Burn shock pathophysiology

Overview

Burn shock is the early circulatory collapse that follows a major thermal injury. Thermal energy cannot be removed once delivered, so the injury continues to drive physiology long after the burn itself stops ^[2]. A major burn produces arguably the most severe perturbations in physiology a patient can survive, and those derangements begin immediately ^[425]. Before clinicians understood the role of aggressive volume replacement, early death from burn shock was common ^[212].

The core problem is a loss of effective circulating volume. After a large burn, both local and systemic vascular permeability increase, intravascular fluid extravasates, effective circulation falls, systemic vascular resistance rises, cardiac output drops, and peripheral edema accumulates ^[468]. This is a combined process: patients are hypovolemic from volume loss and distributive from a profound inflammatory cascade ^[469]. The shock becomes evident within the first 24 hours and is best understood as hypovolemic-distributive, because tissue perfusion and oxygen delivery are compromised by capillary leakage that shifts fluid from the intravascular to the interstitial space ^[469].

Understanding this pathophysiology is the foundation for everything that follows in the first 24 to 48 hours. It explains why burns need large-volume resuscitation, why over-resuscitation (fluid creep) happens, and why complications such as compartment syndromes arise from the edema itself. Better understanding of these responses has improved outcomes over the past decades ^[371].

Epidemiology

Shock is one of the most common complications and one of the leading causes of death after severe burns ^[472]. Even in the modern era, burn trauma still carries a 3% to 8% mortality, and 58% of deaths occur within the first 72 hours, marking the initial burn shock period as a major contributor to burn mortality ^[433]. In children, most burns are minor, but a significant number sustain injuries greater than 15% total body surface area (TBSA), which initiates the systemic inflammatory response ^[441].

The systemic threshold matters. Burns covering more than 10% of TBSA produce systemic perturbations that can become life-threatening, and fluid and electrolyte changes leading to burn shock have the most dramatic consequences ^[290]. Local injuries involving less than 20% TBSA rarely cause systemic illness, whereas severe burns above 20% to 30% TBSA produce the metabolic derangements that require intensive management ^[393]. Myocardial damage is common in this population and scales with burn size: incidence rose from 38.2% in patients under 50% TBSA to 61.0% in those at or above 80% TBSA in one retrospective series ^[431]. Acute mesenteric ischemia, while rarer, occurred in 5% of 282 severely burned patients and carried a 93% 90-day mortality ^[449].

Pathophysiology

Loss of effective circulating volume

The essence of burn shock is the rapid and extensive transfer of fluid in burned and non-burned tissue ^[468]. After severe burns, local and systemic vascular permeability rise, intravascular fluid extravasates, and effective circulating volume progressively declines, with a rise in systemic vascular resistance and a fall in cardiac output ^[468]. Massive thermal injury is characterized by hypovolemic shock from the loss of plasma out of the vessels ^[352]. Functional extracellular fluid volume is the determinant of early circulatory status: in the first 24 to 30 hours after burn, hemodynamics correlate closely with maintenance of that functional volume, and after that window circulatory status becomes largely uncoupled from fluid administration ^[3].

The result is a characteristic clinical picture. Mediator release produces hypovolemia with hemoconcentration, hyponatremia, hypoalbuminemia, systemic vasoconstriction, and myocardial dysfunction ^[298]. From the standpoint of reduced effective circulating volume, burn shock is a hypovolemic shock, grouping it with hemorrhagic shock and distinguishing it from the vasodilatory shocks such as septic and anaphylactic shock ^[472]. Elevated hematocrit reflects the serious leakage of intravascular fluid to the body surface and interstitial spaces in the early stage ^[472].

Capillary leak and edema formation

Increased microvascular permeability is the central lesion. Fluid is lost from the circulation into burned tissue because of a moderate increase in capillary permeability to fluid and macromolecules together with a modest rise in microvascular hydrostatic pressure ^[174]. Edema, however, is not driven by permeability alone. A profoundly negative interstitial pressure develops in thermally injured skin, acting as a strong suction that adds to the edema-generating effect of increased permeability and pressure ^[174]. Dermal interstitial fluid pressure falls to roughly -35 to -41 mmHg within 10 to 15 minutes of burn before returning toward baseline ^[300]. The pathogenesis involves changes in most of the physical forces governing fluid flux across the capillary, with increased permeability to protein being only one component ^[331].

Edema is generalized, not local. Thermal injuries beyond 20% TBSA produce systemic shock with generalized edema in addition to local tissue destruction ^[355]. A striking experimental insight is that the burned tissue is no longer required to sustain burn shock: transferring plasma from a burned animal to a healthy one induces the same systemic capillary leak, even when the plasma is diluted to 1% in 0.9% saline, and the process becomes self-perpetuating as early as 4 hours after injury ^[355]. Edema in unburned tissue is a common complication after resuscitation, and tissue water content in peripheral and visceral organs rises by 8 hours after injury ^[282]. Edema volume peaks around day 1 in an unresuscitated burn and around day 2 once fluid is given, then tapers to insignificant change after day 4 ^[432]. The fluid is high-protein, exceeding 10 g/L, and more than 98% of the edema content is fluid ^[432].

Inflammatory mediators

Burn shock is mediated by a complex inflammatory response ^[485]. Widespread skin destruction creates a large necrotic mass and breaks the skin barrier, releasing endothelin, histamine, bradykinin, serotonin, catecholamines, vasopressin, prostaglandins, cytokines, and nitric oxide in large quantities, which act both locally and at a distance ^[298]. Changes in histamine, bradykinin, and cytokines such as vascular endothelial growth factor, metabolic factors such as ATP, and activated neutrophils all increase vascular permeability ^[468]. The endocrine disorder and cytokine storm release kinins including histamine, serotonin, and bradykinin alongside thromboxanes, prostacyclins, prostaglandins, and leukotrienes ^[388].

Thermal injury induces a two-phase response: a pro-inflammatory phase producing the systemic inflammatory response, followed by an anti-inflammatory phase with depressed cell-mediated immunity ^[384]. Damage-associated molecular patterns regulate immune-cell activation and cytokine production ^[469]. Several mediators have been studied as potential permeability drivers. Thromboxane A2 and the thromboxane-to-prostacyclin ratio rise in burn shock and appear to play an important role in hemodynamic and rheologic disturbance ^[149]. Nitric oxide, generated by nitric oxide synthase, has been implicated in the inflammatory response after cutaneous burn, and dysregulated NOS activity is associated with multiple organ failure ^[313]. The case for histamine as a dominant mediator is weaker: one human study found only a small increase in histamine excretion and no increase in its metabolite, and the authors concluded their findings do not support histamine as an important mediator of the systemic permeability seen after burn ^[391].

Endothelial injury and the glycocalyx

A major recent advance is the recognition of burn endotheliopathy, injury to the endothelial glycocalyx layer, as central to burn shock pathophysiology ^[473]. Thermal injury results in endothelial dysfunction, the endotheliopathy of burns, and plasma normally stabilizes the endothelium ^[450]. Shedding of syndecan-1 from the glycocalyx, the endotheliopathy of trauma, is associated with poorer outcomes, and burn injury induces shedding similar to that in non-burn trauma patients with comparable higher mortality ^[455]. Neutrophil-derived heparin binding protein and myeloperoxidase rise rapidly after severe burn; increased heparin binding protein triggers vascular leakage in synergy with myeloperoxidase, producing systemic edema and burn shock, and the myeloperoxidase product hypochlorous acid sheds CD44 from endothelial cells to damage the glycocalyx ^[470].

At the cellular level, circulating factors trigger endothelial contraction and barrier dysfunction. Burn plasma promotes increases in endothelial monolayer permeability, with higher syndecan-1 levels in plasmas that induce greater permeability ^[479]. Damage to the endothelial adherens junction complex plays an integral role, mediated in part by matrix metalloproteinase-9 ^[408]. Endothelial junctions widen and gaps form as a response to inflammation ^[411], and myosin light chain phosphorylation drives an endothelial contractile response that serves as an end-point effector of barrier dysfunction ^[312]. The p38 MAPK pathway is repeatedly implicated: blocking p38 lowers venular hyperpermeability and improves survival in burned animals ^[378]. More recently, NLRP3 inflammasome activation has been linked to endothelial pyroptosis and barrier dysfunction in burn injury ^[484].

Myocardial depression

Cardiac dysfunction is an early and intrinsic feature, not merely a consequence of low preload. Myocardial damage and cardiac dysfunction occur immediately after severe burn, even before significant blood-volume reduction from increased capillary permeability, and this cardiac deficiency is itself a precipitating factor for burn shock ^[430]. In animal models, myocardial blood flow falls and contractility drops within minutes of injury, and this myocardial damage may help drive the decline in blood flow to other organs ^[380]. Serum cardiac troponin I rises within hours and peaks around 12 hours after injury ^[407].

Multiple mechanisms contribute. Burn trauma activates stress-responsive pathways through sympathetic activity, regulating myocardial TNF-alpha and culminating in contractile and relaxation defects ^[303]. Burn-induced cytokines, including IL-1-beta, IL-6, and TNF-alpha, negatively affect cardiac function, with decreased sarcomere shortening after burn ^[341]. Gut-derived myocardial depressant factors transported in mesenteric lymph also contribute, because pre-burn mesenteric lymph duct ligation abrogates burn-induced cardiac dysfunction ^[304]. Hemodynamics are dynamic over time, transitioning from low cardiac output with high vascular resistance in early shock to high output with low resistance during edema reabsorption ^[438].

Microcirculatory and distant-organ effects

Burn shock disrupts the microcirculation even when macrocirculatory targets are met. Microcirculatory dysfunction is an important pathophysiologic change, involving glycocalyx damage, macrocirculation-microcirculation decoupling, and vascular hyporeactivity ^[474]. Microcirculatory alterations are identified in severely burned patients even when macrocirculatory variables sit within therapeutic goals ^[434]. Stabilizing macrohemodynamic conditions does not necessarily reverse microcirculatory derangement ^[435].

Distant organs are injured by the same processes. Gut barrier function is impaired within minutes of burn and worsens by 4 hours, and increased gut permeability promotes bacterial translocation ^[383]. Angiotensin II is a primary mediator of postburn mesenteric vasoconstriction, and burn reduces mesenteric blood flow to roughly 58% of baseline ^[277]. In the lung, combined burn and smoke injury augments pulmonary microvascular permeability to fluid ^[289], while several models implicate TNF-alpha and neutrophils in burn-induced lung injury ^[301]. Burn also increases blood-brain barrier permeability through both paracellular and transcellular routes ^[460]. Oxidative stress is a unifying thread: local and systemic lipid peroxidation occurs in burn, and neutrophil hyperactivation contributes to oxidative cell and tissue damage that may initiate the organ dysfunction accompanying burn shock ^[260][186].

Coagulation and fibrinolytic changes

Burn shock perturbs hemostasis early. Fibrinolytic dysfunction and endotheliopathy develop in up to 40% of patients during the first hours after thermal injury and associate with poor outcomes and increased resuscitation requirements ^[482]. The fibrinolytic system activates rapidly, generally more so with greater injury severity, and very high plasmin-antiplasmin complex concentrations have been associated with mortality ^[482]. Patients display hyperfibrinolytic, physiologic, or hypofibrinolytic phenotypes by viscoelastic assay, and these phenotypes shift in over half of patients during the acute resuscitation period, with maladaptive patterns associated with higher mortality ^[482]. Microvascular thrombosis also appears in the burn wound itself, where neutrophil extracellular traps coincide with a procoagulant endothelial phenotype ^[440].

Assessment

Assessment in burn shock is challenging because conventional global indices can mislead. Traditional markers such as blood pressure, urinary output, and cardiac output are helpful but do not sufficiently reflect perfusion and oxygenation at the microcirculatory level ^[434]. Persistent cellular hypoperfusion in patients deemed adequately resuscitated by global indices can produce significant organ injury, and current endpoints are best interpreted in aggregate because none independently and accurately reflects tissue perfusion ^[325].

Several monitored variables track the pathophysiology. Pulse-contour cardiac index runs below normal through the early hours while systemic vascular resistance index runs above normal, and blood lactate, initially high, declines over the first days ^[446]. Extravascular lung water index and pulmonary vascular permeability index help differentiate the type of burn-induced pulmonary edema ^[424]. Among biomarkers, elevated admission syndecan-1 reflects glycocalyx shedding but cannot by itself be extrapolated to indicate increased capillary leakage of albumin and fluid ^[464]. Early hypoalbuminemia, with an admission 4-hour albumin below 23 g/L, is associated with higher 28-day mortality ^[454]. Admission dipeptidyl peptidase-3, a proposed myocardial depressant factor, is associated with circulatory failure, acute kidney injury, and death ^[456]. Stroke volume and stroke volume variation at ICU admission are associated with survival, whereas cardiac index alone is not ^[481].

Management follows from the pathophysiology

Management in the burn shock period flows directly from the loss of effective circulating volume. Detailed resuscitation protocols, formulas, monitoring strategies, and colloid-choice debates belong to sibling pages on fluid resuscitation; what follows is the pathophysiologic rationale they rest on.

Volume restoration is the central act. Restoration of functional extracellular fluid requires greater quantities given at faster rates than originally anticipated ^[3], and fluid resuscitation is the historical mainstay for preventing burn shock and achieving initial stabilization ^[363]. Hansen and colleagues note that continuous individual titration of volume to clinical response is needed to avoid the harms of both over- and under-resuscitation ^[363]. Because the underlying lesion is endothelial, interest has grown in fluids that address the endotheliopathy directly: plasma stabilizes the endothelium, and in a rodent model early fresh frozen plasma reduced syndecan-1 shedding and dampened the cytokine response, whereas late plasma did not ^[478].

The pathophysiology also explains a paradox: the resuscitation that saves life can itself cause harm. Fluid resuscitation of burn shock is life-saving but can paradoxically increase morbidity and mortality through the unintended consequence of systemic edema formation ^[473]. Newer monitoring approaches and alternative strategies such as albumin, plasma, or high-dose ascorbic acid have had mixed results in limiting fluid creep, and clear outcome improvement remains elusive ^[473]. Where fluid creep occurs, the literature attributes it largely to excessive crystalloid administration and abandonment of colloid rather than to nursing protocol failure ^[390][394].

Complications

The complications of burn shock arise from two sources: the shock state itself and the resuscitation it requires. Burn shock, marked systemic inflammation, multiple-organ failure, infection, and wound failure are among the insults that may require intensive management ^[425]. The progressive fall in effective circulating volume with rising systemic vascular resistance and falling cardiac output can lead to multiple organ failure and death ^[468].

Over-resuscitation drives a distinct set of harms. Over-resuscitation, or fluid creep, has emerged as one of the most important problems in early burn care ^[386]. Resuscitation with large crystalloid volumes worsens burn edema, can convert superficial burns into deep ones, and causes compartment syndromes ^[369]. Capillary leak raises compartment pressures: capillary leak syndrome can elevate compartment pressures and contribute to compartment syndrome, and lower-extremity compartment syndrome has been reported even without circumferential burns ^[486]. Secondary abdominal compartment syndrome is a lethal complication of resuscitation from burn shock, and large intravenous fluid volumes decrease abdominal perfusion through rising intra-abdominal pressure ^[340]. Myocardial damage in the shock stage predicts greater decline in effective circulating volume, tissue-oxygenation disorders, and damage to other organs ^[431]. Pulmonary microvessels are especially susceptible to burn-induced inflammatory mediators, contributing to acute lung injury that is a common cause of morbidity and mortality even without inhalation injury ^[301].

Special Considerations

Inhalation injury substantially amplifies the systemic response. Combined body burn and smoke inhalation injury markedly increases mortality alongside greater generalized oxidant release and lipid peroxidation ^[186]. Smoke inhalation produces an increase in microvascular permeability and a reduction in myocardial contractility from the toxic products of smoke ^[109], and patients with inhalation injury need more resuscitation fluids and more often require mechanical ventilation ^[290]. Carbon monoxide or cyanide intoxication should be considered in any patient with a compatible history and an inadequate response to treatment, per Carleton and colleagues ^[212].

Children and electrical-injury patients warrant separate attention. Prompt resuscitation is critical in pediatric patients because of their small circulating blood volumes, and delays can increase complications and mortality ^[441]. High-voltage electrical burns increase leukocyte adhesion in mesenteric venules and reduce intestinal microcirculatory perfusion in animal models ^[437]. In austere or mass-casualty settings where intravenous therapy is delayed, enteral resuscitation has been studied as an alternative, recognizing that it mitigates secondary gut injury but has not been tested against modern intravenous resuscitation ^[381][480].

Outcomes

Outcomes in burn shock are driven by how completely effective circulating volume is restored and by the burden of secondary injury. Before aggressive volume resuscitation was understood, early mortality from burn shock was common ^[212]; with current understanding of the massive fluid shifts and vascular changes, mortality related to burn-induced hypovolemia has decreased considerably ^[173]. Mortality has improved over recent decades through better understanding of burn shock pathophysiology, surgical management, infection control, and nutritional support ^[427].

Several pathophysiologic features carry prognostic weight. Myocardial damage in severe burn is associated with higher mortality ^[431], and impaired cardiac function correlates with decreased survival ^[311]. Endotheliopathy, reflected in elevated syndecan-1, has been associated with increased mortality ^[482]. Acute mesenteric ischemia in critically ill burn patients carries a 93% 90-day mortality versus 46% without it ^[449]. The combination of large TBSA and inhalation injury elevates the risk of burn shock and multiorgan dysfunction, with significant morbidity and mortality ^[486].

Controversies and Evidence Gaps

The precise mechanism of increased capillary permeability remains incompletely defined, and effective measures for decreasing fluid leakage from vessels and preventing ischemic visceral damage are still being sought ^[405]. The relative importance of individual mediators is contested. The case for histamine as a major systemic permeability mediator is not supported by human excretion data ^[391], and the influence of leukocyte-endothelial interactions on postburn edema remains unclear ^[421].

The best resuscitation endpoint is unsettled. No conclusive evidence establishes that one formula is superior to another or that one parameter is a better predictor than another ^[387]. Excessive fluid resuscitation cannot reliably normalize cardiac output, so normal hemodynamic values cannot serve as a resuscitation endpoint ^[438]. The 2024 American Burn Association clinical practice guideline reflects this uncertainty: it states it is unable to make recommendations on high-dose vitamin C, fresh frozen plasma, early continuous renal replacement therapy, or vasopressors as adjuncts during acute burn shock resuscitation, and notes that mortality could not be formally evaluated because the literature lacks studies of sufficient size and quality ^[476].

The role of colloid and the timing of endothelial-targeted therapy are active questions. The use of albumin for plasma volume support has been described as controversial because of concern that it could aggravate interstitial edema, though one kinetic study found similar albumin leak rates in burn patients and healthy volunteers ^[457]. Plasma was historically abandoned over infectious risk, yet renewed interest follows from its capacity to stabilize the endothelium ^[450]. Whether the dominant fluid-transfer mechanism is colloidosmotic or interfacial is itself debated, with some evidence favoring interfacial transfer and collagen structural transitions ^[410].

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