INTRODUCTION — Burns are a leading cause of accidental injury and death in the United States and worldwide [1-5]. Each year approximately one million people in the United States seek medical care for burns, approximately one-third of these in the emergency department [1,4-6]. Although the vast majority of injuries do not require hospitalization, severe burns can lead to significant morbidity and death.
The initial assessment and management of the patient with moderate and severe thermal burns will be reviewed here. Details of burn classification, burn management in children, treatment of minor burns, and other issues related to burn management are discussed separately. (See “Classification of burn injury” and “Emergency care of moderate and severe thermal burns in children” and “Overview of the management of the severely burned patient” and “Management of burn wound pain and itching” and “Treatment of minor thermal burns” and “Inhalation injury from heat, smoke, or chemical irritants” and “Overview of inpatient management in the adult trauma patient”.)
CLASSIFICATION OF BURNS — A combination of the burn mechanism, burn depth, extent, and anatomic location helps determine the overall severity of the burn injury (minor, moderate, severe), which provides general guidance for the preferred disposition (table 1) and care of these patients. Therefore it is important that clinicians properly characterize the size and severity of their patients’ burns. Reassessment of thermal burn size and depth (figure 1 and table 2) is important, particularly early in the management of patients with severe injuries, as the extent of injury often increases. (See “Classification of burn injury”.)
INITIAL ASSESSMENT AND TREATMENT
Initial interventions — Assessment and initial treatment of severe burns is performed simultaneously with trauma resuscitation (algorithm 1). Initial management focuses on stabilizing the airway, breathing, and circulation (ABC’s). The primary evaluation includes assessing for evidence of respiratory distress and smoke inhalation injury, evaluating cardiovascular status, looking for other injuries, and determining the depth and extent of burns. (See ‘Classification of burns’ above.)
Hot and burned clothing and debris is removed (caretakers should take precautions to avoid injuring themselves when removing such material). Early transfer to a burn center should be arranged when injuries meet the criteria for major burns (table 1). Burn patients may sustain single or multisystem trauma and should be evaluated accordingly. (See “Initial management of trauma in adults”.)
History — Paramedics, other victims, or the patient may be able to provide important information such as what burned (eg, chemicals, plastics, textiles), the location of the fire (eg, enclosed or open space), whether an explosion occurred (possibly causing a blast injury), whether the patient used alcohol or drugs, and whether there was associated trauma (eg, from falling debris). The AMPLE trauma history should be obtained, if possible (Allergies, Medications, Past medical history, Last meal, Events).
Assessment and approach — Despite advances in ventilatory management, inhalation injury remains a leading cause of death in adult burn victims [1,4,5]. The risk of inhalation injury increases with the extent of the burn and is present in two-thirds of patients with burns greater than 70 percent of the total body surface area (TBSA) . While assessing the airway, clinicians should immobilize the patient’s cervical spine as appropriate.
It is critical to maintain the airway and provide supplemental oxygen in patients with major burns . Upper airway edema following a burn-related injury can occur rapidly. Among patients who manifest signs of smoke inhalation, a sizable percentage develop complete airway obstruction and there is no clinical means to determine which patients will do so . Fluid resuscitation can exacerbate laryngeal swelling, increasing the difficulty of tracheal intubation. Therefore, intubation should not be delayed if severe inhalation injury or respiratory distress is present or anticipated. Intubation prior to transport is prudent for many patients who require transfer to a burn center. Succinylcholine may be used as part of a rapid sequence intubation during the first 72 hours following a severe burn, but not thereafter because of the risk of severe hyperkalemia. A significant percentage of intubated burn patients will develop acute respiratory distress syndrome (ARDS). (See “Emergency airway management in the adult with direct airway trauma” and “Rapid sequence intubation for adults outside the operating room” and “Neuromuscular blocking agents (NMBAs) for rapid sequence intubation in adults outside of the operating room”, section on ‘Succinylcholine’and “Acute respiratory distress syndrome: Clinical features, diagnosis, and complications in adults”.)
Common signs of significant smoke inhalation injury and the potential need for intubation include:
●Persistent cough, stridor, or wheezing
●Deep facial or circumferential neck burns
●Nares with inflammation or singed hair
●Carbonaceous sputum or burnt matter in the mouth or nose
●Blistering or edema of the oropharynx
●Depressed mental status, including evidence of drug or alcohol use
●Hypoxia or hypercapnia
●Elevated carbon monoxide and/or cyanide levels
Injury from the inhalation of hot gases generally occurs above the vocal cords and can cause significant edema. (See “Inhalation injury from heat, smoke, or chemical irritants”.)
Flash burns often harm the face but rarely involve the airway, unlike severe burns from prolonged heat exposure associated with smoke inhalation.
Diagnostic tests and monitoring — Although initial results may be misleadingly normal, studies to assess pulmonary function should be obtained in patients at risk for inhalation injury . These include an arterial blood gas (ABG) and a chest radiograph. Serial peak expiratory flow rates (PEFR), if obtainable, in addition to repeat ABGs, can provide evidence of declining pulmonary function, and are particularly useful early in a patient’s course. These studies can be repeated whenever findings from repeat examinations, pulse oximetry, or capnography suggest a decline in clinical status. (See “Simple and mixed acid-base disorders”.)
Monitoring of end-tidal CO2 (EtCO2) using capnometry or capnography can provide useful information about respiratory status, adequacy of resuscitation, and potential cyanide toxicity, and should be initiated if feasible. A serum lactate concentration should also be obtained if cyanide poisoning is a concern. If available, fiberoptic laryngoscopy and bronchoscopy can assess the extent of airway injury and assist with intubation . An electrocardiogram (ECG) is obtained to assess for cardiac dysfunction. (See “Carbon dioxide monitoring (capnography)” and “Inhalation injury from heat, smoke, or chemical irritants”.)
Carbon monoxide and cyanide — The potential for carbon monoxide poisoning mandates that a carboxyhemoglobin level be obtained in all patients with moderate or severe burns. Standard pulse oximetry is NOT reliable with significant carbon monoxide toxicity. A standard arterial blood gas reports the concentration of oxygen dissolved in blood and cannot be used to establish or rule out the diagnosis of carbon monoxide or cyanide poisoning. (See “Carbon monoxide poisoning”, section on ‘Diagnosis’.)
Hyperbaric oxygen treatment may be needed if carbon monoxide levels are high, or if treatment for cyanide poisoning with methemoglobin is necessary but places the patient at risk for severe hypoxemia. Efforts to transport the patient for hyperbaric treatment must not detract from airway management and fluid resuscitation, the most important components of initial burn resuscitation. Treatment with high flow oxygen alone effectively removes carbon monoxide and the benefits of hyperbaric treatment remain a source of controversy. (See “Carbon monoxide poisoning”, section on ‘Hyperbaric oxygen’.)
Clinicians should consider the possibility of cyanide toxicity and keep a low threshold for initiating treatment. Complicating the diagnosis is the depressed level of consciousness of many severe burn victims, which may be caused by carbon monoxide, traumatic shock, or head injury, in addition to potential cyanide toxicity. A serum lactate measurement and EtCO2 monitoring may provide useful information when determining management of these patients and should be performed if cyanide poisoning is a possibility. Cyanide toxicity poisons mitochondria forcing cells to use anaerobic metabolism. This results in a lactic acidosis and a compensatory drop in EtCO2. (See “Cyanide poisoning”, section on ‘Diagnosis’.)
We suggest treatment for cyanide toxicity to be initiated in severe burn victims with an unexplained lactic acidosis or a low or declining EtCO2level. If these measurements are unavailable, we suggest treatment be initiated in any patient demonstrating a depressed level of consciousness, cardiac arrest, or cardiac decompensation. Particularly with severe burn victims, we strongly prefer hydroxocobalamin to alternative cyanide antidotes. (See “Cyanide poisoning”, section on ‘Management’.)
Treatments — Supplemental oxygen and airway protection are the cornerstones of treatment for inhalation injury. Patients with severe burns often require tracheal intubation. (See ‘Assessment and approach’ above.)
Bronchodilators (eg, albuterol) can be useful when bronchospasm is present. Corticosteroids, however, have been associated with an increased risk of bacterial infection and should not be used .
Although fluid resuscitation is critically important in managing patients with significant burns, fluid status should be closely monitored in order to avoid overhydration and possible exacerbation of pulmonary edema. Some researchers have questioned the association between fluid resuscitation volumes and pulmonary edema . (See ‘Fluid resuscitation’ below.)
Should mechanical ventilation be necessary, institution of low tidal volume ventilation to minimize airway pressures reduces the incidence of ventilator-associated lung injury and improves outcome . Clinician tolerance of some degree of respiratory acidosis (so-called permissive hypercapnia) may be required to achieve lower airway pressures. Other ventilatory strategies, such as high frequency percussive ventilation and high-frequency oscillatory ventilation may be useful, but are not well studied in burn patients [11-14]. (See “Mechanical ventilation of adults in acute respiratory distress syndrome” and “High-frequency ventilation in adults”.)
Treatments that may be helpful but need further study include inhaled nitric oxide to treat hypoxic vasoconstriction and aerosolized heparin and N-acetylcysteine (NAC) to remove bronchopulmonary casts [15-17]. As an example, in a small single-center, nonrandomized trial, pediatric burn victims with inhalation injury (confirmed by bronchoscopy) treated with aerosolized heparin and NAC experienced reduced reintubation rates, prevalence of atelectasis, and mortality compared with historical controls . (See “Overview of the management of the severely burned patient” and “Overview of inpatient management in the adult trauma patient”.)
Approach to resuscitation — Burn shock during the initial 24 to 48 hours following major burns is characterized by myocardial depression and increased capillary permeability resulting in large fluid shifts and depletion of intravascular volume [19-21]. Rapid, aggressive fluid resuscitation to reconstitute intravascular volume and thereby maintain end-organ perfusion is crucial. Delays in fluid resuscitation and inadequate resuscitation are associated with increased mortality [22-24]. Arterial lines are often used to monitor blood pressure; urine output is used to determine the adequacy of fluid resuscitation (see ‘Monitoring fluid status’ below).
Over-resuscitation can be problematic and has been associated with multiple morbidities, including acute respiratory distress syndrome, pneumonia, multiorgan failure, and abdominal, extremity, and orbital compartment syndromes [25-27]. A survey of burn centers reported that initial fluid resuscitation exceeded recommended amounts in 58 percent of patients . This reinforces the importance of calculating fluid resuscitation needs carefully and of continually adjusting resuscitation efforts according to the physiologic response. (See “Abdominal compartment syndrome in adults” and “Acute compartment syndrome of the extremities”.)
According to the American Burn Association’s practice guidelines, any patient with greater than 15 percent total body surface area (TBSA) nonsuperficial burns should receive formal fluid resuscitation . Patients with major burns should have two large-bore intravenous (IV) lines placed through unburned skin, if possible, and may require central venous access. IV lines can be placed through burned tissue if necessary to avoid delays in resuscitation. The classification of burns is described in the accompanying figures and discussed in detail separately (figure 1and table 2). (See “Classification of burn injury”.)
Initial fluid selection — Initial fluid resuscitation of the patient with moderate or severe burns consists of an intravenous crystalloid solution, typically lactated Ringer’s (LR) solution. LR contains physiologic concentrations of major electrolytes, and lactate may reduce the incidence of hyperchloremic acidosis that can occur with administration of large volumes of isotonic saline (ie, 0.9 percent sodium chloride). Hartmann’s solution, another isotonic solution that differs slightly from LR in its concentrations of lactate and electrolytes, is also used.
The use of colloids or hypertonic saline during initial resuscitation is controversial. No differences in mortality were identified in a systematic review that included metaanalyses comparing crystalloids with: albumin or plasma protein fraction, hydroxyethylstarch, and modified gelatin . Similarly, no mortality differences were identified for hypertonic compared with isotonic crystalloid. However, among 25 trials, hydroxyethyl starch increased the risk of death compared with crystalloid (risk ratio 1.10, 95% CI 1.02 to 1.19). In a separate systematic review, in a metaanalysis of four trials, mean load (volume [mL]/percent TBSA/weight [kg]) 24 hours following burn injury was lower for hyperosmotic fluid compared with isosmotic fluid (LR) without altering renal function or mortality . The hyperosmotic fluids included hypertonic saline, or LR plus albumin, fresh frozen plasma or hydroxyethyl starch. Additional trials are needed to determine whether any of the hyperosmotic fluids result in better outcomes than the others. (See “Treatment of deep burns”, section on ‘Ongoing fluid therapy’.)
Following initial resuscitation efforts, IV fluids are given to meet baseline fluid needs and maintain urine output (0.5 mL/kg per hour). Any change to the infusion rate is made as gradually as possible . Should urine output fall below or other clinical parameters suggest inadequate resuscitation, additional fluid is infused. In such a circumstance, a bolus of IV crystalloid (approximately 500 to 1000 mL) is given and the infusion of crystalloid increased by approximately 20 to 30 percent. While adequate fluid resuscitation is crucial, care should be taken not to over-resuscitate. If adequate resuscitation has been achieved and the patient is stabilized, the crystalloid solution can be changed to 5 percent dextrose in one-half isotonic saline (ie, 0.45 percent sodium chloride) with 20 mEq of potassium chloride per liter given at a maintenance rate to keep urine output at or above 0.5 mL/kg per hour. Clinicians should continue to monitor the patient’s fluid status closely.
Enteral resuscitation may be a useful treatment for burn shock patients when IV therapy is unavailable, such as with large scale disasters. The World Health Organization (WHO) Oral Rehydration Solution (ORS) has been used successfully to resuscitate animals with 40 percent TBSA burns . No human studies have been performed to validate this approach. Information about how to make ORS can be found on the WHO website (www.who.int/en/).
Estimating initial fluid requirements — No formula provides a precise method for determining the burn victim’s fluid requirements; the formulas described here provide only a starting point and guide to initial fluid resuscitation . Such factors as patient age, severity of burn, associated injury, and comorbidities can substantially alter the actual fluid requirements of individual patients. As an example, patients with inhalation injury require greater resuscitation volumes than those without [33,34]. Therefore, adjustments to estimate fluid needs must be made based upon a burn patient’s physiologic response to resuscitation. (See ‘Monitoring fluid status’ below.)
Either the Parkland or the modified Brooke formula is a reasonable starting point for determining fluid requirements in adult patients. The Parkland (also known as Baxter) formula is the most widely used guide to initial resuscitation fluid needs in the burn patient, although some studies have questioned its accuracy [35,36]. According to this formula, the fluid requirement during the initial 24 hours of treatment is 4 mL/kgof body weight for each percent of TBSA burned, given IV (calculator 1) . Superficial (epidermal) burns (table 2) are excluded from this calculation. One-half of the calculated fluid need is given in the first eight hours, and the remaining half is given over the subsequent 16 hours. The rate of infusion for IV resuscitation fluid should be as constant as possible; sharp decreases in infusion rates can lead to vascular collapse and an increase in edema .
In addition to calculators (like the one above), a nomogram has been developed to help clinicians rapidly determine fluid requirements according to the Parkland formula . A table with the nomogram and instructions for its use is provided (figure 2).
One alternative to Parkland is the modified Brooke formula, according to which the fluid requirement during the initial 24 hours of treatment is 2 mL/kg of body weight for each percent of TBSA burned, given IV. According to one retrospective review, use of the modified Brooke formula may reduce the total volume used in fluid resuscitation without causing harm .
Another alternative method for estimating initial fluid requirements in adults with severe burns is the Rule of Tens [39,40]. This simple method involves two or three steps, depending on patient size:
●Estimate burn area (TBSA) to the nearest 10 percent.
●Multiply the percent TBSA x 10 – The result gives the initial fluid rate in mL/hour for adults weighing 40 to 80 kg.
●For patients who weigh more than 80 kg, increase the rate by 100 mL/hour for every additional 10 kg of body weight.
Children require maintenance fluid in addition to calculated fluid resuscitation volumes, and also need dextrose in the resuscitation fluid. The Galveston formula may allow for more accurate calculation of the initial fluid resuscitation children require. It is discussed separately. (See “Emergency care of moderate and severe thermal burns in children”, section on ‘Fluid resuscitation’.)
Monitoring fluid status — Confirming the adequacy of resuscitation is more important than strict adherence to Parkland or any fluid resuscitation formula. Monitoring urine output using an indwelling bladder catheter (eg, Foley catheter) is a readily available means of assessing fluid resuscitation. Hourly urine output should be maintained at 0.5 mL/kg/hr in adults. Patients with minimal or no urine output after sustaining severe burns, despite appropriate fluid resuscitation, generally do not survive.
Clinical signs of volume status, such as heart rate, blood pressure, pulse pressure, distal pulses, capillary refill, and color and turgor of uninjured skin are monitored every hour for the first 24 hours. Inadequate fluid resuscitation is the most common cause of diminished distal pulses in the newly burned patient .
Another potential cause of diminished pulses is peripheral edema, which develops in many severe burn patients due to the large fluid volumes needed for resuscitation. As edema increases, elevated compartment pressures can compromise distal circulation and may require escharotomy. (See ‘Escharotomy’ below.)
Specific laboratory measurements such as mixed venous blood gas and serum lactate concentration are additional important guides to the adequacy of resuscitation . A decrease in mixed venous oxygen saturation and an increase in serum lactate suggest inadequate end-organ perfusion (elevated serum lactate can also occur with carbon monoxide or cyanide poisoning). (See “Carbon monoxide poisoning” and “Cyanide poisoning”.)
If available, invasive monitoring, such as central venous pressure, may be useful for monitoring fluid resuscitation, but it is generally not used in acute burn management. The American Thoracic Society (ATS) consensus conference report for the detection, correction, and prevention of tissue hypoxia, as well as other ATS guidelines, can be accessed through the ATS web site at www.thoracic.org/statements.
Care should be taken not to give excess IV fluid beyond what is needed as this may exacerbate pulmonary edema, a common problem among burn victims. However, some researchers have questioned the association between fluid resuscitation volumes and pulmonary edema . (See “Treatment of hypovolemia or hypovolemic shock in adults”.)
New technologies to guide fluid resuscitation are being developed, but require further study before widespread implementation can be recommended [41-44]. Esophageal echo-Doppler and cardiac output monitoring are being studied with the goal of developing less invasive means of assessing the adequacy of fluid resuscitation in patients with severe burns. Other approaches being studied include Doppler ultrasound measurement of renal perfusion and computer-guided infusions based upon urine output.
Blood transfusion — Although evidence is limited, blood transfusions have been associated with increased mortality in patients with severe thermal burns, and we suggest that aggressive transfusion be avoided [45-47]. For patients not at significant risk for an acute coronary syndrome (ACS), we suggest transfusing patients with two units of packed red blood cells only if the hemoglobin falls below 8 g/dL; for patients at risk for ACS, we suggest a transfusion threshold of 10 g/dL. Transfusion of the trauma patient with severe hemorrhage is discussed separately. (See “Initial management of moderate to severe hemorrhage in the adult trauma patient”.)
Hemoconcentration occurs during the first several hours immediately following a severe burn and transfusions are generally unnecessary. Thereafter, bone marrow function is depressed and transfusions may be needed. Erythropoietin has not been shown to prevent anemia or decrease transfusion requirements and is not in general use at burn centers .
Immediate burn care and cooling — Any hot or burned clothing, jewelry, and obvious debris should immediately be removed to prevent further injury and to enable accurate assessment of the extent of burns (caretakers should take precautions to avoid injuring themselves when removing such material).
Burned areas should be cooled immediately using cool water or saline soaked gauze. For small and moderate sized burns, cooling can minimize the zone of injury. Multiple studies have investigated optimal burn cooling, with durations from 15 minutes to three hours [48-50]. We generally apply saline-soaked gauzes, at a temperature of approximately 12°C, for 15 to 30 minutes. Cooling tissue to around 12°C (54°F) during the first several hours after injury effectively decreases pain from burns; ice and freezing should be avoided to prevent frostbite, systemic hypothermia, and extension of burn injury.
Core body temperature is continuously monitored while cooling is performed to help prevent hypothermia, especially when dealing with burns greater than 10 percent TBSA; body temperature below 35°C (95°F) should be avoided [51,52]. Warmed IV fluids can be used to maintain core body temperature. (See ‘Fluid resuscitation’ above and “Accidental hypothermia in adults”.)
Pain and anxiety management — Partial-thickness burns in particular can be excruciatingly painful. IV morphine has been the mainstay of pain management for patients with significant burns. These patients may require extremely large doses of IV morphine or other opioids. It is reasonable to give patients with significant burns benzodiazepines given the anxiety associated with these injuries. The treatment of pain and anxiety in critically ill and burn patients is discussed in detail separately. (See “Management of burn wound pain and itching” and “Pain control in the critically ill adult patient”.)
SECONDARY SURVEY AND MANAGEMENT — After the primary survey and initial resuscitation measures are performed, a detailed secondary survey, including a thorough physical examination and the management steps listed below, should be undertaken. Injuries commonly missed in the secondary survey include corneal abrasions and perineal wounds. The secondary survey is discussed in greater detail separately. (See “Initial management of trauma in adults”, section on ‘Secondary evaluation’.)
Laboratory studies and monitoring — Ongoing pulse oximetry and cardiac monitoring are performed for all patients with significant thermal burns. Routine laboratory studies obtained in such patients generally include: complete blood count, electrolytes, blood urea nitrogen, creatinine, glucose, venous blood gas (VBG), and carboxyhemoglobin. Arterial blood gas (ABG), chest radiograph, and an electrocardiogram (ECG) are obtained in any patient at risk for inhalation injury. A cyanide level may be helpful, particularly in the setting of unexplained severe lactic acidosis. (See “Cyanide poisoning” and “Inhalation injury from heat, smoke, or chemical irritants”.)
A blood type and cross-match is obtained for any victim of significant trauma in anticipation of the need for transfusion. Other laboratory studies that may be useful in assessing muscle, cardiac, or end-organ injury include urine myoglobin, serum creatine kinase, and serum lactate. The VBG is a useful tool for assessing shock and the adequacy of resuscitation . Findings from VBG analysis, including base deficit, correlate with ABGs . (See “Initial management of trauma in adults” and “Clinical manifestations and diagnosis of rhabdomyolysis” and “Prevention and treatment of heme pigment-induced acute kidney injury”.)
Chemoprophylaxis — Patients with extensive burns are considered to be immunosuppressed on the basis of altered neutrophil activity, T lymphocyte dysfunction, and imbalance in the production of cytokines [55-57]. Bacterial colonization of the burn eschar site can result. The burn also destroys the physical barrier to tissue invasion, which permits spread of the bacteria to the dermis and through the lymphatics along fibrous septae. Once invasion occurs, organisms can proliferate, especially in necrotic tissue, and can invade blood vessels producing a secondary bacteremia. Therefore, prophylaxis against infection with topical antibiotics is given to all patients with nonsuperficial burns.
Tetanus — Tetanus immunization should be updated if necessary for any burns deeper than superficial-thickness. Tetanus immune globulinshould be given to patients who have not received a complete primary immunization (table 3) . (See “Tetanus-diphtheria toxoid vaccination in adults” and “Tetanus”.)
Antibiotics — Topical antibiotics are applied to all nonsuperficial burns. If the patient is immediately transferred to a burn center, burns are covered with clean, dry dressings and antibiotics are applied at the burn center. Treatment can be started in the emergency department (ED) if, for example, delays in transferring the patient to a burn center are anticipated. The best treatment of blistered burns is unclear. We apply topical antibiotics to partial thickness burns with intact blisters. Topical chemoprophylaxis is typically continued until wound epithelialization is complete. Prophylactic intravenous (IV) antibiotics are not typically given [59,60].
Selection of the topical antibiotic should be made in consultation with the burn center or admitting team, if treatment is begun in the ED. Classically, silver sulfadiazine (SSD) is used to prevent infection; it should be avoided near the eyes or mouth in those with sulfonamide hypersensitivity and in pregnant women, newborns, and nursing mothers. Bacitracin is a good alternative topical antibiotic in these individuals. Triple antibiotics (eg, polymyxin B, neomycin) can also be used. Because of decreased cost, many favor bacitracin. Topical antibiotic treatment is discussed in detail separately. (See “Topical agents and dressings for local burn wound care”, section on ‘Antimicrobial agents’.)
Wound management — Burn wounds should be cleaned. Embedded bits of clothing or other materials are removed by copious irrigation. Tar and asphalt can be removed with a mixture of cool water and mineral oil but should not be debrided. Copious amounts of polymyxin-B bacitracin zinc ointment (polysporin) applied for several days will emulsify residual tar. Management of tar and asphalt is discussed separately. (See “Topical chemical burns”, section on ‘Tar and asphalt’.)
Some providers clean burns using skin disinfectants (eg, Hibiclens, Betadine), but such disinfectants can inhibit the healing process and are discouraged. There is growing support for washing the wound using only mild soap and water [2,61-64]. The cleaning and debridement of burn wounds are discussed separately.
In addition to IV opioids, local or regional anesthesia can be used prior to wound care in patients with excruciating pain. However, injection directly into the wound or topical application should be avoided . (See ‘Pain and anxiety management’ above.)
Ruptured blisters should be removed, but the management of clean, intact blisters is controversial. Needle aspiration of blisters should neverbe performed as this increases the risk of infection. Burn blisters are discussed separately. (See “Treatment of superficial burns requiring hospital admission”, section on ‘Burn blisters’.)
Wound dressings — Patients rapidly transferred to a burn center can be wrapped in a clean dry sheet and do not require any additional dressing. Otherwise, all partial and full-thickness burns should have dressings.
A fine, nonadherent, mesh gauze (eg, Telfa) typically is applied, after the burn is cleansed and a thin layer of topical antibiotic is applied. Circulatory impairment is minimized by applying this nonadherent dressing in successive strips rather than wrapping it around the wound . The dressing is held in place using either a tubular net bandage or gauze wraps lightly applied. The following video clips show a basic burn dressing being applied in the operating room: (movie 1).
Deep wounds may require biologic or biosynthetic dressings or bismuth-impregnated petroleum gauze. Burn dressings are discussed separately. (See “Topical agents and dressings for local burn wound care”, section on ‘Dressings’.)
Escharotomy — With deep dermal and full thickness burns, the dermis can become stiff and unyielding, and this tissue is referred to as an eschar (picture 1). Incision of an eschar (ie, escharotomy) may be necessary to preserve respiratory function or prevent ischemia [19,66,67]. Ideally, escharotomy is performed by a physician experienced with the procedure to avoid damage to underlying structures, but on rare occasions a clinician caring for a patient with severe burns who lacks such experience may need to perform the procedure, possibly prior to transferring the patient to a burn center or higher level of care . Drawings showing the approximate lines of incision used for escharotomy are provided (figure 3 and figure 4 and figure 5).
Escharotomy of the neck or chest may be required if mechanical constriction from eschar prevents adequate chest excursion and compromises respiration. An adequate chest escharotomy should lead to clinically meaningful improvements in respiration (picture 2).
Patients with circumferential abdominal burns can occasionally develop intra-abdominal hypertension, possibly leading to abdominal compartment syndrome. These conditions are best treated in a designated burn center. (See “Abdominal compartment syndrome in adults”.)
Decompressive escharotomy of an extremity may be required for circumferential full-thickness burns, if eschar and underlying edema cause distal ischemia (picture 3 and picture 1). Although a number of parameters exist to guide the timing of extremity escharotomies, most often the decision is made clinically based upon the presence of constrictive wounds and compromised distal perfusion. Constrictive swelling does not occur until fluid resuscitation is underway (typically a minimum of three to four hours is needed), and escharotomy is rarely required in the immediate aftermath of a burn. If transfer of a patient with severe or circumferential burns is delayed, extremities should be reassessed to determine whether escharotomies are needed prior to departure to ensure continued distal perfusion. Assessment of distal perfusion may include examination of capillary refill, distal pulses (by palpation or Doppler ultrasound), skin temperature, tissue pliability, and pulse oximetry. Pulse oximetry above 90 percent suggests there is adequate distal perfusion and no need for escharotomy .
Escharotomy incisions may be performed with coagulation electrocautery, which causes less bleeding, or a scalpel. Extremity incisions should extend through the eschar to the fatty tissue just beneath, but no further; fascia should be left intact. Adequate incisions should improve distal circulation. If perfusion fails to improve after the procedure, the clinician should reassess the escharotomy depth and location, and any incisions deemed insufficiently deep should be re-incised. If the escharotomy is adequate but perfusion remains poor, elevated compartment pressures may be contributing and should be measured. Guidance from a burn surgeon by phone can be helpful.
Clinicians should keep in mind the distinction between escharotomy, an incision through the eschar only, and fasciotomy, which involves incisions through all involved fascial layers and is performed to treat acute compartment syndrome (ACS) of the extremities. Patients with significant burns may develop ACS, requiring fasciotomy, which is discussed separately. Potential complications from extremity escharotomies include bleeding and injury of the brachial artery, saphenous vein, ulnar nerve at the elbow, superficial peroneal nerve at the knee, and the neurovascular bundles and extensors of the digits . (See “Acute compartment syndrome of the extremities” and “Lower extremity fasciotomy techniques”.)
Gastrointestinal interventions — Shock from thermal burn injuries results in mesenteric vasoconstriction predisposing to gastric distension, ulceration (so-called Curling’s ulcer), and aspiration. Therefore, a nasogastric tube should be placed in patients with moderate or severe burns >20 percent TBSA . High-risk patients receive medication to reduce gastric acid secretion, but this is usually initiated after admission. (See “Stress ulcer prophylaxis in the intensive care unit”.)
Although generally not begun in the ED, early enteral feedings (ie, within 24 hours of injury) to meet basic patient energy needs attenuate the catabolic response to burns and are associated with improved outcomes [19,71,72]. Overfeeding does not help to maintain lean body mass and is associated with fatty liver so is to be avoided . (See “Nutrition support in critically ill patients: Enteral nutrition”.)
Modulating the catabolic response — Major burns cause a hypermetabolic state that is associated with a number of harmful physiologic derangements including immunosuppression, impaired wound healing, muscle catabolism, and hepatic dysfunction. A number of treatments are used to attenuate this hypermetabolic state. These treatments are generally initiated in the intensive care unit but may be started in the ED in close coordination with the burn team that will be assuming care of the patient. (See “Hypermetabolic response to severe burn injury”.)
DISPOSITION — Patients who meet the American Burn Association’s (ABA) criteria for major burns should be transferred to a burn center (table 1). Patients with moderate burns should be admitted for intravenous hydration and surgical care of their wounds.
Because of the initial difficulties in differentiating deep partial-thickness burns from full-thickness burns, clinicians should have a low threshold for consulting surgery for any patient with what appears to be a deep partial-thickness burn affecting more than 3 percent TBSA (total percentage of body surface area). An algorithm assisting with identifying and managing ambulatory burn patients is provided (algorithm 1). General guidelines for hospitalization include the following:
●Admit patients suspected of inhalation injury for observation; fiberoptic bronchoscopy or xenon ventilation perfusion scanning is useful if the diagnosis is in doubt [7,49,74,75]. Pulmonary dysfunction causes more than 75 percent of fire-related deaths [1,4,5]. Initial evaluations may be normal in patients with inhalation injury who subsequently develop severe respiratory distress. Check for carbon monoxide poisoning; treatment with hyperbaric oxygen may be necessary . Consider cyanide poisoning and provide presumptive treatment when indicated. (See ‘Airway management’ above and ‘Carbon monoxide and cyanide’ above and “Inhalation injury from heat, smoke, or chemical irritants”.)
●Admit patients with moderate to severe burns (table 1).
●Admit patients with circumferential partial or full-thickness burns.
●Patients at greater risk for development of infection of nonsuperficial wounds, such as diabetics and the elderly, generally should be hospitalized.
●Patients with a high voltage injury who have an abnormal electrocardiogram (nonspecific ST-T wave changes most commonly) are at increased risk for cardiac arrhythmias and should be observed until the ECG normalizes [49,62]. (See “Environmental and weapon-related electrical injuries”.)
MORTALITY AND ETHICS
Mortality — The chance of survival after a severe burn increased steadily in the second half of the 20th century due to a number of therapeutic developments, including vigorous fluid resuscitation, early excision of burn wounds, advances in critical care and nutrition, topical antibiotic use, and the evolution of specialized burn centers . Even among patients hospitalized for burns, survival exceeds 95 percent [78,79].
A number of studies have investigated the variables associated with increased mortality in burn patients. In one retrospective review of 1665 patients admitted to a tertiary care hospital (mean burn size 14 ±20 percent TBSA, mean age 21± 20 years), three risk factors for death were identified :
●Age greater than 60 years
●Nonsuperficial burns covering over 40 percent TBSA
The authors developed a mortality formula that predicts a 0.3, 3, 33, or 90 percent mortality depending upon whether zero, one, two, or three risk factors are present.
This study was criticized for having too few patients with three risk factors to make an accurate mortality estimate, and for having a high incidence of do not resuscitate orders among the sicker patients . In addition, mortality estimates by others who used this model have not coincided with those predicted . Nevertheless, the formula appears to provide a reasonable approximation of the risk of death in patients with severe burns.
Patient autonomy and aggressiveness of care — Although well beyond the scope of this review, the issue of patient autonomy in the setting of severe thermal injury warrants mention. Victims of severe burns face a prolonged, frequently painful period of treatment, during much of which their ability to communicate their desires will be impaired by the effects of and treatments for their injuries. Therefore, at the start of their initial resuscitation, during which many patients are lucid, it is reasonable to ask what types of care they wish and do not wish to receive . (See “Advance care planning and advance directives” and “Ethical issues in palliative care” and “Ethical considerations in effective pain management at the end of life”.)
SOCIETY GUIDELINE LINKS — Links to society and government-sponsored guidelines from selected countries and regions around the world are provided separately. (See “Society guideline links: Care of the patient with burn injury”.)
SUMMARY AND RECOMMENDATIONS — Patients with severe thermal burns are at significant risk of death and major morbidity. Proper management during their initial resuscitation reduces such risk (algorithm 1). Below are listed critical points in the initial management of patients with severe thermal injury.
●Airway, breathing, and circulation – Perform a primary trauma survey with appropriate management (algorithm 1). Look for evidence of respiratory distress and smoke inhalation injury, a common cause of death in the acute burn victim. Initial assessment may reveal no evidence of injury, but laryngeal edema can develop suddenly and unexpectedly. Aggressive airway management with early intubation is warranted if there is evidence of inhalation injury. Signs and symptoms of inhalation injury are described above. Obtain a chest radiograph, arterial blood gas, and electrocardiogram in all patients at risk for respiratory problems. (See ‘Airway management’ above and ‘Laboratory studies and monitoring’ above.)
●Burn depth and size determine fluid resuscitation and the need for transfer (table 1). They must be accurately assessed. (See “Classification of burn injury”.)
●Burn shock – Vascular collapse from burn shock is a critical component of the pathophysiologic response to severe burns. Rapid, aggressive fluid resuscitation to reconstitute intravascular volume and maintain end-organ perfusion is crucial. Fluid requirements are based initially upon a formula (eg, Parkland) and subsequently upon patient response to the initial intravenous (IV) fluids. (See ‘Fluid resuscitation’ above.)
●Initial, estimated fluid requirements – We suggest using lactated ringers for fluid resuscitation (Grade 2C). The Parkland-Baxter formula can be used to calculate initial fluid needs. According to this formula, the fluid requirement during the initial 24 hours of treatment is 4 mL/kg of body weight for each percent of TBSA burned, given IV (calculator 1). Superficial (epidermal) burns are excluded from this calculation. One-half of the calculated fluid need is given in the first eight hours, and the remaining half is given over the subsequent 16 hours. The rate of infusion for IV resuscitation fluid should be as constant as possible; rapid declines in infusion rates can lead to vascular collapse and an increase in edema. (See ‘Estimating initial fluid requirements’ above.)
●Monitoring fluid status – Monitor urine output using an indwelling bladder catheter (eg, Foley catheter). Hourly urine output should be maintained at 0.5 mL/kg in adults. Clinical signs of volume status, such as heart rate, blood pressure, pulse pressure, distal pulses, capillary refill, and color and turgor of uninjured skin are monitored every hour for the first 24 hours. Inadequate fluid resuscitation is the most common cause of diminished distal pulses in the newly burned patient. A decrease in mixed venous oxygen saturation and an increase in serum lactate suggest inadequate end-organ perfusion. (See ‘Monitoring fluid status’ above.)
●Carbon monoxide and cyanide – Burn patients may be exposed to carbon monoxide, requiring immediate treatment with high-flow oxygen (and possibly hyperbaric oxygen), and cyanide, requiring antidotal therapy. (See ‘Carbon monoxide and cyanide’ above.)
●Wound care – Cool and clean wounds, but avoid inducing hypothermia in this process. Mild soap and water is suitable. Monitor the patient’s core temperature continually. Remove any jewelry and any hot or burned clothing and obvious debris not densely adherent to the skin. Irrigation with cool water may be used. Topical antibiotics are applied to all nonsuperficial burns. If the patient is immediately transferred to a burn center, burns are covered with clean, dry dressings and antibiotics are applied at the burn center. There is no role for prophylactic IV antibiotics. (See ‘Wound management’ above.)
●Pain control and additional interventions – Give opioids (eg, morphine) to treat pain and give tetanus prophylaxis. Extremely high doses of opioids may be required. Benzodiazepines can help relieve anxiety. (See ‘Chemoprophylaxis’ above.)
●Coordination with burn team – Emergency clinicians should coordinate patient care closely with either the admitting or, in the case of transfer, with the accepting burn team. A number of additional medications may be of benefit, but most are begun after the patient has left the emergency department. We institute glycemic control using an insulin drip as early as possible. Additional treatments to minimize the catabolic response should be initiated in close consultation with the burn team that will assume care of the patient. (See ‘Modulating the catabolic response’ above and ‘Gastrointestinal interventions’ above.)
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