manage airway integrity and ensure adequate oxygenation.213