Disclaimer: This document provides general medical information for educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Clinical decisions must always be made by a qualified healthcare professional based on the individual patient's condition, available resources, and the latest evidence. Medical practice is constantly evolving; always consult current guidelines and expert opinion.

Fires (Injuries from Fire: Burns and Smoke Inhalation)

Overview

• Definition: Injuries from fires encompass a spectrum of trauma resulting from exposure to heat, flame, hot liquids (scalds), chemicals, electricity, or radiation, often accompanied by inhalation injury from combustion products.
• Epidemiology:
  • Annually, over 400,000 burn injuries receive medical treatment in the United States, with approximately 40,000 requiring hospitalization, including 3,500 deaths.
  • Fire/burn injuries are a leading cause of accidental death and disability, particularly in low- and middle-income countries.
  • Residential fires are a common cause, accounting for a significant proportion of deaths.
  • Highest incidence in pediatric populations (0-4 years) and older adults (>65 years). Males are more frequently affected than females in many age groups.
• Classification:
  • Burn Depth:
    • First-degree (Superficial): Affects epidermis only. Red, painful, blanches with pressure, no blisters. Heals in 3-6 days. E.g., sunburn.
    • Second-degree (Partial-thickness):
      • Superficial Partial-thickness: Epidermis and superficial dermis. Red, painful, moist, sensitive to air, brisk capillary refill, blisters. Heals in 7-21 days.
      • Deep Partial-thickness: Epidermis and deep dermis. Red/waxy white, moist or dry, less painful, sluggish capillary refill, large blisters or ruptured blisters. Heals in 3-6 weeks, often with scarring.
    • Third-degree (Full-thickness): Epidermis, dermis, and subcutaneous tissue. Leathery, dry, waxy white, charred, insensate (pain absent). Requires surgical excision and grafting. Does not heal spontaneously.
    • Fourth-degree: Extends through skin into muscle, bone, or other underlying structures. Black, charred, often associated with electrical injury. Requires extensive surgical intervention.
  • Burn Size (Total Body Surface Area - TBSA):
    • Rule of Nines (Adults): Head & Neck 9%, Each Arm 9%, Anterior Trunk 18%, Posterior Trunk 18%, Each Leg 18%, Perineum 1%.
    • Lund-Browder Chart (Children): More accurate, adjusts for larger head and smaller legs in children.
    • Patient's Palm Method: Patient's palm (including fingers) approximates 1% TBSA. Useful for small, scattered burns.
  • Special Considerations:
    • Inhalation Injury: Injury to the respiratory tract from heat or chemical irritants in smoke.
    • Electrical Burns: Cause deep tissue damage, cardiac arrhythmias, neurological injury.
    • Chemical Burns: Tissue damage dependent on agent, concentration, and duration of contact.
    • Circumferential Burns: Can lead to compartment syndrome.

Pathophysiology

• Mechanism:
  • Thermal Injury: Direct cellular injury from heat leads to protein denaturation, coagulation necrosis, and cell death. The initial burn wound consists of three zones:
    • Zone of Coagulation: Central area, irreversible tissue destruction.
    • Zone of Stasis: Surrounds the zone of coagulation; potentially salvageable tissue, but can progress to full necrosis due to ischemia (vasoconstriction, microvascular thrombosis, edema).
    • Zone of Hyperemia: Outermost area, minimal cellular damage, rapid healing.
  • Systemic Inflammatory Response Syndrome (SIRS): Large burns (>20% TBSA) trigger a profound systemic inflammatory response, leading to increased capillary permeability, massive fluid shifts (edema), hypovolemic shock, hypermetabolic state, and immunosuppression.
  • Inhalation Injury:
    • Upper Airway Injury (Supraglottic): Direct heat causes mucosal edema and airway obstruction.
    • Lower Airway/Parenchymal Injury (Subglottic): Chemical irritants in smoke (e.g., aldehydes, acrolein, sulfur dioxide, hydrochloric acid) cause inflammation, bronchospasm, increased mucous production, impaired ciliary function, surfactant dysfunction, and direct cellular damage, leading to impaired gas exchange and Acute Respiratory Distress Syndrome (ARDS).
    • Systemic Toxicities:
      • Carbon Monoxide (CO) Poisoning: CO binds to hemoglobin with 200-250 times higher affinity than oxygen, forming carboxyhemoglobin (COHb), reducing oxygen-carrying capacity. It also shifts the oxyhemoglobin dissociation curve to the left, impairing oxygen unloading to tissues. Furthermore, CO inhibits cellular respiration by binding to cytochrome c oxidase. Results in cellular hypoxia.
      • Cyanide (HCN) Poisoning: Produced by combustion of nitrogen-containing materials (plastics, wool, silk). Cyanide inhibits cytochrome c oxidase in the mitochondrial electron transport chain, causing histotoxic hypoxia by disrupting cellular oxidative phosphorylation and ATP production. Leads to lactic acidosis.
• Risk Factors:
  • Increased Burn Severity/Mortality: Extremes of age (<2 years, >60 years), increased TBSA, full-thickness burns, presence of inhalation injury, pre-existing medical comorbidities (e.g., cardiac, pulmonary, renal disease, diabetes, immunosuppression), associated trauma, delayed presentation, substance abuse, psychiatric illness.
  • Increased Risk of Injury: Socioeconomic factors, living alone, lower education levels, occupational hazards, lack of smoke detectors/fire safety measures.
• Protective Factors:
  • Working smoke detectors and carbon monoxide detectors.
  • Functional fire extinguishers and sprinkler systems.
  • Developing and practicing a home fire escape plan.
  • Lowering water heater temperature to <120°F (49°C) to prevent scalds.
  • Careful handling of flammable materials and heating sources.
  • Wearing appropriate personal protective equipment (PPE) in occupational settings.

Clinical Presentation

Signs and Symptoms

• Cardinal Features:
  • Burns: Erythema, pain (variable with depth), blisters, swelling, skin discoloration (waxy white, leathery, charred black), absent sensation (full-thickness).
  • Inhalation Injury: Hoarseness, stridor, cough, wheezing, dyspnea, soot in sputum/oropharynx/nares, singed nasal/facial hairs, facial burns, burns around the mouth or neck, history of enclosed space fire.
  • CO Poisoning: Headache, nausea, dizziness, weakness, altered mental status, cherry-red skin (rare and late sign).
  • Cyanide Poisoning: Headache, dizziness, altered mental status, seizures, coma, cardiovascular collapse, lactic acidosis (severe). Odor of bitter almonds (only in ~50% of people).
• Early Signs:
  • Burns: Erythema, pain, superficial blisters, swelling.
  • Inhalation Injury: Hoarseness, dry cough, mild inspiratory stridor, facial/neck burns.
  • Systemic: Headache, nausea, lightheadedness (CO), early disorientation (CO/cyanide).
• Advanced Signs:
  • Burns: Pale/leathery/charred skin, absent pain sensation, profound edema, compartment syndrome (with circumferential burns).
  • Inhalation Injury: Severe stridor, respiratory distress (tachypnea, accessory muscle use, retractions), hypoxemia, respiratory failure.
  • Systemic: Seizures, coma, cardiovascular collapse, profound lactic acidosis, cardiac arrhythmias, rhabdomyolysis (electrical).
• Atypical Presentations:
  • Silent Hypoxia: Normal pulse oximetry readings in CO poisoning (due to COHb being interpreted as oxyhemoglobin).
  • Delayed Respiratory Distress: Inhalation injury symptoms can worsen insidiously over 12-48 hours.
  • Neurological Deficits: Can occur hours to days after electrical injury or severe CO poisoning.

Physical Examination

• Inspection:
  • General: Assess level of consciousness (GCS), vital signs, respiratory effort. Look for signs of associated trauma.
  • Burns: Systematically assess burn depth, size (TBSA), and location. Note presence of blisters, erythema, charring, leathery texture. Identify circumferential burns.
  • Airway/Respiratory: Inspect face, neck, and oropharynx for burns, soot, singed hairs, erythema, or edema. Listen for stridor, wheezing, decreased breath sounds. Assess sputum color.
  • Circulatory: Assess skin color (though cherry-red is rare with CO), signs of shock (pallor, diaphoresis).
• Palpation:
  • Skin: Assess texture (soft, boggy, leathery), temperature, and pain response. Check capillary refill (prolonged or absent in compromised circulation from circumferential burns).
  • Pulses: Palpate peripheral pulses distal to circumferential limb burns to assess for vascular compromise.
  • Edema: Note degree of swelling.
• Special Tests:
  • Bronchoscopy: Considered the gold standard for diagnosing and assessing the severity of inhalation injury. Performed early in patients with suspected inhalation injury.

Diagnostic Approach

History Taking

• Key Questions:
  • Mechanism of Injury: How did the burn occur (flame, scald, chemical, electrical, flash, explosion)?
  • Environment: Was the patient in an enclosed space during the fire? (High suspicion for inhalation injury).
  • Duration of Exposure: How long was the patient exposed to the heat/smoke/chemical?
  • Associated Trauma: Was there a fall, blast, or other traumatic event?
  • Loss of Consciousness: Did the patient lose consciousness? If so, for how long?
  • Agent: What chemicals or electricity were involved?
  • Pain/Sensation: Describe pain characteristics and sensory changes in the affected area.
  • Respiratory Symptoms: Hoarseness, cough, difficulty breathing, soot in sputum?
  • Past Medical History: Allergies, medications, pre-existing comorbidities (cardiac, pulmonary, renal, diabetes), smoking history, pregnancy status, last tetanus shot.
  • Social History: Alcohol or drug use, psychiatric history (consider non-accidental trauma/self-harm).
• Red Flags:
  • Burns to the face, neck, hands, feet, perineum, genitalia, or major joints.
  • Full-thickness burns of any size.
  • Partial-thickness burns >10% TBSA (adults) or >5% TBSA (children).
  • Circumferential burns.
  • Any suspected inhalation injury.
  • Electrical or chemical burns.
  • Burns with associated trauma (fractures, head injury).
  • Burns in patients with pre-existing medical conditions that could complicate recovery.
  • Burns in patients at extremes of age (very young, very old).
  • Suspicion of non-accidental trauma or self-inflicted injury.

Laboratory Tests

• First-Line:
  • Arterial Blood Gas (ABG) / Venous Blood Gas (VBG): Assess acid-base status, oxygenation, and ventilation. Pao2 may be normal in CO poisoning.
  • Carboxyhemoglobin (COHb) level: Essential for any patient with suspected smoke inhalation or fire exposure, even without overt symptoms.
  • Lactate level: Elevated in cyanide poisoning, severe hypoperfusion, or shock.
  • Complete Blood Count (CBC): Baseline, monitor for anemia/hemoconcentration.
  • Electrolytes, Blood Urea Nitrogen (BUN), Creatinine: Assess renal function and fluid balance.
  • Glucose: Especially important in children (risk of hypoglycemia) and diabetics.
  • Urinalysis: Check for myoglobinuria/hemoglobinuria in electrical burns or crush injury.
  • Type and Cross-Match: For patients with large TBSA burns requiring potential transfusion.
• Confirmatory:
  • Cyanide level: Though often not rapidly available, it can confirm suspected cyanide poisoning.
• Monitoring:
  • Repeat COHb and lactate levels as indicated by clinical status and treatment.
  • Serial electrolytes, renal function, and fluid balance.
  • Serial CBCs to monitor for infection or anemia.
  • Urine output (hourly).

Imaging

• Recommended:
  • Chest X-ray (CXR): Obtain baseline. Often normal in early inhalation injury, but infiltrates, atelectasis, or ARDS can develop over 24-48 hours.
  • C-spine imaging: If there is a suspicion of associated trauma (e.g., fall, blast, altered mental status).
• Advanced:
  • Computed Tomography (CT) of the Chest: May be used in specific cases to assess extent of parenchymal lung injury, especially if CXR is inconclusive or if there's suspicion of barotrauma post-ventilation. Not routinely performed.
  • Radionuclide Ventilation/Perfusion Scan: Can demonstrate regional differences in ventilation/perfusion indicative of inhalation injury, but not routinely used in acute management.

Management

Acute Management (Adherence to ATLS principles - Primary and Secondary Survey)

• Immediate (Primary Survey - ABCDE):
  1. Airway (A) with C-spine protection:
     • Assess for signs of inhalation injury (facial burns, singed nasal/facial hairs, hoarseness, stridor, soot in oropharynx/sputum, enclosed space fire).
     • Early intubation is critical for impending airway obstruction, especially in patients with significant facial/neck burns or signs of upper airway edema, as edema can worsen rapidly and make intubation impossible later.
     • Maintain cervical spine precautions if associated trauma is suspected.
  2. Breathing (B):
     • Administer 100% high-flow oxygen via a non-rebreather mask to all patients with suspected smoke inhalation or significant burns (to reduce CO half-life and improve tissue oxygenation).
     • Assess respiratory rate, effort, breath sounds.
  3. Circulation (C):
     • Establish two large-bore intravenous (IV) lines (16-gauge or larger) in unburned skin if possible. Central venous access may be necessary for large burns.
     • Begin fluid resuscitation based on TBSA (see below).
     • Monitor vital signs (HR, BP, RR, SpO2) and cardiac rhythm.
     • Assess for signs of shock.
  4. Disability (D):
     • Assess neurological status using GCS.
     • Check capillary blood glucose (hypoglycemia risk, especially in children).
     • Look for other injuries.
  5. Exposure (E) and Environment Control:
     • Completely remove all clothing, jewelry, and restrictive items to prevent further injury and allow full assessment.
     • Cover the patient with clean, dry sheets/blankets to prevent hypothermia (large burns lead to significant heat loss).
     • Stop the burning process: Small burns can be cooled with cool (not cold) water; do NOT cool large TBSA burns due to hypothermia risk. Chemical burns require copious irrigation.
• Stabilization:
  • Fluid Resuscitation: Essential for burns >15-20% TBSA in adults, >10% TBSA in children.
    • Parkland Formula (Adults): 4 mL Lactated Ringer's (LR) x Patient weight (kg) x % TBSA burned.
      • Administer half of the calculated total volume over the first 8 hours from the time of injury.
      • Administer the remaining half over the next 16 hours.
    • Pediatric Fluid Resuscitation: 3 mL LR x Patient weight (kg) x % TBSA burned, PLUS maintenance fluids (e.g., D5LR for younger children).
    • Titration: Fluid resuscitation should be titrated to urine output (0.5-1.0 mL/kg/hr for adults, 1-2 mL/kg/hr for children) and clinical response (heart rate, blood pressure, mental status). Avoid over-resuscitation, which can worsen edema and lead to complications.
  • Pain Management: Administer IV opioids (e.g., fentanyl, morphine) frequently titrated to effect. Oral medications are unreliable due to delayed absorption. Consider ketamine for procedural sedation.
  • Burn Wound Care:
    • Cover cleaned burns with clean, dry dressings or sheets.
    • Do not apply topical agents (e.g., ointments, butter) in the prehospital or initial emergency department setting.
    • Ruptured blisters may be debrided, but intact blisters are usually left alone initially unless very large or over a joint.
  • Circumferential Escharotomy:
    • Perform promptly if circumferential full-thickness burns of an extremity or torso compromise circulation (loss of pulses, sensation, cap refill) or respiration (with chest wall burns).
    • Incision through the eschar to relieve pressure.
  • Specific Antidotes (for systemic toxins):
    • CO Poisoning: Continue 100% oxygen via non-rebreather mask until COHb level <5-10% (or symptoms resolve). Consider Hyperbaric Oxygen Therapy (HBO) for severe cases (COHb >25%, neurological symptoms, loss of consciousness, pregnancy, cardiac ischemia, persistent symptoms despite normobaric oxygen).
    • Cyanide Poisoning:
      • Hydroxocobalamin: First-line for suspected cyanide poisoning (5 g IV infused over 15 minutes, can repeat once).
      • Sodium Thiosulfate: Alternative or adjunct (12.5 g IV over 20 minutes).
      • Amyl nitrite/Sodium nitrite (risk of methemoglobinemia): Less common given hydroxocobalamin availability.
• Emergency:
  • Transfer to a Burn Center: American Burn Association (ABA) transfer criteria include (but are not limited to):
    • Partial-thickness burns >10% TBSA.
    • Full-thickness burns of any size.
    • Burns to the face, hands, feet, genitalia, perineum, or major joints.
    • Electrical burns, including lightning injury.
    • Chemical burns.
    • Inhalation injury.
    • Burn injury in patients with pre-existing medical conditions that could complicate management, prolong recovery, or affect mortality.
    • Any burns with associated trauma (e.g., fractures) where the burn injury poses the greatest risk.
    • Burn injury in children in hospitals without qualified personnel or equipment.
    • Burn injury in patients who will require special social, emotional, or rehabilitative intervention.

Chronic Management

• Pharmacological:
  • Topical Antimicrobials: Applied to prevent infection (e.g., silver sulfadiazine, mafenide acetate, bacitracin). Choice depends on burn depth and wound characteristics.
  • Systemic Antibiotics: Generally NOT used prophylactically due to risk of resistance. Reserved for confirmed infections.
  • Pain Management: Multimodal approach for chronic pain (neuropathic pain with gabapentin/pregabalin, NSAIDs, acetaminophen, opioids if necessary).
  • Antihistamines: For pruritus (e.g., hydroxyzine, diphenhydramine).
  • Tetanus Prophylaxis: All burn patients.
• Non-pharmacological:
  • Wound Debridement: Surgical excision of non-viable tissue.
  • Skin Grafting: Autografts are used for full-thickness burns and deep partial-thickness burns that do not heal spontaneously.
  • Physical and Occupational Therapy: Crucial for preventing contractures, maintaining range of motion, improving strength, and regaining functional independence.
  • Scar Management: Pressure garments, silicone sheets/gels, massage, intralesional steroid injections, laser therapy, surgical scar revision to minimize hypertrophic scarring and keloids.
  • Nutritional Support: Burn patients are in a hypermetabolic state and require high protein, high calorie intake. Enteral feeding is preferred over parenteral.
  • Psychological Support: Counseling, psychotherapy, and support groups for PTSD, depression, anxiety, and body image issues.
• Monitoring:
  • Regular assessment of wound healing, infection, and graft take.
  • Monitoring of nutritional status and weight.
  • Assessment of range of motion, functional ability, and development of contractures.
  • Ongoing psychological assessment and support.

Treatment Algorithms

• First-Line (Acute):
  1. Airway/Breathing/Circulation (ABC) Management: Secure airway (early intubation if needed), administer 100% O2, initiate fluid resuscitation.
  2. Assessment and Stabilization: Complete burn assessment (TBSA, depth, location), address associated injuries, manage pain, prevent hypothermia.
  3. Antidotes for Toxins: Administer hydroxocobalamin for suspected cyanide poisoning, continue O2 for CO.
  4. Burn Center Transfer: Expedite transfer per ABA guidelines.
• Second-Line (In-Hospital):
  1. Surgical Intervention: Early tangential excision and skin grafting for appropriate burns.
  2. Infection Control: Strict wound care, topical antimicrobials, systemic antibiotics for confirmed infections.
  3. Nutritional Support: Initiate early and aggressive nutritional support.
  4. Rehabilitation: Early mobilization and initiation of physical/occupational therapy.
• Refractory Cases:
  • Non-healing Wounds: Investigate for infection, inadequate debridement, underlying systemic issues (e.g., malnutrition, immunosuppression). May require repeat debridement or alternative wound coverage.
  • Severe Contractures: Aggressive physical therapy, serial splinting, and reconstructive surgical procedures.
  • Chronic Pain/Pruritus: Multidisciplinary pain management, nerve blocks, specialized topical agents, psychological support.
  • Psychological Morbidity: Intensive psychotherapy, pharmacotherapy, and long-term follow-up with mental health professionals.

Complications

• Common:
  • Infection: Cellulitis, wound infection, pneumonia, urinary tract infection, sepsis. Common pathogens include Pseudomonas aeruginosa, Staphylococcus aureus (including MRSA), Klebsiella pneumoniae.
  • Acute Kidney Injury (AKI): From hypoperfusion, rhabdomyolysis (electrical), or sepsis.
  • Acute Respiratory Distress Syndrome (ARDS): From severe inhalation injury or sepsis.
  • Ileus: Due to systemic inflammatory response.
  • Curling's Ulcer: Stress-induced gastric/duodenal ulceration. Prophylaxis with PPIs is common.
  • Anemia: From blood loss, hemolysis, or bone marrow suppression.
• Serious:
  • Sepsis/Septic Shock: Leading cause of death in hospitalized burn patients.
  • Airway Obstruction: Rapidly progressing edema in inhalation injury.
  • Compartment Syndrome: Due to circumferential burns or massive edema.
  • Multiorgan Failure (MOF).
  • Rhabdomyolysis: Especially with electrical burns.
  • Cardiac Arrhythmias: Particularly with electrical burns.
• Long-term:
  • Hypertrophic Scars and Keloids: Disfiguring, pruritic, often painful.
  • Contractures: Limiting range of motion and function, requiring surgery.
  • Chronic Pain and Pruritus.
  • Dyspigmentation: Hypo- or hyperpigmentation.
  • Psychological Sequelae: Post-traumatic stress disorder (PTSD), depression, anxiety, body image disturbance, social isolation.
  • Heterotopic Ossification: Formation of bone in soft tissues around joints, especially after deep burns or high-voltage electrical injuries.
  • Chronic Lung Disease: After severe inhalation injury.

Prognosis

• Factors:
  • TBSA: Directly correlated with mortality; >40% TBSA has significantly higher mortality.
  • Age: Extremes of age (very young and very old) have higher mortality.
  • Inhalation Injury: Presence of inhalation injury significantly increases morbidity and mortality, independent of TBSA.
  • Burn Depth: Full-thickness burns carry a worse prognosis.
  • Associated Trauma: Concomitant injuries worsen outcomes.
  • Pre-existing Comorbidities: Impaired physiological reserve increases mortality risk.
  • Baux Score: A commonly used prognostic indicator = Patient Age + % TBSA Burned. A score >100 is generally associated with very high mortality.
• Survival: Advances in burn care have significantly improved survival rates, but mortality remains high for severe burns. For example, a 50% TBSA burn carries a survival rate of approximately 50% in adults without inhalation injury, but much lower with.
• Quality of Life: Survivors often face lifelong challenges including chronic pain, pruritus, scarring, functional limitations (especially hand/joint burns), and significant psychological distress (PTSD, depression, anxiety), which profoundly impact their quality of life, employment, and social integration. Comprehensive rehabilitation is essential for maximizing functional and psychological outcomes.

Prevention

• Primary Prevention (Preventing Initial Occurrence):
  • Home Fire Safety:
    • Install and regularly test (monthly) smoke detectors on every level of the home and outside sleeping areas. Replace batteries twice a year and units every 10 years.
    • Install carbon monoxide detectors.
    • Have a fire escape plan and practice it regularly with all family members.
    • Keep fire extinguishers readily accessible and know how to use them.
    • Never leave cooking unattended.
    • Keep matches, lighters, and flammables out of reach of children.
    • Maintain heating equipment and chimneys.
    • Ensure safe electrical wiring and avoid overloading outlets.
  • Scald Prevention:
    • Lower hot water heater temperature to no more than 120°F (49°C).
    • Test bathwater temperature before putting children in.
    • Supervise children around hot liquids/foods.
  • Chemical/Electrical Safety:
    • Store chemicals in original, labeled containers, out of reach.
    • Use GFCIs (Ground Fault Circuit Interrupters) in wet areas.
    • Educate children about electrical safety.
• Secondary Prevention (Early Detection and Intervention):
  • Immediate and appropriate first aid for burns (cool water for small burns).
  • Rapid transport to a medical facility for evaluation of significant burns.
  • Early recognition and management of inhalation injury.
• Tertiary Prevention (Preventing Complications and Maximizing Recovery):
  • Comprehensive burn center care, including early surgical debridement and grafting.
  • Aggressive nutritional support.
  • Intensive physical and occupational therapy to prevent contractures and restore function.
  • Scar management programs (pressure garments, silicone).
  • Psychological support and long-term follow-up.

Special Populations

• Pediatric:
  • TBSA Calculation: Lund-Browder chart is more accurate for children than the Rule of Nines due to differing body proportions (larger head, smaller legs proportionally).
  • Fluid Resuscitation: Require lower initial fluid rates (3 mL/kg/%TBSA) plus maintenance intravenous fluids (e.g., D5LR) to prevent hypoglycemia and provide baseline hydration.
  • Physiological Differences: Higher surface area-to-mass ratio, making them more susceptible to hypothermia and fluid shifts. Higher metabolic rate.
  • Non-Accidental Trauma: High index of suspicion for child abuse with suspicious burn patterns (e.g., immersion burns with clear lines of demarcation, glove-and-stocking distribution, cigarette burns).
• Geriatric:
  • Skin Fragility: Thinner skin, predisposing to deeper burns with less exposure.
  • Comorbidities: Higher prevalence of pre-existing cardiovascular, respiratory, renal, and diabetic conditions, which worsen prognosis and complicate management.
  • Physiological Reserve: Diminished physiological reserve, making them less tolerant to stress of burn injury and more prone to complications (e.g., infection, delirium, cardiac events).
  • Higher Mortality: Significant increase in mortality rates compared to younger adults for similar burn size/depth.
• Pregnancy:
  • Maternal and Fetal Well-being: Management focuses on both mother and fetus. Fetal monitoring (heart rate, movement) is crucial.
  • Physiological Changes: Increased circulating blood volume, increased respiratory rate, altered drug metabolism.
  • CO Poisoning: Fetal hemoglobin has a higher affinity for CO than adult hemoglobin, making the fetus more vulnerable. Hyperbaric oxygen is often indicated for pregnant patients with CO poisoning regardless of COHb level.
• Comorbidities:
  • Diabetes: Impaired wound healing, increased infection risk, potential for glycemic instability.
  • Cardiovascular/Pulmonary Disease: Limits fluid tolerance (risk of fluid overload, pulmonary edema), higher risk of ARDS, cardiac arrhythmias, and respiratory complications, especially with inhalation injury.
  • Renal Disease: Requires careful fluid and electrolyte management, potential for dialysis.
  • Immunocompromised States: Increased susceptibility to infection and delayed wound healing.

Clinical Pearls

• Diagnostic:
  • Airway is Paramount: Always prioritize airway assessment and secure it early if any suspicion of inhalation injury exists. Once significant edema sets in, intubation becomes exceedingly difficult or impossible.
  • CO Poisoning - Pulse Oximetry is Misleading: Standard pulse oximetry cannot differentiate oxyhemoglobin from carboxyhemoglobin, thus may show normal SpO2 despite severe CO poisoning. COHb level is essential.
  • Burn Depth Evolution: Initial assessment of burn depth can be challenging; deep partial-thickness burns may appear superficial initially and evolve over 24-48 hours.
  • Circumferential Burns - Think Compartment Syndrome: Any circumferential full-thickness burn, especially of extremities, requires close monitoring for vascular compromise and prompt escharotomy if needed.
• Treatment:
  • Fluid Resuscitation - Not a Rigid Formula: The Parkland formula is a guide. Titrate fluid administration to clinical endpoints (urine output, heart rate, mean arterial pressure, mental status). Avoid both under-resuscitation (shock) and over-resuscitation (pulmonary edema, abdominal compartment syndrome).
  • Pain Management - Aggressive but Safe: Burn pain is severe. Use IV opioids and consider multimodal analgesia. Opioid addiction is less common when used for acute severe pain.
  • Hypothermia Prevention: Large burn surfaces lose heat rapidly. Keep patients covered and the environment warm.
  • Tetanus Prophylaxis: All burn patients are at risk for tetanus due to the nature of the wound; ensure up-to-date immunization status and administer tetanus toxoid/immunoglobulin as indicated.
• Pitfalls:
  • Underestimating TBSA or Depth: Leads to inadequate fluid resuscitation and delayed definitive care.
  • Delaying Intubation: The most common and potentially catastrophic mistake in inhalation injury.
  • Missing Associated Injuries: In trauma, especially electrical burns or falls.
  • Ignoring Psychological Impact: Long-term psychological sequelae are common and require dedicated support.
  • "Topicalizing" Large Burns in the ED: Large burns need systemic management (fluids, airway) and transport to a burn center; excessive topical applications in the ED can delay critical care.

Recent Updates

• Guidelines: Current American Burn Association (ABA) guidelines emphasize early excision and grafting for deep burns, protocolized fluid resuscitation with careful titration, and multidisciplinary team care from acute resuscitation through rehabilitation. There is an increasing focus on the long-term psychological and functional outcomes.
• Evidence:
  • Continued research into optimal fluid resuscitation strategies, including the role of colloids and goal-directed resuscitation beyond fixed formulas.
  • Advancements in burn wound care, including new biosynthetic skin substitutes and cultured epidermal autografts for massive burns.
  • Improved understanding of the hypermetabolic response to burn injury and refined nutritional support strategies.
  • Emerging evidence on non-opioid pain management strategies (e.g., regional blocks, ketamine infusions, novel analgesics) to reduce opioid dependence.
  • Increased recognition and treatment of the mental health impact of burn injury.
• Controversies:
  • Optimal Fluid Resuscitation: Debate continues regarding the ideal fluid (crystalloids vs. colloids), rate, and endpoints to minimize complications like fluid creep.
  • Timing of Escharotomy: While generally indicated for vascular compromise, the exact timing and criteria for when to perform remain a point of discussion.
  • Role of Prophylactic Antibiotics: Generally discouraged due to resistance concerns, but selective use in specific scenarios remains debated.

Key References

• Guidelines:
  • American Burn Association (ABA) Practice Guidelines: Comprehensive guidelines covering all aspects of burn care, periodically updated.
  • Advanced Trauma Life Support (ATLS) Student Course Manual: Provides foundational principles for initial assessment and management of trauma patients, highly relevant for burn patients, especially those with associated trauma.
  • National Institutes of Health (NIH) Consensus Statement on Hyperbaric Oxygen Therapy for Carbon Monoxide Poisoning.
• Studies:
  • Baxter CR. "Fluid Resuscitation of the Burned Patient." Clin Plast Surg. 1978;5(4):641-51. (Landmark work on Parkland formula).
  • Ryan CM, Schoenfeld DA, Thorpe RC, et al. "Objective estimates of the probability of death from burn injuries." N Engl J Med. 1998;338(6):362-6. (Baux score and prognostic factors).
  • Pruitt BA Jr, Shimazu T, Sasai K. "Pulmonary complications in burn patients." J Trauma. 1988;28(9 Suppl):S86-91. (Classic work on inhalation injury).
• Reviews:
  • Journal of Burn Care & Research: Primary journal for burn-related scientific articles.
  • Critical Care Medicine, Annals of Surgery, New England Journal of Medicine: Often publish comprehensive reviews or landmark studies relevant to burn patient management.