Acute Burn Excision / Skin Grafting | Burn assessment and urgent care

Depth is traditionally described in three degrees, but medically as superficial, partial or dermal, deep dermal and full thickness. Clinical observation is the main guide; mixed depths are common, and early assessment of deep partial burns can be uncertain, with first assessment of second-degree burns estimated accurate in less than 70% of cases. Area is reported as percentage of total body surface area; in adults each arm and head/neck are 9%, each leg and front/back trunk 18%, and perineum/genitalia 1%. Deep burns may need excision and grafting, while full-thickness burns are usually treated this way unless very small. Age and breathing involvement also affect seriousness.

In the acute setting, burns of intermediate depth can progress to full thickness or remain partial thickness. Typically, burns are allowed to declare their depth over the first 3 days. Burn wound conversion can occur when the zone of stasis becomes the zone of coagulation. Indeterminate-depth burns are difficult because early excision risks removing viable dermis, while waiting risks delayed healing. Clinical judgment alone is sound only about half the time, so objective depth assessment methods can help. For small mixed-depth wounds, topical therapy for 3–5 days may let depth become clearer before deciding on excision and grafting. This is why repeated assessment matters.

The American Burn Association criteria include special-area burns, electrical or chemical burns, inhalation injury, full-thickness burns, partial-thickness burns greater than 10% of total body surface area, burns in patients with pre-existing medical disorders, and any burn contributing to higher morbidity or mortality risk. Burns involving more than 10% of body surface area can risk low blood volume, infection and sepsis, so hospitalization may be needed. Even burns under 10% may require admission for pain control, additional injuries, or consideration of excision and grafting. A burn center can provide specialized care and resources. Specialist advice may be obtained and transfer to a burns facility, burns unit or burns centre arranged when admission is needed.

Airway compromise can follow direct thermal damage from hot gases or toxic fumes. Carbon monoxide binds hemoglobin, so tissues receive less oxygen; carboxyhemoglobin may be elevated, including in smokers, and its half-life is 40 minutes on 100% oxygen. There is no indication for steroids or prophylactic antibiotics for inhalation injury. Inhalation injury increases pneumonia or respiratory failure risk. Assessment also checks chest expansion and whether circumferential upper-trunk burns restrict breathing; cervical spine stabilization is needed if injury is suspected. Humidified 100% oxygen should be administered when there is a history of burn in a concealed area or inhalation of fumes. Bronchoscopy is the gold standard when diagnosis is not clinically obvious.

Electric current disrupts cell membranes and can generate heat as it passes through tissues. Nerves and vessels conduct well and may suffer progressive injury, while skin and bone conduct poorly; heat can build around bone and damage nearby tissue. Severity depends on voltage, current, type of current, duration of contact and path of current flow. Low-voltage injuries tend to be localized, whereas high-voltage injuries lead to extensive tissue damage and often loss of limbs. Electrical injuries can be devastating irrespective of their size and can affect children and working men. Fluid resuscitation may be complex because hidden injury is not always visible, and high-voltage injuries carry high mortality.

Initial care removes clothing and irrigates the area, often for at least 30 minutes, but alkaline substances are less soluble in water and may need longer irrigation. Residual alkali can leave a soapy feel, and litmus paper can help verify completeness. Neutralizing acid or alkali is avoided because the reaction can generate heat and deepen injury. Some chemicals are absorbed and may have systemic consequences, so poison-control consultation may be considered. Burn depth can also be indeterminate, and early excision of doubtful areas may sacrifice tissue that could heal. Repeated thorough assessment helps protect the airway, eyes and overall condition, and identify injuries that may have been missed initially.

A circumferential or nearly circumferential full-thickness burn can impair circulation as swelling develops. Edema may reduce distal perfusion, so clinicians look at capillary refill in fingers or toes, proximal swelling and overall perfusion rather than relying only on palpable pulses. Doppler examination can confirm a circulation deficit, but a palpable pulse or audible Doppler signal is not a sure sign that escharotomy can be avoided. Blood pressure measurement may also be difficult with deep circumferential burns. Electrical injuries need repeated examination because compartment problems can develop. Heart rate and blood pressure also help assess organ perfusion. Clinicians may repeat checks over the next few hours. Doppler improves accuracy but does not replace clinical judgment.

Deep full-thickness burns can form a stiff, inelastic eschar. After injury and fluid resuscitation, swelling raises tissue pressure; a nearly circular burn can act like a tourniquet, reducing blood flow to the hand or foot and causing compartment syndrome. A chest burn can similarly limit chest expansion and ventilation. An escharotomy divides this nonviable eschar to restore perfusion or breathing; it is not the same as removing all dead tissue. The need can arise within the first 48 hours. It is usually done at the bedside once the patient is stabilized, with incisions through the eschar into subcutaneous fat. This is an emergency intervention, not routine outpatient care.

Deep partial-thickness burns also usually do not heal spontaneously within three to four weeks, so early excision and grafting may be considered. Indeterminate burns are harder: their healing potential becomes clearer with repeated examination over several days, and an experienced surgeon’s first estimate may be only about 50 to 70 percent accurate. Cause, inspection, palpation and sensation are important clues. Partial-thickness scald burns are often managed without surgery for 10 to 14 days unless clearly full thickness, with excision if they will not heal by three weeks. Serial clinical exams over two weeks have been associated with excising smaller areas or avoiding surgery entirely. The overall goal is wound closure within three weeks.

Excision is usually considered after initial resuscitation, often around hospital day three, although some surgeons excise within twenty-four hours when the patient is stable. Layer-by-layer removal is commonly performed between days three and five because earlier surgery may remove tissue that could recover after resuscitation, while later surgery faces more bacterial colonization and softer wound surfaces. Low body temperature, clotting problems, blood loss, lung problems, burn depth and size, donor skin availability, inhalation injury, and patient stability guide the decision. Operating time is often limited to two to three hours, with attention to temperature and bleeding. The technique and extent also depend on burn site, depth, and patient factors such as age and comorbidities.