Burn first aid and initial pre-hospital management

Overview¶

Burn first aid is the care delivered at the scene and in transit, before the wound reaches a hospital or burn center. It is a high-leverage window. In the United Kingdom some 250,000 burns occur annually, about 90% of which are minor and can be safely managed in primary care; even for these, Hudspith and Rayatt note that the initial care can have a considerable influence on the cosmetic outcome ^[3]. Most minor burns heal regardless of treatment, but the same review observes that early care shapes the eventual result ^[3]. The clinical content of this phase is unusually simple and unusually consequential: a small number of plain interventions, done well, change the depth of the wound and the work that follows.

Forjuoh's review of low- and middle-income country burns identified immediate application of cool water to a burned area as a core treatment, alongside the descriptive epidemiology of who is burned and how ^[1]. The corpus on first aid is dominated by cooling, by chemical irrigation, and by the recurring observation that first aid is frequently done wrong in the community. Across studies, only a minority of patients arrive having received adequate first aid: McCormack and colleagues found adequate initial first aid had been given by parents or carers in only 24 of 109 cases (22%) ^[12], and Bennett and colleagues documented that potentially harmful first aid such as food, oil, toothpaste, shampoo, or ice was applied to 5% of children in Cardiff and 10% in Denver ^[13]. The gap between what the evidence supports and what bystanders actually do is itself a recurring theme of this literature.

The structure of this page follows the clinical workflow of the first-aid phase rather than a textbook anatomy: recognize and secure the scene, cool, irrigate when the agent is chemical, manage pain and the wound, run the systematic survey, and avoid the predictable harms.

Stopping the burn and the primary survey¶

The first task is to stop the burning process. Hudspith and Rayatt list the aims of first aid as stopping the burning process, cooling the burn, providing pain relief, and covering the burn ^[3]. The heat source should be removed, and because clothing can retain heat even in a scald burn, the same review states it should be removed as soon as possible ^[3]. Adherent material such as nylon clothing should be left on rather than torn from the wound ^[3]. For flames, the review describes dousing with water or smothering with a blanket or by rolling the victim on the ground ^[3].

Securing the scene precedes treatment. Pearn frames the clinical outcome after thermal injury as significantly dependent on bystander action at the scene, where rescue or extinguishing flames may save life and best-practice first aid may reduce the need for skin grafting and modify the rate and quality of healing ^[26]. Before first aid can begin, the same author argues that rescue and control of the incident site is crucial, and describes a current rescue doctrine of four elements: assess for danger, use protection if a rescue is undertaken, train in techniques for extinguishing the flames of the burning casualty, and train in methods of physical retrieval to a safe place ^[26]. For electrical burns, Hudspith and Rayatt note the victim should be disconnected from the source of electricity before first aid is attempted ^[3].

The initial assessment of a significant burn follows the same systematic structure as any trauma. Treharne and Kay describe the initial management of burns following the ABCDE approach in common with all trauma ^[27]. The pre-hospital evidence base has been consolidated into consensus statements: Allison and Porter outline nine key steps in the pre-hospital initial management of burn patients based on available evidence and specialist consensus, with the organizing principle that simple things should always be performed well ^[25].

Cooling: the load-bearing intervention¶

Cooling is the intervention with the strongest and most consistent evidence in burn first aid. Wright and colleagues describe it as widely accepted in clinical practice and a cornerstone of basic first aid in burns, with a reduction in burn progression over the first 48 hours, reduced healing time, and some subjective improvement in scarring when cooling is administered after burning ^[8]. The evidence converges on a specific prescription. The Chai systematic review states that 20 minutes of cool running water is an effective first aid measure to improve outcomes after thermal burn ^[15], and Hudspith and Rayatt describe active cooling as removing heat and preventing burn progression, effective if performed within 20 minutes of injury, with immersion or irrigation in running tepid water continued for up to 20 minutes ^[3].

The human and clinical data behind that prescription are robust. Harish and colleagues studied 4,918 patients and defined adequate first aid as 20 minutes of cool running tap water applied up to 3 hours after injury; adequate first aid was received in 58.1% (2,859) of patients and was associated with a statistically significant reduction in burn wound depth (OR 1.39; 95% CI 1.24-1.55; P<0.001), though not with a reduction in total body surface area or grafting requirement on the primary analysis ^[4]. In the subset not requiring grafting, those who received adequate first aid healed on average 10% (HR 1.10; 95% CI 1.03-1.18; P<0.01) or 1.9 days faster ^[4]. The same cohort found adequate first aid in patients who did require grafting was associated with a 15% increase in the surface area that was not grafted ^[4]. Wright and colleagues' human burn model quantified the effect directly: cooling at 16°C for 20 minutes modified burn depth progression and salvaged, on average, 25.2 per cent of the dermal thickness ^[5]. The authors concluded that public health messaging should emphasize cooling as first aid for burns ^[5].

System-level data reinforce the signal. The bi-national Australia and New Zealand cohort reported by Wood and colleagues found that cooling reduced the probability of graft surgery and that the probability of ICU admission fell by 0.084 from 0.175 (a 48% reduction; p<0.001) while hospital length of stay fell by 2.27 days from 12.9 days (an 18% reduction; p=0.001), with all outcomes except death showing a dose-response relationship with cooling duration ^[6]. In a Vietnamese childhood case series, Nguyen and colleagues found 33% of children who had immediate cooling had deep burns versus 49% of those who had not, a prevalence ratio of 0.68 (95% CI 0.55-0.85) corresponding to an estimated 32% reduction in the need for skin grafting ^[35]. Cuttle and colleagues' animal-model work showed that immediate cold running water for 20 minutes improved re-epithelialisation over the first 2 weeks and decreased scar tissue at 6 weeks, and that as little as 10 minutes of cooling or cooling delayed up to 1 hour still provided benefit ^[9].

The temperature matters as much as the duration. Cuttle and colleagues' review of first aid treatments concluded that the recommendation should be cold running tap water between 2 and 15°C, not ice or alternative plant therapies ^[2]. Hudspith and Rayatt state explicitly that iced water should not be used because intense vasoconstriction can cause burn progression ^[3]. Running tap water also outperforms commercial alternatives in head-to-head testing: in Cho and Choi's randomized trial, the reduction of skin surface temperature by tap water was significantly greater than by two commercial cooling products, and while tap water and one spray reduced skin temperature, the gel dressing slightly increased it ^[14]. The mechanism is not solely thermal. Wright and colleagues note that intradermal temperature normalises within seconds to a few minutes, yet the benefit of even delayed cooling persists, implying the effect is not simply removal of thermal energy ^[8]; Hudspith and Rayatt add that cooling also removes noxious agents, reduces pain, and may reduce oedema by stabilising mast cells and histamine release ^[3]. Holzer and colleagues' ex-vivo model showed less necrosis and less dermal-epidermal separation in cooled areas, describing cooling as an efficient method to reduce burn wound conversion ^[31].

Chemical, electrical, and special-agent injuries¶

Chemical burns follow a different logic from thermal burns because the injuring agent persists. Chai and colleagues note that the mechanism and pathophysiology of chemical burns is distinct from thermal burns and that recommended first aid approaches are consequently different ^[15]. For chemical burns to the skin, the same review describes the recommendation as immediate water lavage for 60 minutes, removal of contaminated clothing if not stuck to the skin, and then covering the wound with a sterile dressing ^[15]; Hudspith and Rayatt similarly describe irrigation with copious amounts of water ^[3]. A later analysis by Chai and colleagues described first aid recommendations for chemical burns as copious water irrigation for 30 minutes to 2 hours after removal of the substance from skin ^[16]. The outcome data support irrigation: among 1,549 chemical burn patients, those who received in-hospital first aid had their stay reduced by about 18% compared with those who did not, and patients receiving pre-hospital or in-hospital first aid had 37% and 31% lower odds, respectively, of needing acute care surgery for wound closure ^[16]. The same analysis found water irrigation associated with shorter hospital stays and reduced acute-care surgery without an effect on intensive care admission rates ^[16].

The historical chemical-burn literature establishes the same principle. Leonard and colleagues, reporting on industrial chemical burns where all patients received copious water lavage, found that compared with the group that did not receive lavage until hospital admission, patients receiving appropriate first aid showed significantly less full-thickness injury and a more than twofold shorter hospital stay ^[7].

Hydrofluoric acid is the canonical exception that proves the rule, because water alone is insufficient. Höjer and colleagues' blind controlled experimental study concluded that water rinsing followed by topical calcium should remain the standard first aid treatment for skin exposure to hydrofluoric acid ^[17]. In that study the commercial amphoteric agent Hexafluorine scored significantly worse than topical calcium on days 2 and 3 and showed a consistent trend toward worse outcomes than either calcium or water rinsing alone ^[17].

Chemical eye burns are time-critical. Kuckelkorn and colleagues identify the speed at which initial irrigation of the eye begins as having the greatest influence on the prognosis and outcome of eye burns ^[18]. A companion report from the same group, by Langefeld and colleagues, frames eye irrigation as a widely accepted therapeutic requirement in first aid, by which the burning agent is removed, diluted, and where possible neutralized ^[36].

Pain, wound cover, and transfer¶

Analgesia is part of first aid, not a downstream concern. Boscher and colleagues describe intravenous opiates or ketamine in combination with benzodiazepines as having proven value for burn pain, restricting onsite wound management to sterile dressings ^[24]. Hudspith and Rayatt's framing of pain relief as one of the four aims of first aid places it alongside cooling rather than after it ^[3].

Wound cover is simple and deliberately non-interventional in the field. Boscher and colleagues recommend restricting onsite burn management to the application of sterile dressings ^[24]; Treharne and Kay describe dressing burns with clingfilm or plastic bags and wrapping the casualty in absorbent materials under field conditions ^[27]. The recurring principle, stated by Allison and Porter, is that simple things should always be performed well ^[25].

Transfer decisions hinge on accurate size and severity assessment, which is itself a weak link. Pham and colleagues' review of burn-size estimation found pervasive total-body-surface-area miscalculations ranging from 5% to 339% regardless of provider level, with burns under 20% disproportionately overestimated, resulting in up to 77% of burns being inappropriately transferred to burn centers from referring hospitals ^[20]. Smith and colleagues found no statistical difference between serial halving and the rule of nines as a pre-hospital assessment tool, while noting the rule of nines requires the assessor to know the proportionate areas of the body ^[22]. Thom's work supports the palm-based estimate for minor burns, finding the palm including digits represents 0.8% of total body surface area and is suitable for assessing burns under 10%, with Wallace's rule of nines advocated for larger burns ^[21].

Complications of the first-aid phase¶

The two preventable harms of this phase are hypothermia and the use of damaging home remedies. Hudspith and Rayatt warn that cooling large areas of skin can lead to hypothermia, especially in children ^[3]. The risk is real but conditional. Singer and colleagues found that only 15 of 929 burn patients (1.6%) were hypothermic on arrival and all cases were mild, but hypothermia was present in 6 of 17 patients (35%) with a TBSA of 70% or greater versus 0.9% of those with smaller burns ^[19]. Lönnecker and Schoder found no influence of cold-water treatment alone on body temperature in non-anesthetized patients, concluding that hypothermia is not a problem of the non-anesthetized, cold-water-treated patient and is instead linked to anesthesia and ventilation ^[23]. A registered protocol by Vayada and colleagues notes that concern about hypothermia following 20 minutes of cool running water persists as a perceived barrier, and that when hypothermia does occur it has been associated with higher mortality even after controlling for burn severity ^[30]. The practical tension is between adequate cooling of the wound and preservation of core temperature, sharpest in children and large burns.

Inappropriate first aid is the second harm. O'Leary and colleagues catalogued burn first-aid misinformation including unfounded use of natural remedies, injudicious antibiotics, omission of key first-aid steps, and errors in specific details, warning that patients may present having caused further injury with insufficient first aid or inappropriate home remedies ^[28]. Bennett and colleagues documented potentially harmful first aid such as food, oil, toothpaste, shampoo, or ice applied to 5% of children in Cardiff and 10% in Denver ^[13]. A particular iatrogenic pattern is over-cooling: Werner and colleagues found that cooling with 8°C for 30 minutes after a first-degree burn in humans did not attenuate inflammatory or hyperalgesic responses compared with a control burn ^[32], and Lewis and colleagues reported thermal injury from unsupervised hot-water immersion used as marine-sting first aid, recommending that guidance be updated so patients are not advised to continue scalding immersion at home ^[33].

Outcomes¶

The outcomes attributed to good first aid are wound depth, healing time, grafting, length of stay, and ICU admission, rather than mortality. Chai and colleagues' systematic review concluded that early application of cool water irrigation may reduce length of hospital stay and the extent of scarring ^[15]. Wood and colleagues' bi-national cohort linked cooling to a 13% reduction in graft-surgery probability, a 48% reduction in ICU-admission probability, and an 18% reduction in length of stay, with a dose-response relationship for all outcomes except death ^[6]. Nguyen and colleagues' companion case series of initial management in childhood burns found that of 95 patients who received all the initial-management measures studied, all survived, with no cases of irreversible shock, acute renal failure, or multiple organ failure, and that adequate initial management was significantly protective against septicaemia ^[11].

The community-knowledge data temper these outcomes with a delivery problem. Rea and colleagues found that only 88 of 227 patients (39%) audited at a minor-burn facility had received appropriate first aid ^[34], and McCormack and colleagues found adequate initial first aid in only 22% of children ^[12]. The gap between efficacious first aid and delivered first aid is the recurring limiting factor on population-level outcome.

Controversies and Evidence Gaps¶

The single largest open question is the optimal cooling duration and temperature. The widely cited 20-minute prescription rests on cohort, animal, and human-model data rather than randomized comparison of durations. The 2022 International Liaison Committee on Resuscitation systematic review by Djärv and colleagues found no benefit for a cooling duration of 20 minutes or more compared with less than 20 minutes for the outcomes of size and depth of burn, re-epithelialization, or skin grafting, judged the evidence of very low certainty owing to limitations in study design, risk of bias, and indirectness, and concluded that the optimal duration of cooling remains unknown ^[10]. This sits in tension with the cohort and model evidence summarized above ^[4][5][6], and the divergence is not resolved.

A second gap is the inconsistency of international first-aid recommendations. Bennett and colleagues described considerable variation between international first-aid recommendations and an urgent need for internationally agreed, evidence-based burn first aid recommendations ^[13]. Allison's UK survey found wide variation in the basic approach to first aid and pre-hospital care of burns patients ^[29]. O'Leary and colleagues documented that this variation is compounded by misinformation reaching patients directly ^[28].

A third unsettled area is the boundary between beneficial cooling and harm. Concern about hypothermia remains a perceived barrier to adequate cooling, and the protocol by Vayada and colleagues exists precisely to quantify hypothermia incidence after the 20-minute intervention ^[30]. The evidence that over-cooling provides no added benefit and that ice can deepen injury ^[3][32] means the therapeutic window has both a floor and a ceiling that are imperfectly defined, particularly in children and in large burns where the hypothermia risk concentrates ^[3][19].

References¶

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