Burn Classification and Treatment: 1st, 2nd, and 3rd Degree Field Assessment

Immediate Actions for Any Burn

The first ten seconds after a burn determine a lot. Before classification, before dressings, before anything else:

1. Remove the patient from the heat source. Stop the burning process. Remove burning clothing, move away from fire or steam.

2. Remove jewelry and tight clothing. Before swelling begins. Rings, watches, and tight sleeves will become impossible to remove in 30 minutes.

3. Cool the burn with running water. Cool (not cold, not ice) running water for 20 minutes. This is the single most effective immediate intervention for thermal burns. It removes heat from tissue, reduces the depth of the burn, and reduces pain. Studies show it remains beneficial up to three hours post-injury, not just immediately.

4. Do not apply ice. Ice causes vasoconstriction and can deepen the burn by reducing blood flow to the injured area. Cool water only.

5. Do not apply butter, oil, toothpaste, egg whites, or any home remedy. These trap heat, contaminate the wound, and interfere with assessment. Nothing but water.

Classification by Depth

First Degree (Superficial) Burns

What it looks like: Red, dry skin. No blisters. Pain on touch but intact sensation. Examples: mild sunburn, brief contact with hot surface.

Depth: Confined to the epidermis (outermost skin layer) only.

Healing: 3-5 days without scarring.

Treatment:

• Cool with water during the acute phase
• Aloe vera gel reduces pain and inflammation — this is one of the few evidence-supported uses of aloe
• Over-the-counter ibuprofen or acetaminophen for pain
• Moisturizing lotion after the acute phase
• No dressing required
• Do not break the surface

First degree burns do not require medical attention unless they cover very large areas (entire back or chest) or involve the face.

Second Degree (Partial Thickness) Burns

Second degree burns are more complex because they have two sub-categories with different treatment implications.

Superficial Partial Thickness:

• Appearance: Red, moist, blistered skin. Extremely painful because nerve endings are exposed.
• Depth: Through the epidermis into the upper dermis.
• Capillary refill: Present — the dermis still has blood supply. Blanches when pressed.
• Healing: 10-14 days without significant scarring if kept clean and moist.

Deep Partial Thickness:

• Appearance: Pale, mottled, or waxy skin. May be white or cream-colored. Less painful than superficial partial thickness — deeper nerve damage.
• Depth: Through most of the dermis.
• Capillary refill: Absent or very slow.
• Healing: 21-60 days. High probability of significant scarring. Often requires skin grafting for optimal outcome.

The distinction between superficial and deep partial thickness matters for prognosis and evacuation planning. In the field, if you are unsure, treat as deep and plan for evacuation.

Treatment for second degree burns:

1. After cooling, clean the burn. Gently wash with mild soap and water or dilute chlorhexidine solution. Remove loose debris.

2. Blister management: Leave intact blisters alone. If a blister is larger than a quarter, ruptured, or severely impairing movement, drain it by making a small puncture at the blister base with a sterile needle, allowing fluid to drain, but leaving the blister roof intact as a biological dressing.

3. Apply a wound dressing. Options from best to acceptable:

   • Mepitel or similar non-adherent silicone dressing: Does not stick to the wound, reduces pain on removal, allows drainage
   • Honey dressing: Antimicrobial, maintains moisture, reduces infection risk
   • Petroleum gauze (Vaseline gauze): Non-adherent, maintains moisture
   • Clean non-adherent gauze + petroleum jelly: Improvised option. Apply a thin layer of petroleum jelly (Vaseline) to gauze before applying to wound
   • Avoid standard gauze directly on the wound — it adheres, removes healing tissue on removal, and is extremely painful

4. Cover with outer dressing. Gauze pads and wrap to secure.

5. Change dressings every 24-48 hours or whenever soaked. Inspect for infection signs at each change.

6. Pain management. Burn wounds are extremely painful. Ibuprofen (400-600mg every 6 hours) is the priority — it reduces both pain and inflammation. Acetaminophen can be added. Do not under-treat burn pain; pain causes stress response that impairs healing.

Third Degree (Full Thickness) Burns

What it looks like: White, brown, or black, leathery, dry skin. No blisters. Painless — because all nerve endings in the skin are destroyed. This is a paradox that surprises people: the worst-looking burn is often the least painful locally.

Depth: Destroys the full thickness of the dermis and epidermis. May extend into subcutaneous fat, muscle, or bone.

Healing: Does not heal independently beyond very small areas. Requires skin grafting. Will contract and scar severely without surgical intervention.

Treatment:

Third degree burns require evacuation to a burn center. Field treatment is supportive:

1. Do not attempt to remove burned tissue.
2. Cover with clean, dry dressings or sterile sheets. Moisture management is less critical than for partial thickness burns.
3. Fluid replacement is critical (see below).
4. Prevent hypothermia — full thickness burns destroy the skin's temperature regulation function.
5. Prevent infection — full thickness wounds are effectively open wounds covering a large area.

Assessing Total Body Surface Area (TBSA)

Total body surface area burned determines fluid replacement needs and guides evacuation decisions.

Rule of Nines (Adults)

| Area | Percentage | |---|---| | Head and neck | 9% | | Each arm | 9% | | Chest (front trunk) | 18% | | Abdomen (front trunk) | 9% | | Upper back | 9% | | Lower back | 9% | | Each thigh | 9% | | Each lower leg and foot | 9% | | Genitalia | 1% |

A useful quick check: the patient's palm (not including fingers) represents approximately 1% of their TBSA.

Rule of Nines for Children

Children have proportionally larger heads and smaller legs:

• Head: 18% (versus 9% in adults)
• Each leg: 14% (versus 18% in adults)

What the Percentage Means

• Less than 10% TBSA: manage locally with close monitoring
• 10-20% TBSA: high risk, oral fluid replacement aggressive, evacuate when possible
• Greater than 20% TBSA: medical emergency, IV fluid replacement required, burn center care essential
• Any inhalation injury, circumferential burn, or third degree burn: evacuate regardless of TBSA percentage

Fluid Replacement

Burns destroy the skin barrier, causing massive fluid loss through evaporation and into the burned tissue. Without adequate fluid replacement, patients develop hypovolemic shock.

Oral Fluid Replacement

For burns less than 20% TBSA in conscious patients who are not vomiting:

Use the modified Consensus Formula for oral replacement:

• First 24 hours: 0.5 ml per kg per percent TBSA
• A 70kg person with 15% TBSA burn: 0.5 × 70 × 15 = 525ml total oral supplement in addition to normal fluid intake
• Give this volume of oral rehydration solution (ORS) over 8 hours, then normal drinking as tolerated

Signs of adequate hydration: urine output is present (if the patient is producing urine, they are getting enough fluid). Urine should be pale yellow. Dark, concentrated urine = inadequate fluid intake.

Signs of Inadequate Fluid Replacement

• No urine output for 6+ hours
• Confusion or altered mental status
• Rapid, weak pulse
• Cold, clammy extremities

These signs indicate shock from fluid loss. If IV access is available, start fluids immediately. If not, push oral fluids aggressively if the patient can swallow.

Burns Requiring Evacuation

Evacuate urgently:

• Any third degree burn
• Burns greater than 10% TBSA in adults (5% in children or elderly)
• Burns involving face, hands, feet, genitalia, perineum, or major joints
• Circumferential burns of any extremity (risk of compartment syndrome)
• Suspected inhalation injury: hoarse voice, singed nasal hairs, soot in mouth or throat, difficulty breathing
• Burns with associated trauma
• Burns in extremes of age (very young or elderly)

Burns associated with inhalation injury deserve special mention: the skin burn may appear minor while the airway is severely compromised. A patient who was in an enclosed space during a fire, or who breathed smoke, steam, or chemical fumes needs airway assessment above all else. Hoarseness or stridor (high-pitched breathing) suggests airway swelling that can close within hours.

Infection Prevention

Large burns have no skin barrier against infection. Every surface is an entry point for bacteria.

Field measures:

• Dressing changes under the cleanest conditions possible
• Antibiotic-impregnated dressings (honey, silver-based) for wounds that cannot be kept sterile
• Monitor for systemic infection signs: fever, increasing redness around burn borders, foul odor, pus under dressings
• Prophylactic antibiotics for large burns if available

The most common organisms infecting burns are Pseudomonas aeruginosa and Staphylococcus aureus. If antibiotics are available, coverage should consider both.